CN110039680A - Plastic waste processing system - Google Patents

Abstract

The present invention discloses a plastic waste treatment system, including a crusher, a first separation sedimentation tank, an electrostatic sorting system and a second separation sedimentation tank, wherein the crusher is used to crush the plastic waste, the output end of the crusher is connected to the first separation sedimentation tank, and the crushed plastic waste is transported to the first separation sedimentation tank; the first separation sedimentation tank performs water sorting on the crushed plastic waste through the liquid stored therein, the first separation sedimentation tank is provided with a first floating material output end and a first bottom material output end, the main component of the material outputted from the first floating material output end is PE and/or PP, the first bottom material output end is connected to the electrostatic sorting system; the electrostatic sorting system is provided with an ABS output end and a PS output end, the main component of the material outputted from the ABS output end is ABS, the main component of the material outputted from the PS output end is PS, and the PS output end is connected to the second separation sedimentation tank. It can classify the plastic waste with PE/PP, ABS, environmentally friendly PS and non-environmentally friendly PS as the main components.

Description

Plastic waste disposal system

technical field

The invention relates to a plastic waste disposal system.

Background technique

The main raw materials of plastic waste are white goods, black household appliances and other shells, which contain PS, ABS and other components. The plastic waste treatment systems in the prior art can only separate the plastic waste mixture at a basic level, that is, it is limited to the extent that the plastic waste is separated into two or three main components, PS and ABS.

For example, Chinese Patent No. 201420632798.7 relates to a waste household appliance plastic recycling and processing system, especially a waste household appliance plastic shell processing system integrating crushing, sorting, cleaning and drying. It includes a crushing system, a cleaning system and a drying system, characterized in that: the crushing system includes a shredder and a fine crusher, and the cleaning system includes a friction cleaning machine, a primary rinsing machine, a thermal cleaning machine, and a secondary rinsing machine. The drying system includes a dehydrator and a dryer. In the present invention, the plastic shells of large parts such as waste household appliances are first broken into small pieces by a primary shredder, and the irregular shell plastics are broken into small pieces by a fine shredder. , Flake or granular plastic with uniform size, after passing through the fine crusher, it is transferred to the primary rinsing machine, thermal cleaning machine and secondary rinsing machine through the friction cleaning machine for cleaning, impurity removal, sorting, and finally the separated plastic passes through the dehydrator. The whole recycling system effectively reduces the cost of manual recycling of waste household appliance plastics, increases the utilization rate of plastic raw materials, and is environmentally friendly and energy-saving. The patented solution is used to separate plastic waste into PS, ABS, PVC, etc.

With the increasing variety of materials used for the shells of white goods and black household appliances, the types of components contained in the shredded plastic waste are also gradually increasing, such as PE, PP, ABS, PS, etc. Among them, PS is divided into environmental protection PS and non-environmental protection PS . Currently. How to efficiently and continuously classify plastic waste with PE/PP, ABS, environmentally friendly PS and non-environmentally friendly PS as the main components has become an urgent problem for the industry.

SUMMARY OF THE INVENTION

In order to overcome the deficiencies of the prior art, the purpose of the present invention is to provide a plastic waste disposal system, which can classify plastic wastes with PE/PP, ABS, environmentally friendly PS and non-environmentally friendly PS as the main components.

The purpose of the present invention adopts following technical scheme to realize:

A plastic waste treatment system, including a crusher, a first separation and sedimentation tank, an electrostatic separation system and a second separation and sedimentation tank, wherein:

The crusher is used for crushing plastic waste, the output end of the crusher is connected with the first separation and sedimentation tank, and the crushed plastic waste is transported to the first separation and sedimentation tank;

The first separation and sedimentation tank conducts water separation on the crushed plastic waste through the liquid stored therein. The main component of the material output from a floating material output end is PE and/or PP, and the first sinking material output end is connected to the electrostatic separation system;

The electrostatic sorting system is provided with an ABS output end and a PS output end. The main component of the material output by the ABS output end is ABS, the main component of the material output by the PS output end is PS, and the PS output end is connected to the PS output end. The second separation sedimentation tank is connected;

The second separation and sedimentation tank conducts water separation on the materials input from the PS output end through the liquid stored therein, and the second separation and sedimentation tank is provided with a second floating water material output end and a second sinking material output end , the main component of the material output from the output end of the second floating material is environmentally friendly PS, and the main component of the material output from the output end of the second sinking material is non-environmentally friendly PS.

Specifically, a first friction washer and a first vertical dehydrator are connected between the crusher and the first separation and sedimentation tank, wherein:

The input end of the first friction cleaning machine is connected with the output end of the crusher, the first friction cleaning machine is used for cleaning materials, and the solid output end of the first friction cleaning machine is connected to the first vertical type The input end of the dehydrator is connected, the first vertical dehydrator is used for dehydrating the material, and the solid output end of the first vertical dehydrator is connected with the input end of the first separation and sedimentation tank.

Specifically, a first screw conveyor is provided at the input end of the crusher, and a second screw conveyor is provided between the first vertical dehydrator and the first separation and sedimentation tank.

Specifically, the output end of the first floating material is sequentially connected with a third screw conveyor and a second vertical dehydrator, and the second vertical dehydrator is used for dehydrating the first floating material.

Specifically, a fourth screw conveyor and a third vertical dehydrator are sequentially connected to the output end of the first sinking material, and the third vertical dehydrator is used for dehydrating the first sinking material.

Specifically, a first heating mixer is connected between the output end of the third vertical dehydrator and the electrostatic separation system, and the first heating mixer is used for heating the first bottom sink material, so that the The first settling material is dried.

Specifically, a first silica gel remover is connected between the output end of the third vertical dehydrator and the first heating mixer, and the first silica gel remover is used to remove the first bottom sink material. Silica impurities.

Specifically, the electrostatic sorting system includes a first grade A sorter and a second grade A sorter, and the respective input ends of the first grade A sorter and the second grade A sorter are both Connected to the output end of the first heating mixer, the first grade A sorter and the second grade A sorter are both equipped with PP/PE primary feeder, ABS primary feeder and PS primary Distributing trough, the PP/PE primary distributing tank is used to collect plastic waste whose main component is PP and/or PE, the ABS primary distributing tank is used to collect plastic waste whose main component is ABS, the PS primary The hopper is used to collect plastic waste whose main component is PS.

Specifically, the electrostatic sorting system includes a first B-grade sorting machine, the ABS primary hopper is connected to the input end of the first B-grade sorting machine through a conveying mechanism, and the first B-grade sorting machine is The separator is provided with a PA material distribution tank, an ABS secondary material distribution tank and a first circulating material distribution tank. The PA material distribution tank is used to collect plastic waste whose main component is PA, and the ABS secondary material distribution tank is used for The plastic waste whose main component is ABS is collected, the first circulating material trough is used to collect the remaining plastic waste output from the first B-class sorting machine, and the plastic waste processing system is provided with a first circulating conveying mechanism , the first circulating feed tank is connected with the first circulating conveying mechanism, and the output end of the first circulating conveying mechanism is connected to the first grade A sorter and the second grade A sorter respectively. input connection.

Specifically, the electrostatic separation system includes a second B-stage sorting machine, the PS primary hopper is connected to the input end of the second B-stage sorting machine through a conveying mechanism, and the second B-stage sorting machine is The separator is equipped with a PP/PE secondary distribution tank, a PS secondary distribution tank and a second circulating distribution tank. The PP/PE secondary distribution tank is used to collect plastics whose main components are PE and/or PP. Waste, the PS secondary distribution tank is used to collect plastic waste whose main component is PS, and the second circulation distribution tank is used to collect the rest of the plastic waste output from the second B-class sorting machine. The plastic waste treatment system is provided with a first circulating conveying mechanism, the second circulating distributing trough is connected with the first circulating conveying mechanism, and the output end of the first circulating conveying mechanism is connected to the first grade A sorting The respective input ends of the machine and the second grade A sorting machine are connected.

Specifically, the electrostatic sorting system includes a first grade C sorter, and the PS secondary hopper is connected to the input end of the first grade C sorter through a conveying mechanism, and the first grade C grade The sorting machine is provided with a PS terminal distribution tank, a third circulation distribution tank and a fourth circulation distribution tank. The PS terminal distribution tank is used to collect plastic waste whose main component is PS. The third circulation distribution tank The tank is connected with the first circulation conveying mechanism through a conveying mechanism, the electrostatic sorting system includes a second circulation conveying mechanism, and the output end of the second circulation conveying mechanism is connected to the first grade A sorter, the The respective input ends of the second grade A sorting machines are connected, and the fourth circulating material trough is connected with the second circulating conveying mechanism through a conveying mechanism.

Specifically, the PS terminal material distribution tank is connected to the second separation and sedimentation tank through a conveying mechanism, and the second floating material output end is sequentially connected with a fourth vertical dehydrator, a first clear water tank and a sixth vertical Dehydrator.

Specifically, the PS terminal distribution tank is connected to the second separation and sedimentation tank through a conveying mechanism, and the output end of the second sedimentation material is sequentially connected with a fifth vertical dehydrator, a second clear water tank and a seventh dehydration tank. machine.

Specifically, the liquid stored in the first separation and sedimentation tank is clean water.

Specifically, the liquid stored in the second separation and sedimentation tank is brine, and the salinity of the brine is 5%-9%.

Compared with the prior art, the beneficial effects of the present invention are:

The main components of the material output from the first floating material output end are PE and/or PP, so as to preliminarily separate PE and/or PP.

The electrostatic separation system is provided with an ABS output end and a PS output end, and the main component of the material output from the ABS output end is ABS, so as to separate the ABS. The main component of the material output from the PS output end is PS, so as to preliminarily separate the PS.

The PS output end is connected with the second separation and sedimentation tank, and the second separation and sedimentation tank conducts water separation on the material input from the PS output end through the liquid stored therein, and the second separation and sedimentation tank is provided with There are a second floating water material output end and a second sinking material output end, the main component of the material output by the second floating water material output end is environmental protection PS, and the main component of the material output by the second sinking material output end is Non-environmental-friendly PS, thereby further separating PS into environmental-friendly PS and non-environmental-friendly PS.

Description of drawings

Figure 1 is a general schematic diagram of a plastic waste treatment system;

Figure 2 is a partial view of part A of the plastic waste treatment system;

Figure 3 is a partial view of part B of the plastic waste treatment system;

Figure 4 is a partial view of part C of the plastic waste treatment system;

Figure 5 is a partial view of part D of the plastic waste treatment system;

Figure 6 is a top view of the plastic waste treatment system;

FIG. 7 is a schematic diagram of the electrostatic sorting system in the plastic waste processing system.

In the figure: 1, crusher; 21, the first separation sedimentation tank; 22, the second separation sedimentation tank; 31, the first friction cleaning machine; 41, the first vertical dehydrator; 42, the second vertical dehydrator; 43, the third vertical dehydrator; 44, the fourth vertical dehydrator; 45, the fifth vertical dehydrator; 46, the sixth vertical dehydrator; 47, the seventh vertical dehydrator; 51, the first silica gel Removal machine; 52, second silica gel removal machine; 53, third silica gel removal machine; 61, first heating mixer; 62, second heating mixer; 71, first grade A sorter; 72, second grade A Sorting machine; 701, PP/PE primary feeder; 702, ABS primary feeder; 703, PS primary feeder; 73, First Class B sorter; 731, PA feeder; 732, ABS secondary 733. The first circulating feeding trough; 74. The first circulating conveying mechanism; 75. The second B-class sorting machine; 751, PP/PE secondary feeding trough; 752, PS secondary feeding tank; 753, the second circulation distribution tank; 76, the first C-class sorting machine; 761, PS terminal distribution tank; 762, the third circulation distribution tank; 763, the fourth circulation distribution tank; 77, the first Second circulating conveying mechanism; 81, third screw conveyor; 82, fourth screw conveyor; 83, seventh screw conveyor; 84, eighth screw conveyor; 85, second screw conveyor; 86, sixth screw Conveyor; 87, the first screw conveyor; 88, the fifth screw conveyor; 91, the second Z-type wind separator; 92, the first Z-type wind separator; 101, the first clear water tank; Clear water pool; 111, the first storage bin; 112, the second storage bin.

Detailed ways

The present invention will be further described below with reference to the accompanying drawings and specific embodiments. It should be noted that, on the premise of no conflict, the embodiments or technical features described below can be combined arbitrarily to form new embodiments. .

1 to 5, the plastic waste treatment system includes a crusher 1, a first separation and sedimentation tank 21, an electrostatic separation system and a second separation and sedimentation tank 22, wherein:

The shredder 1 is used for shredding the plastic waste. Specifically, the plastic waste to be sorted comes from the plastic casings of electrical appliances such as white goods and black household appliances, such as the plastic casing of a computer monitor, the plastic casing of a washing machine, and the plastic casing of the plastic waste to be sorted. The ingredients mainly include PA, ABS, PS, PP and PE. The crusher 1 is used for crushing the plastic shell to form plastic particles, small pieces or pieces with a size of 15mm-25mm. The output end of the crusher 1 is connected to the first separation and sedimentation tank 21 , and the crushed plastic waste is transported to the first separation and sedimentation tank 21 .

The first separation and sedimentation tank 21 conducts water separation on the crushed plastic waste through the liquid stored therein. Specifically, the liquid stored in the first separation and sedimentation tank 21 is pure water. The density of water is 1 or close to 1, not specifically how "clear, clean" the water is. The first separation and sedimentation tank 21 is provided with a first floating water material output end and a first sinking material output end. Affected by the buoyancy of the purified water stored in the first separation and sedimentation tank 21, the main components are PE (density of 0.95) and/or PP (density of 0.92) floating on the water surface of the first separation and sedimentation tank 21, and the rest of the plastic particles are under the buoyancy. Shen. Therefore, the main components of the material output from the first floating material output end are PE and/or PP. The output end of the first bottom sink material is connected to the electrostatic separation system. Since the first separation and sedimentation tank 21 does not flotate all the materials containing PE and/or PP in the material during the sorting process, the first bottom sink The material is a mixture of plastics containing PA, ABS, PS, PP and PE.

The electrostatic separation system is provided with ABS output end and PS output end. The main component of the material output by the ABS output end is ABS, and the main component of the material output by the PS output end is PS. The PS output end is connected to the second separation and sedimentation tank 22, and the second separation and sedimentation tank 22 further sorts the received materials, that is, the second separation and sedimentation tank 22 uses the liquid stored in the second separation and sedimentation tank 22 to process the material input through the PS output end. In water selection, specifically, the liquid stored in the second separation and sedimentation tank 22 is brine, and the salinity of the brine is 5%-9%. In this embodiment, the salinity of the brine is 7%. The second separation and sedimentation tank 22 is provided with a second floating water material output end and a second bottoming material output end. The density of environmentally friendly PS is lower than that of the brine, and the density of non-environmental PS is higher than that of the brine. Therefore, the main component of the material output from the output end of the second floating material is environmentally friendly PS, and the main component of the material output from the output end of the second sinking material is the main component For non-environmental PS.

Specifically, a first friction washer 31 and a first vertical dehydrator 41 are connected between the crusher 1 and the first separation and sedimentation tank 21, wherein:

The input end of the first friction cleaning machine 31 is connected with the output end of the crusher 1. The friction cleaning machine is used for cleaning materials. material to generate friction between the stirring blade and the material, and between the material and the material, so as to clean the material.

The solid output end of the first friction washer 31 is connected to the input end of the first vertical dehydrator 41 . The vertical dewatering machine is used to dehydrate the material. The principle is: after the material enters the vertical dewatering machine, it is pushed and stirred by the screw blades of the main shaft, and the material is rubbed inside the screen, causing some impurities and stolen goods (such as small sand and gravel, etc.). The fine material) is separated by friction, and then thrown out through the screen mesh under the action of water and centrifugal force, and the remaining material to be treated is discharged from the outlet, and the dehydration efficiency of the remaining material to be treated is not less than 98%. The solid output end of the first vertical dehydrator 41 is connected to the input end of the first separation and sedimentation tank 21 . Specifically, the input end of the crusher 1 is provided with a first screw conveyor 87 . A second screw conveyor 85 is provided between the first vertical dehydrator 41 and the first separation and sedimentation tank 21 .

Specifically, the output end of the first floating material is sequentially connected with a third screw conveyor 81 and a second vertical dehydrator 42, and the second vertical dehydrator 42 is used for dehydrating the first floating material. Preferably, the output end of the second vertical dehydrator 42 is connected with a first Z-type air separator 92, and the first Z-type air separator 92 is used to remove impurities such as dust and labels in the first floating material.

Specifically, a fourth screw conveyor 82 and a third vertical dehydrator 43 are sequentially connected to the output end of the first sinking material. The third vertical dehydrator 43 is used for dehydrating the first bottom material. A first heating mixer 61 is connected between the output end of the third vertical dehydrator 43 and the electrostatic separation system. The first heating agitator 61 is used for heating the first bottom sink material to dry the first bottom sink material, so that the first bottom sink material can be better triboelectrically generated in the subsequent electrostatic separation process. Preferably, a first silica gel remover 51 is connected between the output end of the third vertical dehydrator 43 and the first heating mixer 61 , and the first silica gel remover 51 is used to remove silica gel impurities in the first sinking material. As a further preference, a second Z-type air separator 91 is connected between the first silica gel removal machine 51 and the third vertical dehydrator 43, and the second Z-type air separator 91 is used to remove the dust in the first sinking material. and labels and other impurities. As a further preference, the output end of the first heating mixer 61 is connected with a second heating mixer 62, and the second heating mixer 62 is used in conjunction with the first heating mixer 61, that is, the first heating mixer 61 preheats the material first, and the second heating mixer 61 preheats the material. The agitator 62 further heats the material so that the material can be dried more fully and thoroughly, so that the electric charge is generated by friction in the sorting machine in the subsequent electrostatic sorting system (in FIG. 6, due to the first heating of the agitator 61 and the second heating mixer 62 are arranged in the vertical direction, so only one heating mixer is shown in FIG. 6 ). The output end of the second heating mixer 62 is connected with the fifth screw conveyor 88, and the output end of the fifth screw conveyor 88 is connected with the input end of the electrostatic separation system. In this implementation, a first storage bin 111 is connected between the second Z-type air separator 91 and the first silica gel removal machine 51 . The first storage bin 111 is used to temporarily store materials, and the first storage bin 111 can After a sufficient amount of material is temporarily stored, the material is transported to the first silica gel removing machine 51 connected to it, so that the subsequent electrostatic separation process can be carried out continuously and effectively.

4 , 6 and 7 , the electrostatic sorting system includes a first grade A sorter 71 , a second grade A sorter 72 , a first grade A sorter 71 and a second grade A sorter 72 The respective input ends are connected to the output end of the fifth screw conveyor 88 . It should be noted that specific parameters such as "electrode polarity" and "electric field strength" of each sorting machine in the electrostatic sorting system are different, and can be set according to the plastic components that the sorting machine expects to obtain. , Of course, it is expected that a certain plastic component obtained by sorting refers to the "enrichment of this component", rather than being absolutely 100% composed of this component.

The first grade A sorter 71 and the second grade A sorter 72 are each provided with three feed troughs, namely PP/PE primary feed trough 701 , ABS primary feed trough 702 and PS primary feed trough 703 . The PP/PE primary distributing chute 701 is used to collect plastic wastes whose main components are PP and/or PE. The PP/PE primary distributing chute 701 passes through the discharge conveying mechanism (the discharge conveying mechanism is a peripheral device, independent of the sorting machine, the same below), the collected materials are output to the electrostatic separation system (along the direction A1 in FIG. 7 ), and collected at the PP/PE first collection place 781 . The ABS primary distributing chute 702 is used to collect plastic waste whose main component is ABS. The PS primary distributing tank 703 is used to collect plastic waste whose main component is PS.

Specifically, the electrostatic sorting system includes a first B-class sorting machine 73, and the ABS primary distributing tank 702 is connected to the input end of the first B-stage sorting machine 73 through a discharge conveying mechanism. The respective ABS primary hoppers 702 of the first grade A sorter 71 and the second grade A sorter 72 convey the plastic waste whose main component is ABS to the first grade B sorter 73 (along the direction of the discharge conveying mechanism). Direction A2 in Figure 7).

The first B-class separator 73 is provided with a PA material distribution tank 731 , an ABS secondary material distribution tank 732 and a first circulating material distribution tank 733 . The PA distributing tank 731 is used to collect the plastic waste whose main component is PA. The PA distributing tank 731 outputs the collected materials to the electrostatic sorting system through the discharge conveying mechanism, and collects them at the PA collection place 782 (along the direction shown in FIG. 7 ). direction B1).

The ABS secondary distribution tank 732 is used to collect plastic waste whose main component is ABS. The ABS secondary distribution tank 732 outputs the collected materials to the electrostatic sorting system through the discharge conveying mechanism, and further conveys the collected materials to the second silica gel for removal. The machine 52 (along the direction B2 in FIG. 7 ), the second silica gel removing machine 52 is used for removing silica gel impurities in the plastic waste whose main component is ABS. The first circulating distribution tank 733 is used to collect the remaining plastic waste output from the first B-class sorting machine 73 .

The electrostatic separation system is provided with a first circulating conveying mechanism 74, and the first circulating distributing trough 733 is connected with the first circulating conveying mechanism 74 through the discharging conveying mechanism (the material flow direction of the first circulating distributing tank 733 is in the direction shown in Fig. 7 . direction B3). The output end (M in FIG. 7 ) of the first circulating conveying mechanism 74 is connected to the respective input ends of the first grade A sorter 71 and the second grade A sorter 72 . It should be noted that the figure is only for illustration, and does not actually show the connection state between the output end of the first circulating conveying mechanism 74 and the respective input ends of the first grade A sorter 71 and the second grade A sorter 72 .

Specifically, the electrostatic sorting system includes a second B-grade sorter 75 and a first C-grade sorter 76 . The PS primary distributing chute 703 is connected to the input end of the second B-stage sorting machine 75 through the discharge conveying mechanism (along the direction A1 in FIG. 7 ). The second B-class separator 75 is provided with a PP/PE secondary distribution tank 751 , a PS secondary distribution tank 752 and a second circulation distribution tank 753 . The PP/PE secondary distributing chute 751 is used to collect plastic wastes whose main components are PE and/or PP. And it is collected at the PP/PE second collection place 783 (the material discharged from the PP/PE secondary distribution tank 751 flows in the direction C1 in FIG. 7 ). The PS secondary distribution tank 752 is used to collect the plastic waste whose main component is PS, and the PS secondary distribution tank 752 outputs the collected materials to the first C-level sorting machine 76 through the discharge conveying mechanism (PS secondary sorting machine 76). The flow direction of the material discharged from the trough 752 is the direction C2 in FIG. 7 ). The second circulating distribution tank 753 is used to collect the remaining plastic waste output from the second B-class sorting machine 75 . The second circulating material trough 753 is connected to the first circulating conveying mechanism 74 through the discharge conveying mechanism (the flow direction of the material discharged from the second circulating material trough 753 is the direction C3 in FIG. 7 ).

The first C-class separator 76 is provided with a PS terminal distribution tank 761 , a third circulation distribution tank 762 and a fourth circulation distribution tank 763 . The PS terminal distributing tank 761 is used to collect plastic wastes whose main component is PS. The PS terminal distributing tank 761 outputs the collected materials to the electrostatic sorting system through the discharge conveying mechanism, and then enters the third silica gel removal machine 53 (the flow direction of the material discharged from the PS terminal distribution tank 761 is the direction D1 in Figure 7). The third circulation distribution tank 762 is connected to the first circulation conveyance mechanism 74 through the discharge conveying mechanism (the flow direction of the material discharged from the third circulation distribution tank 762 is the direction D2 in FIG. 7 ).

The electrostatic sorting system includes a second circulating conveying mechanism 77 , the output end of the second circulating conveying mechanism 77 (at N in FIG. 7 ) and the respective input ends of the first grade A sorter 71 and the second grade A sorter 72 Connection, it should be noted that the figure is only for illustration, and does not actually show the connection state between the output end of the second circulating conveying mechanism 77 and the respective input ends of the first grade A sorter 71 and the second grade A sorter 72 . The fourth circulating distributing tank 763 is connected to the second circulating conveying mechanism 77 through the discharge conveying mechanism (the flow direction of the material discharged from the fourth circulating distributing tank 763 is the direction D3 in FIG. 7 ).

The electrostatic sorting system has a grade A sorter, a grade B sorter and a grade C sorter. The Class A sorter is used for primary selection, and part of the miscellaneous materials (PP/PE) with higher enrichment are discharged, and the rest of the miscellaneous materials enter the first Class B sorter 73 and the second Class B sorter 75 for processing further sorting. Then, the first B-stage sorter 73 discharges part of the impurities (PA) with a higher degree of enrichment, and the second B-stage sorter 75 discharges part of the impurities with a higher degree of enrichment (PP/PE). Then, the second B-stage sorter 75 inputs part of the remaining miscellaneous materials to the first C-stage sorter 76, and the first C-stage sorter 76 discharges part of the miscellaneous materials (PS) with a higher degree of enrichment.

After the materials are sorted in three stages, the corresponding miscellaneous materials can be sorted in the corresponding sorting machine in a more targeted manner.

In addition, the electrostatic separation system includes a first circulating conveying mechanism 74 and a second circulating conveying mechanism 77 . Both the first circulating material trough 733 and the second circulating material trough 753 are connected to the first circulating conveying mechanism 74 through a discharge output mechanism. The fourth circulating material trough 763 is connected with the second circulating conveying mechanism 77 through the discharging conveying mechanism. Therefore, the materials that have not been screened out by specific materials in the first B-stage sorter 73 and the second B-stage sorter 75 can be conveyed to the A-stage sorter again through the first circulating conveying mechanism 74. Similarly, in the Materials that are not screened out by specific materials in the first C-class sorting machine 76 can be transported to the A-stage sorting machine again through the second circulating conveying mechanism 77 for sorting again. Through cyclic sorting, the sorting accuracy is improved.

It should be noted that the first grade A sorter 71 , the second grade A sorter 72 , the first grade B sorter 73 , the second grade B sorter 75 and the first grade C sorter 76 are all There is a friction channel, a conveyor belt and a sorting electrode. There is a rotating shaft in the friction channel. The rotating shaft is equipped with a number of stirring blades. The stirring blades are used to stir the materials, so that the materials rub against each other and have charges. The materials output through the friction channel fall. into the conveyor belt, and the sorting electrode is arranged at the output of the conveyor belt.

It should be noted that the above-mentioned discharging conveying mechanism is a vibrating conveyor. The first circulating conveying mechanism 74 is a vibrating conveyor. The second circulating conveying mechanism 77 is a vibrating conveyor.

A second storage bin 112 is connected to the output end of the third silica gel removal machine 53 (the input material is plastic waste whose main component is PS), and the second storage bin 112 collects plastic waste whose main component is PS (including environmentally friendly PS). and non-environmentally friendly PS). The output end of the second storage bin 112 is connected with the sixth screw conveyor 86 , and the output end of the sixth screw conveyor 86 is connected with the second separation sedimentation tank 22 .

The plastic waste treatment system includes a first plastic waste treatment water circulation system. The first plastic waste treatment water circulation system includes a crusher 1 , a first friction washer 31 , a first vertical dehydrator 41 , and a first separation sedimentation tank 21 . The solid output end of the crusher 1 is connected to the first friction washer 31, the solid output end of the first friction washer 31 is connected to the first vertical dehydrator 41, and the solid output end of the first vertical dehydrator 41 is connected to the first vertical dehydrator 41. The separation and sedimentation tank 21 is connected. The first separation and sedimentation tank 21 is provided with a first floating water material output end and a first sinking material output end. The first floating water material output end is sequentially connected with a third screw conveyor 81, a second vertical dehydration Machine 42, the output end of the first sinking material is connected with a fourth screw conveyor 82 and a third vertical dehydrator 43 in sequence. The first plastic waste treatment water circulation system includes a first vibrating screen, a reaction device, a water treatment sedimentation tank, and an air flotation tank. The liquid output end of the first vibrating screen is connected with the reaction device, and the liquid output end of the reaction device is connected with the water treatment sedimentation tank. The liquid output end of the water treatment sedimentation tank is connected with the air flotation tank, and the liquid output end of the air flotation tank is connected with a second water storage tank. The liquid circulation structure of the first plastic waste treatment water circulation system is as follows:

The respective liquid output ends of the first friction washer 31 and the first vertical dehydrator 41 are connected to the input end of the first vibrating screen;

The output end of the second water storage tank is connected to the liquid input end of the first separation and sedimentation tank 21;

The respective liquid output ends of the third screw conveyor 81 , the fourth screw conveyor 82 , the second vertical dehydrator 42 and the third vertical dehydrator 43 are connected to the crusher 1 , the first friction washer 31 and the The respective liquid input ends of the first vertical dehydrator 41 are connected.

Specifically, the input end of the first vibrating screen is connected with the first belt cutting submersible pump, and the respective output ends of the first friction washer 31 and the first vertical dehydrator 41 are connected with the first belt cutting submersible pump.

Specifically, the output end of the first vibrating screen is connected with a first water storage tank, and a first vertical submersible sewage pump is connected between the first water storage tank and the reaction device. Specifically, the first plastic waste treatment water circulation system includes a PAC dosing device and a PAM dosing device. The respective output ends of the PAC dosing device and the PAM dosing device are connected to the reaction device. Both PAM and PAC are flocculants. In the treatment sedimentation tank, the flocs formed by PAM and PAC make the colloids and insoluble particles in the sewage adhere to it, so as to agglomerate the colloids and insoluble particles.

Specifically, the first plastic waste treatment water circulation system includes a mud storage tank, and the respective output ends of the water treatment sedimentation tank and the air flotation tank are connected to the mud storage tank. After the liquid in the water treatment sedimentation tank is transported to the air flotation tank, the bottom of the air flotation tank releases tiny bubbles, and the bubbles adhere to the above-mentioned flocs (the flocs adhere to colloids and insoluble particles), making the flocs buoyant. It grows and floats up to the surface of the flotation pool. Then, the flocs floating on the surface of the air flotation tank can be transferred to the mud storage tank to complete the removal of colloids and insoluble particles from the sewage. The remaining liquid in the air flotation tank is relatively clean and can be transported to the first separation and sedimentation tank 21 for sorting.

Specifically, the output end of the mud storage tank is connected to a diaphragm pump, the output end of the diaphragm pump is connected to a plate-and-frame filter press, and the liquid output end of the plate-and-frame filter press is connected to the second water storage tank.

Specifically, the first plastic waste treatment water circulation system includes a second vertical submersible sewage pump, the input end of the second vertical submersible sewage pump is connected to the second water storage tank, and the output end of the second vertical submersible sewage pump is connected to the first submersible sewage pump. The separation sedimentation tank 21 is connected.

Specifically, the first plastic waste treatment water circulation system includes a second screw conveyor 85. The solid input end of the second screw conveyor 85 is connected to the solid output end of the first vertical dehydrator 41, and the solid output end of the second screw conveyor 85 is connected. The end is connected to the solid input end of the first separation and sedimentation tank 21 .

Specifically, the first plastic waste treatment water circulation system includes the second belt cutting submersible pump, the third screw conveyor 81 , the fourth screw conveyor 82 , the second vertical dehydrator 42 and the third vertical dehydrator 43 . The respective liquid output ends are all connected with the input end of the second submersible pump with cutting. The respective liquid input ends of the crusher 1 , the first friction washer 31 , the first vertical dehydrator 41 and the second screw conveyor 85 are all connected to the second belt cutting submersible pump.

Specifically, the first plastic waste treatment water circulation system includes a first screw conveyor 87, the input end of the first belt cutting submersible pump is connected to the liquid output end of the first screw conveyor 87, and the solid output end of the first screw conveyor 87 Connected to the crusher 1, the input end of the first screw conveyor 87 is used to receive materials.

Specifically, the first vibrating screen is a first circular vibrating screen.

Specifically, the water treatment sedimentation tank is an inclined plate sedimentation tank.

The liquid discharged from the friction cleaning of the material by the first friction cleaning machine 31 and the liquid discharged from the dehydration of the material by the first vertical dehydrator 41 are sent to the first vibrating screen, and the first vibrating screen filters and removes the liquid. After the impurities are removed, the liquid is input to the reaction device for further processing, so that the impurities in the liquid are further precipitated and separated to form clean water, and the clean water enters the second water storage tank for storage. The output end of the second water storage tank is connected to the liquid input end of the first separation and sedimentation tank 21 for supplementing the liquid stored in the first separation and sedimentation tank 21 .

The liquids discharged from each of the third screw conveyor 81 , the fourth screw conveyor 82 , the second vertical dehydrator 42 and the third vertical dehydrator 43 originate from the discharge from the first separation sedimentation tank 21 . The liquids discharged at the same time, and the liquids discharged from each of the above four are transported to the crusher 1, the first friction washer 31 and the first vertical dehydrator 41 for preliminary cleaning of the materials entering the plastic waste treatment system.

In this way, the sewage after the materials are cleaned by the crusher 1, the first friction washer 31 and the first vertical dehydrator 41 are separated and precipitated after being filtered and removed to form clean water, which is then transported to the first separation and sedimentation tank 21, for material sorting. After the first separation and sedimentation tank 21 is discharged, the liquid discharged by the third screw conveyor 81, the fourth screw conveyor 82, the second vertical dehydrator 42 and the third vertical dehydrator 43 is re-input to the crusher 1, the first friction washer 31 and the first vertical dehydrator 41 for cleaning materials.

The sewage discharged from the crusher 1 , the first friction washer 31 and the first vertical dewatering machine 41 is transported to the first vibrating screen, the reaction device, etc. for decontamination and purification to form clean water. Then, the clean water is transported to the first separation and sedimentation tank 21 for material sorting. The first separation and sedimentation tank 21 is sorted and then discharged to the third screw conveyor 81, the fourth screw conveyor 82, the second vertical dehydrator 42 and the third vertical dehydrator 43, the third screw conveyor 81, the third The liquid discharged from the four-screw conveyor 82 , the second vertical dehydrator 42 and the third vertical dehydrator 43 during operation is “secondary clean water”, and the cleanliness of the “secondary clean water” is higher than that of the clean water in the first separation and sedimentation tank 21 The cleanliness is low, so the "secondary clean water" is sent to the crusher 1, the first friction washer 31 and the first vertical dehydrator 41 to clean the materials that first entered the plastic waste treatment system. The plastic waste treatment water circulation system of the present invention realizes the circulation of sewage, clean water and "secondary clean water" in three water clean states, so that the water application of the water circulation system forms a self-circulation, thereby reducing the discharge of sewage and realizing environmental protection and energy saving.

The plastic waste treatment system includes a second plastic waste treatment water circulation system, the second plastic waste treatment water circulation system includes a second separation sedimentation tank 22, and the second separation sedimentation tank 22 is provided with a second floating water output end and a second sinking material output end . The output end of the second floating material is connected with the seventh screw conveyor 83 and the fourth vertical dehydrator 44 in sequence. The output end of the second sinking material is sequentially connected with the eighth screw conveyor 84 and the fifth vertical dehydrator 45 . The second plastic waste treatment water circulation system includes a second vibrating screen and a third water storage tank. The liquid output end of the second vibrating screen is connected to the third water storage tank. The liquid circulation structure of the second plastic waste treatment water circulation system is as follows:

The liquid output ends of the seventh screw conveyor 83, the fourth vertical dehydrator 44, the eighth screw conveyor 84 and the fifth vertical dehydrator 45 are all connected to the second vibrating screen;

The third water storage tank is connected to the liquid input end of the second separation sedimentation tank 22 .

Specifically, the second plastic waste treatment water circulation system includes a third submersible pump with cutting, and the output end of the third submersible pump with cutting is connected to the second vibrating screen. The liquid output ends of the seventh screw conveyor 83 , the fourth vertical dehydrator 44 , the eighth screw conveyor 84 and the fifth vertical dehydrator 45 are all connected to the third belt cutting submersible pump.

Specifically, the second plastic waste treatment water circulation system includes a third vertical submersible sewage pump, the output end of the third water storage tank is connected to the third vertical submersible sewage pump, and the output end of the third vertical submersible sewage pump is connected to the second vertical submersible sewage pump. The liquid input end of the separation sedimentation tank 22 is connected.

Specifically, the second plastic waste treatment water circulation system includes a first clean water tank 101 and a sixth vertical dehydrator 46 . The solid output end of the fourth vertical dehydrator 44 is connected to the first clean water tank 101 . The solids output is connected to the sixth vertical dehydrator 46 .

Specifically, the second plastic waste treatment water circulation system includes a third vibrating screen, and the respective liquid output ends of the first clear water tank 101 and the sixth vertical dehydrator 46 are connected to the third vibrating screen.

Specifically, the second plastic waste treatment water circulation system includes a fourth submersible pump with cutting, and the respective liquid output ends of the first clear water tank 101 and the sixth vertical dehydrator 46 are connected to the fourth submersible pump with cutting, and the fourth belt cutting The output end of the submersible pump is connected with the third vibrating screen.

Specifically, the second plastic waste treatment water circulation system includes a fourth water storage tank, the input end of the fourth water storage tank is connected to the liquid output end of the third vibrating screen, and the output end of the fourth water storage tank is connected to the first clean water tank 101 connect.

Specifically, the second plastic waste treatment water circulation system includes a fourth vertical submersible sewage pump, the output end of the fourth water storage tank is connected to the fourth vertical submersible sewage pump, and the output end of the fourth vertical submersible sewage pump is connected to the first submersible sewage pump. The clear water pool 101 is connected.

Specifically, the second plastic waste treatment water circulation system includes a second clear water tank 102 and a seventh vertical dehydrator 47 . The solid output end of the fifth vertical dehydrator 45 is connected to the second clean water tank 102 , and the solid output end of the second clean water tank 102 is connected to the seventh vertical dehydrator 47 .

Specifically, the respective liquid output ends of the second clean water tank 102 and the seventh vertical dehydrator 47 are connected to the third vibrating screen.

Specifically, the second plastic waste treatment water circulation system includes a fifth belt cutting submersible pump, and the respective liquid output ends of the second clear water tank 102 and the seventh vertical dehydrator 47 are connected to the fifth belt cutting submersible pump, and the fifth belt cutting submersible pump is connected to the fifth belt cutting submersible pump. The output end of the submersible pump is connected with the third vibrating screen.

Specifically, the input end of the fourth water storage tank is connected to the liquid output end of the third vibrating screen, and the output end of the fourth water storage tank is connected to the second clean water tank 102 .

Specifically, the output end of the fourth water storage tank is connected to the fourth vertical submersible sewage pump, and the output end of the fourth vertical submersible sewage pump is connected to the second clean water tank 102 .

Specifically, the second vibrating screen is a second circular vibrating screen.

The working principle of the second plastic waste treatment water circulation system: the respective liquid output ends of the seventh screw conveyor 83, the fourth vertical dehydrator 44, the eighth screw conveyor 84 and the fifth vertical dehydrator 45 are connected to The second shaker is connected. The third water storage tank is connected to the liquid input end of the second separation sedimentation tank 22 . The second separation and sedimentation tank 22 is sorted and discharged: the second floating material is transported to the fourth vertical dehydrator 44 through the seventh screw conveyor 83, and the second bottoming material is transported to the fifth vertical dehydrator through the eighth screw conveyor 84. Type dehydrator 45. During the process of inputting the second floating material to the seventh screw conveyor 83 and inputting the second sinking material to the eighth screw conveyor 84, part of the liquid stored in the second separation and sedimentation tank 22 will enter the seventh screw conveyor 83 and the eighth screw conveyor 84, so the seventh screw conveyor 83 and the eighth screw conveyor 84 will discharge liquid in the process of conveying materials. The fourth vertical dehydrator 44 and the fifth vertical dehydrator 45 also discharge liquid during the process of shaking and dehydrating the material. The liquid discharged from the seventh screw conveyor 83 and the eighth screw conveyor 84 and the liquid discharged from the fourth vertical dehydrator 44 and the fifth vertical dehydrator 45 are all transported to the second vibrating screen for impurity removal. , and then transported to the third storage tank for storage. After the liquid stored in the third water storage tank is supplemented with chemicals, the liquid that can be used by the second separation sedimentation tank 22 is formed, that is, salt water. The liquid stored in the third water storage tank is transported to the second separation sedimentation tank 22 for material sorting.

In the plastic waste treatment water circulation system, the liquid generated during the operation of the seventh screw conveyor 83, the fourth vertical dehydrator 44, the eighth screw conveyor 84 and the fifth vertical dehydrator 45 is transported to the second vibration screen for impurity removal, and then be transported to the third water storage tank for storage, so that the seventh screw conveyor 83, the fourth vertical dehydrator 44, the eighth screw conveyor 84 and the fifth vertical dehydrator can be transported 45 The liquid produced in the working process is recycled to avoid direct discharge, thereby reducing the waste of water resources. After adding chemicals to the third water storage tank, the liquid stored in the third water storage tank can be used by the second separation sedimentation tank 22, so as to realize the recycling of water, reduce the demand for new municipal water, and thus reduce the consumption of water resources , which is conducive to environmental protection and energy saving.

For the function or working principle of the above-mentioned crusher, reference may be made to patent documents 201610641070.4, CN104971811B, CN206296027U, CN206296028U, CN106423466A;

For the function or working principle of the above friction cleaning machine, please refer to the patent documents CN108357021A, CN103418570A, CN205650554U;

For the function or working principle of the above-mentioned separation and sedimentation tank, reference can be made to patent documents CN207841832U, CN107718367A, CN207240602U, CN207240599U;

The function or working principle of the above-mentioned vertical dehydrator can refer to patent document CN207065999U;

The function or working principle of the above-mentioned silica gel removal machine can refer to the patent document CN201621262376;

For the function or working principle of the above-mentioned heating mixer, reference may be made to patent documents CN205980650U, CN204320143U, CN106288705A;

For the functions or working principles of the above-mentioned Class A sorter, Class B sorter, and Class C sorter, you can refer to patent documents CN208004155U, CN1326381A, CN202498038U;

For the function or working principle of the above-mentioned Z-type wind separator, please refer to the patent documents CN203494791U, CN208466512U, CN106423865A, CN205914396U, CN203061434U;

For the function or working principle of the above-mentioned screw conveyor, reference may be made to the patent documents CN207312679U, CN208070688U and CN207450942U.

Patent documents disclose parts, elements, components or devices related to the invention of the present invention, therefore, the structural relationship, positional relationship, force relationship, motion relationship, energy relationship between the parts, elements and components that are not mentioned in this document , momentum relationship, etc. can be understood with reference to the above-cited patent documents. The technical content of the patent documents cited herein thus becomes part of the present patent application. If necessary, all published patent documents in the technical field to which the present invention relates may provide prior art references to this patent application.

The above-mentioned embodiments are only preferred embodiments of the present invention, and cannot be used to limit the scope of protection of the present invention. Any insubstantial changes and substitutions made by those skilled in the art on the basis of the present invention belong to the scope of the present invention. Scope of protection claimed.

Claims (15)

1. The plastic waste treatment system is characterized in that: comprising a crusher, a first separation sedimentation tank, an electrostatic sorting system and a second separation sedimentation tank, wherein: The crusher is used for crushing plastic waste, the output end of the crusher is connected with the first separation and sedimentation tank, and the crushed plastic waste is transported to the first separation and sedimentation tank; The first separation and sedimentation tank conducts water separation on the crushed plastic waste through the liquid stored therein. The main component of the material output from a floating material output end is PE and/or PP, and the first sinking material output end is connected to the electrostatic separation system; The electrostatic sorting system is provided with an ABS output end and a PS output end. The main component of the material output by the ABS output end is ABS, the main component of the material output by the PS output end is PS, and the PS output end is connected to the PS output end. The second separation sedimentation tank is connected; The second separation and sedimentation tank conducts water separation on the materials input from the PS output end through the liquid stored therein, and the second separation and sedimentation tank is provided with a second floating water material output end and a second sinking material output end , the main component of the material output from the output end of the second floating material is environmentally friendly PS, and the main component of the material output from the output end of the second sinking material is non-environmentally friendly PS. 2. The plastic waste treatment system according to claim 1, wherein a first friction washer and a first vertical dehydrator are connected between the crusher and the first separation and sedimentation tank, wherein: The input end of the first friction cleaning machine is connected with the output end of the crusher, the first friction cleaning machine is used for cleaning materials, and the solid output end of the first friction cleaning machine is connected to the first vertical type The input end of the dehydrator is connected, the first vertical dehydrator is used for dehydrating the material, and the solid output end of the first vertical dehydrator is connected with the input end of the first separation and sedimentation tank. 3. The plastic waste processing system according to claim 2, wherein the input end of the crusher is provided with a first screw conveyor, and between the first vertical dehydrator and the first separation sedimentation tank A second screw conveyor is provided. 4 . The plastic waste disposal system according to claim 1 , wherein the first floating material output end is sequentially connected with a third screw conveyor and a second vertical dehydrator, and the second vertical dehydrator is connected in sequence. 5 . For dehydrating the first floating material. 5 . The plastic waste disposal system according to claim 1 , wherein a fourth screw conveyor and a third vertical dehydrator are sequentially connected to the output end of the first sinking material, and the third vertical dehydrator is connected in sequence. 6 . The machine is used to dehydrate the first bottom sink material. 6 . The plastic waste processing system according to claim 5 , wherein a first heating mixer is connected between the output end of the third vertical dehydrator and the electrostatic sorting system, and the first heating The mixer is used for heating the first bottom sink material to dry the first bottom sink material. 7 . The plastic waste disposal system according to claim 6 , wherein a first silica gel remover is connected between the output end of the third vertical dehydrator and the first heating mixer, and the first The silica gel remover is used to remove silica-based impurities in the first sedimentation material. 8. The plastic waste processing system according to claim 6 or 7, wherein the electrostatic sorting system comprises a first grade A sorter and a second grade A sorter, and the first grade A sorter The respective input ends of the separator and the second grade A sorter are connected to the output end of the first heating mixer, and the first grade A sorter and the second grade A sorter are both set. There are PP/PE primary distributor, ABS primary distributor and PS primary distributor. The PP/PE primary distributor is used to collect plastic waste whose main components are PP and/or PE. The ABS primary distributor The trough is used for collecting plastic waste whose main component is ABS, and the PS primary distributing trough is used for collecting plastic waste whose main component is PS. 9 . The plastic waste processing system according to claim 8 , wherein the electrostatic sorting system comprises a first B-class sorting machine, and the ABS primary hopper is connected to the first B-class sorting machine through a conveying mechanism. 10 . The input end of the sorting machine is connected, and the first B-class sorting machine is provided with a PA material distribution tank, an ABS secondary material distribution tank and a first circulating material distribution tank. The PA material distribution tank is used to collect the main components of PA plastic waste, the ABS secondary distribution tank is used to collect plastic waste whose main component is ABS, and the first circulating distribution tank is used to collect the rest of the plastic output from the first B-class sorting machine. waste, the plastic waste treatment system is provided with a first circulating conveying mechanism, the first circulating feeding chute is connected with the first circulating conveying mechanism, and the output end of the first circulating conveying mechanism is connected with the first The respective input ends of the grade sorter and the second grade A sorter are connected. 10 . The plastic waste processing system according to claim 8 , wherein the electrostatic sorting system comprises a second B-class sorting machine, and the PS primary hopper is connected to the second B-class sorting machine through a conveying mechanism. 11 . The input end of the sorting machine is connected, and the second B-class sorting machine is provided with a PP/PE secondary dividing trough, a PS secondary feeding trough and a second circulating feeding trough, and the PP/PE secondary sorting The material trough is used to collect plastic wastes whose main components are PE and/or PP, the PS secondary distribution tank is used to collect plastic wastes whose main components are PS, and the second circulation distribution tank is used to collect plastic wastes from the For the rest of the plastic waste output by the second B-class sorting machine, the plastic waste treatment system is provided with a first circulating conveying mechanism, the second circulating distributing trough is connected with the first circulating conveying mechanism, and the first circulating conveying mechanism The output end of the circulating conveying mechanism is connected with the respective input ends of the first grade A sorter and the second grade A sorter. 11 . The plastic waste processing system according to claim 10 , wherein the electrostatic sorting system comprises a first C-level sorting machine, and the PS secondary hopper is connected to the first C-level sorting machine through a conveying mechanism. 12 . The input end of the grade sorting machine is connected, and the first grade C sorting machine is provided with a PS terminal material distribution tank, a third circulation material distribution tank and a fourth circulation material distribution tank, and the PS terminal material distribution tank is used for collecting The plastic waste whose main component is PS, the third circulating material trough is connected with the first circulating conveying mechanism through the conveying mechanism, the electrostatic sorting system includes a second circulating conveying mechanism, and the second circulating conveying mechanism is The output end is connected to the respective input ends of the first grade A sorter and the second grade A sorter, and the fourth circulating material trough is connected to the second circulating conveying mechanism through a conveying mechanism. 12 . The plastic waste treatment system according to claim 11 , wherein the PS terminal distributing tank is connected to the second separation sedimentation tank through a conveying mechanism, and the second floating material output end is sequentially connected to the second separation and sedimentation tank. 13 . Four vertical dehydrators, the first clear water tank and the sixth vertical dehydrator. 13 . The plastic waste treatment system according to claim 11 , wherein the PS terminal material distribution tank is connected to the second separation sedimentation tank through a conveying mechanism, and the output end of the second sedimentation material is sequentially connected with 13 . The fifth vertical dehydrator, the second clear water tank and the seventh dehydrator. 14 . The plastic waste treatment system according to claim 1 , wherein the liquid stored in the first separation and sedimentation tank is clean water. 15 . 15 . The plastic waste treatment system according to claim 1 , wherein the liquid stored in the second separation and sedimentation tank is brine, and the salinity of the brine is 5%-9%. 16 .