CN116199327A - Movable biological membrane sewage treatment device and method - Google Patents

Abstract

The invention discloses an active biofilm sewage treatment device and method comprising a reactor body, the reactor body is provided with a sewage inlet and a sewage outlet, a combined suspension filler is placed in the reactor body, and the reactor body There is a rotating shaft extending left and right inside the body, and multiple groups of stirring blades are arranged at intervals from left to right on the rotating shaft, and each group of stirring blades is composed of 2-8 pieces of mechanical mesh blades, and the mechanical mesh blades have a scoop-shaped structure , the 2-8 pieces of mechanical mesh blades are installed on the same circumference, the orientation of the opening of the mechanical mesh blades is consistent with the rotation direction of the rotating shaft, and the mechanical mesh blades are provided with a number of holes that can supply water and filter out the diameter of the filler. of filter holes. The removal efficiency of organic pollutants is high, the denitrification effect is good, the cost is low, the system runs stably, the operation cost is low, and the operation and control are simple and convenient.

Description

An active biofilm sewage treatment device and method

technical field

The invention relates to an active biofilm sewage treatment device and method, belonging to the technical field of sewage treatment.

Background technique

The contact oxidation method is a new wastewater biochemical treatment method that combines the characteristics of the activated sludge method and the biofilm method. The main equipment of this method is the biological contact oxidation filter. Fillers such as coke, gravel, plastic honeycomb, and plastic composite fiber are installed in the airtight aeration tank. The filler is submerged in water, and a blower is used to aerate and oxygenate the bottom of the filler. This method is called blast aeration; air energy From bottom to top, the waste water to be treated is entrained and freely passes through the filter material to reach the water surface. After the air escapes, the waste water returns to the bottom of the pool from top to bottom in the filter material compartment. The activated sludge is attached to the surface of the filler and will not flow with the water. Because the biofilm is directly agitated by the updraft and is constantly renewed, the purification effect is improved.

At present, the filler is fixed in the tank through the filler frame. The biofilm can only fall off by itself, and the remaining sludge is not easy to drain away. If it stays between the filter materials, it will easily cause the water quality to deteriorate and affect the treatment effect. And it is easy to have packing collapse, packing blockage, short flow phenomenon, it needs to be drained to remove and fix the packing, the aeration pan is easy to be damaged, it needs to be drained, and the aeration pan needs to be replaced after removing the fixed packing. In addition, fans need to be maintained; pipes and valves also need to be maintained, the operation is complicated, the operation and maintenance costs are high, and the investment in equipment is high.

Contents of the invention

In view of the above-mentioned problems, the first object of the present invention is to provide a kind of active biofilm sewage treatment device, and the second object is to provide an active biofilm sewage treatment method, which has high organic pollutant removal efficiency, good denitrification effect, low cost and easy system operation. Stable, low operating cost, simple and convenient operation and control.

In order to achieve the above-mentioned first purpose, the technical solution of the present invention is: a kind of active biofilm sewage treatment device, comprising a reactor body, the reactor body is provided with a sewage inlet and a sewage outlet, characterized in that: in the reaction A combined suspension ball filler is placed in the reactor body, and a rotating shaft extending left and right is arranged in the reactor body, and multiple sets of stirring blades are arranged at intervals from left to right on the rotating shaft, and each group of stirring blades consists of 2-8 pieces Composed of mechanical mesh leaves, the mechanical mesh leaves have a scoop-shaped structure, and the 2-8 pieces of mechanical mesh leaves are installed on the same circumference. A plurality of filter holes capable of supplying water and filtering out holes smaller than the diameter of the filler are arranged on the net leaf.

The introduced sewage is subjected to biological adsorption, biological aerobic treatment and biological anoxic nitrogen removal treatment in the active biofilm sewage treatment device, and the mud-water mixture after biological oxidation and anoxic nitrogen removal treatment enters the next process from the sewage outlet for treatment.

The rotation of mechanical mesh blades can supplement the dissolved oxygen in the sewage in the bioreactor. With the rotation of the blades, part of the composite suspension ball packing stays in the scoop-shaped blades and leaves the water surface. On the one hand: the sewage in the composite suspension ball packing is rotating The leaves that leave the water surface flow down to form falling water aeration; on the other hand: after the combined suspension ball filler leaves the water surface, the microorganisms attached to the filler get sufficient oxygen in the air; Sliding into the sewage, causing water splashes and reoxygenating the sewage in the bioreactor.

In addition, the rotation of the mechanical mesh blades can also facilitate the movement of the combined suspended sphere packing in the bioreactor. The low-speed rotation of the mechanical mesh blades pushes the combined suspension ball packing to move in the bioreactor, which increases the contact between the microorganisms attached to the combined suspension ball packing and the pollutants in the sewage.

Due to the large specific surface area of the combined suspension ball filler, a large number of biological bacteria will be attached. During the metabolic process, the biological bacteria will consume the organic pollutants, nitrogen, phosphorus nutrients and dissolved oxygen brought in by the sewage, which can be carried out simultaneously. Carbonization, nitrification and denitrification of organic matter, so as to effectively remove pollutants in sewage and improve the removal efficiency of pollutants.

Microorganisms grow on the surface of the filler. With the thickening of the microbial adhesion layer, the microbial film from the inside to the outside forms an anoxic layer (even anaerobic layer) and an aerobic layer in turn, which can simultaneously carry out anoxic denitrification biological reaction, aerobic Biological reaction to achieve a better effect of removing pollutants.

The combined suspension ball filler added to the bioreactor is constantly moving in the reactor under the action of the rotation and agitation of the mechanical mesh blades, and the biofilm attached to the surface of the filler is continuously shed and renewed during the collision, which maintains the activity of the biofilm and improves the biological efficiency. processing effect.

Stirring blades and rotating shafts can be made of stainless steel, carbon steel (with anti-corrosion treatment), alloy or non-metallic materials.

In the above solution: the sewage inlet and sewage outlet are respectively located on the left and right sides of the reactor body. Located at the upper end, a water hole is provided on the bottom vertical partition on the other side of the sewage inlet and outlet to increase the flow path of sewage in the bioreactor.

In the above solution: the two ends of the rotating shaft are respectively installed on the left and right side walls of the reactor body through bearings, and one end extends out of the reactor body and is connected with a motor with a reducer. The motor is a variable frequency speed regulating motor, equipped with a frequency converter, which can flexibly adjust the speed according to the actual working conditions.

In the above scheme: the reactor body is provided with a vertical partition extending back and forth, and the vertical partition is provided with a water hole at the bottom of the other side of the water inlet and outlet, and the water hole and the sewage outlet Set with a filter. The pore size of the filter screen is smaller than the packing diameter. The pore size of the filter screen is 10-50mm, which is used to intercept and prevent the filler from flowing out.

In the above scheme: the sewage inlet, the water passing hole and the sewage outlet are set up and down in a staggered manner.

In the above solution: the mechanical mesh leaves have a filter hole diameter of 10-30 mm, a hole spacing of 30-50 mm, a diameter of the combined suspension ball packing of 80-150 mm, and a specific surface area of the combined suspension ball packing of more than 800 m ² /m ³ .

In the above solution: the reactor body is provided with an online dissolved oxygen meter, and the online dissolved oxygen meter is connected with a control system to realize online monitoring and control of dissolved oxygen in the bioreactor.

In the above scheme: each group of stirring blades is composed of 3-4 pieces of mechanical mesh blades.

The second object of the present invention is achieved in the following way: a method for treating sewage with active biofilm, characterized in that: sewage enters the sewage treatment device with active biofilm from the sewage inlet, the mechanical net leaves are partially immersed in the sewage, and the stirring speed is controlled to be 0.2 -20 rpm low-speed rotation, continuously replenishing oxygen to the reactor body, the sewage and the packing fully contact and react and then discharged from the sewage outlet.

In the above solution: the maximum immersion depth of the mechanical mesh leaf can reach two-thirds to four-fifths of the length of the mechanical mesh leaf.

In order to carry out modular design and operation, the bioreactors can be operated in series, parallel or combined series and parallel according to the needs of the sewage treatment process, so as to adapt to different sewage volumes, different water quality and other working conditions, and achieve better removal of pollutants Effect.

Compared with prior art, the beneficial effect of the present invention is:

The invention realizes the adsorption of microorganisms to pollutants, biological aerobic treatment, biological anoxic nitrogen removal and other processes in the same bioreactor, and realizes the microorganisms attached to the surface of the combined suspension ball filler through the slow rotation of the mechanical mesh blades in sewage and Alternate contact in the air, the purpose of reoxygenation of sewage such as combined suspension ball filler drop, sewage drop exposure, etc. The microorganisms attached to the surface of the combined suspension ball filler absorb organic matter in the water when immersed, and absorb oxygen in the atmosphere when exposed to the air. The continuous alternating process of "oxygen enrichment and oxygen deficiency" is conducive to the oxidation and decomposition of adsorbed organic matter and the biological denitrification treatment of sewage, so as to achieve the purpose of purifying water quality. The rotation of the mechanical net leaves drives the air and causes the sewage in the biochemical reactor to turbulence, which promotes the uniform distribution of dissolved oxygen in the sewage in the reactor. The invention saves the aeration equipment, fan room and pipeline system required in the sewage treatment, so that the process requires less equipment, less maintenance workload, less floor space, and reduces construction costs; the invention rotates the mechanical mesh blades , make the microorganisms fully contact with the sewage, use the microorganisms to absorb and degrade COD, BOD and TN, so that the removal efficiency of organic pollutants is high, and the denitrification effect is good; the process flow of the present invention is simple, the operation and control are simple and convenient, and can be combined Active biofilm is formed on the surface of the suspended ball filler, which effectively prevents sludge from swelling. It can be operated in series, in parallel or in series and parallel according to the needs of the sewage treatment process, and can flexibly strengthen the function of the treatment unit; the sewage treatment effect of the present invention is good, and the quality of the effluent is good. , can effectively reduce the operating cost of sewage treatment.

Description of drawings

Figure 1 is a top view of the present invention.

Fig. 2 is a sectional view along A-A of Fig. 1 .

Detailed ways

Below by embodiment and in conjunction with accompanying drawing, the present invention will be further described:

As shown in Figures 1 and 2, an active biofilm sewage treatment device includes a reactor body 1, which is provided with a sewage inlet 2 and a sewage outlet 3, and the sewage inlet and sewage outlet are respectively located on the left and right sides of the reactor body At the upper end, a composite suspension filler 10 is placed in the reactor body. The diameter of the composite suspension ball filler is 80-150mm, and the specific surface area of the composite suspension ball filler is greater than 800m ² /m ³ .

The reactor body 1 is provided with a rotating shaft 5 extending left and right, and the two ends of the rotating shaft 5 are respectively installed on the left and right side walls of the reactor body through bearings, and one end extends out of the reactor body to connect with the motor 6 with a reducer. connected. The motor adopts frequency conversion speed regulation motor.

Multiple sets of stirring blades are arranged at intervals from left to right on the rotating shaft 5 , and 2-8 sets of stirring blades can be arranged according to the length of the reactor body 1 . Each group of stirring blades is composed of 2-8 mechanical mesh blades 4 , preferably 3-4 mechanical mesh blades 4 . The mechanical mesh blade 4 is a scoop-shaped structure, and the 2-8 mechanical mesh blades 4 are installed on the same circumference. The filler stays inside the mechanical mesh blades. The mechanical mesh blade 4 is provided with some filter holes capable of supplying water and filtering out apertures smaller than the filler diameter. The filter hole diameter of the mechanical mesh leaf is 10-30mm, and the hole spacing is 30-50mm.

A vertical partition 7 extending back and forth can be arranged in the reactor body, and the rotating shaft 5 is located above the vertical partition 7 and can be fixed by a bracket provided on the partition, and a water hole 8 is provided on the vertical partition 7 , the water hole 8 is located at the bottom of the other side of the sewage inlet and outlet, and a filter screen is arranged on the water hole 8 and the sewage outlet. The sewage inlet, the water hole and the sewage outlet are staggered up and down. Just when there is only one vertical dividing plate 7 as shown in the figure, the sewage inlet is arranged on the upper end of the front side, the sewage outlet is arranged on the upper end of the front side, and the water hole is arranged on the lower end of the rear side. This increases the flow path of the sewage in the bioreactor.

An online dissolved oxygen meter 9 is arranged in the reactor body.

When in use, the sewage enters the active biofilm sewage treatment device from the sewage inlet, and the mechanical net leaves are partially immersed in the sewage. The maximum immersion depth of the mechanical net leaves can reach two-thirds to four-fifths of the length of the mechanical net leaves. Control the stirring speed to 0.2-20 r/min and rotate at a low speed to continuously supplement oxygen into the reactor body, and the sewage and the packing will fully contact and react and then be discharged from the sewage outlet.

The introduced sewage is subjected to biological adsorption, biological aerobic treatment and biological anoxic nitrogen removal treatment in the active biofilm sewage treatment device, and the mud-water mixture after biological oxidation and anoxic nitrogen removal treatment is discharged from the sewage and enters the next process for treatment. The rotation of mechanical mesh blades can supplement the dissolved oxygen in the sewage in the bioreactor. With the rotation of the blades, part of the composite suspension ball packing stays in the scoop-shaped blades and leaves the water surface. On the one hand: the sewage in the composite suspension ball packing is rotating The leaves that leave the water surface flow down to form falling water aeration; on the other hand: after the combined suspension ball filler leaves the water surface, the microorganisms attached to the filler get sufficient oxygen in the air; Sliding into the sewage, causing water splashes and reoxygenating the sewage in the bioreactor. At the same time, the rotation of the mechanical mesh blade also promotes the activity of the combined suspension ball filler in the bioreactor. The low-speed rotation of the mechanical mesh blades pushes the combined suspension ball packing to move in the bioreactor, which increases the contact between the microorganisms attached to the combined suspension ball packing and the pollutants in the sewage.

Due to the large specific surface area of the combined suspension ball filler, a large number of biological bacteria will be attached. During the metabolic process, the biological bacteria will consume the organic pollutants, nitrogen, phosphorus nutrients and dissolved oxygen brought in by the sewage, which can be carried out simultaneously. Oxidation, nitrification and denitrification of organic matter, so as to effectively remove pollutants in sewage and improve the removal efficiency of pollutants. Microorganisms grow on the surface of the filler. With the thickening of the microbial adhesion layer, the microbial film from the inside to the outside forms an anoxic layer (even anaerobic layer) and an aerobic layer in turn, which can simultaneously carry out anoxic denitrification biological reaction, aerobic Biological reaction to achieve a better effect of removing pollutants.

The combined suspension ball filler added to the bioreactor is constantly moving in the reactor under the action of the rotation and agitation of the mechanical mesh blades, and the biofilm attached to the surface of the filler is continuously shed and renewed during the collision, which maintains the activity of the biofilm and improves the biological efficiency. processing effect.

The water quality of the influent and effluent is compared with the contact oxidation of the active biofilm sewage treatment device of the present invention and the traditional biofilm filler as shown in Table 1.

Table 1 domestic sewage treatment situation table

It can be seen that, compared with the traditional contact oxidation method, the solution in this embodiment is used to treat domestic sewage. The present invention only has a reaction tank, a combined suspension ball filler, and a mechanical net leaf, while the traditional system consists of a reaction tank, biological filler, filler bracket, It is composed of aeration pan, pipeline, valve, fan and fan room, flow meter, pressure gauge, etc., and the system composition is simpler.

The system of the present invention only needs to maintain the mechanical mesh blades, while the existing contact oxidation requires maintenance to avoid packing collapse, blockage, short flow, removal of fixed packing, aeration pans, fans, pipes, valves, etc. The maintenance cost of the present invention is low.

The process control of the present invention only needs to control the rotational speed of the mechanical mesh blade, while the traditional one needs to control the start and stop of the fan, air flow, pressure, valve switch, dissolved oxygen in sewage, etc.

The invention has lower operating cost, smaller floor area, simpler system composition, simpler operation and maintenance, better treatment effect and effluent quality, and meets the requirements of the national sewage discharge standard.

The present invention is not limited to the above-mentioned embodiments, and those of ordinary skill in the art can understand that: without departing from the principles and purposes of the present invention, various changes, modifications, replacements and modifications can be made to these embodiments, within the scope of the present invention as defined by the claims and their equivalents.

Claims (10)

1. An active biofilm sewage treatment device, comprising a reactor body, the reactor body is provided with a sewage inlet and a sewage outlet, it is characterized in that: a combined suspension ball filler is placed in the reactor body, the There is a rotating shaft extending left and right inside the reactor body, and multiple groups of stirring blades are arranged at intervals from left to right on the rotating shaft, and each group of stirring blades is composed of 2-8 pieces of mechanical mesh blades, and the mechanical mesh blades Shaped structure, the 2-8 pieces of mechanical mesh blades are installed on the same circumference, the orientation of the opening of the mechanical mesh blades is consistent with the rotation direction of the rotating shaft, and the mechanical mesh blades are provided with several holes that can supply water and filter out apertures smaller than The filter hole of the packing diameter. 2. The active biofilm sewage treatment device according to claim 1, characterized in that: the sewage inlet and the sewage outlet are respectively located on the left and right sides of the reactor body. 3. The active biofilm sewage treatment device according to claim 1 or 2, characterized in that: the two ends of the rotating shaft are respectively installed on the left and right side walls of the reactor body through bearings, and one end extends to the reactor body The outside is connected with the motor with reducer. 4. The active biofilm sewage treatment device according to claim 3, characterized in that: the reactor body is provided with a vertical partition extending forward and backward, and the vertical partition is provided at the bottom of the other side of the water inlet and outlet There is a water hole, and a filter screen is arranged on the water hole and the sewage outlet. 5. The mobile biofilm sewage treatment device according to claim 4, characterized in that: the sewage inlet, the water passing hole and the sewage outlet are arranged in a staggered manner. 6. The active biofilm sewage treatment device according to claim 5, characterized in that: the filter hole diameter of the mechanical net leaf is 10-30mm, the hole spacing is 30-50mm, and the diameter of the combined suspension ball filler is 80-150mm, The specific surface area of the combined suspension ball filler is greater than 800m ² /m ³ . 7. The active biofilm sewage treatment device according to claim 1, characterized in that: an online dissolved oxygen meter is arranged in the reactor body. 8. The mobile biofilm sewage treatment device according to claim 1, wherein each set of stirring blades is composed of 3-4 pieces of mechanical mesh blades. 9. An active biofilm sewage treatment method, characterized in that: the sewage enters the active biofilm sewage treatment device according to any one of claims 1-8 from the sewage inlet, and the mechanical mesh blade is partially immersed in the sewage to control the stirring speed It rotates at a low speed of 0.2-20 r/min, continuously replenishes oxygen to the reactor body, and the sewage and the filler fully contact and react and then are discharged from the sewage outlet. 10. The sewage treatment method with active biofilm according to claim 9, characterized in that: the maximum immersion depth of the mechanical net blade can reach two-thirds to four-fifths of the length of the mechanical net blade.

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