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CN113636725A - A kind of method for treating PTA wastewater RO concentrated water - Google Patents

A kind of method for treating PTA wastewater RO concentrated water Download PDF

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Publication number
CN113636725A
CN113636725A CN202110993414.9A CN202110993414A CN113636725A CN 113636725 A CN113636725 A CN 113636725A CN 202110993414 A CN202110993414 A CN 202110993414A CN 113636725 A CN113636725 A CN 113636725A
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wastewater
cod
treatment
electrochemical
reaction device
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张旭
马文静
宋昭仪
常凯
胡金玲
吴军亮
杨洪新
李岚兵
金明哲
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Sinochem Environmental Holdings Ltd
Sinochem Environmental Technology Engineering Co Ltd
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Sinochem Environmental Holdings Ltd
Sinochem Environmental Technology Engineering Co Ltd
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    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F9/00—Multistage treatment of water, waste water or sewage
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F1/46114—Electrodes in particulate form or with conductive and/or non conductive particles between them
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/467—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/66—Treatment of water, waste water, or sewage by neutralisation; pH adjustment
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/46—Treatment of water, waste water, or sewage by electrochemical methods
    • C02F1/461—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis
    • C02F1/46104—Devices therefor; Their operating or servicing
    • C02F1/46109—Electrodes
    • C02F2001/46133—Electrodes characterised by the material
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2103/00—Nature of the water, waste water, sewage or sludge to be treated
    • C02F2103/34—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32
    • C02F2103/36—Nature of the water, waste water, sewage or sludge to be treated from industrial activities not provided for in groups C02F2103/12 - C02F2103/32 from the manufacture of organic compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4612—Controlling or monitoring
    • C02F2201/46125—Electrical variables
    • C02F2201/4614—Current
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2201/00—Apparatus for treatment of water, waste water or sewage
    • C02F2201/46—Apparatus for electrochemical processes
    • C02F2201/461—Electrolysis apparatus
    • C02F2201/46105—Details relating to the electrolytic devices
    • C02F2201/4619—Supplying gas to the electrolyte
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/08—Chemical Oxygen Demand [COD]; Biological Oxygen Demand [BOD]
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2301/00—General aspects of water treatment
    • C02F2301/04—Flow arrangements
    • C02F2301/043—Treatment of partial or bypass streams
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes

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  • Life Sciences & Earth Sciences (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)

Abstract

本发明属于工业废水治理技术领域，具体的说是一种处理PTA废水RO浓水的方法。将PTA膜浓水预混调节pH值至3～10，而后将调节后废水连续通入电化学反应装置中进行电化学处理，浓水中污染物在电极表面及电解槽内发生氧化还原反应，使污染物被分解，直至废水中COD低于50mg/L即可达标排放。本发明使用电化学方法可在较宽温度和pH条件下进行，不需引入新的离子，能耗低，处理效果好，且对废水中溴离子浓度没有特殊要求，与生化技术组合后，处理后出水可稳定达标。

Figure 202110993414

The invention belongs to the technical field of industrial wastewater treatment, in particular to a method for treating RO concentrated water of PTA wastewater. The PTA membrane concentrated water is premixed to adjust the pH value to 3-10, and then the adjusted wastewater is continuously passed into the electrochemical reaction device for electrochemical treatment. The pollutants are decomposed until the COD in the wastewater is lower than 50mg/L, and the discharge can be up to the standard. The electrochemical method can be carried out under wide temperature and pH conditions without introducing new ions, the energy consumption is low, the treatment effect is good, and there is no special requirement for the concentration of bromide ions in the wastewater. After the water can be stably up to the standard.

Figure 202110993414

Description

Method for treating PTA wastewater RO concentrated water
The technical field is as follows:
the invention belongs to the technical field of industrial wastewater treatment, and particularly relates to a method for treating PTA wastewater RO concentrated water.
Background art:
with the continuous enlargement of the industrial scale of Pure Terephthalic Acid (PTA) in China, the discharge amount of PTA waste water is larger and larger. As the main pollutant of the PTA wastewater is aromatic compound, the direct discharge to the environment will cause serious pollution. The PTA wastewater has the characteristics of unstable water quality and water quantity, high pollutant concentration, large pH change and the like, and is typical refractory organic wastewater.
The PTA production water consumption is large, a large amount of wastewater is generated in the production process, and under the situation of water resource shortage and water pollution problems in China, the deep recycling of the PTA wastewater is one of the main ways of protecting water resources, improving enterprise benefits and maintaining sustainable development of PTA production enterprises. After conventional anaerobic and aerobic biochemical treatment, PTA effluent has high salt content and contains a certain amount of COD and heavy metals, most of the water is treated by adopting a reverse osmosis desalination process, the final produced water is used as circulating cooling make-up water, and the membrane concentrated water (RO concentrated water) remaining after recycling is difficult to biochemically treat and has high technical difficulty in further treatment reaching the standard, and the investment and operation cost is also high. With the popularization and application of the reverse osmosis desalination process in the recycling of industrial wastewater, the further standard treatment of COD (chemical oxygen demand) remained in membrane concentrated water becomes a difficult problem.
Chinese patent (application No. 201610738169.6) discloses a pretreatment method for residual RO concentrated water after PTA sewage is desalted and recycled by double membranes, which is characterized in that two pretreatment processes of Fenton oxidation and hydrolytic acidification are organically combined, and effluent after treatment is subjected to biochemical treatment. After Fenton oxidation treatment, the COD of the wastewater is reduced from 200mg/L to 150mg/L, and the wastewater can not reach the standard after further biochemical treatment; and the Fenton oxidation process generates a large amount of sludge, and the sludge treatment cost is high.
Chinese patent (application No. 201910231741.3) discloses a treatment method of RO concentrated water containing PTA wastewater, which adopts a combined process of biological denitrification, ozone oxidation and biochemical treatment to treat, and biochemical effluent flows back to an ozone oxidation treatment unit or a biological denitrification treatment unit at the front end. However, the COD of the used PTA wastewater RO concentrated water is 120-140 mg/L, the TOC is 32-40 mg/L, the processing capacity of the process is limited, and the treatment requirement of the RO concentrated water under higher concentration cannot be met.
Chinese patent (application No. 202011022795.8) discloses a comprehensive treatment method of PTA-containing wastewater, which comprises the steps of sequentially passing the PTA-containing wastewater through a PTA wastewater treatment system, a tail water regeneration treatment system and an RO strong brine treatment system; the RO strong brine treatment system comprises an ozone oxidation unit and a biochemical treatment unit, and COD of the treated RO strong brine is less than or equal to 50mg/L, NH3N is less than or equal to 2mg/L, TN and less than or equal to 10 mg/L. The COD of the PTA wastewater RO concentrated water is 120-140 mg/L. The invention is to reduce Br–Influence on ozone oxidation degree, Br control during RO membrane water inflow–The concentration is lower than 30mg/L, and the treatment for reducing the alkalinity is carried out before the ozone oxidation, the treatment flow is long, and a large amount of medicament is required to be added.
The treatment method has a certain treatment effect on PTA wastewater RO concentrated water, but has certain condition requirements on water quality or limited treatment capacity (COD is 120-140 mg/L), and simultaneously needs medicament auxiliary treatment; the process is complex, the treatment cost is high, the method has no universality on the RO concentrated water of the PTA wastewater, and the possibility of secondary pollution exists.
The invention content is as follows:
the invention aims to make up the defects of the prior art and provides a method for stably treating PTA wastewater RO concentrated water.
In order to achieve the purpose, the technical scheme of the invention is as follows:
a method for treating PTA wastewater RO concentrated water is characterized in that: the pH value of PTA membrane concentrated water is premixed and adjusted to 3-10, then the adjusted wastewater is continuously introduced into an electrochemical reaction device for electrochemical treatment, and the pollutants in the concentrated water are subjected to oxidation-reduction reaction on the surface of an electrode and in an electrolytic cell (namely, the surface of the electrode is subjected to electron transfer and is subjected to oxidation reaction with generated hydroxyl radicals and the like), so that the pollutants are decomposed until the COD in the wastewater is lower than 50mg/L, and the wastewater can reach the standard and be discharged.
In the electrochemical reaction apparatus, the current density was set to 1mA/cm2～200mA/cm2。
The electrochemical reaction device is a two-dimensional electrode reaction device or a three-dimensional electrode reaction device.
The two-dimensional electrochemical reaction device comprises an electrolytic tank, the electrolytic tank is provided with an anode plate and a cathode plate, and the anode plate and the cathode plate are respectively connected with the anode and the cathode of a power supply; the anode electrode plate can be made of any one of graphite, metal, DSA and BDD.
The three-dimensional electrochemical reaction device comprises an electrolytic tank, the electrolytic tank is provided with an anode plate, a cathode plate, a particle electrode and other structures, and the anode plate and the cathode plate are respectively connected with the anode and the cathode of a power supply; the particle electrode is arranged between the anode plate and the cathode plate, and the anode plate electrode can be made of any one of graphite, metals, DSA and BDD.
When the above-mentioned electrochemical reaction apparatus was used with graphite electrodes as the cathode and anode of the electrochemical reaction apparatus, the current density was set to 10mA/cm2Generally, after the PTA wastewater RO concentrated water with COD less than or equal to 130mg/L is treated by an electrochemical device, the COD of the effluent is less than or equal to 50 mg/L.
When the COD value of the wastewater (COD is more than 130mg/L) after electrochemical treatment is higher than 50mg/L, the wastewater can be introduced into a biochemical unit for aerobic biochemical reaction treatment, so that the COD in the wastewater is lower than 50mg/L, and the wastewater can be discharged after reaching the standard.
And when the COD of the wastewater treated by the biochemical unit is higher than 50mg/L, refluxing the wastewater, introducing the wastewater into the electrochemical reaction device for electrochemical treatment again, discharging the wastewater when the COD of the wastewater is lower than 50mg/L, introducing the wastewater into the biochemical unit for aerobic treatment if the COD of the wastewater after the electrochemical treatment does not reach the standard, taking the COD in the effluent as an index, and refluxing the wastewater again for electrochemical treatment and the biochemical unit until the COD of the wastewater reaches the standard.
The biochemical unit is a conventional aerobic biochemical reaction; the PTA concentrated water is discharged after biochemical treatment and RO membrane treatment.
The electrochemical treatment unit can adopt reflux with a certain reflux ratio, so that the treatment capacity of the electrochemical reaction device is improved to a certain extent; meanwhile, when the COD value of the effluent is higher than the emission limit value and is smaller, the effluent is introduced into the biochemical treatment unit.
The invention has the beneficial effects that:
1. the method can be carried out under the conditions of wider temperature and pH value by using an electrochemical method, does not need to introduce new ions, has low energy consumption and good treatment effect, does not have special requirements on the concentration of bromide ions in the wastewater, and can ensure that the treated effluent can stably reach the standard after being combined with biochemical technology.
2. The invention can treat PTA wastewater RO concentrated water with COD of 50 mg/L-250 mg/L, and can also treat PTA wastewater RO concentrated water with higher COD by means of backflow, current density improvement and combined technology.
Drawings
FIG. 1 is a process flow diagram of the present invention.
FIG. 2 is a schematic diagram of a two-dimensional reactor used in an embodiment of the present invention.
FIG. 3 is a schematic diagram of a three-dimensional reactor used in an embodiment of the present invention.
The specific implementation mode is as follows:
the following examples are presented to further illustrate embodiments of the present invention, and it should be understood that the embodiments described herein are for purposes of illustration and explanation only and are not intended to limit the invention.
According to the invention, the electrochemical method is combined with the biochemical method for treating pollutants in the PTA wastewater RO concentrated water for the first time, and the difficultly-degradable organic matters in the PTA wastewater RO concentrated water can be decomposed by the electrochemical method, so that the problem that the PTA wastewater RO concentrated water is difficultly treated is solved; the electrochemical method does not introduce new ions to cause secondary pollution, and the treatment method is simple. After the high-concentration PTA wastewater RO concentrated water with COD more than 130mg/L is subjected to electrochemical treatment with COD less than 100mg/L, the concentrated water is combined with a biochemical process, and the effluent can be stably discharged up to the standard (COD is less than 50 mg/L). The combination with biochemical process can greatly reduce partial energy consumption of electrochemical process, save operation cost and achieve the purpose of environmental protection.
The following embodiments treat PTA wastewater RO concentrated water, namely wastewater of a certain PTA production enterprise is subjected to physicochemical and biochemical treatment according to a conventional mode, and then is concentrated by an ultrafiltration and reverse osmosis process to generate high-salinity wastewater, namely PTA wastewater RO concentrated water. The pH value is approximately equal to 8-9, and the COD value is approximately equal to 95-250 mg/L.
Example 1:
and (3) a reasonable flow of wastewater is shown, referring to fig. 1, the PTA wastewater RO concentrated water generated by a certain plant is input into a reservoir, multiple batches of wastewater with different pH values are premixed, and then the pH value is 8.5, and the COD value is 107 mg/L. Introducing the pre-mixed PTA membrane concentrated water into a two-dimensional electrochemical reaction device (see figure 2) continuously, wherein the flow rate is 200L/h, and the current density is set to be 10mA/cm2(ii) a The pollutants in the wastewater are subjected to oxidation/reduction reaction on the surface of the anode and are oxidized by generated OH in the electrolytic cell, so that the COD of the effluent is approximately equal to 40mg/L and is less than the standard requirement of 50mg/L, and the wastewater after electrochemical treatment can be directly discharged.
The two-dimensional electrochemical reaction device comprises an electrolytic tank, the electrolytic tank is provided with an anode plate and a cathode plate, and the anode plate and the cathode plate are respectively connected with the anode and the cathode of a power supply; the anode plate and the cathode plate are both graphite electrodes. The electrolytic bath preferably adopts a cuboid structure.
Example 2
Inputting the PTA wastewater RO concentrated water generated by a certain factory into a reservoir, premixing a plurality of batches of wastewater with different pH values, and then setting the pH value to be 8.8 and the COD value to be 143 mg/L. Introducing the pre-mixed PTA membrane concentrated water into a two-dimensional electrochemical reaction device (see figure 2) continuously, wherein the flow rate is 200L/h, and the current density is set as10mA/cm2(ii) a The pollutants in the wastewater are subjected to oxidation/reduction reaction on the surface of the anode and are simultaneously oxidized by generated OH in the electrolytic cell, so that the effluent COD is approximately equal to 51 mg/L.
The two-dimensional electrochemical reaction device comprises an electrolytic tank, the electrolytic tank is provided with an anode plate and a cathode plate, and the anode plate and the cathode plate are respectively connected with the anode and the cathode of a power supply; the anode plate and the cathode plate are both graphite electrodes. The electrolytic bath preferably adopts a cuboid structure.
And (3) the effluent after electrochemical treatment enters an aerobic biochemical treatment unit, continuous aeration is carried out according to the conventional aerobic biochemical treatment with the retention time of 24h, and the treated effluent COD is 32mg/L and is less than the standard requirement of 50mg/L, and the treated effluent can be directly discharged.
Example 3:
inputting the PTA wastewater RO concentrated water generated by a certain factory into a reservoir, premixing a plurality of batches of wastewater with different pH values, adjusting the pH value to 11, adjusting the COD value to 175mg/L, and adjusting the pH value to be approximately equal to 9 by using sulfuric acid. Introducing the pre-mixed PTA membrane concentrated water into a two-dimensional electrochemical reaction device (see figure 2) continuously, wherein the flow rate is 200L/h, and the current density is set to be 10mA/cm2(ii) a The pollutants in the wastewater are subjected to oxidation/reduction reaction on the surface of the anode and are simultaneously oxidized by generated OH in the electrolytic cell, so that the COD of the effluent is approximately equal to 58 mg/L.
The two-dimensional electrochemical reaction device comprises an electrolytic tank, the electrolytic tank is provided with an anode plate and a cathode plate, and the anode plate and the cathode plate are respectively connected with the anode and the cathode of a power supply; the anode plate and the cathode plate are both graphite electrodes. The electrolytic bath preferably adopts a cuboid structure.
And (3) allowing effluent after electrochemical treatment to enter an aerobic biochemical treatment unit, keeping for 24h, continuously aerating, and directly discharging the treated effluent with COD (chemical oxygen demand) of 36mg/L which is less than the standard requirement of 50 mg/L.
Example 4:
inputting the PTA wastewater RO concentrated water generated by a certain factory into a reservoir, premixing a plurality of batches of wastewater with different pH values, and then setting the pH value to be 8.2 and the COD value to be 248 mg/L. Introducing the pre-mixed PTA membrane concentrated water into a three-dimensional electrochemical reaction device (see figure 3) continuously, wherein the flow rate is 200L/h, and the current density is set to be 10mA/cm2(ii) a The pollutants in the wastewater are subjected to oxidation/reduction reaction on the surface of the anode and are simultaneously oxidized by generated OH in the electrolytic cell, so that the effluent COD is approximately equal to 96 mg/L.
The three-dimensional electrochemical reaction device comprises an electrolytic tank, the electrolytic tank is provided with an anode plate and a cathode plate, and the anode plate and the cathode plate are respectively connected with the anode and the cathode of a power supply; the anode plate and the cathode plate are both graphite electrodes, and the particle electrode is carbon-based particles. The electrolytic bath preferably adopts a cuboid structure.
The effluent after electrochemical treatment enters an aerobic biochemical treatment unit, stays for 24 hours, and is continuously aerated, and the COD of the treated effluent is 63 mg/L; the biochemical effluent is returned to the electrochemical treatment unit for secondary treatment, and after the treatment, the COD is 38mg/L which is less than the standard requirement of 50mg/L, and the treated water can be directly discharged.
Example 5:
inputting the PTA wastewater RO concentrated water generated by a certain factory into a reservoir, premixing a plurality of batches of wastewater with different pH values, and then setting the pH value to be 8.2 and the COD value to be 248 mg/L. The pre-mixed PTA membrane concentrated water is continuously introduced into a three-dimensional electrochemical reaction device (see figure 3), the flow rate is 300L/h, the reflux flow rate is 100L/h, and the current density is set to be 10mA/cm2(ii) a The pollutants in the wastewater are subjected to oxidation/reduction reaction on the surface of the anode and are simultaneously oxidized by generated OH in the electrolytic cell, so that the COD of effluent is approximately equal to 74 mg/L.
The three-dimensional electrochemical reaction device comprises an electrolytic tank, the electrolytic tank is provided with an anode plate and a cathode plate, and the anode plate and the cathode plate are respectively connected with the anode and the cathode of a power supply; the anode plate and the cathode plate are both graphite electrodes, and the particle electrode is carbon-based particles. The electrolytic bath preferably adopts a cuboid structure.
The effluent after electrochemical treatment enters an aerobic biochemical treatment unit, stays for 24 hours, and is continuously aerated, and the COD of the treated effluent is 45 mg/L; it is less than the standard requirement of 50mg/L and can be directly discharged.
Example 6:
inputting the PTA wastewater RO concentrated water generated by a certain factory into a reservoir, premixing a plurality of batches of wastewater with different pH values, and then setting the pH value to be 8.5 and the COD value to be 112 mg/L. Introducing concentrated water of the pre-mixed PTA membrane into a three-dimensional electrochemical reactor continuouslyIn the device (see FIG. 3), the flow rate was 300L/h, and the current density was set to 10mA/cm2(ii) a The pollutants in the wastewater are subjected to oxidation/reduction reaction on the surface of the anode and are simultaneously oxidized by generated OH in the electrolytic cell, so that the COD of the effluent is approximately equal to 57 mg/L.
The three-dimensional electrochemical reaction device comprises an electrolytic tank, the electrolytic tank is provided with an anode plate and a cathode plate, and the anode plate and the cathode plate are respectively connected with the anode and the cathode of a power supply; the anode plate is PbO2The negative plate is a graphite electrode, and the particle electrode is carbon-based particles. The electrolytic bath preferably adopts a cuboid structure.
The effluent after electrochemical treatment enters an aerobic biochemical treatment unit, stays for 24 hours, and is continuously aerated, and the COD of the treated effluent is 41 mg/L; it is less than the standard requirement of 50mg/L and can be directly discharged.
The main characteristics and technical advantages of the invention are shown above, and the invention has the advantages of capability of treating PTA wastewater RO concentrated water under wider temperature and pH conditions, good treatment effect, no introduction of new ions, simple treatment method, low energy consumption and the like. The present invention is not limited to the above-described embodiments, and various changes and modifications may be made without departing from the spirit and scope of the invention, which is to be protected by the accompanying claims.

Claims (7)

1.一种处理PTA废水RO浓水的方法，其特征在于：将PTA膜浓水预混调节pH值至3～10，而后将调节后废水连续通入电化学反应装置中进行电化学处理，浓水中污染物在电极表面及电解槽内发生氧化还原反应，使污染物被分解，直至废水中COD低于50mg/L即可达标排放。1. a method for processing PTA waste water RO concentrated water, is characterized in that: PTA membrane concentrated water is premixed to adjust pH value to 3～10, and then the waste water after adjustment is continuously passed into the electrochemical reaction device to carry out electrochemical treatment, The pollutants in the concentrated water undergo a redox reaction on the surface of the electrode and in the electrolytic cell, so that the pollutants are decomposed, until the COD in the wastewater is less than 50mg/L, and the discharge can reach the standard. 2.按权利要求1所述的方法，其特征在于：所述电化学反应装置中，电流密度设置为1mA/cm2～200mA/cm2。2 . The method according to claim 1 , wherein in the electrochemical reaction device, the current density is set to be 1 mA/cm 2 to 200 mA/cm 2 . 3 . 3.按权利要求1所述的方法，其特征在于：所述电化学反应装置为二维电极反应装置或三维电极反应装置。3. The method according to claim 1, wherein the electrochemical reaction device is a two-dimensional electrode reaction device or a three-dimensional electrode reaction device. 4.按权利要求3所述的方法，其特征在于：所述二维电化学反应装置包括电解槽，所述的电解槽设有阳极板和阴极板，所述的阳极板和阴极板分别与电源的正极和负极相连接；阳极电极板材质可以选用石墨、金属类、DSA类、BDD中的任意一种。4. The method according to claim 3, characterized in that: the two-dimensional electrochemical reaction device comprises an electrolytic cell, and the electrolytic cell is provided with an anode plate and a cathode plate, and the anode plate and the cathode plate are respectively The positive and negative electrodes of the power supply are connected; the material of the anode electrode plate can be any one of graphite, metal, DSA, and BDD. 5.按权利要求3所述的方法，其特征在于：所述三维电化学反应装置包括电解槽，所述的电解槽设有阳极板、阴极板、粒子电极及其他结构，所述的阳极板和阴极板分别与电源的正极和负极相连接；其中，粒子电极置于阳极板和阴极板中间，阳极电极板材质可以选用石墨、金属类、DSA类、BDD中的任意一种。5. The method according to claim 3, characterized in that: the three-dimensional electrochemical reaction device comprises an electrolytic cell, and the electrolytic cell is provided with an anode plate, a cathode plate, a particle electrode and other structures, and the anode plate and the cathode plate are respectively connected to the positive and negative electrodes of the power supply; wherein, the particle electrode is placed between the anode plate and the cathode plate, and the material of the anode electrode plate can be any one of graphite, metal, DSA, and BDD. 6.按权利要求1-5任意一项所述的方法，其特征在于：所述废水经电化学处理后，当COD值高于50mg/L时，可将废水通入生化单元进行好氧生化反应处理，使得废水中COD低于50mg/L，即可达标排放。6. The method according to any one of claims 1-5, characterized in that: after the wastewater is electrochemically treated, when the COD value is higher than 50 mg/L, the wastewater can be passed into the biochemical unit for aerobic biochemical treatment Reaction treatment, so that the COD in the wastewater is less than 50mg/L, which can be discharged up to the standard. 7.按权利要求6所述的方法，其特征在于：所述生化单元处理后废水COD高于50mg/L时，将废水回流通入电化学反应装置中再次进行电化学处理，待废水COD低于50mg/L即可排放，若电化学处理后COD未达标将通入生化单元进行好氧处理，以出水中COD为指标，未达标将再次回流进行电化学处理、生化单元直至废水COD达标。7. The method according to claim 6, characterized in that: when the COD of the wastewater after treatment by the biochemical unit is higher than 50 mg/L, the wastewater is refluxed into the electrochemical reaction device for electrochemical treatment again, and the COD of the wastewater is low. It can be discharged at 50mg/L. If the COD does not meet the standard after electrochemical treatment, it will be passed into the biochemical unit for aerobic treatment. The COD in the effluent is used as the indicator. If it fails to meet the standard, it will flow back to the electrochemical treatment and biochemical unit until the COD of the wastewater reaches the standard.
CN202110993414.9A 2021-08-27 2021-08-27 A kind of method for treating PTA wastewater RO concentrated water Pending CN113636725A (en)

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