WO2022082954A1 - System and method for treating preparation wastewater by using multi-phase multi-dimensional electrolysis pretreatment process+a/o+mbr - Google Patents

Abstract

A system and method for treating preparation wastewater by using a multi-phase multi-dimensional electrolysis pretreatment process+A/O+MBR. The system comprises wastewater collection tanks, a multi-phase multi-dimensional pretreatment system, an A/O treatment system, and an MBR tank; the wastewater collection tanks comprise a high-concentration wastewater collection tank and a comprehensive wastewater collection tank. By means of a synergistic effect with the A/O treatment system and the MBR tank, a wastewater treatment system using the multi-phase multi-dimensional pretreatment system as the main can effectively remove the pollutants in wastewater and improve the denitrification efficiency.

Description

A system and method for treating preparation wastewater by using multiphase and multidimensional electrolytic pretreatment process + A/O + MBR technical field

The invention belongs to the technical field of industrial wastewater treatment, and in particular relates to a system and method for treating formulation wastewater by utilizing a multiphase and multidimensional electrolytic pretreatment process + A/O + MBR.

Background technique

At this stage, the treatment rate and qualification rate of my country's preparation production wastewater are not high, and most of the preparation production wastewater has not been classified, collected and treated by quality, and the treatment process is difficult to meet the discharge standards. The domestic preparation production wastewater treatment process is mainly based on biological methods. Most of the enterprises have built their own sewage treatment stations, but the treatment effect is not good, and decentralized treatment is the main method. Preparation wastewater treatment includes various methods, which can be divided into physical method, chemical method and biological method according to different treatment principles. In practical applications, the water quality fluctuates greatly, and a single treatment method often cannot make the effluent meet the water quality standard taken over by the sewage treatment station in the park.

At present, the physical treatment technology of preparation production wastewater mainly includes adsorption method and coagulation method, mainly to remove SS, chromaticity and COD substances. The adsorption method is to use an adsorbent with strong adsorption capacity, so that one or several components in the wastewater are adsorbed on the surface. In preparation production wastewater treatment, adsorption method is mainly used in pretreatment and advanced treatment. Different adsorbents have different selectivity for wastewater adsorption, but usually adsorbents have good adsorption effect, high cost, and difficult regeneration process. Generally, large-scale There are few applications of wastewater treatment in pharmaceutical enterprises. Coagulation method is one of the physicochemical treatment methods often used for pharmaceutical wastewater. The coagulation method mainly realizes the separation of mud and water in the sedimentation tank after flocculating the macromolecular organic matter into flocs. The coagulation method has the advantages of simple process, low cost and high treatment efficiency for insoluble suspended solids. However, the removal effect of organic matter with high water solubility is poor, and the amount of sludge is large and requires subsequent treatment. Chemical treatment of preparation wastewater mainly converts macromolecular organic matter into small molecular organic matter through oxidants to improve biodegradability, usually including ozone oxidation, pure chlorine or sodium hypochlorite oxidation, Fenton oxidation, electrolytic oxidation, etc. The chemical oxidation method is mainly in the front of the biochemical reaction, the oxidant oxidizes the macromolecular organic matter to the small molecular organic matter, the COD removal rate is low, the cost is high, and the application is more extensive. The micro-electrolysis method uses iron and carbon as reaction carriers, and utilizes the potential difference between Fe and C and the solution to generate an electrode reaction. The new ecology of the electrode reaction product has high chemical characteristics, and can undergo redox reactions with various components in the preparation production wastewater, destroying the structure of macromolecular organic matter in the wastewater. The newly generated Fe ²⁺ hydrolyzate has a strong adsorption capacity, and can adsorb macromolecular organic matter, or combine with hydrogen peroxide to form a micro-electrocatalytic oxidation reaction, which is widely used. The biological method is mainly to oxidize and degrade macromolecular organic matter into small molecular organic matter through microbial anaerobic reaction, and at the same time, the fermentation reaction converts organic C into methane, and at the same time, combined with other biochemical processes, ammonia nitrogen is removed.

In multiphase multidimensional electrolysis, the electrodes of traditional two-dimensional electrolysis cells are filled with granular or other chip-like working electrode materials, and the surface of the loaded working material is charged to become a new one pole (third pole), and electrical reactions can occur on the surface of the working electrode material. , that is, compared with the traditional two-dimensional electrode, the multi-dimensional electrode can increase the surface-to-body ratio of the electrolytic cell, and can increase the material moving speed due to the small particle spacing, and improve the current efficiency and processing effect.

Multi-dimensional electrodes are generally filled with porous materials with large contact resistance and large specific surface area between the main electrodes. When a high voltage is applied, each particle forms a pair of counter electrodes, and the current is divided into three parts: ① Reaction current. The charge moving in the liquid flows from one end of the particle to the other end through the particle, and then enters the solution; ② bypass current. It only reacts at the main electrode and does not pass the current of the particles; ③ short-circuit current. Particles are connected to particles, and current flows directly through the particles. The colloids in water are enriched by electrophoresis, that is, the charged colloids move to the electrodes with opposite charges, and are enriched and deposited on the electrodes under the action of electrostatic attraction and surface energy. Has adsorption. Through the above effects, the pollutants are enriched on the surface of the working electrode, and under the action of the current, electrochemical redox reactions and decomposition reactions occur, and the pollutants are directly or indirectly oxidized. In addition, some gases such as oxygen and hydrogen are often generated on the anode and cathode. These gases exist in the form of microbubbles that can adhere to colloids or formed flocs to remove contaminants from the water. In addition, the electrolyte flows through the pores between the particles and inside the porous material, which strengthens the mass transfer process in the electrode and greatly accelerates the rate of the degradation reaction of organic pollutants. Through the above effects, multiphase and multidimensional electrolysis can efficiently and quickly remove toxic and harmful substances in water.

Preparation wastewater treatment is very difficult, and it is necessary to combine physical coagulation and chemical oxidation to improve biodegradability. Therefore, biological methods mainly play the role of improving biodegradability and reducing COD.

Due to the high COD, many characteristic pollutant factors, large fluctuation of water quality, and irregular discharge characteristics of wastewater from preparation production, the treatment cost of this type of wastewater is high and the efficiency is low. Therefore, developing a system that can efficiently treat this type of wastewater has become a research hotspot of current related workers.

SUMMARY OF THE INVENTION

The main purpose of the present invention is to overcome the existing problems of high COD, many characteristic pollutant factors, large fluctuation of water quality, and irregular discharge of preparation production wastewater that is difficult to treat with high efficiency and low cost, and to provide a multi-phase and multi-dimensional electrolysis pretreatment process. The +A/O+MBR system and method for treating formulation wastewater can realize efficient and stable treatment of formulation production wastewater.

The purpose of the present invention and the solution to its technical problems are achieved by adopting the following technical solutions.

According to the present invention, a system for treating formulation wastewater by using a multiphase and multidimensional electrolytic pretreatment process + A/O + MBR is characterized in that: it includes a wastewater collection tank, a multiphase multidimensional pretreatment system, an A/O treatment system and an MBR. pool; the waste water collection pool includes a high-concentration waste water collection pool and a comprehensive waste water collection pool.

The aforementioned system for treating formulation wastewater by using multiphase and multidimensional electrolysis pretreatment process+A/O+MBR is characterized in that: the high-concentration wastewater collection tank includes two, one of which is used to collect high-concentration wastewater for water distribution average After that, the pump is lifted to the multi-phase and multi-dimensional electrolysis pretreatment system, and then another one collects and distributes water; the comprehensive wastewater collection tank includes 2, one of which is used to collect low-concentration wastewater and pretreated high-concentration wastewater for water distribution. After the average value is averaged, the pump is lifted to the A/O system, and another water is collected and distributed.

The aforesaid system for treating preparation wastewater by using multi-phase and multi-dimensional electrolysis pretreatment process + A/O + MBR is characterized in that: the multi-phase multi-dimensional pre-treatment system contains high-efficiency catalysts, and the high-efficiency catalysts are high-temperature sintering of iron and carbon. The iron-carbon ball filler, the iron content of the iron-carbon ball filler is 75±3%, the carbon content is 15±3%, the specific surface area is 1.2±0.2㎡/g, the strength is ≥600kgf/cm ² , and the bulk porosity is ≥65% , the bulk density is 1.4±0.1t/m ³ .

The aforementioned system for treating preparation wastewater by using multiphase and multidimensional electrolysis pretreatment process + A/O + MBR is characterized in that: the MBR membrane of the MBR tank is an MBR flat membrane, and the membrane flux is 0.2-0.3 m ³ /m ² .d.

The aforesaid system for treating formulation wastewater by using multiphase and multidimensional electrolysis pretreatment process + A/O + MBR is characterized in that: the A/O treatment system includes an anoxic pool and an aerobic pool which are connected in sequence.

The purpose of the present invention and the solution to its technical problems are also achieved by the following technical solutions.

According to a method for systematically treating wastewater by utilizing multiphase and multidimensional electrolytic pretreatment process+A/O+MBR to treat formulation wastewater proposed by the present invention, the steps are:

(1) The high-concentration wastewater is raised to the pH adjustment tank by the pump after the average value of the high-concentration wastewater collection tank;

(2) Adjust the pH of the raw material drug production wastewater to 2-3 in the pH adjustment tank, and adjust it by adding 10% industrial sulfuric acid through the metering pump, and set up a pH meter in the pH adjustment tank and the metering pump to automatically start and stop. ;

(3) The wastewater after adjusting the pH value flows into the multi-phase and multi-dimensional electrolytic cell by gravity to react, and the effective residence time is controlled at 3-4 hours, and the electrolytic reaction and the oxidation reaction are carried out;

(4) The effluent after the reaction of the multi-phase and multi-dimensional electrolytic cell flows into the coagulation and sedimentation tank. The coagulation and sedimentation tank is divided into three grids. Adjust to 8-9, then flow into the second grid and add anionic high molecular weight PAM to strengthen the coagulation effect, and finally enter the third grid, in which there is a vertical flow sedimentation tank. There are central cylinder, overflow weir and mud bucket to complete solid-liquid separation;

(5) The effluent of the coagulation and sedimentation tank enters the comprehensive wastewater collection tank and is mixed with low-concentration wastewater in a homogeneous and uniform amount, and then the pump is lifted to the A/O treatment system. According to the ammonia nitrogen content of the effluent from the O tank, the reflux ratio of the nitrification solution is controlled to be 200-300 %, strengthen the denitrification treatment;

(6) The effluent from the O pool flows into the MBR pool by itself, passes through the aerobic biochemical reaction and membrane filtration of the MBR pool, and is finally pumped out by the effluent self-priming pump under negative pressure.

The aforementioned method for systematically treating wastewater by utilizing multiphase and multidimensional electrolysis pretreatment process + A/O + MBR to treat preparation wastewater is characterized in that: in the electrolytic reaction, the current is controlled at 0-36A, and the voltage is controlled at 0-100V; In the oxidation reaction, hydrogen peroxide is added, and the ratio of the dosage of hydrogen peroxide to the COD removal is 1:3.

The aforementioned method for systematically treating wastewater by utilizing multiphase and multidimensional electrolysis pretreatment process+A/O+MBR to treat formulation wastewater is characterized in that: in the A/O treatment system, the reflux ratio of nitrification solution is controlled to be 200-300%, so The sludge return ratio of the MBR is controlled at 50-150%.

The aforesaid method for systematically treating wastewater by utilizing multiphase and multidimensional electrolysis pretreatment process+A/O+MBR to treat formulation wastewater is characterized in that: the COD of the influent water of the whole system is not more than 4000mg/L, and the salt concentration is not more than 5000mg/L.

By the above-mentioned technical scheme, the present invention has at least the following advantages:

(1) The multiphase and multidimensional electrolytic pretreatment system of the present invention is a technical improvement in the application of the original electrochemical treatment method. In multiphase multidimensional electrolysis, the electrodes of traditional two-dimensional electrolysis cells are filled with granular or other chip-like working electrode materials, and the surface of the loaded working material is charged to become a new one pole (third pole), and electrical reactions can occur on the surface of the working electrode material. That is, compared with the traditional two-dimensional electrode, the multi-dimensional electrode can increase the surface-to-body ratio of the electrolytic cell, and can increase the material moving speed due to the small particle spacing, and improve the current efficiency and processing effect.

The multiphase and multidimensional electrolytic pretreatment system of the invention has the characteristics of simple treatment, small footprint, convenient management, small sludge volume, low treatment cost and the like. Multiphase and multidimensional electrolysis can increase the face-to-body ratio of the electrolytic cell, improve the current efficiency and processing capacity, and also facilitate continuous operation, which can be operated at different current densities. Another feature of multi-phase multi-dimensional electrolysis is that it does not use or uses less chemicals, simple post-processing, small footprint, large processing capacity, convenient management, etc., which is called cleaning treatment method. It can overcome the shortcomings of the original flat electrode, increase the electrode surface area per unit cell volume, and increase the material moving speed. Therefore, the processing capacity per unit cell volume is increased, and the electrolysis efficiency of the treatment solution with low conductivity can be effectively improved. This technology has been successfully applied in water treatment, and the treatment experiments on actual industrial wastewater such as urban domestic sewage, printing and dyeing, leather, and pharmaceuticals have been carried out, and satisfactory results have been obtained. Compared with the traditional electrolysis method, the multiphase and multidimensional electrolysis increases the electrode surface area per unit cell volume, and the electrode distance changes irregularly and dynamically, which can provide a larger instantaneous current intensity at a lower current density. It generates strong oxidizing compound oxygen radicals, and at the same time, it uses the characteristics of high salt content in high-concentration wastewater to electrolyze to generate oxidizing substances such as hypochlorite, which indirectly oxidizes organic matter in the water and improves the electrolysis efficiency and treatment capacity of wastewater.

(2) The multi-phase and multi-dimensional electrolysis pretreatment system of the present invention includes a multi-phase and multi-dimensional electrolytic cell, a high-efficiency catalyst, an aeration system, and a high-efficiency electrode. The multi-phase multi-dimensional electrolytic cell is made of PPH material, which has the characteristics of high strength, strong corrosion resistance, strong acid and alkali resistance, and good sealing performance. The high-efficiency catalyst is an iron-carbon ball filler sintered with iron and carbon at high temperature. The iron content of the iron-carbon ball filler is 75±3%, the carbon content is 15±3%, the specific surface area is 1.2±0.2㎡/g, and the strength is ≥600kgf/cm ^2. The bulk porosity is ≥65%, and the bulk density is 1.4±0.1t/m ³ . The aeration system adopts a perforated aeration system with two-way staggered arrangement, and the material of the aeration system is ABS material. The high-efficiency electrode selects electrodes with different areas, different layers and different layouts according to the amount of water treated. The electrode material is TA2, and it is plated with rare precious metals. The positive and negative electrodes of the other electrodes can be automatically switched periodically during the actual operation, which can effectively Reduce electrode corrosion and pollution. The MBR membrane of the MBR pool is an MBR flat membrane with a membrane flux of 0.2 to 0.3 m ³ /m ² .d. In the actual operation process, the frequency of membrane cleaning is low, on average once every six months, and only online cleaning is required. In addition, the biochemical reaction and membrane filtration of the MBR membrane bioreactor can stably ensure the quality of the effluent.

(3) The multi-phase multi-dimensional electrolysis of the present invention can well destroy macromolecular substances in the waste water of the formulation and degrade the toxic and harmful substances of macromolecules into small molecular organic substances, so as to prevent the toxic effect on the subsequent biochemical pool microorganisms.

(4) The small-molecule easily degradable organic matter contained in the pretreated effluent of the present invention can be effectively biochemically degraded in the A/O pool, thereby achieving the efficient removal of COD, and the nitrification solution of the O pool is returned to the A pool, which improves the Nitrogen removal effect. And further removal of COD and filtration of MBR membrane in the MBR pool can ensure that the effluent quality of the system is stable and up to the standard.

(5) The method of the present invention has the characteristics of good treatment effect, strong impact load resistance, stable water effluent and the like.

The above description is only an overview of the technical solution of the present invention. In order to understand the technical means of the present invention more clearly and implement it according to the content of the description, the following detailed description is given with the preferred embodiments of the present invention and the accompanying drawings.

Description of drawings

FIG. 1 is a flow chart of wastewater treatment according to the method of the present invention.

Detailed ways

In order to make it easier to understand the technical means, creative features, goals and effects realized by the present invention, the technical solutions in the embodiments of the present invention will be clearly and completely described below in conjunction with the embodiments of the present invention and the accompanying drawings. The embodiments described above are only a part of the embodiments of the present invention, but not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present invention.

According to the system for treating formulation wastewater using multiphase and multidimensional electrolysis pretreatment process + A/O + MBR according to the present invention, the system includes wastewater collection tank, multiphase multidimensional pretreatment system, A/O treatment system and MBR tank. Wastewater collection ponds include high-concentration wastewater collection ponds and comprehensive wastewater collection ponds. The high-concentration wastewater collection tank includes two, one of which is used to collect high-concentration wastewater for average distribution and then pumped to the multi-phase and multi-dimensional electrolysis pretreatment system, and then the other collects and distributes water; the comprehensive wastewater collection tank includes 2 One of them is used to collect the low-concentration wastewater in the plant area and the pretreated high-concentration wastewater, and then the average water distribution is carried out by the pump to the A/O system, and then the other one collects and distributes water. The multi-phase and multi-dimensional pretreatment system includes multi-phase and multi-dimensional electrolytic cells, high-efficiency catalysts, aeration systems, and high-efficiency electrodes. The multi-phase multi-dimensional electrolytic cell is made of PPH material, which has the characteristics of high strength, strong corrosion resistance, strong acid and alkali resistance, and good sealing performance. The high-efficiency catalyst is an iron-carbon ball filler sintered with iron and carbon at high temperature. The iron content of the iron-carbon ball filler is 75±3%, the carbon content is 15±3%, the specific surface area is 1.2±0.2㎡/g, and the strength is ≥600kgf/cm ^2. The bulk porosity is ≥65%, and the bulk density is 1.4±0.1t/m ³ . The aeration system adopts a perforated aeration system with two-way staggered arrangement, and the material of the aeration system is ABS material. The high-efficiency electrode selects electrodes with different areas, different layers and different layouts according to the amount of water treated. The electrode material is TA2, and it is plated with rare precious metals. The positive and negative electrodes of the other electrodes can be automatically switched periodically during the actual operation, which can effectively Reduce electrode corrosion and pollution. The MBR membrane of the MBR pool is an MBR flat membrane with a membrane flux of 0.2 to 0.3 m ³ /m ² .d. In the actual operation process, the frequency of membrane cleaning is low, on average once every six months, and only online cleaning is required. In addition, the biochemical reaction and membrane filtration of the MBR membrane bioreactor can stably ensure the quality of the effluent. The A/O treatment system includes an anoxic pool and an aerobic pool connected in sequence.

According to a method for systematically treating wastewater using multiphase and multi-dimensional electrolytic pretreatment process + A/O + MBR to treat formulation wastewater according to the present invention, the steps are: (1) passing high-concentration wastewater through a high-concentration wastewater collection tank and averaging After equalization, the pump is raised to the pH adjustment tank; (2) the pH of the raw material drug production wastewater is adjusted to 2 to 3 in the pH adjustment tank, adjusted by adding 10% industrial sulfuric acid through the metering pump, and adjusted in the pH adjustment tank. There is a pH meter and a metering pump to automatically start and stop in a chain; (3) the wastewater after adjusting the pH value flows to the multi-phase multi-dimensional electrolytic cell by gravity for reaction, and the effective residence time is controlled within 3 to 4 hours, and the electrolytic reaction and oxidation reaction are carried out. In the electrolysis reaction, the current is controlled at 0~36A, and the voltage is controlled at 0~100V; hydrogen peroxide is added in the electrolytic oxidation reaction, and the ratio of the hydrogen peroxide dosage to the COD removal is 1:3; (4) After the multiphase and multidimensional electrolytic cell reaction The latter effluent enters the coagulation and sedimentation tank, which is divided into three compartments. In the first compartment, industrial liquid alkali is added to adjust the pH value of the effluent from the multiphase and multi-dimensional electrolysis tank to 8 to 9, and then it flows into the second compartment. Add anionic high molecular weight PAM to strengthen the coagulation effect, and finally enter the third grid. In the third grid, there is a vertical flow sedimentation tank. The vertical flow sedimentation tank is equipped with a central cylinder, an overflow weir and a mud bucket, so as to complete the solid-liquid (5) The effluent of the coagulation and sedimentation tank enters the comprehensive wastewater collection tank and is mixed with low-concentration wastewater in a homogeneous and homogeneous amount, and then the pump is lifted to the A/O treatment system. ～300%, strengthen the denitrification treatment; (6) The effluent from the O pool flows into the MBR pool, passes through the aerobic biochemical reaction of the MBR and membrane filtration, and finally is discharged by the negative pressure suction of the effluent self-priming pump.

In the above method, the reflux ratio of nitrification solution in the A/O treatment system is controlled at 200-300%, and the sludge reflux ratio of the MBR is controlled at 50-150%. The COD of the influent water of the whole system does not exceed 4000mg/L, and the salt concentration does not exceed 5000mg/L.

Referring to the accompanying drawings, the following describes in detail with specific embodiments.

Example 1

Please refer to Fig. 1, a kind of system and method of utilizing multi-phase multi-dimensional electrolysis pretreatment process+A/O+MBR to treat preparation waste water of a preferred embodiment of the present invention is applied to a certain medicine in High-tech Medicine Valley, Jiangbei New District, Nanjing City The company's wastewater treatment station.

The wastewater treatment station includes high-concentration wastewater collection, comprehensive wastewater collection tank, pH adjustment tank, multi-phase multi-dimensional electrolysis tank, coagulation sedimentation tank, A/O+MBR integrated equipment, sludge dewatering equipment, dosing equipment, etc.

There are 2 high-concentration wastewater collection tanks, with a single effective residence time of 24h and a high-concentration wastewater volume of 1t/h. The pH adjustment tank is made of PPH material, with dimensions of length×width×height=1.0×1.0×3.0m, V=3.0m ^3. The effective volume is 2.5m ³ , the residence time is 2.5h, and it is equipped with a stirring system. The effluent from the pH adjustment tank flows to the multi-phase multi-dimensional electrolytic cell; 3.0×2.0m, residence time 4-5h, and equipped with aeration system and overflow effluent system; coagulation reaction tank consists of two pools connected in series, the effective volume of each pool is 2.5m ³ , and the residence time is 2.5h , internal anti-corrosion treatment, and equipped with a stirring system; the size of the coagulation sedimentation tank length × width × height = 2.0 × 2.0 × 3.0m, the surface load is 0.25m ³ /m ² .h; A/O system consists of series A It consists of pool and O pool, and the residence time is 9h and 18h respectively. Pool A is equipped with stirring system, pool O is equipped with microporous aerator; MBR pool has a residence time of 12h, equipped with aeration system and MBR flat membrane, MBR pool The nitrification solution is refluxed through two reflux pumps, one is used and the other is prepared; the effluent of the MBR tank is sucked by negative pressure through two self-priming pumps, one is used and the other is prepared.

The removal rate obtained at each stage in the actual operation process is shown in Table 1.

Table 1 Removal rate of each treatment stage

It can be seen from the results in Table 1 that the multi-phase and multi-dimensional electrolytic pretreatment process + A/O + MBR of the present invention has high removal rate of pollutants at each stage of the system for treating formulation wastewater, and the effect is obvious.

The above are only preferred embodiments of the present invention, and do not limit the present invention in any form. Although the present invention has been disclosed above with preferred embodiments, it is not intended to limit the present invention. The skilled person, without departing from the scope of the technical solution of the present invention, can make some changes or modifications to equivalent examples of equivalent changes by using the methods and technical contents disclosed above, provided that the content of the technical solution of the present invention is not departed from, Any simple modifications, equivalent changes and modifications made to the above embodiments according to the technical essence of the present invention still fall within the scope of the technical solutions of the present invention.

Claims (9)

1. A system for treating preparation wastewater by utilizing a multiphase and multidimensional electrolytic pretreatment process+A/O+MBR, characterized in that it comprises a wastewater collection tank, a multiphase multidimensional pretreatment system, an A/O treatment system and an MBR tank; the wastewater The collection ponds include high-concentration wastewater collection ponds and comprehensive wastewater collection ponds.
2. The system for treating formulation wastewater using multiphase and multi-dimensional electrolysis pretreatment process + A/O + MBR according to claim 1, characterized in that: the high-concentration wastewater collection tank comprises two, one of which is used to collect high-concentration wastewater After the average water distribution is carried out, the pump is lifted to the multi-phase and multi-dimensional electrolysis pretreatment system, and then another water is collected and distributed; the comprehensive wastewater collection tank includes 2, one of which is used to collect the low-concentration wastewater in the plant area and the pretreated wastewater. The high-concentration wastewater is distributed to the A/O system by the pump, and then collected and distributed by another.
3. The system for treating formulation wastewater by using a multi-phase and multi-dimensional electrolytic pretreatment process + A/O + MBR according to claim 1, wherein the multi-phase multi-dimensional pretreatment system includes a high-efficiency catalyst, and the high-efficiency catalyst is Iron and carbon high-temperature sintered iron-carbon ball filler, the iron content of the iron-carbon ball filler is 75±3%, the carbon content is 15±3%, the specific surface area is 1.2±0.2㎡/g, the strength is ≥600kgf/cm ² , the accumulation The porosity is ≥65%, and the bulk density is 1.4±0.1t/m ³ .
4. The system for treating formulation wastewater by using multiphase and multidimensional electrolysis pretreatment process+A/O+MBR according to claim 1, characterized in that: the MBR membrane of the MBR tank is an MBR flat membrane, and the membrane flux is between 0.2 and 0.3 m ³ /m ² .d.
5. The system for treating formulation wastewater by using multiphase and multidimensional electrolysis pretreatment process + A/O + MBR according to claim 1, characterized in that: the A/O treatment system comprises an anoxic pool and an aerobic pool connected in sequence.
6. A method for systematically treating wastewater by utilizing a multiphase and multidimensional electrolytic pretreatment process+A/O+MBR to treat formulation wastewater, the steps of which are:

   (1) The high-concentration wastewater is raised to the pH adjustment tank by the pump after the average value of the high-concentration wastewater collection tank;

   (2) Adjust the pH of the preparation wastewater to 2 to 3 in the pH adjustment tank, and adjust it by adding 10% industrial sulfuric acid through the metering pump, and set up a pH meter in the pH adjustment tank and the metering pump to automatically start and stop;

   (3) The wastewater after adjusting the pH value flows to the multi-phase multi-dimensional electrolytic cell by gravity for reaction, and the effective residence time is controlled at 3-4 hours, and the micro-electrolysis reaction and the redox reaction are carried out;

   (4) The effluent after the reaction of the multi-phase and multi-dimensional electrolytic cell flows into the coagulation and sedimentation tank. The coagulation and sedimentation tank is divided into three grids. Adjust to 8-9, then flow into the second grid and add anionic high molecular weight PAM to strengthen the coagulation effect, and finally enter the third grid, in which there is a vertical flow sedimentation tank. There are central cylinder, overflow weir and mud bucket to complete solid-liquid separation;

   (5) The effluent of the coagulation and sedimentation tank enters the comprehensive wastewater collection tank and is mixed with low-concentration wastewater in a homogeneous and uniform amount, and then the pump is lifted to the A/O treatment system. According to the ammonia nitrogen content of the effluent from the O tank, the reflux ratio of the nitrification solution is controlled to be 200-300 %, strengthen the denitrification treatment;

   (6) The effluent from the O pool flows into the MBR pool, and is finally discharged by the negative pressure of the effluent self-priming pump through the biochemical reaction and membrane filtration of the MBR pool.
7. The method for systematically treating wastewater by utilizing multiphase and multidimensional electrolysis pretreatment process+A/O+MBR to treat formulation wastewater according to claim 6, wherein the current in the electrolytic reaction is controlled at 0-36A, and the voltage is controlled at 0-36A. 0-100V; hydrogen peroxide is added in the oxidation reaction, and the ratio of the dosage of hydrogen peroxide to the COD removal is 1:3.
8. The method for systematically treating wastewater by utilizing multiphase and multi-dimensional electrolytic pretreatment process+A/O+MBR to treat formulation wastewater according to claim 6, characterized in that: in the A/O treatment system, the reflux ratio of nitrification solution is controlled at 200 ～300%, and the sludge return ratio of the MBR is controlled at 50～150%.
9. The method for systematically treating wastewater by utilizing multiphase multi-dimensional electrolytic pretreatment process+A/O+MBR to treat formulation wastewater according to claim 6, wherein the COD of the influent water of the whole system is not more than 4000mg/L, and the salt concentration is not more than 4000mg/L. more than 5000mg/L.

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