WO2013163963A1 - Dispositif de traitement et de recyclage par régénération des eaux usées, et procédé associé - Google Patents

Dispositif de traitement et de recyclage par régénération des eaux usées, et procédé associé Download PDF

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WO2013163963A1
WO2013163963A1 PCT/CN2013/076367 CN2013076367W WO2013163963A1 WO 2013163963 A1 WO2013163963 A1 WO 2013163963A1 CN 2013076367 W CN2013076367 W CN 2013076367W WO 2013163963 A1 WO2013163963 A1 WO 2013163963A1
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water
inlet
outlet
sludge
pump
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PCT/CN2013/076367
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English (en)
Chinese (zh)
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张世文
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波鹰(厦门)科技有限公司
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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
    • C02F1/30—Treatment of water, waste water, or sewage by irradiation
    • C02F1/32—Treatment of water, waste water, or sewage by irradiation with ultraviolet light
    • 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
    • C02F1/4672—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation
    • 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
    • C02F1/469—Treatment of water, waste water, or sewage by electrochemical methods by electrochemical separation, e.g. by electro-osmosis, electrodialysis, electrophoresis
    • C02F1/4691—Capacitive deionisation
    • 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
    • C02F1/72—Treatment of water, waste water, or sewage by oxidation
    • C02F1/76—Treatment of water, waste water, or sewage by oxidation with halogens or compounds of halogens
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/006—Electrochemical treatment, e.g. electro-oxidation or electro-osmosis
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F11/00—Treatment of sludge; Devices therefor
    • C02F11/12—Treatment of sludge; Devices therefor by de-watering, drying or thickening
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2303/00—Specific treatment goals
    • C02F2303/06—Sludge reduction, e.g. by lysis
    • 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
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1268—Membrane bioreactor systems
    • C02F3/1273—Submerged membrane bioreactors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the invention relates to a sewage treatment and regeneration recycling device and a method thereof, and belongs to the field of environmental protection.
  • China Patent 200410024576.8 discloses a process and special equipment for extracting reclaimed water from sewage. It is treated with enzymes and then filtered. A method of producing reclaimed water by disinfecting with ozone.
  • Chinese patent CN101108760B discloses a method for recycling reclaimed water through continuous microfiltration treatment of sewage that has reached the discharge standard after biochemical treatment. It uses the tail water of biochemical effluent as the source water, passes through the swirling coagulation reaction tank, and the advection multi-dump sedimentation tank. After the materialized precipitation, it enters the intermediate pool and is pumped to the continuous microfiltration system for advanced treatment to produce reclaimed water.
  • the quality of reclaimed water is not high: firstly, it is difficult to remove residual color and odor in the existing sewage purification and regeneration technology. Residual nutrients and bacteria, mold, algae, etc. remain in the reclaimed water. Temperature and light conditions will rapidly multiply, causing black body odor and water, which will cause undesirable biological scale, which will also have adverse effects on the process equipment, making the application of reclaimed water in industrial production very limited; followed by total dissolution in sewage. High in salt content and containing a large amount of calcium and magnesium salts which can form scale. When it is transported to the water process equipment through pipes, it will be damaged by long-term electrochemical corrosion, using water equipment, with calcium and magnesium salts in water. The class is continuously circulated and concentrated in the water equipment to further form scale, which may cause blockage of the water equipment.
  • the traditional reclaimed water reuse technology usually uses the flocculant and bactericide to precipitate the microorganisms, colloids and solid particles in the water during the purification process of the sewage, and then passes through the sand filter, multi-media filtration and
  • the membrane filtration purification process has the disadvantage of adding flocculant and disinfectant during the treatment process, which not only has large investment, high operating cost, but also causes flocculation and bactericide to cause different degrees of pollution to the environment.
  • the object of the present invention is to solve the problems existing in the existing sewage recycling and recycling technology, and to provide a water quality requirement for the production process water which can overcome the poor quality of the reclaimed water in the existing sewage regeneration technology and is difficult to meet the industrial production, and has large investment and operating cost. High and secondary pollution to the environment, which can reduce sewage discharge and improve water use efficiency. Sewage treatment plant.
  • Another object of the present invention is to provide a method for treating sewage and recycling.
  • the sewage treatment and regeneration recycling device of the invention is provided with a biochemical system, an electrolysis system, an MBR System and advanced processing system;
  • the biochemical system is used for biochemical treatment of sewage to obtain biochemical water, and the biochemical system is provided with a shut-off well, a coarse grid, a lifting pump, a fine grid, a grit chamber, a first-stage water distribution well, a primary sedimentation tank, a biological treatment equipment, Secondary water distribution well, secondary sedimentation tank and sludge return pump;
  • the inlet of the intercepting well is connected to the sewage discharge outlet through the pipeline
  • the outlet of the intercepting well is connected to the inlet of the coarse grid
  • the outlet of the coarse grid is connected to the inlet of the lift pump
  • the lift pump The outlet of the fine grille is connected to the inlet of the fine grate and the inlet of the grit chamber.
  • the outlet of the grit chamber is connected to the inlet of the first water distribution well.
  • the outlet of the first water distribution well is connected to the inlet of the primary sinking pool.
  • the export is connected to the import of biological treatment equipment, the outlet of the biological treatment equipment is connected to the inlet of the secondary distribution well, the outlet of the secondary distribution well is connected to the inlet of the secondary sedimentation tank, and the outlet of the secondary sedimentation tank is connected with the inlet of the electrolysis system,
  • the sludge outlet of the tank is connected to the inlet of the biological treatment equipment via the sludge return pump, and the other is connected to the inlet of the sludge treatment system.
  • the biochemical system further includes a sludge treatment system for recycling and recycling the sludge produced by the biochemical system, and the sludge treatment system is provided with a shut-off valve, a primary sludge pump, an electrolysis machine, and a buffer tank. , secondary sludge pump, sewage pump and sludge dewatering device; the inlet of the shut-off valve is connected to the sludge outlet of the secondary settling tank through the pipeline, and the outlet of the shut-off valve is connected to the inlet of the primary sludge pump, the primary sludge pump The outlet of the electrolysis machine is exported, and the outlet of the electrolysis machine is connected to the inlet of the buffer tank.
  • the water outlet of the buffer tank is connected to the water inlet of the biological treatment equipment through the sewage pump, and the buffer tank
  • the sludge outlet is connected to the inlet of the sludge dewatering device through the secondary sludge pump, and the filtrate outlet of the sludge dewatering device is connected to the water inlet of the secondary settling tank through the pipeline, and the mud cake obtained by the sludge dewatering device is shipped out.
  • the biological treatment device is one or a combination of two or more of an anaerobic tank, an anoxic tank, an aeration tank, an oxidation ditch, a sequencing batch reactor (SBR), a biological filter, a biological turntable or a biological contact oxidation tank. .
  • SBR sequencing batch reactor
  • the electrolysis machine is provided with a power source and an electrolytic cell, and the electrode in the electrolytic cell is one of graphite, titanium, iron, aluminum, zinc, copper, lead, nickel, molybdenum, chromium, metal alloy and nano catalytic inert electrode.
  • the surface layer of the nano catalytic inert electrode is coated with crystal grains of 10 to 35 nm
  • the metal oxide inert catalytic coating, the substrate of the nano catalytic inert electrode can be a titanium plate or a plastic plate, etc., the electrode has high electrocatalytic reactivity, can greatly reduce the overpotential of electrolysis, and reduce side reactions. happened.
  • the sludge dewatering device is one of a vacuum filtration dehydration device, a filter press dehydration device, a centrifugal dewatering device and a membrane filtration device
  • the filter press dewatering device is a belt filter press and a plate and frame filter press.
  • the membrane filtration device is one of microfiltration and ultrafiltration;
  • the microfiltration membrane module is one of a ceramic membrane and a metal membrane module, and
  • the ultrafiltration membrane module It is one of a ceramic film and a metal film component.
  • the electrolysis system is used for electrolyzing the biochemical treatment sewage, the electrolysis system is provided with a shut-off valve, a water supply pump and an electrolysis machine; the inlet of the shut-off valve is externally connected with a biochemical water discharge port, the inlet of the water supply pump is connected to the outlet of the shut-off valve, and the water supply pump The outlet of the electrolysis machine, the outlet of the electrolysis machine The inlet connection of the MBR system.
  • the MBR system is used for further processing the purified sewage obtained by the electrolysis system, and the MBR system is provided with a shut-off valve and a grid.
  • the inlet of the shut-off valve is connected to the outlet of the electrolysis machine of the electrolysis system, the outlet of the shut-off valve is connected to the inlet of the grid, the outlet of the grid is connected to the inlet of the MBR reaction cell, and the MBR membrane module is submerged in the MBR In the reaction tank, it is aerated by a blower and a distributed aerator.
  • the filtrate outlet of the MBR reaction tank is connected to the inlet of the water pump, and the outlet of the outlet water pump is connected to the inlet of the primary reclaimed water storage tank, MBR.
  • the sludge outlet of the reaction tank is connected to the inlet of the sewage pump, and the sludge is pumped to the sludge treatment system for treatment by the sewage pump;
  • the MBR membrane module may be selected from a polyvinylidene fluoride (PVDF) hollow fiber membrane and polypropylene ( PP) one of a hollow fiber membrane, a polysulfone (PS) hollow fiber membrane, a polyethersulfone (PES), a polyacrylonitrile (PAN), and a polyvinyl chloride (PVC) hollow fiber membrane, the MBR
  • PVDF polyvinylidene fluoride
  • PP polypropylene
  • PS polysulfone
  • PES polyethersulfone
  • PAN polyacrylonitrile
  • PVC poly
  • the working pressure is -1 ⁇ -50kPa, the working temperature is 5 ⁇ 45°C, and the pH is 1 ⁇ 14.
  • the effluent fixed suspension can be reduced to 1mg/L and the turbidity can be reduced to below 1NTU.
  • the system can completely remove bacteria and E. coli from sewage, and the coliform bacteria in the effluent is 0, while the total number of colonies is less than 1 CFU/mL. ; said The MBR cleaning system is used to clean the MBR membrane module.
  • the MBR cleaning system is provided with a cleaning liquid tank, a backwashing pump and a shut-off valve; the outlet of the cleaning liquid tank is connected to the inlet of the backwashing pump, and the outlet of the backwashing pump is connected to the inlet of the shut-off valve. Valve outlet MBR system.
  • the depth processing system is used to MBR
  • the primary reclaimed water obtained by the system is subjected to capacitive adsorption desalination and separation to obtain dialysis water and concentrated water, and the dialysis water is further purified to obtain reclaimed water.
  • the advanced treatment system is provided with a shut-off valve, a lift pump, a security filter, a water supply pump, a capacitor desalination device, Disinfection device, reclaimed water storage tank and concentrated water booster pump; inlet of the shut-off valve MBR
  • the outlet of the system primary reclaimed water storage tank, the outlet of the shut-off valve is connected to the inlet of the lift pump, the outlet of the lift pump is connected to the inlet of the security filter, the outlet of the security filter is connected to the inlet of the water supply pump, and the inlet of the water supply pump is connected to the inlet of the capacitor desalination device.
  • the dialysis water outlet of the capacitor desalination device is connected to the inlet of the sterilizing device, and the outlet of the sterilizing device is connected to the inlet of the reclaimed water storage tank; the advanced treatment system will MBR
  • the primary reclaimed water obtained by the system is pumped into the capacitor desalination device by the water supply pump through the security filter, and the dialysis water and the concentrated water are treated by the capacitor desalination device.
  • the dialysis water is disinfected by the disinfection device and then enters the storage tank to obtain the reclaimed water; the concentrated water is increased by the concentrated water.
  • the pressure pump is returned to the electrolytic purification system for recycling;
  • the disinfection device is one of an electrolysis machine, a chlorination system, a chlorine dioxide sterilizer, an ozone disinfection system, and an ultraviolet sterilizer;
  • the electrolysis machine is provided with a power source and an electrolysis tank
  • the chlorination system is provided with a chlorinator, a contact tank, a mixing device and a chlorine bottle;
  • the ozone sterilizing device is provided with an ozone generator, an ozone contact pool and a tail gas ozone decomposer.
  • the sewage treatment and regeneration recycling method of the present invention comprises the following steps:
  • Biochemical treatment The sewage enters the biochemical system through the intercepting well, and reduces the pollutants such as oil, scum, SS, COD and BOD in the sewage to make the various indicators reach GB.
  • the third-level emission standard of 18918-2002 "Emission Standards for Pollutants in Urban Sewage Treatment Plants" will be entered into the subsequent treatment process;
  • step 2) Electrolysis: After the biochemical effluent is extracted by a water pump, it is input into an electrolysis machine for electrolysis; in step 2), the electrolysis is to electrolyze the biochemical effluent to generate nascent chlorine [Cl], hydroxyl [OH] and The nascent oxygen [O] is used to oxidize and decompose organic matter such as animal and vegetable oil, petroleum, anionic surfactant, colored matter and ammonia nitrogen in the sewage, and kills microorganisms in the sewage, and at the same time, makes the sewage in the sewage
  • the suspended matter, the colloid and the charged particles aggregate to form larger particles;
  • the electrolytic electrolytic cell can have an operating voltage of 2 to 250 V, and the voltage between two adjacent electrodes can be 2 to 18 V, and the most between the two adjacent electrodes good voltage is 3 ⁇ 8V, the current density may be 3 ⁇ 400mA / cm 2, most preferably a current density of 50 ⁇ 210mA / cm 2, through
  • MBR system filtration the purified sewage treated by the electrolysis system flows into the MBR system through the pipeline for MBR
  • the system processes the separated primary reclaimed water; in step 3), the MBR
  • the system is a new type of wastewater treatment technology combining membrane separation technology and biotechnology. It uses membrane separation equipment to intercept activated sludge and macromolecular organic substances in biochemical reaction tanks. It has strong adaptability, high biochemical efficiency and anti-load shock. Strong ability, small footprint, good processing effect, etc.
  • Capacitor desalination and disinfection the primary reclaimed water filtered by the MBR system is pumped into the capacitor desalination device through the water supply pump, and the dialysis water and the concentrated water are separated by desalting, and the dialysis water passes through the disinfection device and enters the storage tank to obtain the reclaimed water; in step 4)
  • the operating condition of the capacitor desalination is a DC voltage of 110V/m ⁇ 2 ⁇ 10 6 V/m.
  • Sludge treatment The sludge produced by the biochemical system enters the sludge treatment system, destroys the structure of the sludge through electrolysis and contact reaction, breaks the cell wall of the microorganism, and the microbial intracellular material flows out into the water phase, making the refractory solidity
  • the substance becomes a soluble substance which is easily degraded, and then is returned to the biological treatment equipment through the sewage pump to be recycled for the microorganisms; the excess sludge enters the sludge dewatering device to obtain the filtrate and the mud cake, and the filtrate is returned to the second sediment through the pipeline.
  • the sewage treated by the invention has good quality of reclaimed water, and the indexes are far superior to GB/T19923-2005.
  • Urban sewage recycling The standard of industrial water quality can be used as the industrial production process water in various industries, that is, it can be directly applied to the industrial production process to achieve the purpose of clean production.
  • the invention can also treat the sludge, dissolve and oxidize the organic components in the sludge, and then reflux to the biological treatment equipment for recycling, so that the microbial cell wall in the sludge is destroyed, the cytoplasm is dissolved, and the sludge is improved.
  • Biodegradable which facilitates the degradation of subsequent microorganisms, thereby reducing the excess sludge production, and the dissolved cytoplasm can also be used as a carbon source of microorganisms to supplement its nutrients, thereby increasing biological activity, improving the efficiency of biological treatment of sewage, and achieving sewage and sewage.
  • the effect of double treatment of mud is a simple compound that produces a high quality of sewage.
  • the technical route is used to solve the technical problems of the existing sewage treatment and recycling and recycling, and has the following advantages:
  • the method for electrolytically treating sewage has the following outstanding effects: (1) Electrolysis under the action of electricity to open or break the macromolecules remaining in the sewage to enhance the biodegradability of the sewage; (2) the nascent chlorine [Cl], hydroxyl [OH] and nascent Oxygen [O] Oxidative decomposition of organic matter, rapid reduction of COD; (3) oxidative decomposition of ammonia nitrogen in the sewage, further oxidation of residual ammonia nitrogen, ammonia nitrogen removal rate of up to 80 ⁇ 90%, while eliminating odor in water.
  • High water reuse rate and low cost the reuse rate of sewage is as high as 70% to 90%, the discharge of sewage is low, and the energy consumption is low.
  • the production cost of high-purity reclaimed water is less than 1 yuan/ton, which is much lower than the current tap water price;
  • High water quality for reuse The recycled water produced by this technical route is colorless and odorless.
  • the main indicators of water quality are shown in Table 1. , can meet the water quality requirements of industrial water in various industries;
  • Table 1 Reclaimed water quality indicators project concentration project concentration pH value 6.5 ⁇ 8.5 Conductivity ( ⁇ S/cm ) ⁇ 300 Turbidity (NTU) ⁇ 1 Chloride (mg/L) ⁇ 50 Chromaticity (times) ⁇ 3 Total iron (mg/L) ⁇ 0.05 COD Cr ( mg/L ) ⁇ 10 Manganese (mg/L) ⁇ 0.1 SS ( mg/L ) ⁇ 1 Free chlorine (mg/L) ⁇ 0.1 Total alkalinity (mg/L) ⁇ 50 (based on calcium carbonate hardness) Total hardness (mg/L) ⁇ 10 (based on calcium carbonate hardness)
  • the electrolytic sludge treated by the invention has the following outstanding effects: (1) destroying the sludge structure, under the action of the electric field, the sludge floc structure can be changed to accelerate the hydrolysis of the sludge; (2) inhibiting and killing the sewage Microorganisms and viruses in the mud, a large number of strong oxidizing free radicals are generated during the electrolysis process, which not only penetrates into the cells of the microorganisms, but also blocks the microorganisms.
  • FIG. 1 is a schematic view showing the structural composition of an embodiment of a sewage treatment and regeneration recycling apparatus according to the present invention.
  • the invention designs the sewage purification and regeneration recycling process after the in-depth systematic comparative study on the composition, properties and existing treatment schemes of the biochemical effluent of the existing sewage treatment plant, through the biochemical system, electrolysis, MBR system
  • the combination of processes such as capacitor desalination forms a sewage treatment and regeneration recycling device and method thereof.
  • an embodiment of a sewage treatment and regeneration recycling device and a method thereof according to the present invention are provided with:
  • Biochemical system is used for biochemical treatment of sewage to obtain biochemical water.
  • Biochemical system is equipped with intercepting well 1, coarse grid 2, lifting pump 3, fine grid 4, grit chamber 5, first-level water distribution well 6, initial Shenchi 7, biological treatment equipment 8, secondary distribution well 9, secondary sedimentation tank 10, sludge return pump 11 and shut-off valve 12; the inlet of the intercepting well 1 is connected to the sewage discharge outlet through the pipeline, and the outlet of the intercepting well 1 is thickened
  • the inlet of the grille 2 is connected to the inlet of the lift pump 3, the outlet of the lift pump 3 is connected to the inlet of the fine grille 4, the outlet of the fine grille 4 is connected to the inlet of the grit chamber 5, and the grit chamber 5
  • the outlet is connected to the inlet of the first water distribution well 6, the outlet of the first water distribution well 6 is connected to the inlet of the primary sedimentation tank 7, the outlet of the primary sedimentation tank 7 is connected to the inlet of the biological treatment equipment 8, and the outlet of the
  • the sludge treatment system is used to regenerate and recycle the sludge produced by the biochemical system.
  • the sludge treatment system is provided with a shut-off valve 21, a primary sludge pump 22, an electrolysis machine 23, a buffer tank 24, and a shut-off valve. 25.
  • the inlet of the pump 22, the outlet of the primary sludge pump 22 is connected to the inlet of the electrolysis machine 23, the outlet of the electrolysis machine 23 is connected to the inlet of the buffer tank 24, and the outlet of the buffer tank 24 is sequentially biologically treated by the sewage pump 27 and the shut-off valve 28.
  • the water inlet of the device 8 and the sludge outlet of the buffer tank 24 are sequentially connected to the inlet of the sludge dewatering device 29 via the shut-off valve 25 and the secondary sludge pump 26, and the filtrate outlet of the sludge dewatering device 29 passes through the pipeline and the secondary settling tank.
  • the water inlet of the 10 is connected, and the mud cake obtained by the sludge dewatering device 29 is shipped out.
  • the electrode of the electrolysis machine 23 is a nano catalytic inertial electrode, and the surface layer thereof is coated with a metal oxide inert catalytic coating having a crystal grain size of 10 to 35 nm, and the substrate of the nano catalytic inert electrode may be a titanium plate or a plastic plate.
  • the electrode has high electrocatalytic reactivity, can greatly reduce the overpotential of electrolysis, and reduce the occurrence of side reactions.
  • Electrolysis system The electrolysis system is used for electrolytic treatment, and the electrolysis system is provided with a shutoff valve 31, a water supply pump 32, and an electrolysis machine 33.
  • the inlet of the shut-off valve 31 is externally connected to the biochemical water discharge port, the inlet of the water supply pump 32 is connected to the outlet of the shut-off valve 31, the outlet of the water supply pump 32 is connected to the inlet of the electrolysis machine 33, and the outlet of the electrolysis machine 33 is connected with the water inlet of the MBR system.
  • the surface layer of the nanocatalytic inert electrode of the electrolysis machine 33 of the electrolysis system is coated with a metal oxide inert catalytic coating having a crystal grain size of 10 to 35 nm, and the substrate of the nano catalytic inert electrode is a titanium plate or a plastic plate.
  • the MBR system is used to further treat the purified sewage obtained from the electrolysis system.
  • the MBR system is provided with a shutoff valve 41, a grille 42, an MBR membrane module 43, a blower 44, an aerator 45, an MBR reaction tank 46, a sewage pump 47, an outlet water pump 48, and a primary reclaimed water storage tank 49.
  • the inlet of the shutoff valve 41 is connected to the outlet of the electrolysis machine 33, the outlet of the shutoff valve 41 is connected to the inlet of the grille 42, and the outlet of the grille 42 is sequentially passed through the MBR reaction tank 46 and the outlet pump 48 to enter the primary reclaimed water storage tank 49, and the MBR reaction tank 46
  • the sludge outlet is connected to the inlet of the sewage pump 47, and the sludge is pumped by the sewage pump 47 to the sludge treatment system for treatment.
  • the MBR cleaning system is used to clean the MBR system, and is provided with a cleaning liquid tank 51, a backwash pump 52, and a shutoff valve 53.
  • the outlet of the cleaning liquid tank 51 is connected to the inlet of the backwashing pump 52
  • the outlet of the backwashing pump 52 is connected to the inlet of the shutoff valve 53
  • the outlet of the shutoff valve 53 is connected to the outlet of the MBR reaction tank 43.
  • the advanced treatment system is used for capacitive adsorption desalination and separation of the primary reclaimed water treated by the MBR system to obtain dialysis water and concentrated water.
  • the dialysis water is further purified by disinfection, and the deep treatment system is provided with a shut-off valve 61 and a lift pump. 62.
  • the inlet of the shutoff valve 61 is connected to the MBR system
  • the outlet of the primary reclaimed water storage tank 49, the outlet of the shut-off valve 61 is connected to the inlet of the lift pump 62, the outlet of the lift pump 62 is connected to the inlet of the security filter 63, the outlet of the security filter 63 is connected to the inlet of the water supply pump 64, and the inlet of the water supply pump 64.
  • the dialysis water outlet of the capacitor desalination device 65 is connected to the inlet of the sterilizing device 67 via the shutoff valve 66, and the outlet of the sterilizing device 67 is connected to the inlet of the reclaimed water storage tank 69 via the shutoff valve 68.
  • the operating conditions of the capacitive desalination device 65 of the deep processing system are DC voltages of 110 V/m to 2 x 106 V/m.
  • the water quality of the sewage is shown in Table 2.
  • Step 1 Biochemical treatment: The sewage enters the biochemical system through the intercepting well 1 and passes through the coarse grid 2, the lift pump 3 and the fine grid. 4, grit chamber 5, first-stage water distribution well 6, primary sedimentation tank 7, biological treatment equipment 8, secondary distribution well 9 and secondary sedimentation tank 10, so that its indicators reach GB 18918-2002 The third-level emission standard of the “Emission Standards for Pollutants in Urban Sewage Treatment Plants” will enter the subsequent treatment process.
  • Step 2 Electrolysis: start the water supply pump 32, and the sewage enters the electrolysis machine 33 through the shut-off valve 31 for electrolysis.
  • the surface of the nanocatalytic inert electrode of the electrode of the electrolysis machine 33 for electrolysis is coated with a crystal grain of 10 nm.
  • the metal oxide inert catalytic coating, the substrate of the nano catalytic inert electrode is a titanium plate or a plastic plate.
  • the electrolysis has an operating voltage of 6 V, a voltage between the two electrodes of 3.5 to 8.0 V, and a current density of 350 mA/cm 2 .
  • Step 3 MBR system filtration separation: the purified sewage after electrolysis passes through the grid 41 The solid impurities and colloids of the larger particles generated by electrolysis in the sewage are removed by filtration, and then enter the MBR reaction tank 46 to start the blower 44 and the aerator 45. After the aeration is oxidized, the water pump is started. Under negative pressure, water molecules are separated by the MBR membrane module 43 to obtain dialysis water, and the dialysis water is collected into the primary reclaimed water storage tank 49.
  • the membrane material of the MBR system is a polyvinylidene fluoride (PVDF) hollow fiber membrane having a pore size of 0.2 ⁇ m.
  • PVDF polyvinylidene fluoride
  • the system has a working pressure of -25 to -26 kPa, an operating temperature of 15 to 40 °C, and a pH of 5 to 9.
  • Step 4 Capacitor desalination and disinfection: the primary reclaimed water filtered by the MBR system is passed through the shut-off valve 61 and the lift pump. 62, security filter 63, water supply pump 64 pumped into the capacitor desalination device 65, desalinated separation of dialysis water and concentrated water, dialysis water after electrolysis machine 67 into the reclaimed water storage tank 69 Reclaimed water.
  • the reuse rate of sewage is 87%, and the water quality of reclaimed water is shown in Table 3.
  • the operating condition of the capacitor desalination device 65 is a DC voltage of 110 V/m to 2 ⁇ 10 6 V/m.
  • the above electrolysis machine 67 For disinfection devices.
  • the disinfecting device can be one of an electrolysis machine, a chlorination system, a chlorine dioxide sterilizer, an ozone disinfection system, and an ultraviolet sterilizer.
  • Step 5 Sludge treatment: The sludge produced by the biochemical system enters the sludge treatment system and is pumped into the electrolysis machine 23 through the primary sludge pump 22 for electrolysis.
  • the surface layer of the nano catalytic inert electrode of the electrode of the electrolysis machine 23 is coated with a metal oxide inert catalytic coating having a crystal grain size of 32 to 35 nm, and the substrate of the nano catalytic inert electrode is a titanium plate or a plastic plate.
  • the operating voltage is 12V
  • the voltage between the two poles is 3.5 to 8.0V
  • the current density is 200mA/cm 2 .
  • the sludge after electrolysis enters the buffer tank 24, so that the radical generated by the electrolysis further contacts the sludge, destroys the structure of the sludge, breaks the cell wall of the microorganism, changes the structure of the floc, and the intracellular substance flows out.
  • the hardly degradable solid material becomes a readily degradable dissolved substance, and then is returned to the biological treatment device 8 through the sewage pump 27, which is used for the microbial recycling, not only can supplement the carbon source for the microorganism, but can be supplemented by the microorganism
  • Metabolic reuse can improve the efficiency of biological treatment of sewage; and it can decompose the dissolved substances produced by cracking bacteria through the decomposition reaction of microorganisms, thereby achieving the purpose of reducing the excess sludge production.
  • the excess sludge passes through the secondary sludge pump 26 and enters the centrifugal dewatering unit 29 to obtain the filtrate and the mud cake.
  • the filtrate is returned to the secondary settling tank 10 through the pipeline, and the mud cake is transported.
  • the above centrifugal dewatering device 29 It is a sludge dewatering device.
  • the sludge dewatering device may be one of a vacuum filtration dehydration device, a filter press dehydration device, a centrifugal dewatering device, and a membrane filtration device
  • the filter press dewatering device is a belt filter press, a plate and frame filter press 2
  • the membrane filtration device is one of microfiltration and ultrafiltration
  • the microfiltration membrane module is one of a ceramic membrane and a metal membrane module
  • the ultrafiltration The membrane module is one of a ceramic membrane and a metal membrane module.
  • the water quality of the sewage is shown in Table 4.
  • Step 1 Biochemical treatment: The sewage enters the biochemical system through the intercepting well 1 and passes through the coarse grid 2, the lift pump 3 and the fine grid. 4, grit chamber 5, first-stage water distribution well 6, primary sedimentation tank 7, biological treatment equipment 8, secondary distribution well 9 and secondary sedimentation tank 10, so that its indicators reach GB 18918-2002 The third-level emission standard of the “Emission Standards for Pollutants in Urban Sewage Treatment Plants” will enter the subsequent treatment process.
  • the above biological treatment equipment 8 For the oxidation ditch.
  • the biological treatment equipment can be an anaerobic tank, an anoxic tank, an aeration tank, an oxidation ditch, a sequencing batch reactor (SBR) One or a combination of two or more of a biofilter, a biological turntable, and a biological contact oxidation cell.
  • SBR sequencing batch reactor
  • Step 2 Electrolysis: The water supply pump 32 is started, and the sewage enters the electrolysis machine 33 through the shut-off valve 31 for electrolysis.
  • the electrode of the electrolysis machine 33 is a nanocatalytic inert electrode whose surface layer is coated with a metal oxide inert catalytic coating having a crystal grain size of 15 nm, and the substrate of the nano catalytic inert electrode is a titanium plate.
  • the electrolysis has an operating voltage of 100 V, a voltage between the two electrodes of 2 to 18 V, and a current density of 3 mA/cm 2 .
  • the above nanocatalytic inert material is an electrode material of an electrolysis machine.
  • the electrode material may be one of graphite, titanium, iron, aluminum, zinc, copper, lead, nickel, molybdenum, chromium, alloys, and nanocatalytic inert materials.
  • Step 3 MBR system filtration separation: the purified sewage after electrolysis passes through the grid 41 The solid impurities and colloids of the larger particles generated by electrolysis in the sewage are removed by filtration, and then enter the MBR reaction tank 46 to start the blower 44 and the aerator 45. After the aeration is oxidized, the water pump is started. Under negative pressure, water molecules are separated by the MBR membrane module 43 to obtain dialysis water, and the dialysis water is collected into the primary reclaimed water storage tank 49.
  • the membrane material of the MBR system is a polypropylene (PP) hollow fiber membrane having a pore size of 0.1 ⁇ m.
  • MBR polypropylene
  • the system has a working pressure of -20 to -23 kPa, an operating temperature of 5 to 45 °C, and a pH of 5 to 9.
  • Step 4 Capacitor desalination and disinfection: the primary reclaimed water filtered by the MBR system is passed through the shut-off valve 61 and the lift pump. 62, security filter 63, water supply pump 64 pumped into the capacitor desalination device 65, desalinated separation of dialysis water and concentrated water, dialysis water through the ozone disinfection system 67 and then into the reclaimed water storage tank 69 Reclaimed water.
  • the reuse rate of sewage is 80%, and the water quality of reclaimed water is shown in Table 5.
  • the operating condition of the capacitor desalination device 65 is a DC voltage of 110 V/m to 2 ⁇ 10 6 V/m.
  • the above ozone disinfection system 67 For disinfection devices.
  • the disinfecting device can be one of an electrolysis machine, a chlorination system, a chlorine dioxide sterilizer, an ozone disinfection system, and an ultraviolet sterilizer.
  • Step 5 Sludge treatment: The sludge produced by the biochemical system enters the sludge treatment system and is pumped into the electrolysis machine 23 through the primary sludge pump 22 for electrolysis.
  • the electrolysis machine 23 has an operating voltage of 100 V, a voltage between the two electrodes of 2 to 18 V, and a current density of 260 mA/cm 2 .
  • the sludge after electrolysis enters the buffer tank 24, so that the radical generated by the electrolysis further contacts the sludge, destroys the structure of the sludge, breaks the cell wall of the microorganism, changes the structure of the floc, and the intracellular substance flows out.
  • the hardly degradable solid material becomes a readily degradable dissolved substance, and then is returned to the biological treatment device 8 through the sewage pump 27, which is used for the microbial recycling, not only can supplement the carbon source for the microorganism, but can be supplemented by the microorganism
  • Metabolic reuse can improve the efficiency of biological treatment of sewage; and it can decompose the dissolved substances produced by cracking bacteria through the decomposition reaction of microorganisms, thereby achieving the purpose of reducing the excess sludge production.
  • the excess sludge passes through the secondary sludge pump 26 and enters the belt filter press 29 to obtain the filtrate and the mud cake.
  • the filtrate is returned to the secondary settling tank 10 through the pipeline, and the mud cake is transported.
  • the above belt filter press 29 It is a sludge dewatering device.
  • the sludge dewatering device may be one of a vacuum filtration dehydration device, a filter press dehydration device, a centrifugal dewatering device, and a membrane filtration device
  • the filter press dewatering device is a belt filter press, a plate and frame filter press 2
  • the membrane filtration device is one of microfiltration and ultrafiltration
  • the microfiltration membrane module is one of a ceramic membrane and a metal membrane module
  • the ultrafiltration The membrane module is one of a ceramic membrane and a metal membrane module.
  • the water quality of the sewage is shown in Table 6.
  • Step 1 Biochemical treatment: The sewage enters the biochemical system through the intercepting well 1 and passes through the coarse grid 2, the lift pump 3 and the fine grid. 4, grit chamber 5, first-stage water distribution well 6, primary sedimentation tank 7, biological treatment equipment 8, secondary distribution well 9 and secondary sedimentation tank 10, so that its indicators reach GB 18918-2002 The third-level emission standard of the “Emission Standards for Pollutants in Urban Sewage Treatment Plants” will enter the subsequent treatment process.
  • the above biological treatment equipment 8 It is a combination of an anaerobic tank and a biological contact oxidation tank.
  • the biological treatment equipment can be an anaerobic tank, an anoxic tank, an aeration tank, an oxidation ditch, a sequencing batch reactor (SBR) One or a combination of two or more of a biofilter, a biological turntable, and a biological contact oxidation cell.
  • SBR sequencing batch reactor
  • Step 2 Electrolysis: The water supply pump 32 is started, and the sewage enters the electrolysis machine 33 through the shut-off valve 31 for electrolysis.
  • the electrolysis has an operating voltage of 220 V, a voltage between the two electrodes of 2 to 18 V, and a current density of 15 mA/cm 2 .
  • Step 3 MBR system filtration separation: the purified sewage after electrolysis passes through the grid 41 The solid impurities and colloids of the larger particles generated by electrolysis in the sewage are removed by filtration, and then enter the MBR reaction tank 46 to start the blower 44 and the aerator 45. After the aeration is oxidized, the water pump is started. Under negative pressure, water molecules are separated by the MBR membrane module 43 to obtain dialysis water, and the dialysis water is collected into the primary reclaimed water storage tank 49.
  • the membrane material of the MBR system is a polyvinylidene fluoride (PVDF) hollow fiber membrane having a pore size of 0.2 ⁇ m.
  • PVDF polyvinylidene fluoride
  • the system has a working pressure of -1 to -50 kPa, an operating temperature of 5 to 45 °C, and a pH of 1 to 14.
  • Step 4 Capacitor desalination and disinfection: the primary reclaimed water filtered by the MBR system is passed through the shut-off valve 61 and the lift pump. 62, security filter 63, water supply pump 64 pumped into the capacitor desalination device 65, desalinated separation of dialysis water and concentrated water, dialysis water through the chlorine dioxide sterilizer 67 and then into the reclaimed water storage tank 69 Reclaimed water.
  • the reuse rate of sewage is 74%, and the water quality of reclaimed water is shown in Table 7.
  • the operating condition of the capacitor desalination device 65 is a DC voltage of 110 V/m to 2 ⁇ 10 6 V/m.
  • the above chlorine dioxide sterilizer 67 For disinfection devices.
  • the disinfecting device can be one of an electrolysis machine, a chlorination system, a chlorine dioxide sterilizer, an ozone disinfection system, and an ultraviolet sterilizer.
  • Step 5 Sludge treatment: The sludge produced by the biochemical system enters the sludge treatment system and is pumped into the electrolysis machine 23 through the primary sludge pump 22 for electrolysis.
  • the electrolysis machine 23 has an operating voltage of 220 V, a voltage between the two electrodes of 2 to 18 V, and a current density of 15 mA/cm 2 .
  • the sludge after electrolysis enters the buffer tank 24, so that the radical generated by the electrolysis further contacts the sludge, destroys the structure of the sludge, breaks the cell wall of the microorganism, changes the structure of the floc, and the intracellular substance flows out.
  • the hardly degradable solid material becomes a readily degradable dissolved substance, and then is returned to the biological treatment device 8 through the sewage pump 27, which is used for the microbial recycling, not only can supplement the carbon source for the microorganism, but can be supplemented by the microorganism
  • Metabolic reuse can improve the efficiency of biological treatment of sewage; and it can decompose the dissolved substances produced by cracking bacteria through the decomposition reaction of microorganisms, thereby achieving the purpose of reducing the excess sludge production.
  • the excess sludge enters the ultrafiltration membrane filtration unit 29 through the secondary sludge pump 26 to obtain the filtrate and the mud cake, and the filtrate is returned to the secondary sedimentation tank 10 through the pipeline, and the mud cake is shipped.
  • the ultrafiltration membrane module is a metal membrane module.
  • the above ultrafiltration membrane filtration device 29 It is a sludge dewatering device.
  • the sludge dewatering device may be one of a vacuum filtration dehydration device, a filter press dehydration device, a centrifugal dewatering device, and a membrane filtration device
  • the filter press dewatering device is a belt filter press, a plate and frame filter press 2
  • the membrane filtration device is one of microfiltration and ultrafiltration
  • the microfiltration membrane module is one of a ceramic membrane and a metal membrane module
  • the ultrafiltration The membrane module is one of a ceramic membrane and a metal membrane module.
  • the present invention is easy to implement industrially and has good industrial applicability.

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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)

Abstract

L'invention concerne un dispositif de traitement et de recyclage par régénération des eaux usées, comprenant un système biochimique, un système d'électrolyse, un système BRM et un système de traitement profond. L'invention concerne un procédé de traitement et de recyclage par régénération des eaux usées, comprenant les étapes suivantes : (1) traitement biochimique ; (2) électrolyse ; (3) filtration par système BRM ; (4) dessalage et stérilisation ; (5) traitement des boues. Le dispositif et le procédé selon l'invention permettent de surmonter les défaillances existantes de la technologie de régénération des eaux usées, qui font que la qualité de l'eau régénérée est médiocre, qu'il est difficile de satisfaire les exigences concernant la qualité de l'eau pour la consommation d'eau, que l'investissement est élevé, que le coût de fonctionnement est élevée et que cela provoque une pollution secondaire de l'environnement. Grâce à l'invention, le rejet d'eaux usées peut être réduit, et l'efficacité d'utilisation de l'eau est améliorée. Par ailleurs, la régénération et le recyclage des boues sont mis en oeuvre, et les dommages éventuellement causés à l'environnement par les boues sont éliminés.
PCT/CN2013/076367 2012-05-03 2013-05-29 Dispositif de traitement et de recyclage par régénération des eaux usées, et procédé associé WO2013163963A1 (fr)

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