CN114873696A - Water treatment system for synchronously removing N-P-COD (nitrogen-phosphorus-oxygen demand) in cathode electrocoagulation and electrooxidation process coupling - Google Patents

Water treatment system for synchronously removing N-P-COD (nitrogen-phosphorus-oxygen demand) in cathode electrocoagulation and electrooxidation process coupling Download PDF

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CN114873696A
CN114873696A CN202210306018.9A CN202210306018A CN114873696A CN 114873696 A CN114873696 A CN 114873696A CN 202210306018 A CN202210306018 A CN 202210306018A CN 114873696 A CN114873696 A CN 114873696A
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cod
sedimentation
electrocoagulation
cathode
treatment system
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毛旭辉
李彦
朱华
汪娴慧
崔佳鑫
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Wuhan University WHU
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Wuhan University WHU
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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
    • 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
    • C02F1/463—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrocoagulation
    • 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
    • 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
    • C02F1/461—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
    • C02F1/4674—Treatment of water, waste water, or sewage by electrochemical methods by electrolysis by electrochemical disinfection; by electrooxydation or by electroreduction by electrooxydation with halogen or compound of halogens, e.g. chlorine, bromine
    • 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
    • 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
    • C02F2001/007—Processes including a sedimentation step
    • 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
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/105—Phosphorus compounds
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F2101/00—Nature of the contaminant
    • C02F2101/10—Inorganic compounds
    • C02F2101/16—Nitrogen compounds, e.g. ammonia
    • 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
    • C02F2209/00—Controlling or monitoring parameters in water treatment
    • C02F2209/40—Liquid flow rate
    • 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
    • C02F2209/42—Liquid level
    • 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
    • C02F2301/08—Multistage treatments, e.g. repetition of the same process step under different conditions
    • 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

Abstract

The invention relates to the technical field of sewage treatment equipment, in particular to a water treatment system for synchronously removing N-P-COD (nitrogen-oxygen-chemical oxygen demand) in a cathode electrocoagulation and electrooxidation process coupling manner. The bag is water inlet, sedimentation system, clean water basin and the delivery port that communicates in proper order, the sedimentation system includes electric connection's metal negative pole and positive pole, and during operation, the interior electrolyte of sedimentation system is the solution that contains sodium chloride. The invention transfers the electric flocculation process which generally occurs at the anode to the cathode, utilizes the hydrogen evolution reaction of the cathode to generate a local alkaline environment, promotes the alkaline corrosion dissolution of the metal electrode to generate floc dephosphorization, simultaneously couples the chlorine evolution process of the anode to remove ammonia nitrogen and COD, and simultaneously realizes the processes of electric flocculation dephosphorization, electrochemical oxidation denitrification and organic matter removal in a single electrolysis system. The system of the invention solves the conflict of the anode corrosion and inert protection under the requirement of synchronously removing ammonia nitrogen, phosphorus and COD, and avoids the invalid hydrogen evolution process of the cathode.

Description

Water treatment system for synchronously removing N-P-COD (nitrogen-phosphorus-oxygen demand) in cathode electrocoagulation and electrooxidation process coupling
Technical Field
The invention relates to the technical field of sewage treatment equipment, in particular to a water treatment system for synchronously removing N-P-COD (nitrogen-oxygen-chemical oxygen demand) in a cathode electrocoagulation and electrooxidation process coupling manner.
Background
The discharge of a large amount of nitrogen and phosphorus nutrient elements in sewage is the main reason of water eutrophication, and nitrogen and phosphorus removal is the basic requirement of sewage treatment. Electrochemical treatment technology has the advantages of simple operation, rapid response, intensive device, green and high efficiency, etc., and is considered to be one of the most promising water treatment technologies. The electrochemical denitrification mainly refers to that the ammonia nitrogen is directly removed from the surface of the anode by an electrochemical oxidation method or Cl in solution is utilized - 、Br - Reduction to Cl 2 Or Br 2 The strong oxidizing substances are used for removing ammonia nitrogen, and meanwhile, the electrochemical oxidation technology has a good removing effect on partial organic matters. Phosphorus removal is accomplished primarily by the process of electroflocculation. The electric flocculation uses aluminum and iron as sacrificial anodes, flocs such as hydroxyl polymer and the like are formed after the anodes lose electrons, and the flocs and phosphate form precipitates, so that the purpose of removing phosphorus is achieved. At present, the application of electrochemical processes in nitrogen and phosphorus removal is mostly studied independently, because the electrochemical oxidation process needs an inert anode, and pollutants are directly oxidized at the anode or indirectly oxidized by active substances generated at the anode. The electroflocculation process requires the sacrificial metal anode to leach out the metal ions to produce the necessary flocculant. The different requirements for the same anode lead to the difficulty of electrochemically removing nitrogen, phosphorus and COD simultaneously in a single electrolysis system. The cathode reaction usually only realizes the side reaction of hydrogen evolution and does not contribute to pollutant removal.
If the cathode and the anode can be used for reaction at the same time, an electrochemical treatment system capable of removing ammonia nitrogen, phosphorus and COD can be realized, and the electrochemical treatment system has important significance for saving energy consumption and reducing the occupied area of treatment equipment.
Disclosure of Invention
The invention aims to provide a water treatment system for synchronously removing N-P-COD (nitrogen-oxygen-chemical oxygen demand) by coupling a cathode electrocoagulation process and an electrooxidation process, wherein the electrocoagulation process generally occurring at an anode is transferred to the cathode, a cathode hydrogen evolution reaction is utilized to generate a local alkaline environment, the alkaline corrosion dissolution of a metal electrode is promoted to generate floc dephosphorization, the chlorine evolution process of the anode is coupled to remove ammonia nitrogen and COD, and the processes of electrocoagulation dephosphorization, electrochemical oxidation denitrification and organic matter removal are simultaneously realized in a single electrolysis system.
The scheme adopted by the invention for realizing the purpose is as follows: a water treatment system for synchronously removing N-P-COD in the process of cathode electrocoagulation and electrooxidation is disclosed, which comprises a water inlet, a precipitation system, a clean water tank and a water outlet which are sequentially communicated, wherein the precipitation system comprises a metal cathode and a ruler-stabilized anode which are electrically connected, and during operation, an electrolyte in the precipitation system is a solution containing sodium chloride.
Preferably, the sedimentation system comprises an electrolysis device and a sedimentation tank which are communicated with each other, the electrolysis device comprises an electrolysis cell, and a metal cathode and an metal anode which are arranged in the electrolysis cell, and a water outlet of the electrolysis cell is communicated with the sedimentation tank.
Preferably, the metal cathode is any one of an aluminum plate, a magnesium plate and a zinc plate; the anode is any one of a DSA (dimensionally stable anode), a platinized titanium anode, a boron-doped diamond electrode and a graphite electrode.
Preferably, a water outlet valve is arranged at the water outlet of the electrolytic cell.
Preferably, the clean water tank is communicated with the electrolytic cell through a pipeline, and a chemical box is arranged between the clean water tank and the electrolytic cell.
Preferably, the medicament box and the electrolytic cell are both internally provided with water level controllers.
Preferably, the sedimentation tank is divided into a first sedimentation area, a second sedimentation area and a third sedimentation area which are arranged side by two partition plates, the bottom of each partition plate and the bottom of the sedimentation tank are arranged in a non-closed mode, the first sedimentation area is communicated with the electrolytic tank, and the third sedimentation area is communicated with the clean water tank.
Preferably, the second settling zone has a plurality of inclined plates arranged in parallel.
Preferably, the bottom of the sedimentation tank is provided with a V-shaped hopper.
Preferably, the concentration of sodium chloride in the electrolytic cell is 0.1-2mol/L during operation. More preferably, the concentration of sodium chloride in the electrolytic cell is 0.1 to 1mol/L during operation.
The invention has the following advantages and beneficial effects: the invention provides a system for synchronously removing ammonia nitrogen, phosphorus and COD in sewage, aiming at solving the problems that the ammonia nitrogen, phosphorus and COD in the existing sewage are difficult to reach the standard simultaneously and the electrochemical treatment needs to be carried out separately, so as to realize cathodic hydrogen evolution and anodic chlorine evolution. The electric flocculation process generally occurring at the anode is transferred to the cathode, a local alkaline environment is generated by utilizing the hydrogen evolution reaction of the cathode, the alkaline corrosion dissolution of a metal electrode is promoted to generate floc dephosphorization, the ammonia nitrogen and COD are removed by coupling with the chlorine evolution process of the anode, and the processes of electric flocculation dephosphorization, electrochemical oxidation denitrification and organic matter removal are simultaneously realized in a single electrolysis system. The system provided by the invention solves the conflict of anode corrosion and inert protection under the requirement of synchronously removing ammonia nitrogen, phosphorus and COD, avoids the invalid hydrogen evolution process of the cathode, maximizes the efficacy of the electrolysis system, realizes high-efficiency removal of pollutants in sewage, and simultaneously realizes higher removal efficiency and simple and convenient operation of the system.
Drawings
FIG. 1 is a schematic diagram of the water treatment system of the present invention.
In the figure, a water inlet 1, a sedimentation tank 2, an electrolytic tank 3, a clean water tank 4, a chemical box 5, a power supply 6, a water outlet 7, a first sedimentation zone 21, a second sedimentation zone 2222, a third sedimentation zone 2828, a sludge collection hopper 23, a sludge outlet valve 24, a first partition plate 25, a second partition plate 26, an inclined plate 27, a water outlet valve 33, a first metering pump 31, a second metering pump 51, a third metering pump 52, a first water level controller 32 and a second water level controller 53.
Detailed Description
The following examples are provided to further illustrate the present invention for better understanding, but the present invention is not limited to the following examples.
Example 1
As shown in figure 1, a water treatment system for synchronously removing N-P-COD in a cathode electrocoagulation and electrooxidation process coupling manner comprises a water inlet 1, a sedimentation tank 2, an electrolytic tank 3, a clean water tank 4, a chemical agent box 5, a power supply 6 and a water outlet 7; the sedimentation tank 2 comprises a first sedimentation zone 21, a second sedimentation zone 22 and a third sedimentation zone 28, the first sedimentation zone 21 and the second sedimentation zone 22 are separated by a first partition plate 25, the second sedimentation zone 22 and the third sedimentation zone 28 are separated by a second partition plate 26, the bottoms of the first partition plate 25 and the second partition plate 26 are both arranged in a non-closed manner with the bottom of the sedimentation tank 2, the first sedimentation zone 21, the second sedimentation zone 22 and the third sedimentation zone 28 are communicated with the bottom of the sedimentation tank 2 through gaps between the first partition plate 25 and the second partition plate 26, an inclined plate 27 is arranged in the area of the second sedimentation zone 22, and a sludge collection hopper 23 and a sludge discharge valve 24 are arranged at the bottom of the sedimentation tank 2. The electrolytic cell 3 is positioned above the sedimentation tank 2 and is communicated with the first sedimentation zone 21 through a pipeline, a water outlet valve 33 is arranged on the pipeline, the bottom of the electrolytic cell 3 is in a slope shape, and the water outlet valve 33 is arranged at the lowest part of the slope and is communicated with the left side 22 of the sedimentation zone through a metering valve; the clean water tank 4 is communicated with the third sedimentation area 28 through a pipeline, and the clean water tank 4 is provided with a water outlet 7; clean water basin 4 passes through the pipeline and communicates with electrolytic cell 3, and chemical tank 5 sets up between clean water basin and electrolytic cell 3, chemical tank 5 one side is through count third pump 52 and electrolytic cell 3 intercommunication, and the opposite side passes through second measuring pump 51 and clean water basin 4 intercommunication. The first water level controller 32 is provided in the electrolytic cell 3, and the second water level controller 53 is provided in the chemical tank 5. A communication pipeline is additionally arranged between the electrolytic cell 3 and the clean water tank 4, and a first metering pump 31 is arranged.
When the device is used, a sodium chloride solution is filled in the electrolytic cell 3, after the device is powered on, chlorine generated on the surface of the anode is dissolved in water to form sodium hypochlorite, flocs are generated on the metal cathode, an active solution generated in the electrolytic cell 3 enters the first settling zone 21 through the water outlet valve 33, sewage to be treated enters the first settling zone 21 through the water inlet 1 and reacts with the active solution flowing out of the electrolytic cell 3, the mixed water body upwards enters the second settling zone 22 through counter-current flow, the rising speed is 2-3mm/s, the generated precipitated sludge is settled on the inclined plate 27, precipitates can be rapidly settled and settled in the sludge collecting hopper 23 at the bottom, the sludge collecting hopper is V-shaped, and the precipitated sludge is intermittently discharged through the sludge outlet valve 24 after being accumulated to a certain degree. The second settling zone 22 uses a second baffle plate 26 to block floating objects, and clear water enters the clear water tank 4 through a pipeline and is discharged through the water outlet 7; the chemical agent added into the chemical agent box 5 is a saturated sodium chloride aqueous solution, after a sodium chloride chemical is added into the chemical agent box 5, clean water in the clean water tank 4 is extracted by the second metering pump 51 and enters the chemical agent box 5 to prepare the saturated sodium chloride aqueous solution, and clean water in the clean water tank 4 is extracted by the third metering pump 52 and the first metering pump 31 and flows to the electrolytic cell 3 together to supplement electrolyte required by the electrolytic cell 3.
Specifically, the electrolytic cell 3 is internally provided with a metal cathode and an anode, in this embodiment, the metal cathode is an aluminum plate, the anode is a stable anode with a DSA scale, in other embodiments, other metal cathodes and anodes can be selected, the thickness of the electrodes is 2-5mm, the electrode distance is 0.5-3.0cm, the sodium chloride solution in the chemical tank 5 supplements and maintains the electrolyte concentration in the electrolytic cell 3 to be 0.1-2mol/L, and the electrode distance and the electrolyte concentration can influence the electro-oxidation, the electro-flocculation effect and the energy consumption in the electrolytic cell 3. The anode generates chlorine evolution reaction, and the generated chlorine gas is combined with water to form hypochlorite, so that ammonia nitrogen can be oxidized into nitrogen and part of organic matters can be removed. The cathode generates hydrogen evolution reaction to cause local alkalinity to rise, so that the aluminum plate is promoted to generate alkaline corrosion to generate floc, and phosphorus is removed through the actions of rolling, sweeping, adsorption, flocculation and sedimentation. In order to achieve the optimal process treatment effect of the device, the distance between the polar plates, the current density, the electrolyte concentration, the electrolysis interval time and the like are required to be adjusted according to the water quality characteristics of the sewage to be treated. In other embodiments, the metal cathode can also be a magnesium plate or a zinc plate; the anode can also be any one of a platinized titanium anode, a boron-doped diamond electrode and a graphite electrode.
Example 2
The water treatment system of example 1 was used to treat landfill leachate from a landfill. Sodium chloride solids are added to the kit 5,then the second metering pump 51 is opened, liquid is added into the chemical box to prepare saturated sodium chloride solution, then the second metering pump 51 is closed, the first metering pump 31 of the electrolytic cell 3 and the third metering pump 52 of the chemical box 5 are opened, when the electrolyte is 75 percent of the total capacity of the electrolytic cell 3, the direct current power supply 6 is opened, and the current density is adjusted to be 80mA/cm 2 And opening a water outlet valve 33 of the electrolysis area at intervals of 15min, replenishing electrolyte in the electrolytic cell, wherein the total electrolysis time is 3h, and the retention time of the landfill leachate is 3 h. The quality and treatment effect of the wastewater are shown in Table 1.
TABLE 1 COD and NH before and after Sewage treatment 4 + -N、PO 4 3- And pH change
Garbage leachate COD NH 4 + -N PO 4 3- pH
Concentration (mg/L) 2364 2238.0 10.64 6.88
Residual concentration (mg/L) 204 55.31 1.14 8.10
Removal Rate (%) 91.57 97.75 89.33 /
As can be seen from the data in the table above: the landfill leachate of certain landfill treated by the system respectively removes 91.57 percent, 97.75 percent and 89.33 percent of COD, ammonia nitrogen and total phosphorus, and the pH value of the solution rises from 6.88 and is stabilized at about 8.10. The system can synchronously realize the high-efficiency removal of nitrogen, phosphorus and COD in the wastewater.
While the foregoing is directed to the preferred embodiment of the present invention, other and further embodiments of the invention may be devised without departing from the basic scope thereof, and the scope thereof is determined by the claims that follow.

Claims (10)

1. A water treatment system for synchronously removing N-P-COD in a cathode electrocoagulation and electrooxidation process coupling manner is characterized in that: the bag is water inlet, sedimentation system, clean water basin and the delivery port that communicates in proper order, the sedimentation system includes electric connection's metal negative pole and positive pole, and during operation, the interior electrolyte of sedimentation system is the solution that contains sodium chloride.
2. The coupled cathodic electrocoagulation and electrooxidation process water treatment system for simultaneous removal of N-P-COD of claim 1, wherein: the sedimentation system comprises an electrolytic device and a sedimentation tank which are communicated with each other, the electrolytic device comprises an electrolytic tank, a metal cathode and a ruler anode which are arranged in the electrolytic tank, and a water outlet of the electrolytic tank is communicated with the sedimentation tank.
3. The coupled cathode electrocoagulation and electrooxidation process water treatment system for synchronous removal of N-P-COD according to claim 1, wherein: the metal cathode is any one of an aluminum plate, a magnesium plate and a zinc plate; the anode is any one of a DSA (dimensionally stable anode), a platinized titanium anode, a boron-doped diamond electrode and a graphite electrode.
4. The coupled cathodic electrocoagulation and electrooxidation process water treatment system for simultaneous removal of N-P-COD of claim 2, wherein: and a water outlet valve is arranged at the water outlet of the electrolytic cell.
5. The coupled cathodic electrocoagulation and electrooxidation process water treatment system for simultaneous removal of N-P-COD of claim 2, wherein: the clean water tank is communicated with the electrolytic cell through a pipeline, and a chemical box is arranged between the clean water tank and the electrolytic cell.
6. The coupled cathodic electrocoagulation and electrooxidation process water treatment system for simultaneous removal of N-P-COD of claim 5, wherein: and water level controllers are arranged in the chemical box and the electrolytic cell.
7. The coupled cathodic electrocoagulation and electrooxidation process water treatment system for simultaneous removal of N-P-COD of claim 2, wherein: the sedimentation tank is divided into a first sedimentation area, a second sedimentation area and a third sedimentation area which are arranged side by two partition plates, the bottom of each partition plate and the bottom of the sedimentation tank are arranged in a non-closed mode, the first sedimentation area is communicated with the electrolytic tank, and the third sedimentation area is communicated with the clean water tank.
8. The cathode electrocoagulation and electrooxidation process coupled water treatment system for simultaneous removal of N-P-COD of claim 7, wherein: and a plurality of inclined plates which are arranged in parallel are arranged in the second settling zone.
9. The coupled cathodic electrocoagulation and electrooxidation process water treatment system for simultaneous removal of N-P-COD of claim 2, wherein: the bottom of the sedimentation tank is provided with a V-shaped hopper.
10. The coupled cathodic electrocoagulation and electrooxidation process water treatment system for simultaneous removal of N-P-COD of claim 2, wherein: when the electrolytic cell works, the concentration of sodium chloride in the electrolytic cell is 0.1-2 mol/L.
CN202210306018.9A 2022-03-25 2022-03-25 Water treatment system for synchronously removing N-P-COD (nitrogen-phosphorus-oxygen demand) in cathode electrocoagulation and electrooxidation process coupling Pending CN114873696A (en)

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CN106044964A (en) * 2016-08-03 2016-10-26 江苏商达水务有限公司 Electrolytic reaction tank for improving nitrogen and phosphorus removal effect of bio-filter system and method for nitrogen and phosphorus removal
CN106915802A (en) * 2017-04-12 2017-07-04 哈尔滨工业大学 The integral type electrochemical reaction appts and processing method of organic wastewater with difficult degradation thereby treatment
CN107055889A (en) * 2017-07-03 2017-08-18 辽宁科技学院 A kind of marine culture wastewater efficient electrolysis denitrification dephosphorization apparatus and method
CN109970158A (en) * 2019-04-08 2019-07-05 北京逸智联科技有限公司 A kind of electrochemistry sewage disposal system
CN114212862A (en) * 2021-09-29 2022-03-22 哈尔滨工业大学 Electric flocculation oxidation integrated wastewater treatment device and treatment method

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