A cleaning wastewater treatment system and treatment method based on advanced oxidation technology

Abstract

The present invention discloses a cleaning wastewater treatment system based on advanced oxidation technology and a treatment method thereof. The cleaning wastewater treatment system includes a wastewater collection unit, an electrochemical oxidation unit, a solid-liquid separation unit, a filtration adsorption unit and a water quality measurement unit. The treatment method uses "electrochemical regulation coupled Fenton oxidation + mud-water separation + membrane separation + adsorption filtration combined process" as an integrated technology, which greatly reduces the concentration of pollutants in the wastewater through electrochemical regulation coupled Fenton oxidation technology, and ensures the stable operation of the subsequent membrane treatment system. At the same time, membrane separation technology and adsorption filtration technology as wastewater deep processes will further remove various pollutants in the wastewater, providing multiple guarantees to ensure that the wastewater can meet the discharge standards.

Description

Technical Field

[0001] The present invention relates to the technical field of chemical wastewater, and in particular to a cleaning wastewater treatment system based on advanced oxidation technology and a treatment method thereof. Background Art

[0002] Regarding the treatment of cleaning waste liquid, the relevant treatment technologies at home and abroad are mainly divided into four categories: physical treatment, chemical treatment, physicochemical treatment and biological treatment. Among them, the physical treatment method is a method of separating and removing insoluble suspended pollutants in sewage through physical action, mainly including sedimentation, filtration, adsorption and membrane separation. The chemical treatment method is a method of separating and removing pollutants in dissolved and colloidal states in sewage or converting them into harmless substances through chemical reactions and mass transfer, mainly including acid-base neutralization, oxidation-reduction, chemical precipitation, coagulation precipitation, ion exchange, electrocatalytic oxidation, photocatalytic oxidation and ultrasonic degradation. The physicochemical treatment method is a sewage treatment system composed of physical and chemical methods, which uses the combined effects of physics and chemistry to purify sewage. The biological treatment method uses the metabolic action of microorganisms to convert organic pollutants in dissolved and colloidal states in sewage into harmless substances to achieve water purification.

[0003] Among the above methods, chemical precipitation, evaporation, ion exchange, etc. have been applied on a large scale on the ground. Deep biochemical disinfection waste liquid treatment technologies such as membrane treatment are currently mostly in the laboratory research stage. Emerging technologies such as advanced oxidation are rarely studied.

[0004] The electrochemically regulated coupled Fenton oxidation technology is a further improvement and optimization of the performance based on the general chemical oxidation technology, which improves the reaction efficiency, optimizes the reaction parameters, reduces the residue production, and reduces the operating cost. This technology gives full play to the synergistic effect of the cathode and anode. The molecular / atomic oxygen produced by the anode is super-dissolved and supersaturated, and the diffusion to the cathode is strongly promoted to achieve the electro-Fenton oxidation of oxygen in situ, which can greatly improve the oxidation efficiency. The electrochemically regulated coupled Fenton oxidation technology solves the problem of Fenton oxidation stagnation. This is because the low molecular weight organic acids produced by Fenton oxidation react with Fe 3+ Complexation causes ion imbalance in water, slowing down or stagnating Fenton oxidation. By coupling with electrochemical oxidation, the complexed Fe 3+ At the cathode, Fe 2+ , to achieve continuous electro-Fenton oxidation. Summary of the invention

[0005] The purpose of the present invention is to provide a cleaning wastewater treatment system based on advanced oxidation technology to address the technical defects in the prior art.

[0006] Another object of the present invention is to provide a method for treating disinfection wastewater based on advanced oxidation technology.

[0007] The technical solution adopted to achieve the purpose of the present invention is:

[0008] A cleaning wastewater treatment system based on advanced oxidation technology, comprising a water collection bag, an electrode reactor, a filter press, a bag filter and an activated carbon tank, and connecting pipes between the components;

[0009] A first pipeline mixer is provided on the pipeline between the water collecting bag and the electrode reactor; a hydrogen peroxide dosing tank and a sodium hydroxide dosing tank are provided on the first pipeline mixer to add hydrogen peroxide and sodium hydroxide to the wastewater; a water inlet pump is provided in the water collecting bag to pump the wastewater in the water collecting bag into the electrode reactor for advanced oxidation;

[0010] A circulating water pump is provided between the electrode reactor and the filter press; a second pipeline mixer is provided on the pipeline between the electrode reactor and the filter press; a PAM dosing tank is provided on the second pipeline mixer to add flocculants to the wastewater after advanced oxidation; the wastewater after advanced oxidation is mixed with the flocculant under the action of the circulating water pump to cause flocculation and precipitation, and then pumped into the filter press for solid-liquid separation;

[0011] A lifting pump is arranged between the water outlet of the filter press and the bag filter to pump the wastewater after solid-liquid separation into the bag filter and the activated carbon tank for filtration and adsorption.

[0012] In the above technical solution, metering pumps are installed on the hydrogen peroxide dosing tank, the sodium hydroxide dosing tank and the PAM dosing tank respectively.

[0013] In the above technical solution, the water outlet of the water collecting bag is connected to the water inlet of the electrode reactor through a water inlet pipe; the water return port of the water collecting bag is connected to the water outlet of the electrode reactor through a water return pipe; the water inlet pipe and the water return pipe form a first circulation loop between the water collecting bag and the electrode reactor.

[0014] In the above technical solution, a fourth three-way valve and a fifth three-way valve are respectively installed on one end of the water inlet pipe and the water return pipe close to the electrode reactor; the fourth three-way valve and the fifth three-way valve are connected through a circulation pipe; the water inlet pipe, the fourth three-way valve, the circulation pipe, the fifth three-way valve, and the return pipe form a second circulation loop between the water outlet and the water inlet of the water collecting bag.

[0015] In the above technical scheme, it also includes a circulating water bag; the circulating water pump is arranged in the circulating water bag; a first three-way valve is installed on the water inlet pipe; a second three-way valve is installed on the return water pipe; the water outlet of the circulating water bag is connected to the first three-way valve through a circulating water inlet pipe; the water inlet of the circulating water bag is connected to the second three-way valve through a circulating water return pipe; the circulating water inlet pipe, the first three-way valve, the water inlet pipe, the electrode reactor, the return water pipe, and the circulating water return pipe form a third circulation loop between the water outlet and the water inlet of the circulating water bag.

[0016] In the above technical solution, a residue bag is provided at the mud outlet of the filter press.

[0017] In the above technical solution, a first liquid level gauge is arranged in the water collecting bag; a second liquid level gauge is arranged in the circulating water bag; and a third liquid level gauge is arranged in the filter press.

[0018] In the above technical solution, it also includes a buffer water bag; the buffer water bag is connected to the water outlet of the activated carbon tank through a fourth transfer pipe.

[0019] In the above technical solution, a third three-way valve is installed on the fourth transfer pipeline; the third three-way valve is connected to the filter press through a re-filtration pipeline.

[0020] In the above technical solution, it also includes a water quality measuring unit; the water quality measuring unit is connected to the water outlet of the activated carbon tank.

[0021] In the above technical solution, the water quality measurement unit includes a COD electrode, a BOD5 electrode, a SS electrode, a pH electrode and an anionic surfactant detector.

[0022] In another aspect of the present invention, the treatment method of the above-mentioned cleaning wastewater treatment system comprises the following steps:

[0023] Step 1: Collect wastewater in a water collection bag and add sodium bisulfite and defoaming agent for preliminary reduction;

[0024] Step 2: Add ferrous sulfate and hydrogen peroxide and perform advanced oxidation treatment through an electrode reactor for 20-30 minutes;

[0025] Step 3: The pH of the wastewater after advanced oxidation treatment is adjusted to 8-9, and PAC powder is added and stirred;

[0026] Step 4: adding a flocculant to the wastewater after adjusting the pH to perform flocculation and precipitation, and then performing solid-liquid separation through a filter press;

[0027] Step 5: After solid-liquid separation, the wastewater is filtered through a bag filter to remove suspended solids, and then the organic / inorganic impurities in the wastewater are removed by adsorption through an activated carbon tank.

[0028] In the above technical solution, step 6 is also included: the water quality measurement unit detects the wastewater discharged from the activated carbon tank;

[0029] When the discharge standard is met, the wastewater treated by the activated carbon tank enters the buffer water bag and is then discharged;

[0030] When the emission standards are not met, the wastewater treated by adsorption in the activated carbon tank is returned to the filter press for further filtration and adsorption treatment.

[0031] In the above technical scheme, in step 2, after the water collection bag completes water collection, the water inlet pump is started, and a certain amount of solid ferrous sulfate is added to allow the wastewater to circulate in the second circulation loop for 5-10 minutes; then hydrogen peroxide is added, and the fourth three-way valve and the fifth three-way valve are controlled to allow the wastewater to circulate in the first circulation loop; finally, the electrode reactor is turned on for advanced oxidation treatment.

[0032] Compared with the prior art, the present invention has the following beneficial effects:

[0033] The method for treating disinfection wastewater based on advanced oxidation technology provided by the present invention takes "electrochemical regulation coupled Fenton oxidation + mud-water separation + membrane separation + adsorption filtration combined process" as an integrated technology. The concentration of pollutants in the wastewater is greatly reduced through electrochemical regulation coupled with Fenton oxidation technology, thereby ensuring the stable operation of the subsequent membrane treatment system. At the same time, membrane separation technology and adsorption filtration technology, as deep wastewater processes, will further remove various pollutants in the wastewater, providing multiple guarantees to ensure that the wastewater can meet discharge standards. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] Figure 1 The figure shows the structural schematic diagram of the cleaning wastewater treatment system;

[0035] Figure 2 Shown is a schematic diagram of a dosing tank;

[0036] Figure 3 Shown is a schematic diagram of the internal structure of the activated carbon canister;

[0037] Figure 4 Shown is a flow chart of the disinfection wastewater treatment method.

[0038] In the figure: 1-water collecting bag, 2-water inlet pump, 3-electrode reactor, 4-first pipeline mixer, 5-circulating water bag, 6-circulating water pump, 7-filter press, 8-residue bag, 9-second pipeline mixer, 10-lifting pump, 11-bag filter, 12-activated carbon tank, 13-buffer water bag, 14-first three-way valve, 15-second three-way valve, 16-third three-way valve, 17-fourth three-way valve, 18-fifth three-way valve, 19-hydrogen peroxide dosing tank, 20-sodium hydroxide dosing tank, 21-metering pump, 22-PAM dosing tank, 23-first liquid level gauge, 24-second liquid level gauge, 25-third liquid level gauge, 26-first valve, 27-water quality measurement unit;

[0039] Inlet pipe L1, return pipe L2, circulating inlet pipe L3, circulating return pipe L4, first transfer pipe L5, second transfer pipe L6, third transfer pipe L7, fourth transfer pipe L8, re-filtration pipe L9, circulating pipe L10. DETAILED DESCRIPTION

[0040] The present invention is further described in detail below in conjunction with specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention and are not used to limit the present invention.

[0041] Example 1

[0042] A cleaning wastewater treatment system based on advanced oxidation technology, such as Figure 1 As shown, it includes a wastewater collection unit, an electrochemical oxidation unit, a solid-liquid separation unit, a filtration adsorption unit and a water quality measurement unit 27.

[0043] The wastewater collection unit includes a water collection bag 1 and a water inlet pump 2; the electrochemical oxidation unit includes an electrode reactor 3, a first pipeline mixer 4, a circulating water bag 5 and a circulating water pump 6; the solid-liquid separation unit includes a filter press 7, a residue bag 8 and a second pipeline mixer 9; the filtration adsorption unit includes a lifting pump 10, a bag filter 11, an activated carbon tank 12 and a buffer water bag 13.

[0044] The water outlet of the water collection bag 1 is connected to the water inlet of the electrode reactor 3 through the water inlet pipe L1; the water return port of the water collection bag 1 is connected to the water outlet of the electrode reactor 3 through the water return pipe L2. The water inlet pump 2 is a stainless steel submersible pump, which pumps the wastewater inside the water collection bag 1 into the electrode reactor 3 through the water inlet pipe L1. The water inlet pipe L1 and the water return pipe L2 form a first circulation loop between the water collection bag 1 and the electrode reactor 3.

[0045] The first pipeline mixer 4 is arranged on the return water pipeline L2; a hydrogen peroxide dosing tank 19 and two sodium hydroxide dosing tanks 20 are installed on the first pipeline mixer 4; and metering pumps 21 are installed on the hydrogen peroxide dosing tank 19 and the sodium hydroxide dosing tank 20, respectively.

[0046] The fourth three-way valve 17 and the fifth three-way valve 18 are respectively installed on the ends of the water inlet pipe L1 and the water return pipe L2 close to the electrode reactor 3; the fourth three-way valve 17 and the fifth three-way valve 18 are connected through the circulation pipe L10; the water inlet pipe L1, the fourth three-way valve 17, the circulation pipe L10, the fifth three-way valve 18, and the return pipe L2 form a second circulation loop between the water outlet and the water inlet of the water collecting bag 1.

[0047] A first three-way valve 14 is installed on the water inlet pipe L1; a second three-way valve 15 is installed on the return pipe L2; the water outlet of the circulating water bag 5 is connected to the first three-way valve 14 through a circulating water inlet pipe L3; the water inlet of the circulating water bag 5 is connected to the second three-way valve 15 through a circulating water return pipe L4; the circulating water inlet pipe L3, the first three-way valve 14, the water inlet pipe L1, the electrode reactor 3, the return pipe L2, and the circulating water return pipe L4 form a third circulation loop between the water outlet and the water inlet of the circulating water bag 5.

[0048] The water outlet of the circulating water bag 5 is connected to the filter press 7 through the first transfer pipeline L5 to pump the wastewater in the circulating water bag 5 into the filter press 7; the second pipeline mixer 9 is arranged on the first transfer pipeline L5; the first transfer pipeline L5 is equipped with a first valve 26; the second pipeline mixer 9 is equipped with a PAM dosing tank 22; the PAM dosing tank 22 is equipped with a metering pump 21; the residue bag 8 is arranged at the mud outlet of the filter press 7.

[0049] The water outlet of the filter press 7 is connected to the bag filter 11 through the second transfer pipeline L6; the lift pump 10 is arranged on the second transfer pipeline L6 to pump the wastewater flowing out of the filter press 7 into the bag filter 11. The bag filter 11 and the activated carbon tank 12 are connected through the third transfer pipeline L7. The activated carbon tank 12 and the buffer water bag 13 are connected through the fourth transfer pipeline L8; the water quality measurement unit is connected to the fourth transfer pipeline L8 to detect whether the wastewater after adsorption treatment by the activated carbon tank 12 meets the discharge standard; the fourth transfer pipeline L8 is equipped with a third three-way valve 16; when the water quality measurement unit detects that it meets the discharge standard, the third three-way valve 16 is adjusted to allow the wastewater after adsorption treatment by the activated carbon tank 12 to enter the buffer water bag 13 and then be discharged. The third three-way valve 16 is connected to the filter press 7 through the re-filtration pipeline L9. When the water quality determination unit 27 detects that the wastewater does not meet the discharge standard, the third three-way valve 16 is adjusted to allow the wastewater after adsorption treatment by the activated carbon tank 12 to return to the filter press 7 through the re-filtration pipeline L9 for re-filtration and adsorption treatment.

[0050] Example 2

[0051] This embodiment introduces the detailed information of each component based on the embodiment 1.

[0052] The water collection bag 1 is a soft foldable water storage bag, which is mainly used to collect and store disinfection wastewater. The bottom liquid outlet is connected to the inlet of the water pump 2 through a pipeline, which can effectively save the deployment time and withdrawal time. The volume of the water collection bag 1 is designed to be 3m 3 A first liquid level meter 23 is provided for detecting the water level in the water collecting bag 1. When the liquid level in the water collecting bag 1 exceeds the control line, the water inlet pump 2 stops to prevent idling.

[0053] The function of the water inlet pump 2 is to pump the disinfection wastewater collected in the water collection bag 1 into the electrochemical oxidation unit. In order to facilitate the transportation of the residual liquid at the bottom of the water collection bag 1, the water inlet pump 2 is a stainless steel submersible pump connected to the vehicle system through a hose. The flow rate of the water inlet pump 2 is ≥10m 3 / h, head ≥54m, with anti-dry burning function, using anti-corrosion materials or after anti-corrosion treatment.

[0054] The electrode reactor 3 is the core equipment of the electrochemical oxidation unit, responsible for oxidizing and degrading organic matter in the wastewater, especially the easily degradable short-chain organic matter. The electrode anode area of ​​the electrode reactor 3 is designed to be 10m 2 , the anode area of ​​a single set of electrodes is 5m 2, a total of two groups are set. Two groups of electrodes are embedded in the electrode reactor 3, and its overall dimensions are 1000×700×1000mm. The electrode reactor 3 adopts a bottom-in and top-out mode, the electrode plate is placed horizontally, and 4 wiring electrodes are arranged on one side of the short side of the reactor. A drainage port is provided at the bottom of the electrode reactor 3. According to the electrode area, current and wastewater conductivity, the supporting power supply is designed to be a low-voltage, high-current DC constant current power supply with a current of 0 to 1000A and a voltage of 0 to 15V. The actual working current is about 500A and the voltage is about 4V. Considering the fan and other losses, the maximum input power of the power supply is set to 5kW.

[0055] The first pipeline mixer 4 adopts a static mixing method to fully mix the added hydrogen peroxide with the wastewater to improve the oxidizability of the wastewater.

[0056] The circulating water bag 5 is a soft foldable water storage bag, and its bottom outlet is connected to the inlet of the circulating water pump 6 through a pipeline, which can effectively save the deployment time and the withdrawal time. The volume of the circulating water bag 5 is designed to be 3m 3 A second liquid level meter 24 is provided for detecting the water level in the circulating water bag 5. When the liquid level in the circulating water bag 5 exceeds the control line, the circulating water pump 6 stops to prevent idling.

[0057] The function of the circulating water pump 6 is to pump the outlet water of the electrode reactor 3 into the filter press 7. In order to facilitate the transportation of the residual liquid at the bottom of the circulating water bag 5, the circulating water pump 6 is a stainless steel submersible pump connected to the vehicle system through a hose. The flow rate of the circulating water pump 6 is ≥15m 3 / h, head ≥16m, with anti-dry burning function, using anti-corrosion materials or after anti-corrosion treatment.

[0058] The filter press 7 is in the form of a stacked screw filter press, with a weight of no more than 1000kg, and the solid-liquid separation is in the form of continuous feeding screw extrusion solid-liquid separation. It has a moderate volume and a moderate feed amount, and is suitable for separating organic mud with larger solid particles, and the moisture content of the formed residue is about 70%. The water tank of the filter press 7 is equipped with a third liquid level gauge 25, which is used to monitor the water level in the filter press 7 and control the water inlet of the filter press 7. When the water level of the filter press 7 exceeds the limit, the first valve 26 is closed and the water inlet is automatically stopped.

[0059] The mud outlet of the filter press 7 is equipped with a waterproof ton bag as a residue bag 8. The residue bag 8 is made of PP, white, 4 slings, flat bottom with sealing cloth, plus an inner film, with an outer size of 0.7m long, 0.7m wide, and 0.8m high, and the mouth has an anti-spill design.

[0060] The second pipeline mixer 9 adopts a static mixing method to fully mix the added PAM with the wastewater to achieve a flocculation effect.

[0061] The function of the lift pump 10 is to pump the outlet water of the filter press 7 into the bag filter 11. The lift pump 10 has a flow rate of ≥15m3 / h, a head of ≥16m, has an anti-dry burning function, and is made of anti-corrosion materials or has undergone anti-corrosion treatment.

[0062] The bag filter 11 is made of PP and is immersed in use. It has the characteristics of low energy consumption, mild separation conditions, convenient operation, compact structure, simple maintenance, and easy automation. It can effectively remove suspended solids in water and provide a solid foundation for subsequent treatment. The outer shell of the bag filter 11 is made of stainless steel plate bent and welded. The inlet is connected to the lifting pump 10, the outlet is connected to the activated carbon tank 12, and a drain port is provided at the bottom.

[0063] The activated carbon tank 12 uses the activated carbon adsorbent filled to remove organic and inorganic impurities in the waste liquid. The effective volume of the activated carbon tank 12 device is 1.2m 3 , wherein the activated carbon adsorbent loading amount is designed to be 570 kg. In order to effectively utilize the space, the activated carbon tank 12 is designed as a combination of multiple small filters, such as Figure 4 The tank is made of resin, which is light and easy to replace.

[0064] The water quality measuring unit 27 is composed of a COD electrode, a BOD5 electrode, a SS electrode, a pH electrode and an anionic surfactant (LAS) detector, and can perform online detection of the chemical oxygen demand (COD), biochemical oxygen demand (BOD5), suspended solids (SS), pH and anionic surfactant (LAS) indicators of the effluent.

[0065] Among them, the COD electrode and BOD5 electrode use RS485 communication interface and standard Modbus protocol, come with a cleaning brush, can simultaneously measure the absorbance of water at 254nm and 546nm, and can be converted into BOD and COD, and can quickly respond to possible changes in water quality at the outlet. The pH electrode uses RS485 communication interface and standard Modbus protocol, built-in PT100 temperature sensor and compensation algorithm, and can quickly respond to possible changes in water quality at the outlet. The SS electrode uses RS485 communication interface and standard Modbus protocol, comes with a cleaning brush, uses an infrared light source, is not affected by the chromaticity of the water sample, uses a 90° scattering method, and complies with ISO 7027 international standards and USEPA 180.1 American environmental protection standards. The anionic surfactant (LAS) detector can achieve fast measurement and easy operation, and the measurement time interval can be less than 10 minutes; the overall equipment is a portable aluminum box with built-in vibration reduction and thermal insulation pads. The reagents and spare parts in the box can meet the detection needs of 30 times, and devices such as cuvettes can be reused repeatedly; the equipment provides external power supply and communication interfaces to ensure reliable connection for fixed wiring methods; the equipment communicates with PLC through RS485 / RJ45 / RS232 and other interface forms, and can realize online measurement of parameters. It has a wide detection range and a wide operating temperature range. It can be stored in extreme environments and has the ability to resist vibration and impact.

[0066] There are 4 metering pumps 21 in the system, which are respectively installed on the hydrogen peroxide dosing tank 19, two sodium hydroxide dosing tanks 20 and the PAM dosing tank 22. The metering pumps 21 are all quantitative corrosion-resistant diaphragm pumps with adjustable flow rates, which can extract liquid from the dosing tank through a plastic hose for automatic dosing, and the maximum dosing flow rate is not less than 150L / h.

[0067] Example 3

[0068] A method for treating disinfection wastewater based on advanced oxidation technology, such as Figure 4 As shown, the following steps are included:

[0069] Step 1: Collect and restore wastewater

[0070] First, put the weighed sodium bisulfite solid into the water collection bag 1, open the valve to allow the waste liquid to enter the water collection bag 1; then spray the pre-made defoamer on the surface of the waste liquid until there is no obvious foam. In the later stage of the test, spray the defoamer at any time.

[0071] Step 2: After the water collection bag 1 has completed collecting water, the water inlet pump 2 is started, and a fixed amount of solid ferrous sulfate is added; the first three-way valve 14, the second three-way valve 15, the fourth three-way valve 17 and the fifth three-way valve 18 are controlled to allow the wastewater to circulate in the second circulation loop for 5 minutes;

[0072] Step 3: Start the hydrogen peroxide dosing tank 19, add hydrogen peroxide through the metering pump 21, and after the hydrogen peroxide is mixed with the wastewater through the first pipeline mixer 4, control the fourth three-way valve 17 and the fifth three-way valve 18 to circulate the wastewater in the first circulation loop. Start the electrode reactor 3 and adjust the current to 500A. After reacting for 20 minutes, turn off the electrode reactor 3 and the water inlet pump 2.

[0073] Step 4: After the reaction is completed, the first three-way valve 14 and the second three-way valve 15 are controlled, and the circulating water pump 6 is opened to circulate the wastewater after the reaction in the third circulation loop; the sodium hydroxide dosing tank 20 is started to add sodium hydroxide, and the sodium hydroxide is mixed with the wastewater through the first pipeline mixer 4 until the wastewater is adjusted to pH 8-9, and PAC powder is manually added quantitatively and stirred evenly.

[0074] Step 5: Control the first three-way valve 14 to disconnect the circulating water inlet pipeline L3 from the water inlet pipeline L1, open the first valve 26 to connect the circulating water inlet pipeline L3 with the first transfer pipeline L5, and the circulating water pump 6 pumps the wastewater after pH adjustment into the filter press 7; during the process, start the PAM dosing tank 22, and add a certain amount of flocculant through the metering pump 21; the wastewater and flocculant flocculate and precipitate in the second pipeline mixer 9, and then enter the filter press 7 for solid-liquid separation;

[0075] Step 6: The separated residue enters the residue bag 8 for collection, and the wastewater is first pumped into the bag filter 11 through the second transfer pipeline L6 under the action of the lift pump 10 to remove the suspended solids in the wastewater, and then enters the activated carbon tank 12 through the third transfer pipeline L7 to remove the organic / inorganic impurities in the wastewater by adsorption;

[0076] Step 7: The water quality determination unit takes a sample at the outlet of the activated carbon tank 12 and detects whether the wastewater after adsorption treatment meets the discharge standard; when the water quality determination unit detects that it meets the discharge standard, the third three-way valve 16 is adjusted to allow the wastewater after adsorption treatment of the activated carbon tank 12 to enter the buffer water bag 13 and then be discharged. When the water quality determination unit detects that it does not meet the discharge standard, the third three-way valve 16 is adjusted to allow the wastewater after adsorption treatment of the activated carbon tank 12 to return to the filter press 7 through the re-filtration pipeline L9; and perform re-filtration and adsorption treatment.

[0077] The above is only a preferred embodiment of the present invention. It should be pointed out that, for ordinary technicians in this technical field, several improvements and modifications can be made without departing from the principle of the present invention. These improvements and modifications should also be regarded as the scope of protection of the present invention.

Claims

1. A method for treating decontamination wastewater, the method using a decontamination wastewater treatment system based on advanced oxidation technology, characterized in that: The cleaning wastewater treatment system includes a water collection bag, an electrode reactor, a filter press, a bag filter and an activated carbon tank; A first pipeline mixer is provided on the pipeline between the water collecting bag and the electrode reactor; a hydrogen peroxide dosing tank and a sodium hydroxide dosing tank are provided on the first pipeline mixer to add hydrogen peroxide and sodium hydroxide to the wastewater; a water inlet pump is provided in the water collecting bag to pump the wastewater in the water collecting bag into the electrode reactor for advanced oxidation; A circulating water pump is provided between the electrode reactor and the filter press; a second pipeline mixer is provided on the pipeline between the electrode reactor and the filter press; a PAM dosing tank is provided on the second pipeline mixer to add PAM to the wastewater after advanced oxidation; the wastewater after advanced oxidation is mixed with PAM under the action of the circulating water pump to cause flocculation and precipitation, and then pumped into the filter press for solid-liquid separation; A lifting pump is provided between the water outlet of the filter press and the bag filter to pump the wastewater after solid-liquid separation into the bag filter and the activated carbon tank for filtration and adsorption; The hydrogen peroxide dosing tank, the sodium hydroxide dosing tank and the PAM dosing tank are respectively equipped with metering pumps; It also includes a water quality measurement unit; the water quality measurement unit is connected to the water outlet of the activated carbon tank; The water quality determination unit includes a COD electrode, a BOD5 electrode, a SS electrode, a pH electrode and an anionic surfactant detector; The liquid outlet of the water collection bag is connected to the inlet of the water inlet pump through a pipe, and the water outlet of the water inlet pump is connected to the water inlet of the electrode reactor through an inlet pipe; the water return port of the water collection bag is connected to the water outlet of the electrode reactor through a return pipe; the inlet pipe and the return pipe form a first circulation loop between the water collection bag and the electrode reactor; the first pipeline mixer is arranged on the return pipe; A fourth three-way valve and a fifth three-way valve are respectively installed on one end of the water inlet pipe and the water return pipe close to the electrode reactor; the fourth three-way valve and the fifth three-way valve are connected through a circulation pipe; the water inlet pipe, the fourth three-way valve, the circulation pipe, the fifth three-way valve, and the water return pipe form a second circulation loop between the water outlet and the water inlet of the water collection bag; The disinfection wastewater treatment system also includes a circulating water bag; the circulating water pump is arranged in the circulating water bag, and the liquid outlet of the circulating water bag is connected to the inlet of the circulating water pump through a pipeline; a first three-way valve is installed on the water inlet pipeline; a second three-way valve is installed on the return water pipeline; the water outlet of the circulating water pump is connected to the first three-way valve through a circulating water inlet pipeline; the water inlet of the circulating water bag is connected to the second three-way valve through a circulating water return pipeline; the circulating water inlet pipeline, the first three-way valve, the water inlet pipeline, the electrode reactor, the return water pipeline, and the circulating water return pipeline form a third circulation loop between the water outlet and the water inlet of the circulating water bag; The method for treating disinfection wastewater comprises the following steps: Step 1: Collect wastewater in a water collection bag and add sodium bisulfite and defoaming agent into the water collection bag for preliminary reduction; Step 2: After the water collection bag has completed water collection, start the water inlet pump and add a certain amount of solid ferrous sulfate into the water collection bag to make the wastewater circulate in the second circulation loop for 5-10 minutes; then start the hydrogen peroxide dosing tank, add hydrogen peroxide into the first pipeline mixer, control the fourth three-way valve and the fifth three-way valve to make the wastewater circulate in the first circulation loop; finally, start the electrode reactor for advanced oxidation treatment for 20-30 minutes; Step 3: After the advanced oxidation treatment, the first three-way valve and the second three-way valve are controlled to open the circulating water pump to circulate the wastewater after the advanced oxidation treatment in the third circulation loop, the sodium hydroxide dosing tank is started, and sodium hydroxide is added to the first pipeline mixer until the pH of the wastewater is adjusted to 8-9, and PAC powder is added to the wastewater after the pH adjustment for stirring; Step 4: Start the PAM dosing tank and add PAM into the second pipeline mixer. The wastewater treated in step 3 and PAM are flocculated and precipitated in the second pipeline mixer, and then solid-liquid separation is performed by a filter press. Step 5: After solid-liquid separation, the wastewater is filtered through a bag filter to remove suspended solids in the wastewater, and then the organic / inorganic impurities in the wastewater are removed by adsorption through an activated carbon tank; Step 6: The water quality measurement unit detects the wastewater discharged from the activated carbon canister; when it meets the emission standards, the wastewater after adsorption treatment by the activated carbon canister enters the buffer water bag and is then discharged; when it does not meet the emission standards, the wastewater after adsorption treatment by the activated carbon canister is returned to the filter press for further filtration and adsorption treatment.

2. The method for treating disinfection wastewater according to claim 1, wherein: The mud outlet of the filter press is provided with a residue bag.

3. The method for treating disinfection wastewater according to claim 1, characterized in that: A first liquid level gauge is arranged in the water collecting bag; a second liquid level gauge is arranged in the circulating water bag; and a third liquid level gauge is arranged in the filter press.

4. The method for treating disinfection wastewater according to claim 1, characterized in that: It also includes a buffer water bag; the buffer water bag is connected to the water outlet of the activated carbon tank through a fourth transfer pipeline.

5. The method for treating disinfection wastewater according to claim 4, characterized in that: A third three-way valve is installed on the fourth transfer pipeline; the third three-way valve is connected to the filter press through a re-filtration pipeline.

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