High-concentration ether industrial wastewater treatment system

Abstract

The utility model relates to the technical field of industrial wastewater treatment, in particular to a high-concentration ether industrial wastewater treatment system which comprises a mixed wastewater collection tank, a pretreatment system, a comprehensive regulation tank, a hydrolysis acidification tank, a biochemical treatment system and an ozone oxidation tank, the pretreatment system comprises a coagulation air flotation device, a multi-dimensional electro-catalysis device and an electrolytic sedimentation tank which are connected in sequence, the biochemical treatment system comprises an anaerobic treatment unit and an aerobic treatment unit which are connected in sequence, and the ozone oxidation tank is arranged behind the aerobic treatment unit. When the wastewater treatment system is used for treating ether wastewater, stable and up-to-standard discharge of effluent from a water outlet can be ensured, the wastewater treatment efficiency is high, and a novel and effective wastewater treatment method is provided for ether wastewater treatment; compared with a traditional incineration method for treating the high-concentration ether wastewater, the method has the advantages that the equipment operation cost is low, operation management is simple, equipment faults are not prone to occurring, and secondary pollution is small.

Description

Technical Field

[0001] The utility model relates to the technical field of industrial wastewater treatment, in particular to a high-concentration ether industrial wastewater treatment system. Background Art

[0002] The wastewater from the photocuring coating industry contains high-concentration ether wastewater such as ethylene glycol monoallyl ether, hydroxybutyl vinyl ether, and cyclohexyl vinyl ether. This type of wastewater has complex components, high salt content, and COD as high as 100,000 mg / L. There are the following technical difficulties in treating the wastewater: 1. Difficulty in biological degradation: ether compounds are usually biologically inert and have a strong inhibitory effect on microorganisms. Conventional biochemical treatment methods (such as activated sludge method) are difficult to effectively degrade ether pollutants in this type of wastewater; 2. Biological toxicity: Even at lower concentrations, it may have toxic effects on the microbial community in the treatment process and affect the stability of the biochemical system; 3. Low treatment efficiency: Since ether substances are not easily transformed by microorganisms, conventional biochemical treatment processes have poor treatment effects.

[0003] Therefore, incineration is usually used to treat ether wastewater. The specific process of incineration is: first, use a filter to remove fine suspended matter and enter the homogenization tank; after the wastewater is pressurized, it is sprayed into the secondary combustion chamber through a spray gun to fully burn harmful organic matter in the flue gas; the high-temperature flue gas generated in the secondary combustion chamber enters the waste heat boiler to recover part of the energy to generate steam; the flue gas temperature drops to between 500℃-600℃ after passing through the waste heat boiler, and then passes through the flue gas quenching tower to reduce the temperature to between 200℃-180℃ to avoid the re-synthesis of toxic gases such as dioxins; finally, after activated carbon adsorption, dust removal, denitrification and desulfurization, the flue gas is sent into the chimney through the induced draft fan to meet strict flue gas emission standards and then discharged into the atmosphere.

[0004] However, the above method still has the following shortcomings in actual use: 1. The combustion method has high requirements for wastewater viscosity, which can easily cause problems such as nozzle clogging, corrosion or scaling in the burner during treatment, reducing the atomization effect of the nozzle, and thus leading to unstable removal rate; 2. The wastewater contains high salt, sulfur, nitrogen and other elements, which will form molten salts during the combustion process to damage the combustion equipment or produce gases such as SO2, SO3, and NO2, which have high requirements for flue gas treatment equipment, and high construction and operating costs. Based on this, the present application provides a high-concentration ether industrial wastewater treatment system, which has the advantages of low construction cost, simple operation and management, and low secondary pollution compared to the traditional incineration method, and the treated effluent can be stably discharged up to standard. Utility Model Content

[0005] The utility model provides a high-concentration ether industrial wastewater treatment system, which can solve the technical problems of easy equipment failure and secondary pollution in the existing ether wastewater treatment system.

[0006] This application provides the following technical solutions:

[0007] A high-concentration ether industrial wastewater treatment system includes a mixed wastewater collection tank, a pretreatment system, a comprehensive regulating tank, a hydrolysis acidification tank, a biochemical treatment system and an ozone oxidation tank. The pretreatment system includes a coagulation flotation device, a multi-dimensional electrocatalytic device and an electrolytic sedimentation tank connected in sequence. The biochemical treatment system includes an anaerobic treatment unit and an aerobic treatment unit connected in sequence. The ozone oxidation tank is arranged after the aerobic treatment unit.

[0008] Beneficial effects:

[0009] 1. Since ether wastewater has certain biological toxicity and difficulty in degradation, this application sets up a pretreatment system before biochemical treatment, and uses the multidimensional electrocatalytic device in the pretreatment system to cause the wastewater to undergo redox reaction, thereby breaking the long chains of macromolecular ethers, improving the biodegradability and treatment efficiency of subsequent wastewater, and laying the foundation for subsequent biochemical treatment; experimental verification shows that the COD removal rate of wastewater after multidimensional electrocatalysis and electrolytic precipitation treatment is 20%, and the multidimensional electrocatalytic reaction conditions are relatively mild, without the need to add additional chemical oxidants.

[0010] 2. By setting up a hydrolysis acidification tank, macromolecules such as ethers can be further decomposed into small molecules such as carboxylic acids and alcohols, further improving the overall biodegradability. The COD removal rate of wastewater after hydrolysis acidification treatment is 50%.

[0011] 3. The ozone oxidation tank is used as a supplement to multi-dimensional electrocatalysis and hydrolysis acidification to ensure that the final wastewater discharge is stable and meets the standards; and the ozone oxidation tank is set after the aerobic treatment unit. Compared with the traditional method of placing ozone oxidation before the anaerobic treatment unit, this application can reduce the loss of ozone to anaerobic bacteria, and reduce the problem that certain intermediate substances produced by ozone oxidation may inhibit the activity of anaerobic bacteria.

[0012] Furthermore, anode plates and cathode plates are alternately arranged in the multi-dimensional electrocatalytic device. The anode plates are titanium substrates with a coating, and the cathode plates are stainless steel substrates. The thickness of the anode plates and cathode plates is 2-4 mm.

[0013] Beneficial effect: The thickness of the anode plate and the cathode plate is set to 2-4mm, which can not only ensure the electrocatalytic efficiency but also reduce the cost of use. When the thickness of the two plates is less than 2mm, the electrocatalytic efficiency is greatly reduced. When the thickness of the plates is greater than 4mm, the cost of use is greatly increased, but the electrocatalytic efficiency is not greatly improved, which is not economical.

[0014] Furthermore, the coating is a ruthenium-iridium coating with a coating thickness of 3-5 um.

[0015] Beneficial effects: The ruthenium-iridium coating on the anode plate has strong corrosion resistance, and the ruthenium-iridium coating has excellent catalytic activity, which can effectively accelerate the oxidation reaction process; secondly, the ruthenium-iridium coating can also maintain good structural integrity and extend the service life of the electrode; in addition, after the ruthenium-iridium coating is provided on the titanium substrate, not only a sufficient catalytic active layer can be obtained, but also the bonding force between the coating and the substrate is strong, which can resist the stress changes in the electrochemical process and is not easy to peel off; finally, the thickness of the coating is set at 3-5um, which can ensure performance while rationally utilizing resources, reducing the use of precious metals per unit volume or area, and reducing the cost of use.

[0016] Furthermore, it also includes a physicochemical sludge thickening tank, and the sewage outlet of the coagulation and flotation device and the sewage outlet of the electrolytic sedimentation tank are both connected to the physicochemical sludge thickening tank.

[0017] Beneficial effects: The coagulation flotation device is mainly used to remove coarse insoluble suspended matter and oil in industrial wastewater, and the electrolytic sedimentation tank is used to separate the fine suspended matter produced by electrolysis. The chemical sludge produced in the above-mentioned device is transported to the physicochemical sludge concentration tank for subsequent recycling and treatment.

[0018] Furthermore, a submersible mixer is provided at the lower part of the hydrolysis acidification tank, and a bioelastic filler is provided at the upper part.

[0019] Beneficial effects: Setting fillers on the upper part of the hydrolysis acidification tank is beneficial to enhancing the turbulence level inside the wastewater. Through the cutting effect of the water flow, the suspended sludge and water can be mixed more evenly, thereby promoting the mass transfer of oxygen, nutrients and metabolites inside and outside the biofilm, helping to improve the kinetic conditions of the hydrolysis acidification reaction, and increasing the treatment load and stability; it can effectively decompose large molecules such as ethers into small molecules such as carboxylic acids and alcohols, thereby improving the biodegradability of the wastewater and improving the efficiency of subsequent treatment.

[0020] Furthermore, the anaerobic treatment unit includes an anaerobic fluidized bed and an anaerobic sedimentation tank which are connected in sequence, and the aerobic treatment unit includes a PACT aerobic tank, and the outlet of the PACT aerobic tank is connected to a secondary sedimentation tank.

[0021] Beneficial effects: The anaerobic treatment adopts the method of anaerobic fluidized bed + anaerobic sedimentation tank, which is beneficial to provide a good growth environment for microorganisms through fluidized carriers, strengthen the hydrolysis and fermentation process of organic matter, can effectively degrade difficult-to-degrade organic matter, and increase the organic load in sewage. The PACT aerobic tank can effectively carry out nitrification and denitrification reactions, and has a good denitrification effect on nitrogen-containing wastewater; by adopting this combined system, the present application can fully utilize the anaerobic process to achieve efficient and energy-saving organic matter decomposition and the release of some nutrients, and can use the PACT aerobic tank to ensure the deep removal of pollutants such as nitrogen and phosphorus, thereby improving the overall sewage treatment efficiency and resource recycling rate.

[0022] Furthermore, the ozone oxidation tank is arranged after the secondary sedimentation tank, an ozone diffuser is arranged in the ozone oxidation tank, and an inlet of the ozone diffuser is connected to an ozone generator.

[0023] Beneficial effects: The secondary sedimentation tank is mainly used to remove most of the suspended matter and microorganisms. The wastewater that is easy to treat can be discharged after passing through the secondary sedimentation tank; however, the wastewater treated in this application is special wastewater such as ethers. The effluent after treatment in the secondary sedimentation tank may still contain a certain amount of difficult-to-biodegrade organic matter, color, odor and some harmful trace pollutants; therefore, ozone oxidation is used after the secondary sedimentation tank, which has a strong oxidizing ability, and these residual organic matter is subjected to advanced oxidation treatment again to convert them into small molecules that are easily biodegradable or directly mineralized into harmless carbon dioxide and water; therefore, placing the ozone oxidation tank after the secondary sedimentation tank is a powerful supplement and improvement to the traditional biological treatment process, which is conducive to achieving higher effluent standards and more stringent environmental protection requirements.

[0024] Furthermore, the ozone oxidation tank is connected in sequence to the MBBR tank, the final sedimentation tank and the clear water tank.

[0025] Beneficial effects: The MBBR system has strong adaptability to water quality fluctuations. Even if the influent water quality changes greatly, it can maintain a relatively stable treatment effect. This is crucial for sewage that has been treated with ozone oxidation in the previous stage but may fluctuate due to water sources or production processes. Compared with the traditional activated sludge method, the MBBR process produces less residual sludge and lower energy consumption, which is conducive to achieving sludge reduction and reducing operating costs. Therefore, according to the ether wastewater to be treated, the configuration of an MBBR tank after the ozone oxidation tank can further enhance deep treatment, thereby ensuring that the effluent meets higher environmental standards and optimizes the overall efficiency of the entire sewage treatment plant.

[0026] Furthermore, it also includes a biochemical sludge thickening tank, and the sewage outlets of the anaerobic sedimentation tank, the secondary sedimentation tank, and the final sedimentation tank are connected to the biochemical sludge thickening tank through sewage pipes.

[0027] Furthermore, the pretreatment system also includes a Fenton reaction tank, which is arranged between the multi-dimensional electrolytic catalytic device and the electrolytic precipitation tank.

[0028] Beneficial effects: There may still be some intermediate products or complex organic matter that have not been completely oxidized in the wastewater after treatment by the electrolytic catalytic device. The chemical structure of these substances can be further transformed through the Fenton reaction, making them easier to be removed by the subsequent electrolytic sedimentation tank, reducing the viscosity of the precipitate and facilitating solid-liquid separation; and the precipitates such as metal hydroxides formed after the Fenton reaction can be used as flocculants in the electrolytic sedimentation tank, which helps the subsequent flocculation and sedimentation process and improves the sedimentation efficiency and clarity. BRIEF DESCRIPTION OF THE DRAWINGS

[0029] Figure 1 This is a schematic diagram of the connection structure of the pretreatment system of the utility model;

[0030] Figure 2 It is a schematic diagram of the connection structure of the biochemical treatment system of the utility model. DETAILED DESCRIPTION

[0031] The following is further described in detail through specific implementation methods:

[0032] The marks in the drawings of the specification include: mixed wastewater collection tank 1, vacuum kettle washing wastewater collection tank 111, monoether wastewater collection tank 112, high-salt wastewater collection tank 113, coagulation flotation device 2, multi-dimensional electrocatalytic device 3, electrolytic sedimentation tank 4, physicochemical sludge concentration tank 24, comprehensive regulating tank 5, aeration stirring device 51, hydrolysis acidification tank 6, submersible mixer 61, biological elastic filler 62, anaerobic fluidized bed 7, anaerobic sedimentation tank 71, PACT aerobic tank 8, secondary sedimentation tank 9, ozone oxidation tank 10, ozone diffuser 101, ozone generator 102, MBBR tank 11, final sedimentation tank 12, clear water tank 13, biochemical sludge concentration tank 14.

[0033] Embodiment 1

[0034] like Figure 1-2 As shown, a high-concentration ether industrial wastewater treatment system includes a mixed wastewater collection tank 1, a pretreatment system, a comprehensive regulating tank 5, a hydrolysis acidification tank 6, a biochemical treatment system and an ozone oxidation tank 10; wherein the mixed wastewater collection tank 1 is used to collect mixed wastewater containing ethylene glycol monoallyl ether, hydroxybutyl vinyl ether and cyclohexyl vinyl ether, and transport the mixed wastewater to the pretreatment system for wastewater pretreatment; specifically, the water inlet of the mixed wastewater collection tank 1 is connected to a vacuum kettle washing wastewater collection tank 111, a monoether wastewater collection tank 112, and a high-salt wastewater collection tank 113 through a pipeline, the vacuum kettle washing wastewater collection tank 111 is used to collect vinyl ether vacuum pump and kettle washing wastewater, the monoether wastewater collection tank 112 is used to collect ethylene glycol monoallyl ether production wastewater, and the high-salt wastewater collection tank 113 is used to collect ethylene glycol monoallyl ether kettle washing wastewater.

[0035] like Figure 1As shown, the pretreatment system of this embodiment includes a coagulation flotation device 2, a multi-dimensional electrocatalytic device 3 and an electrolytic precipitation tank 4 which are connected in sequence; specifically, the multi-dimensional electrocatalytic device 3 has anode plates and cathode plates arranged alternately, the anode plate is a titanium substrate, and a coating is provided on the titanium substrate. In this embodiment, the coating is a ruthenium-iridium coating with a coating thickness of 3-5um, preferably 5um; the cathode plate is a 316L stainless steel substrate, and the thickness of the anode plate and the cathode plate is 2-4mm, preferably 2mm. The coagulation and flotation device 2 is used to remove coarse insoluble suspended matter and oil in the mixed wastewater, and then the wastewater undergoes an oxidation-reduction reaction in the multidimensional electrocatalytic device 3 to break the long chains of macromolecular ethers and improve the biodegradability of the wastewater. Finally, the electrolytic sedimentation tank 4 is used to separate the fine suspended matter produced by electrolysis. The present embodiment also includes a physicochemical sludge thickening tank 24, and the sewage outlets of the coagulation and flotation device 2 and the electrolytic sedimentation tank 4 are both connected to the physicochemical sludge thickening tank 24 through sewage pipes. The chemical sludge produced by the coagulation and flotation device 2 and the electrolytic sedimentation tank 4 enters the physicochemical sludge thickening tank 24, and then is pumped into the filter press by a sludge pump for filtration. After filtration, the mud cake obtained is transported out.

[0036] like Figure 2 As shown, the pre-treated wastewater enters the comprehensive regulating tank 5, which is provided with an aeration stirring device 51. The wastewater is homogenized in the comprehensive regulating tank 5 and then enters the hydrolysis acidification tank 6. The hydrolysis acidification tank 6 is provided with a submersible mixer 61 at the bottom and a bioelastic filler 62 at the top. Specifically, in this embodiment, the bioelastic filler 62 has a height of 1m and a spacing of 200mm. The power of the submersible mixer 61 is 8W / m 3 Pool capacity configuration.

[0037] In this embodiment, the biochemical treatment system includes an anaerobic treatment unit and an aerobic treatment unit connected in sequence, and the ozone oxidation tank 10 is arranged after the aerobic treatment unit; specifically, the anaerobic treatment unit includes an anaerobic fluidized bed 7 and an anaerobic sedimentation tank 71 connected in sequence, and the aerobic treatment unit includes a PACT aerobic tank 8, and the outlet of the PACT aerobic tank 8 is connected to a secondary sedimentation tank 9; the ozone oxidation tank 10 is arranged after the secondary sedimentation tank 9, and an ozone diffuser 101 is arranged in the ozone oxidation tank 10, and the inlet of the ozone diffuser 101 is connected to an ozone generator 102; the MBBR tank 11, the final sedimentation tank 12, and the clear water tank 13 are also connected in sequence after the ozone oxidation tank 10. It also includes a biochemical sludge thickening tank 14. The sewage outlets of the anaerobic sedimentation tank 71, the secondary sedimentation tank 9, and the final sedimentation tank 12 are connected to the biochemical sludge thickening tank 14 through sewage pipes. The biochemical sludge produced by the anaerobic sedimentation tank 71, the secondary sedimentation tank 9, and the final sedimentation tank 12 enters the biochemical sludge thickening tank 14, and is then pumped into the filter press by a sludge pump for filtration. After filtration, the mud cake is transported out.

[0038] The usage of the high-concentration ether industrial wastewater treatment system is as follows:

[0039] (1) The mixed wastewater containing ethylene glycol monoallyl ether, hydroxybutyl vinyl ether and cyclohexyl vinyl ether in the mixed wastewater collection tank 1 is transported to the coagulation flotation device 2 for removing coarse insoluble suspended matter and oil in the industrial wastewater.

[0040] (2) The wastewater treated in step (1) is transported to a multidimensional electrocatalytic device 3, which uses a 15V, 800A constant current DC power supply, and anode plates and cathode plates are arranged alternately in the device; the wastewater undergoes an oxidation-reduction reaction in the multidimensional electrocatalytic device 3, breaking the long chains of macromolecular ethers and improving the biodegradability of the wastewater.

[0041] (3) The wastewater treated by the multi-dimensional electrocatalytic device 3 flows to the electrolytic sedimentation tank 4, and the fine suspended matter produced by electrolysis is separated by the electrolytic sedimentation tank 4. In the above steps, the chemical sludge produced by the coagulation and flotation device 2 and the electrolytic sedimentation tank 4 enters the physicochemical sludge concentration tank 24, and then is pumped into the filter press by the sludge pump for filtration. After filtration, the mud cake is transported out.

[0042] (4) After pretreatment, the wastewater enters the comprehensive regulating tank 5 for water quality and quantity homogenization. A stirring device is set in the comprehensive regulating tank 5 with a stirring intensity of 2m 3 / m 2 .h, after adjustment, quantitatively lifted into the hydrolysis acidification tank 6.

[0043] (5) Hydrolysis and acidification tank 6 is used to decompose large molecules such as ethers into small molecules such as carboxylic acids and alcohols to improve the biodegradability of wastewater. The designed COD volume removal load is 0.22 kgCOD / m 3 .d. The bioelastic filler 62 arranged at the top is 1m high and 200mm apart. The submersible mixer 61 at the bottom has a power of 8W / m 3 Pool capacity configuration.

[0044] (6) The effluent from the hydrolysis acidification tank 6 enters the anaerobic fluidized bed 7. The designed COD volume removal load of the anaerobic fluidized bed 7 is 1.17 kgCOD / m 3 .d. The fluidized bed uses suspended filler with a density of 0.96g / m 3 , dosing rate 15%; in addition, the hydrolysis acidification tank 6 controls the pH at 6.5-7.5 by adding liquid alkali.

[0045] (7) The effluent from the anaerobic fluidized bed 7 is connected to the anaerobic sedimentation tank 71 through a pipeline. The surface load of the anaerobic sedimentation tank 71 is 0.5m 3 / m 2 .h.

[0046] (8) The outlet of the anaerobic fluidized bed 7 is connected to the biological selection zone, which provides a high-load zone with sufficient oxygen source and food, allowing the floc bacteria to first seize the organic matter without giving the filamentous bacteria the opportunity to over-reproduce. The residence time in the biological selection zone is 15 hours.

[0047] (9) The effluent from the biological selection area is connected to the PACT aerobic pool 8. An oxygenating device is installed at the bottom of the PACT aerobic pool 8 to decompose organic pollutants using the life activities of microorganisms; COD removal load 0.22 kgCOD / m 3 .d, sludge concentration 4000mg / L, powdered activated carbon was added to PACT aerobic tank 8, with a dosage of 50g / m 3 .

[0048] (10) The effluent from the PACT aerobic tank 8 enters the secondary sedimentation tank 9 to precipitate and separate the activated sludge, which is then returned to the PACT aerobic tank 8 via a sludge return pump; the effluent from the secondary sedimentation tank 9 enters the ozone oxidation tank 10 via an overflow weir.

[0049] (11) The ozone oxidation tank 10 is equipped with a titanium alloy aerator, and ozone is added through an air source ozone generator 102. The ozone dosage is 100 mg / L and the contact time is 8 hours. The organic matter that is not completely degraded by biochemical treatment and the biological metabolites and derivatives of certain organic matter are completely oxidized after ozone catalytic oxidation, and the other part is oxidized into simple organic matter such as alcohols and short-chain alkanes, and then enters the MBBR tank 11 with the wastewater.

[0050] (12) MBBR belongs to the biofilm method. The food chain formed on the biofilm is longer than that of the activated sludge method. The sludge age is long, the biological food chain is long, the biological phase is rich, and the dominant bacteria are obvious. Organic matter is completely removed here to ensure that the sewage treatment system can operate stably and meet the standards for a long time.

[0051] (13) The effluent from the MBBR tank 11 enters the final sedimentation tank 12, where it settles and separates the aged biofilm fragments, and then enters the clear water tank 13. The effluent meets the discharge standards.

[0052] Among them, for step (2), the present application experimentally verified the multi-dimensional electrocatalytic reaction of a certain ether substance in the pretreatment stage, and conducted experiments at the Chongqing Chemical Wastewater Treatment and Pollution Control Engineering Technology Research Center. The experiment used industrial wastewater from the Chongqing Chemical Research Institute. By setting a DC power supply constant current of 20A, a voltage of 30.6V, and using an 8L / min magnetic pump for cyclic electrolysis, after electrolysis, the wastewater emulsified oily state disappeared, and the light transmittance of the water improved. The experimental results are shown in Table 1 below.

[0053] Table 1: Experimental results of electrolysis of ethylene glycol monoallyl ether

[0054] Process section COD(mg / L) BOD(mg / L) B / C Before electrolysis Water Intake 45560 11200 0.25 After electrolysis Water Intake 26463 10850 0.41

[0055] According to the experimental results, we can know that:

[0056] Multidimensional electrocatalysis can remove a certain amount of COD from ether wastewater. Through electrolytic pretreatment, the B / C of wastewater can be improved, and the biodegradability of wastewater can be improved, laying the foundation for subsequent biochemical treatment. The advantage of using this method to pretreat ether wastewater is that it is a technology that does not require the addition of treatment agents. It can pretreat ether wastewater at the lowest cost, that is, no more than 8-12 kWh*hour / cubic meter, and improve its biodegradability.

[0057] The applicant took continuous samples at the sewage outlet for each treatment stage and tested the most important indicators. It was found that the use of this system to treat ether wastewater can ensure that the effluent meets the discharge standards stably. Specifically, the treatment effects of each treatment stage are shown in Table 2 below:

[0058] Table 2: Test data of each stage of wastewater treatment

[0059]

[0060] In summary, compared with the traditional incineration method for treating high-concentration ether wastewater, the present application has the advantages of low construction cost, low equipment operation cost, simple operation and management, not prone to equipment failure, and small secondary pollution; and after the wastewater is treated, it can meet the third level standard of the "Comprehensive Pollutant Emission Standard" (GB8978-1996), the water quality of the effluent from the drain is stable, and the wastewater treatment efficiency is high, which provides a new and effective wastewater treatment method for ether wastewater treatment.

[0061] Embodiment 2

[0062] The difference between this embodiment and the first embodiment is that the pretreatment system further includes a Fenton reaction pool, and the Fenton reaction pool is arranged between the multi-dimensional electrolytic catalytic device 3 and the electrolytic precipitation pool 4 (not shown in the figure).

[0063] In view of the technical solution provided in this embodiment, the applicant conducted a two-stage test of multidimensional electrolysis + UV-Fenton (photo-Fenton reaction) on monoether wastewater. The experimental process was as follows: take the water sample (COD = 36628 mg / L) after multidimensional electrolysis treatment, continue to perform photo-Fenton oxidation, the H2O2 dosage is 10 mL / L, the reaction time is 2 h, and after the pH is adjusted to neutral, take the supernatant for testing.

[0064] The experimental results are as follows:

[0065] (1) The treated wastewater is clear and has a reduced irritating odor, indicating that the metal hydroxide and other precipitates formed after the Fenton reaction can be used as flocculants in the electrolytic sedimentation tank, which helps the subsequent flocculation and sedimentation process and improves the sedimentation efficiency and clarity.

[0066] (2) The supernatant after the reaction was taken and measured to have COD: 35982 mg / L, BOD5: 10980 mg / L, and the COD removal rate (multi-dimensional electrolysis + photo-Fenton two-stage) was about 20.0%, B / C = 0.305. This shows that the photo-Fenton method has a certain removal effect on monoether wastewater, but it requires the addition of a very large amount of oxidant. When the amount of oxidant is small, the COD removal effect is not obvious.

[0067] The above is only an embodiment of the utility model. The utility model is not limited to the field involved in this implementation case. The common knowledge such as the known specific structure and characteristics in the scheme is not described in detail here. It should be pointed out that for those skilled in the art, several deformations and improvements can be made without departing from the structure of the utility model, which should also be regarded as the protection scope of the utility model, and these will not affect the effect of the implementation of the utility model and the practicality of the patent. The scope of protection required by this application shall be based on the content of its claims, and the specific implementation methods and other records in the specification can be used to interpret the content of the claims.

Claims

1. High concentration ether industrial wastewater treatment system, characterized in that: It includes a mixed wastewater collection tank, a pretreatment system, a comprehensive regulating tank, a hydrolysis acidification tank, a biochemical treatment system and an ozone oxidation tank. The pretreatment system includes a coagulation flotation device, a multi-dimensional electrocatalytic device and an electrolytic sedimentation tank connected in sequence. The biochemical treatment system includes an anaerobic treatment unit and an aerobic treatment unit connected in sequence. The ozone oxidation tank is arranged after the aerobic treatment unit.

2. The high-concentration ether industrial wastewater treatment system according to claim 1, characterized in that: The multi-dimensional electrocatalytic device has anode plates and cathode plates arranged alternately therein. The anode plates are titanium substrates with a coating thereon, and the cathode plates are stainless steel substrates. The thickness of the anode plates and cathode plates is 2-4 mm.

3. The high-concentration ether industrial wastewater treatment system according to claim 2 is characterized in that: The coating is a ruthenium-iridium coating with a coating thickness of 3-5 um.

4. The high-concentration ether industrial wastewater treatment system according to any one of claims 1 to 3, characterized in that: It also includes a physicochemical sludge thickening tank, and the sewage outlet of the coagulation and flotation device and the sewage outlet of the electrolytic sedimentation tank are both connected to the physicochemical sludge thickening tank.

5. The high-concentration ether industrial wastewater treatment system according to claim 4 is characterized in that: A submersible mixer is arranged at the lower part of the hydrolysis acidification tank, and a biological elastic filler is arranged at the upper part.

6. The high-concentration ether industrial wastewater treatment system according to claim 5, characterized in that: The anaerobic treatment unit comprises an anaerobic fluidized bed and an anaerobic sedimentation tank which are connected in sequence, and the aerobic treatment unit comprises a PACT aerobic tank, wherein the water outlet of the PACT aerobic tank is connected to a secondary sedimentation tank.

7. The high-concentration ether industrial wastewater treatment system according to claim 6, characterized in that: The ozone oxidation tank is arranged after the secondary sedimentation tank. An ozone diffuser is arranged in the ozone oxidation tank. The inlet of the ozone diffuser is connected to an ozone generator.

8. The high-concentration ether industrial wastewater treatment system according to claim 7, characterized in that: The ozone oxidation tank is also connected in sequence to an MBBR tank, a final sedimentation tank, and a clear water tank.

9. The high-concentration ether industrial wastewater treatment system according to claim 8, characterized in that: It also includes a biochemical sludge concentration tank, and the sewage outlets of the anaerobic sedimentation tank, the secondary sedimentation tank, and the final sedimentation tank are connected with the biochemical sludge concentration tank through sewage pipes.

10. The high-concentration ether industrial wastewater treatment system according to claim 1, characterized in that: The pretreatment system also includes a Fenton reaction tank, which is arranged between the multi-dimensional electrolytic catalytic device and the electrolytic precipitation tank.

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