Bioelectrochemical device for treating slicing wastewater

Abstract

The utility model discloses a bioelectrochemical device for treating slicing wastewater, which comprises a bioelectrochemical reaction component, an aerobic bio-membrane reactor, a Fenton reaction tank, a coagulation reaction tank and a sludge settling pond, and the bioelectrochemical reaction component is respectively communicated with the aerobic bio-membrane reactor and the Fenton reaction tank; a sludge backflow discharge pipe of the aerobic bio-membrane reactor is communicated with the bioelectrochemical reaction component; the aerobic bio-membrane reactor is communicated with the Fenton reaction tank, the Fenton reaction tank, the coagulation reaction tank and the sludge sedimentation tank are sequentially communicated, and a sludge discharge pipeline of the sludge sedimentation tank is communicated with the bioelectrochemical reaction assembly. According to the device, the Fenton reaction agent can be generated from the Fenton sludge, and meanwhile, the treatment efficiency of the slicing wastewater is improved.

Description

Technical Field

[0001] The utility model belongs to the technical field of advanced oxidation water treatment, in particular to a bioelectrochemical device for treating organic wastewater from slices. Background Art

[0002] Fenton oxidation technology is an advanced oxidation method that can effectively degrade organic matter. 2+ A chain reaction occurs between the acid and H2O2 to generate hydroxyl radicals (·OH) with strong oxidizing properties. ·OH can interact with organic compounds to achieve the purpose of removing organic matter. However, this method still has bottlenecks that are difficult to solve in practical applications, mainly in three aspects: (1) The reaction must be carried out under acidic conditions in a very narrow pH range (2-3.5). Therefore, in actual wastewater treatment, a large amount of acid must be consumed, and the treated water needs to be adjusted to neutral before discharge, which greatly increases the difficulty of water treatment and operating costs. These shortcomings hinder the widespread application of this method, especially due to restrictive legislation on sludge disposal and economic evaluation of wastewater treatment processes. The Fenton sludge yield depends largely on the proportion and volume of the reagents. In addition, the sludge generated by the Fenton process for treating difficult-to-treat wastewater is usually regarded as hazardous solid waste due to excessive residual pollutants, which increases the cost of sludge treatment and the risk of secondary pollutants.

[0003] Fenton sludge is a mixture of Fe(OH)3, organic matter, heavy metals, microorganisms, sediment impurities and water. It is a complex heterogeneous sludge. The performance of Fenton sludge depends largely on the source of its wastewater and the volume and proportion of the added reagents. Fenton sludge has recycling value due to its metallic properties, but the commonly used iron ion reduction recovery method requires a large amount of reducing agent to be added, and the Fe 2+ There are many organic substances in the product, which increases the cost of Fenton treatment and makes it difficult to apply in engineering. Photovoltaic silicon wafer slicing wastewater contains a high concentration of cutting fluid and a high organic concentration COD, which is a difficult-to-degrade organic wastewater. Traditional Fenton treatment can effectively improve biodegradability and ensure a certain amount of COD removal, but it will produce a large amount of Fenton sludge, increasing the disposal cost. Therefore, in response to the above problems, a bioelectrochemical device for treating slicing wastewater is proposed. Utility Model Content

[0004] Purpose of the utility model: In view of the secondary pollution and sludge disposal cost caused by the large amount of sludge generated in the Fenton treatment of chip wastewater, the utility model proposes a bioelectrochemical device for treating chip wastewater, which can degrade organic matter and produce hydrogen peroxide. At the same time, Fenton sludge can generate Fe 2+ Reagents can greatly reduce the use of external reagents and reduce operating costs.

[0005] Technical solution: To achieve the above purpose, the technical solution adopted by the utility model is:

[0006] A bioelectrochemical device for treating slicing wastewater, comprising a bioelectrochemical reaction component, an aerobic biofilm reactor, a Fenton reaction tank, a coagulation reaction tank, and a sludge sedimentation tank, wherein:

[0007] The bio-electrochemical reaction assembly is connected to the aerobic biofilm reactor and the Fenton reaction tank respectively, and the sludge reflux discharge pipe of the aerobic biofilm reactor is connected to the bio-electrochemical reaction assembly. The aerobic biofilm reactor is connected to the Fenton reaction tank, and the Fenton reaction tank, the coagulation reaction tank, and the sludge sedimentation tank are connected in sequence, and the sludge discharge pipe of the sludge sedimentation tank is connected to the bio-electrochemical reaction assembly.

[0008] Preferably: the bioelectrochemical reaction components include a bioanode cell, a Fe 2+ Reduction biological cathode pool and hydrogen peroxide cathode pool, the biological anode pool, Fe 2+ The reduction biological cathode pool is separated by a cation exchange membrane, and the biological anode pool and the hydrogen peroxide cathode pool are separated by a one-way air filter membrane. 2+ The reduction biocathode pool is provided with a biocathode and a biofiller placement cavity. The bioanode pool is provided with a bioanode and a biofiller placement cavity, the hydrogen peroxide cathode pool is provided with a hydrogen peroxide cathode, the bioanode and the biocathode are connected via a resistor, and the bioanode and the hydrogen peroxide cathode are connected via a resistor.

[0009] Preferred: The Fe 2+ Reduction of the biological cathode pool through Fe 2+ The transfer tank is connected to the Fenton reaction tank. The drain pipe of the biological anode pool is connected to the water inlet pipe of the aerobic biofilm reactor through the aerobic biofilm water inlet pipeline. The drain pipe of the hydrogen peroxide cathode pool is connected to the hydrogen peroxide water inlet pipe of the Fenton reaction tank through the hydrogen peroxide transfer tank. The drain pipe of the aerobic biofilm reactor is connected to the water inlet pipe of the Fenton reaction tank through the Fenton water inlet pipeline. The sludge return discharge pipe of the aerobic biofilm reactor is connected to the return pipe at the bottom of the biological anode pool.

[0010] Preferably: the drainage pipe of the Fenton reaction tank is connected to the water inlet pipe of the coagulation reaction tank. The muddy water drainage pipe of the coagulation reaction tank is connected to the muddy water inlet pipe of the sludge sedimentation tank. The mud discharge pipe of the sludge sedimentation tank is connected to the Fe 2+ The mud inlet pipeline of the reduction biological cathode tank is connected.

[0011] Preferably: an air pump is provided in the hydrogen peroxide cathode cell.

[0012] Preferably: the Fenton reaction tank is connected to an acid storage tank.

[0013] Preferably, the coagulation reaction tank is connected with a PAM storage tank, a PAC storage tank and an alkali storage tank.

[0014] Preferably, the Fenton reaction tank is provided with a Fenton pH meter, a Fenton COD meter and a stirrer.

[0015] Preferably: the coagulation reaction tank is provided with a coagulation pH meter and a coagulation COD meter.

[0016] Preferably: a mud level meter is provided on the sludge sedimentation tank.

[0017] Compared with the prior art, the utility model has the following beneficial effects:

[0018] The wastewater of the utility model enters the Fenton reaction tank for Fenton reaction after being treated by the bioelectrochemical reaction component and the aerobic biofilm reactor, which can effectively improve the degradation efficiency of difficult-to-degrade pollutants and the biodegradability of the slicing wastewater, and at the same time enable the device to treat wastewater with higher organic matter concentration. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 Schematic diagram of a bioelectrochemical device for treating slice wastewater according to an embodiment.

[0020] Among them, 1 is a bioelectrochemical reaction component, 2 is an aerobic biofilm reactor, 3 is a Fenton reaction tank, 4 is a coagulation reaction tank, 5 is a sludge sedimentation tank, 6 is a Fenton water inlet pipeline, 7 is a sedimentation sludge pump, 8 is a resistor, 9 is a biological filler placement chamber, 10 is a biological cathode, 11 is a cation exchange membrane, 12 is a Fe2+ transfer tank, 13 is a biological anode, 14 is a one-way air filter membrane, 15 is a hydrogen peroxide cathode, 16 is a water outlet pipeline, 17 is an air Air pump, 18, aerobic biofilm water inlet pipeline, 19 is hydrogen peroxide transfer tank, 20 is aerobic biofilm, 21 is aerator, 22 is acid storage tank, 23 is Fenton pH meter, 24 is Fenton COD meter, 25 is agitator, 26 is PAM storage tank, 27 is PAC storage tank, 28 is alkali storage tank, 29 is coagulation pH meter, 30 is coagulation COD meter, 31 is emptying pump, 32 is mud level meter, 33 is biological cathode pH meter, 34 is sampling valve. DETAILED DESCRIPTION

[0021] The present invention is further explained below in conjunction with the accompanying drawings and specific embodiments. It should be understood that these examples are only used to illustrate the present invention and are not used to limit the scope of the present invention. After reading the present invention, various equivalent forms of modifications to the present invention by those skilled in the art all fall within the scope defined by the claims attached to this application.

[0022] This embodiment discloses a bioelectrochemical device for treating slicing wastewater, such as Figure 1As shown, it includes a bio-electrochemical reaction component 1, an aerobic biofilm reactor 2, a Fenton reaction tank 3, a coagulation reaction tank 4, and a sludge sedimentation tank 5, wherein:

[0023] The bioelectrochemical reaction assembly 1 is respectively connected to the aerobic biofilm reactor 2 and the Fenton reaction tank 3, and the sludge return discharge pipe of the aerobic biofilm reactor 2 is connected to the bioelectrochemical reaction assembly 1. The aerobic biofilm reactor 2 is connected to the Fenton reaction tank 3, and the Fenton reaction tank 3, the coagulation reaction tank 4, and the sludge sedimentation tank 5 are connected in sequence, and the sludge discharge pipe of the sludge sedimentation tank 5 is connected to the bioelectrochemical reaction assembly 1. The bioelectrochemical reaction assembly, the aerobic biofilm reactor, the Fenton reaction tank, the coagulation reaction tank, and the sludge sedimentation tank are connected through pipelines.

[0024] The bioelectrochemical reaction component 1 includes a bioanode cell, a Fe 2+ Reduction biological cathode pool and hydrogen peroxide cathode pool, the biological anode pool, Fe 2+ The reduction biological cathode pool is separated by a cation exchange membrane 11, and the biological anode pool and the hydrogen peroxide cathode pool are separated by a one-way air filter membrane 14. 2+ Reduction of the biological cathode pool through Fe 2+ The transfer tank 12 is communicated with the Fenton reaction tank 3 .

[0025] The bioelectrochemical reaction component includes a cathode pool and a bioanode pool. The cathode pool is divided into Fe 2+ Reduction biological cathode pool and hydrogen peroxide cathode pool, the Fe 2+ The reduction biocathode pool includes a biocathode, iron-reducing bacteria and biological fillers. 2+ The transfer tank then discharges into the Fenton reaction tank; the hydrogen peroxide cathode pool includes a hydrogen peroxide cathode and an air pump, and its bottom is connected to the hydrogen peroxide transfer tank and then discharges into the Fenton reaction tank. The biological anode pool includes a biological anode, activated sludge and biological filler. 2+ The reduction biocathode pool and the bioanode pool are separated by a cation exchange membrane. + The bioanode tank and the hydrogen peroxide cathode tank are separated by a one-way air filter. The wastewater enters the bioanode tank of the bioelectrochemical reaction component. The bottom of the bioanode tank is connected to the aerobic biofilm water inlet pipeline, and the wastewater is pumped into the aerobic biofilm reactor through a pump pipe.

[0026] The Fe 2+ The reduction biocathode pool is provided with a biocathode 10, iron-reducing bacteria and a biofiller placement chamber 9. 2+Iron-reducing bacteria and an appropriate amount of citric acid were added to the reduction biological cathode pool to promote the iron ion reduction reaction. The working electrode was a carbon fiber wire (100*4mm) washed with acetone, fixed on a titanium wire with a diameter of 0.5mm, and the bottom was connected to a drainage pipe. 2+ Transfer tank 12 will generate Fe 2+ Transfer to Fenton reaction tank 3. The bioanode pool is provided with a bioanode 13 and a biofiller placement chamber 9. The anode electrode in the bioanode pool is made of carbon fiber. The bottom of the bioelectrochemical reaction component is connected to a drainage pipe, and the treated water enters the aerobic biofilm reactor 2. A resistor 8 is connected between the biocathode and the bioanode, and the cation exchange membrane 11 converts Fe 2+ The reduction biocathode pool and the bioanode pool are separated, and the H produced by the anode is + The one-way air filter 14 separates the biological anode pool and the hydrogen peroxide cathode pool. At the same time, after the organic wastewater enters the biological anode pool for reaction, some organic pollutants in the wastewater can be degraded and the biodegradability of the organic wastewater can be improved.

[0027] The hydrogen peroxide cathode pool is provided with a hydrogen peroxide cathode 15, which is a cathode for preparing H2O2 after wrapping pyrrole with a polyacrylonitrile-based carbon fiber brush by a chronoamperometry method. The hydrogen peroxide cathode pool generates H2O2 as a reagent for the Fenton reaction through an air pump and the hydrogen peroxide cathode. The device can increase the production of hydrogen peroxide and reduce the reagent cost. The bioanode 13 is connected to the biocathode 10 through a resistor 8, and the bioanode 13 is connected to the hydrogen peroxide cathode 15 through a resistor 8.

[0028] The hydrogen peroxide cathode 15 uses a polyacrylonitrile-based carbon fiber brush to wrap pyrrole to prepare the cathode of H2O2 by the timed current method, which can improve the efficiency of H2O2 production. The organic matter in the wastewater is oxidized by the microorganisms growing on the anode, and electrons and protons are generated at the same time. The protons and electrons enter the cathode pool through the membrane and the external circuit, and react with O2 in the cathode pool to generate H2O2, and generate electricity at the same time. The bottom of the hydrogen peroxide cathode pool is connected to a drainage pipe, and the drainage pipe is connected to a hydrogen peroxide transfer tank 19 to pump hydrogen peroxide into the Fenton reaction tank 3.

[0029] The drain pipe of the bioanode pool is connected to the water inlet pipe of the aerobic biofilm reactor 2 through the aerobic biofilm water inlet pipeline 18. The drain pipe of the hydrogen peroxide cathode pool is connected to the hydrogen peroxide water inlet pipe of the Fenton reaction tank 3 through the hydrogen peroxide transfer tank 19. The drain pipe of the aerobic biofilm reactor 2 is connected to the water inlet pipe of the Fenton reaction tank 3 through the Fenton water inlet pipeline 6. The sludge return discharge pipe of the aerobic biofilm reactor 2 is connected to the return pipe at the bottom of the bioanode pool. The aerobic biofilm reactor includes an aerobic biofilm and an aerator, and the upper part of the aerobic biofilm reactor is connected to an outlet pipe, which is connected to the Fenton water inlet pipeline and enters the Fenton reaction component.

[0030] The top of the aerobic biofilm reactor 2 is connected to the aerobic biofilm water inlet pipeline 18, and the slice wastewater treated by the aerobic biofilm reactor is discharged into the Fenton reaction tank 3 through a drainage pump. As a pre-treatment device of the Fenton reaction device, the aerobic biofilm reactor can effectively remove pollutants in the wastewater. At the same time, the aerobic biofilm reactor coupled with the Fenton reaction can treat wastewater with a higher organic matter concentration.

[0031] An air pump 17 is provided in the hydrogen peroxide cathode pool. The Fenton reaction tank 3 is connected to an acid storage tank 22, and a Fenton pH meter 23, a Fenton COD meter 24 and a stirrer 25 are provided on the Fenton reaction tank 3. The Fenton pH meter 23 reads the pH value of the wastewater in real time, and the Fenton COD meter 24 reads the COD value of the wastewater in real time; the rapid test paper method detects Fe 2+ Concentration and hydrogen peroxide concentration were monitored at a frequency of 1 time / 2 min during the Fenton reaction.

[0032] The drainage pipe of the Fenton reaction tank 3 is connected to the water inlet pipe of the coagulation reaction tank 4. The Fenton reaction tank is connected to the coagulation reaction tank through a pipeline, and the effluent of the Fenton reaction assembly is transported to the coagulation reaction tank. The Fenton drainage pipe after the reaction is connected to the coagulation reaction tank through a Fenton drainage pump, and the mud-water mixture after coagulation is discharged into the sludge sedimentation tank 5 through a pipeline. The bottom of the sludge sedimentation tank is connected to a sludge discharge pipe, and the sludge at the bottom is pumped into the Fe sedimentation pump 7. 2+ Reduction biological cathode pool, after reduction, Fe 2+ Transfer tank 12 connected to the pump tube to transfer Fe 2+ Put it into Fenton reactor for 3 times.

[0033] The coagulation reaction tank 4 is connected to a PAM storage tank 26 , a PAC storage tank 27 and an alkali storage tank 28 , and a coagulation pH meter 29 and a coagulation COD meter 30 are provided on the coagulation reaction tank 4 .

[0034] The coagulation reaction tank is connected to the effluent of the Fenton reaction tank 3 , and is connected to the PAM storage tank 26 , the PAC storage tank 27 and the alkali storage tank 28 through a pump pipe, and the reaction forms larger flocculent sludge which is discharged into the sludge sedimentation tank 5 .

[0035] The muddy water discharge pipe of the coagulation reaction tank 4 is connected to the muddy water inlet pipe of the sludge sedimentation tank 5. The mud discharge pipe of the sludge sedimentation tank 5 is connected to the Fe 2+ The mud inlet pipe of the reduction biological cathode tank is connected.

[0036] The bottom of the sludge sedimentation tank 5 is connected to a sludge discharge pipe to discharge the Fenton sludge, which is then discharged into the FeO2 of the bioelectrochemical reaction component 1 through a sedimentation sludge discharge pump 7. 2+ The biological cathode tank is reduced, and the remaining sludge after the reaction is discharged from the reaction tank through the emptying pump 31.

[0037] The sludge sedimentation tank 5 is provided with a mud level meter 32 .

[0038] By designing a device that couples aerobic biofilm reactor with bioelectrochemical cell, the intelligent operation of each component is controlled, and the COD, hydrogen peroxide and Fe content of Fenton reactor are controlled. 2+ The ratio of Fe 2+ Reduction technology promotes the recycling of Fenton sludge, reduces the addition of chemicals, and reduces sludge treatment costs.

[0039] The organic matter in the wastewater in the biological anode pool is oxidized by the microorganisms growing on the anode, and electrons and protons are generated at the same time. The protons and electrons enter the cathode pool through the membrane and the external circuit, and react with O2 in the hydrogen peroxide cathode pool to generate H2O2, while generating electrical energy, thereby reducing the reagent cost and labor cost of the entire reuse device, achieving the purpose of Fenton sludge participating in the reaction as a Fenton catalyst substrate, and improving the stability of the system.

[0040] The whole device consists of a bioelectrochemical reaction component, an aerobic biofilm reactor, a Fenton reaction tank, a coagulation reaction tank, and a sludge sedimentation tank. 2+ Reduction of Fe produced in the biological cathode pool 22+ It is returned to the Fenton reaction tank to achieve the recycling of Fenton sludge.

[0041] The wastewater treatment route of this device is: inlet water → bioelectrochemical reaction component → aerobic biofilm reactor → Fenton reaction tank → coagulation reaction tank → sludge sedimentation tank → effluent.

[0042] The sludge circulation route of this device is: coagulation reaction tank → sludge sedimentation tank → bioelectrochemical reaction component → Fenton reaction tank → coagulation reaction tank.

[0043] The slicing wastewater is used as the anode liquid and sent to the biological anode tank. A mixture of activated sludge and anaerobic sludge is inoculated in the biological anode tank, and an appropriate amount of electroactive bacteria is inoculated at the same time. 2+ The reduction biological cathode pool is equipped with biological fillers to enable microorganisms to attach to the fillers, thereby increasing the contact area between microorganisms and organic wastewater. 2mM bromoethane sulfonate is added to the biological anode pool to inhibit the growth of methanogenic bacteria. The pH value of the sliced ​​wastewater (anode liquid) is 5-6, and the anode pool is closed and no air enters. The membrane forms a bridge between the cathode pool and the anode pool to transport protons produced during microbial metabolism. At the same time, an air pump is installed in the hydrogen peroxide cathode pool on the other side, and an appropriate amount of air is introduced through the air pump to produce H2O2. The hydrogen peroxide cathode pool uses a polyacrylonitrile-based carbon fiber brush to wrap pyrrole to prepare the cathode by the chronoamperometry, which can improve the selectivity of the 2e-1 oxygen reduction reaction and increase the yield of H2O2.

[0044] Fe 2+ The cathode solution in the reduction biological cathode pool uses a ferric chloride solution containing a phosphate buffer. After 4 weeks of operation, the microorganisms are enriched and the cathode is inoculated with mixed cultured bacteria and iron-reducing bacteria. At the same time, the external resistance is changed from 1000Ω to 100Ω. The Fenton sludge is automatically interlocked with the mud level meter and the sedimentation sludge pump to regularly transport the Fenton sludge into the biological Fe 2+ The cathode pool was reduced and iron-reducing bacteria were mixed and inoculated to control the pH of the biocathode at 6.0. + Can enter Fe through cation exchange membrane 2+ Reduce the biological cathode pool, add an appropriate amount of citric acid, keep it under acidic conditions, increase the solubility of trivalent iron, and increase Fe 2+ conversion rate.

[0045] Adding an appropriate amount of citric acid to the bioelectrochemical reaction component can promote the dissolution of iron ions in Fenton sludge, enhance the iron-reducing bacteria to reduce trivalent iron ions to divalent iron ions, make the iron ion valence state conversion faster, and promote the Fenton reaction effect.

[0046] The hydrogen peroxide cathode pool reacts to generate H2O2 which is stored in the hydrogen peroxide transfer tank 19. The hydrogen peroxide concentration in the tank is detected by the rapid test paper method and reaches 20%-25% before being pumped into the Fenton reaction tank. 2+ Fe reduction in the biological cathode pool 2+ Also in Fe 2+ Transfer tank 12, rapid test paper method for Fe 2+ Fe in transfer tank 2+ Concentration, after reaching a stable concentration of 10-15%, it is pumped into the Fenton reaction tank.

[0047] The effluent from the bioelectrochemical reaction component enters the aerobic biofilm reactor, where organic pollutants can be effectively degraded, which can reduce the organic load of the Fenton reactor inlet and improve the organic matter removal rate of the Fenton reaction. At the same time, the sludge concentration of the effluent from the bioelectrochemical reaction component is monitored through the sampling valve, and the sludge of the aerobic biofilm reactor is set to flow back to the bioelectrochemical reaction component to control the sludge concentration of the biological anode tank; the COD value is regularly monitored through the effluent sampling valve of the aerobic biofilm reactor, and the required Fe is calculated based on the COD value. 2+ amount and hydrogen peroxide, according to COD:Fe 2+ :H2O2=1:1:2 mass ratio, extract Fe 2+ Quantitative Fe of transfer tank 2+ The quantitative H2O2 in the hydrogen peroxide transfer tank and the effluent from the aerobic biofilm reactor enter the Fenton reaction tank. The Fenton reaction tank is equipped with a Fenton pH meter and a Fenton COD meter. The Fenton pH meter is linked with the acid storage tank to automatically add acid to control the pH value of the slice wastewater in the tank to 3.5.

[0048] After the effluent from the Fenton reactor enters the coagulation reactor, the alkali storage tank 28 supplies alkali to the coagulation reactor, and the pH is adjusted to 9-10. At the same time, PAC and PAM are quantitatively added. The effluent mixture enters the sludge sedimentation tank 5 to separate the sludge and water. The supernatant is discharged through the effluent pipe 16, and the sludge is collected by the bottom sludge collecting device and discharged into the bio-electrochemical reaction component 1 through the sedimentation sludge pump 7. 2+ Citric acid was added to the reduction biocathode pool, and the pH was controlled at 6 by the biocathode pH meter. Iron-reducing bacteria generated divalent iron from the iron-containing sludge. The concentration of added citric acid was about 70-80 mg / L, and the Fe produced was 2+ Solution discharged into Fe 2+ The transfer tank is also tested for Fe 2+ When the concentration is above 10%, it is discharged into the Fenton reaction tank.

[0049] Wastewater enters the bioelectrochemical reaction component and is discharged into the aerobic biofilm reactor after the reaction. The effluent from the aerobic biofilm reactor is then discharged into the Fenton reaction tank. After the Fenton reaction, it is discharged into the coagulation reaction tank. The mud-water mixture in the coagulation reaction tank is discharged into the sludge sedimentation tank. The clear water from the upper part of the sedimentation tank is discharged, and the sludge from the lower part is pumped into the Fe 2+ Reduction biological cathode tank, after Fenton sludge is biologically reduced, the Fe 2+ The sludge is then recycled back to the Fenton reaction tank, and the hydrogen peroxide generated in the hydrogen peroxide cathode tank is transferred to the Fenton reaction tank. The entire device can realize automatic control of Fenton sludge recycling. The utility model can generate Fenton reaction reagent from Fenton sludge and improve the treatment efficiency of slice wastewater.

[0050] 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 protection scope of the present invention.

Claims

1. A bioelectrochemical device for treating slicing wastewater, characterized in that: It comprises a bio-electrochemical reaction component (1), an aerobic biofilm reactor (2), a Fenton reaction tank (3), a coagulation reaction tank (4), and a sludge sedimentation tank (5), wherein: The bioelectrochemical reaction component (1) is respectively connected to the aerobic biofilm reactor (2) and the Fenton reaction tank (3), and the sludge return discharge pipe of the aerobic biofilm reactor (2) is connected to the bioelectrochemical reaction component (1); the aerobic biofilm reactor (2) is connected to the Fenton reaction tank (3), and the Fenton reaction tank (3), the coagulation reaction tank (4), and the sludge sedimentation tank (5) are connected in sequence, and the sludge discharge pipe of the sludge sedimentation tank (5) is connected to the bioelectrochemical reaction component (1).

2. The bioelectrochemical device for treating slicing wastewater according to claim 1, characterized in that: The bioelectrochemical reaction component (1) comprises a bioanode cell, a Fe 2+ Reduction biological cathode pool and hydrogen peroxide cathode pool, the biological anode pool, Fe 2+ The reduction biological cathode pool is separated by a cation exchange membrane (11), and the biological anode pool and the hydrogen peroxide cathode pool are separated by a one-way air filter membrane (14); the Fe 2+ A biological cathode (10) and a biological filler placement cavity (9) are arranged in the reduction biological cathode pool; a biological anode (13) and a biological filler placement cavity (9) are arranged in the biological anode pool; a hydrogen peroxide cathode (15) is arranged in the hydrogen peroxide cathode pool; the biological anode (13) and the biological cathode (10) are connected via a resistor (8); and the biological anode (13) and the hydrogen peroxide cathode (15) are connected via a resistor (8).

3. The bioelectrochemical device for treating slicing wastewater according to claim 2, characterized in that: The Fe 2+ Reduction of the biological cathode pool through Fe 2+ The transfer tank (12) is connected to the Fenton reaction tank (3); the drainage pipe of the biological anode pool is connected to the water inlet pipe of the aerobic biofilm reactor (2) via the aerobic biofilm water inlet pipeline (18); the drainage pipe of the hydrogen peroxide cathode pool is connected to the hydrogen peroxide water inlet pipe of the Fenton reaction tank (3) via the hydrogen peroxide transfer tank (19); the drainage pipe of the aerobic biofilm reactor (2) is connected to the water inlet pipe of the Fenton reaction tank (3) via the Fenton water inlet pipeline (6); and the sludge return discharge pipe of the aerobic biofilm reactor (2) is connected to the bottom return pipe of the biological anode pool.

4. The bioelectrochemical device for treating slicing wastewater according to claim 3, characterized in that: The drainage pipe of the Fenton reaction tank (3) is connected to the water inlet pipe of the coagulation reaction tank (4); the muddy water drainage pipe of the coagulation reaction tank (4) is connected to the muddy water inlet pipe of the sludge sedimentation tank (5); the mud discharge pipe of the sludge sedimentation tank (5) is connected to the Fenton reaction tank (3) through the sedimentation mud discharge pump (7). 2+ The mud inlet pipeline of the reduction biological cathode tank is connected.

5. The bioelectrochemical device for treating slicing wastewater according to claim 4, characterized in that: An air pump (17) is arranged in the hydrogen peroxide cathode cell.

6. The bioelectrochemical device for treating slicing wastewater according to claim 5, characterized in that: The Fenton reaction tank (3) is connected to an acid storage tank (22).

7. The bioelectrochemical device for treating slicing wastewater according to claim 6, characterized in that: The coagulation reaction tank (4) is connected to a PAM storage tank (26), a PAC storage tank (27) and an alkali storage tank (28).

8. The bioelectrochemical device for treating slicing wastewater according to claim 7, characterized in that: The Fenton reaction tank (3) is provided with a Fenton pH meter (23), a Fenton COD meter (24) and a stirrer (25).

9. The bioelectrochemical device for treating slicing wastewater according to claim 8, characterized in that: The coagulation reaction tank (4) is provided with a coagulation pH meter (29) and a coagulation COD meter (30).

10. The bioelectrochemical device for treating slicing wastewater according to claim 9, characterized in that: The sludge sedimentation tank (5) is provided with a sludge level meter (32).

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