Microbial electrochemical coupling hydrolytic acidification reactor

Abstract

The utility model relates to the field of anaerobic biological treatment of industrial wastewater, and provides a microbial electrochemical coupling hydrolytic acidification reactor which comprises a reactor tower body, and a water distribution device, a cathode filler, an anode sieve plate and a three-phase separator which are arranged in the reactor tower body at intervals from bottom to top, the cathode filler is connected with the cathode of the direct-current power supply, the anode sieve plate is connected with the anode of the direct-current power supply, the top of the reactor tower body is provided with a wastewater outflow port and a biogas cabinet, the bottom of the reactor tower body is provided with a water inlet and is connected with a water inlet pump, and the water inlet pump is connected with a water distribution device through the water inlet. Through the design of the microbial electrochemical coupling hydrolytic acidification reactor, the dyeing and finishing wastewater treatment efficiency is remarkably improved, the hydraulic retention time is shortened, the environmental protection investment and operation cost are reduced, and meanwhile, the stability of the treatment effect is improved.

Description

Technical Field

[0001] This utility model relates to the field of anaerobic biological treatment of industrial wastewater, specifically to a microbial electrochemical coupled hydrolysis acidification reactor. Background Technology

[0002] In the dyeing and finishing industry, the wastewater discharged from desizing and dyeing processes is characterized by high salt content, high concentration, and high color intensity. The main pollutants are azo dyes, anthraquinone dyes, and PVA sizing agents, which are difficult to biodegrade and are high-molecular organic compounds.

[0003] Traditional hydrolysis acidification reactors, such as UASB anaerobic reactors, have drawbacks when treating desizing wastewater and dyeing residues. These drawbacks include the large molecular weight of pollutants, which are mostly cyclic structures, resulting in complex molecular structures, difficulties in releasing electrons, low electron transfer and utilization rates, and long hydrolysis acidification reaction times. Consequently, they require large reactor volumes and hydraulic retention times that often need to be 7-15 days or even longer, leading to high environmental investment, high operating costs, and unstable treatment effects. Utility Model Content

[0004] To address the problems of slow hydrolysis and acidification reaction rates of polymeric pollutants, difficulty in pollutant degradation, high investment costs, and secondary pollution caused by hydrogen sulfide emissions in existing technologies, this invention provides a microbial electrochemical coupled hydrolysis and acidification reactor. The specific technical solution is as follows:

[0005] A microbial electrochemical coupled hydrolysis acidification reactor includes a reactor tower and a water distribution device, negative electrode packing, positive electrode sieve plate, and three-phase separator arranged at intervals from bottom to top in the reactor tower. The negative electrode packing is located in the lower middle part of the reactor tower, the positive electrode sieve plate is located in the middle part of the reactor tower, and the three-phase separator is located in the upper middle part of the reactor tower. The negative electrode packing is connected to the negative terminal of a DC power supply, and the positive electrode sieve plate is connected to the positive terminal of a DC power supply. The top of the reactor tower is provided with a wastewater outflow port and a biogas tank, and the bottom of the reactor tower is provided with a water inlet connected to a water inlet pump. The water inlet pump is connected to the water distribution device through the water inlet.

[0006] In a preferred embodiment, the side of the reactor tower is provided with a wastewater return port, which is connected to the inlet pump, and the height of the wastewater return port is located between the three-phase separator and the positive electrode sieve plate.

[0007] In a preferred embodiment, the negative electrode filler is composed of an inner core wrapped with annular fiber bundles, the inner core being a 12K carbon fiber rope, and the annular fiber bundles being a composite of polypropylene fibers and polyvinylidene chloride fibers.

[0008] In a preferred embodiment, the wastewater outlet is connected to an effluent weir, which is located inside the reactor tower.

[0009] In a preferred embodiment, the reactor tower body is provided with a positive electrode connector and a negative electrode connector on its outer side, and the positive electrode sieve plate and the negative electrode packing are respectively connected to a DC power supply through the positive electrode connector and the negative electrode connector.

[0010] In a preferred embodiment, the reactor tower is provided with a maintenance manhole on its side.

[0011] In a preferred embodiment, a lightning rod is provided at the top of the reactor tower, and a grounding device is provided at the bottom of the reactor tower.

[0012] The beneficial effects of this utility model are:

[0013] This invention utilizes negative electrode packing as an electron donor for electrochemically active microorganisms to catalytically transform recalcitrant organic pollutants such as azo dyes, anthraquinone dyes, and PVA slurries in dyeing and finishing wastewater. Under the action of an external electric field, it promotes the release of electrons from organic pollutants, improves electron transfer efficiency, accelerates the oxidation-reduction process of intermediate metabolites, and improves the treatment efficiency of traditional hydrolysis acidification reactors. Attached Figure Description

[0014] Figure 1 This is a front structural diagram of the present invention.

[0015] In the diagram: 1. Reactor tower; 2. Inlet pump; 3. Water distribution device; 4. Manhole; 5. Wastewater return port; 6. Wastewater outflow port; 7. Outflow weir; 8. Three-phase separator; 9. DC power supply; 10. Negative electrode packing; 11. Negative electrode connector; 12. Positive electrode screen; 13. Positive electrode connector; 14. Biogas holder; 15. Lightning rod; 16. Grounding device. Detailed Implementation

[0016] The following will be combined with the present invention. Figure 1 The technical solutions in the embodiments of this utility model are clearly and completely described herein. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. Based on the embodiments of this utility model, all other embodiments obtained by those skilled in the art without creative effort are within the protection scope of this utility model.

[0017] This utility model discloses a microbial electrochemical coupled hydrolysis acidification reactor, which is used to solve the problems existing in the prior art:

[0018] like Figure 1As shown, this utility model discloses a microbial electrochemical coupling hydrolysis acidification reactor, comprising a reactor tower 1 and a water distribution device 3, a negative electrode packing 10, a positive electrode sieve plate, and a three-phase separator 8, which are spaced apart in the reactor tower 1 from bottom to top. The negative electrode packing 10 is composed of an inner core wrapped with a ring-shaped fiber bundle. The inner core is a 12K carbon fiber rope with a porosity greater than 55% and good conductivity. The ring-shaped fiber bundle is composed of polypropylene fiber and polyvinylidene chloride fiber. The composite fiber material has been modified and deformed in multiple ways to greatly increase the specific surface area, has hydrophilicity and positive charge, strong biocompatibility, and is more conducive to microbial attachment.

[0019] The negative electrode packing 10 is located in the lower middle part of the reactor tower 1, the positive electrode sieve plate is located in the middle part of the reactor tower 1, and the three-phase separator 8 is located in the upper middle part of the reactor tower 1. The negative electrode packing 10 is connected to the negative terminal of the DC power supply 9, and the positive electrode sieve plate is connected to the positive terminal of the DC power supply 9. The outer side of the reactor tower 1 is provided with a positive electrode connector 13 and a negative electrode connector 11. The positive electrode sieve plate and the negative electrode packing 10 are connected to the DC power supply 9 through the positive electrode connector 13 and the negative electrode connector 11, respectively. The output voltage of the DC power supply 9 is 0-6V or 0-15V, and the output current is 0-1A or 0-2A / 0-6A. The DC power supply 9 can be selected to have multiple power supplies of the same specification connected in parallel for capacity expansion or a single high-power power supply connected in parallel for multiple outputs.

[0020] The reactor tower 1 has a wastewater outflow port 6 and a biogas tank 14 at the top. The reactor tower 1 has a water inlet at the bottom and is connected to a water pump 2. The water pump 2 is connected to a water distribution device 3 through the water inlet. The reactor tower 1 has a wastewater return port 5 on the side. The wastewater return port 5 is connected to the water pump 2. The height of the wastewater return port 5 is between the three-phase separator 8 and the positive electrode screen plate. The wastewater outflow port 6 is connected to an outlet weir 7. The outlet weir 7 is located inside the reactor tower 1. The reactor tower 1 has a maintenance manhole 4 on the side. The reactor tower 1 also has a lightning rod 15 at the top and a grounding device 16 at the bottom.

[0021] The specific implementation process of this utility model is as follows:

[0022] Process 1: Dyeing and finishing wastewater and reactor circulating water are mixed in the pipeline before the inlet pump 2 and continuously flow into the water distribution device 3 at the bottom of the reactor, where the wastewater and anaerobic sludge are fully mixed.

[0023] Process Two: Under the action of an external DC power supply 9, various electrochemically active anaerobic microorganisms accumulate in the lower part of the reactor, and an electrochemically active biofilm is formed on the negative electrode packing 10. A multiphase interface of wastewater-sludge (microorganisms)-electrode is formed near the negative electrode packing 10. Electron transfer occurs between pollutants in the wastewater and electrochemically active microorganisms and negative electrode packing 10, completing the hydrolysis and reduction reactions of recalcitrant organic pollutants (such as azo dyes, anthraquinone dyes, polyvinyl alcohol PVA chemical slurry, etc.) or inorganic pollutants (such as sulfate ions) in the wastewater. Macromolecular organic matter is hydrolyzed into small molecule organic matter, aromatic cyclic molecules are decomposed into straight-chain molecules, long chains are decomposed into short chains, proteins are hydrolyzed into short peptides and amino acids, and inorganic sulfates are reduced to elemental sulfur and H₂S. - S 2- wait;

[0024] Process 3: The hydrolyzed small molecule compounds are further broken down into simpler compounds by acidifying bacteria in the reactor and secreted extracellularly. These simpler compounds, such as volatile fatty acids, alcohols, and lactic acid, are ultimately decomposed by fermenting bacteria in the reactor into methane, carbon dioxide, water, hydrogen, etc., generating electrons that are secreted extracellularly; sulfate reduction products, elemental sulfur and HS-1, S-2, etc., are oxidized as electron donors and release electrons.

[0025] Process 4: When electrochemically active microorganisms pass through the positive electrode screen 12, extracellular electrons are transferred to the positive electrode screen 12 directly or indirectly, and then transferred to the negative electrode packing 10 through an external power supply.

[0026] Process 5: The treated wastewater is separated into liquid, solid and gas phases by the three-phase separator 8. The sludge is retained, and biogases such as methane and carbon dioxide are discharged into the biogas tank 14. Part of the wastewater flows out through the wastewater outlet 6, and part flows back through the wastewater return outlet 5 to mix with the raw water and enter the water distribution device 3 at the bottom of the reactor via the inlet pump 2.

[0027] This invention significantly improves the treatment efficiency of dyeing and finishing wastewater, shortens the hydraulic retention time, reduces environmental protection investment and operating costs, and improves the stability of treatment effect through the design of a microbial electrochemical coupled hydrolysis acidification reactor.

[0028] The above description is only a preferred embodiment of the present utility model. Although the description is relatively specific and detailed, it should not be construed as a limitation on the scope of the utility model patent. It should be noted that without departing from the concept of the present utility model, several improvements and modifications can be made, and these all fall within the protection scope of the present utility model.

Claims

1. A microbial electrochemical coupled hydrolysis acidification reactor, characterized in that, The reactor includes a reactor tower and a water distribution device, negative electrode packing, positive electrode sieve plate, and three-phase separator arranged at intervals from bottom to top within the reactor tower. The negative electrode packing is located in the lower middle part of the reactor tower, the positive electrode sieve plate is located in the middle part of the reactor tower, and the three-phase separator is located in the upper middle part of the reactor tower. The negative electrode packing is connected to the negative terminal of a DC power supply, and the positive electrode sieve plate is connected to the positive terminal of a DC power supply. The top of the reactor tower is provided with a wastewater outflow outlet and a biogas tank, and the bottom of the reactor tower is provided with a water inlet connected to a water inlet pump. The water inlet pump is connected to the water distribution device through the water inlet.

2. The microbial electrochemical coupled hydrolysis acidification reactor according to claim 1, characterized in that, The reactor tower is provided with a wastewater return port on its side, which is connected to the inlet of the water pump. The height of the wastewater return port is located between the three-phase separator and the positive electrode sieve plate.

3. The microbial electrochemical coupled hydrolysis acidification reactor according to claim 1, characterized in that, The wastewater outlet is connected to the effluent weir, which is located inside the reactor tower.

4. The microbial electrochemical coupled hydrolysis acidification reactor according to claim 1, characterized in that, The reactor tower is equipped with a positive electrode connector and a negative electrode connector on its outer side. The positive electrode sieve plate and the negative electrode packing are connected to a DC power supply through the positive electrode connector and the negative electrode connector, respectively.

5. The microbial electrochemical coupled hydrolysis acidification reactor according to claim 1, characterized in that, The reactor tower is equipped with a maintenance manhole on its side.

6. The microbial electrochemical coupled hydrolysis acidification reactor according to claim 1, characterized in that, The reactor tower is also equipped with a lightning rod at the top and a grounding device at the bottom.

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