Device and method for biologically electrochemically producing high-value products from wastewater

Abstract

The present invention discloses a device for biologically and electrochemically producing high-value products from wastewater, which comprises an acid-producing reactor, an electrolysis system and a concentration system. The acid-producing reactor includes a pool body and biological sludge disposed in the pool body, and the biological sludge is used for hydrolyzing wastewater to produce organic acids and hydrogen. The electrolysis system includes an electrolytic cell, a cathode and an anode. After the cathode and the anode are electrified, the organic acids in the electrolytic cell are electrolyzed, and then carbon dioxide and alkane gases are obtained at the anode, and hydrogen is obtained at the cathode. The concentration system includes a membrane module, a circulation pipeline and a circulation pump. The present invention also discloses a method for biologically and electrochemically producing high-value products from wastewater. For the above-mentioned device and method for biologically and electrochemically producing high-value products, the transfer and concentration of organic acids can be completed without high membrane filtration power consumption, the acid production efficiency is improved, the working states of the two systems are stable, and no additional acid or alkali agents need to be added.

Description

Technical Field

[0001] The present invention relates to the technical field of wastewater treatment, and particularly relates to a device and a method for biologically and electrochemically producing high-value products from wastewater. Background Art

[0002] In recent years, with the continuous development of technology and the increasing attention to environmental issues, adopting reasonable and effective methods to treat livestock and poultry wastewater has become a hot spot in technology research and development.

[0003] Wastewater returning to the field is a traditional treatment mode for livestock and poultry breeding wastewater. This method is restricted by natural conditions such as land and environment, and the treatment is not sufficient. Long-term use will damage the water ecological balance, cause soil compaction, and affect the growth of crops. Anaerobic process, aerobic process, and hybrid process are the main industrialized livestock and poultry wastewater treatment processes. Among them, anaerobic treatment processes include anaerobic biological filter, anaerobic baffled reactor, hybrid anaerobic reactor, upflow anaerobic sludge bed reactor, and composite anaerobic reactor, etc. At present, the anaerobic digestion treatment process is simple and is widely used in the treatment of breeding wastewater. It can remove about 80% of the organic matter dissolved in the wastewater, kill the infectious bacteria in the wastewater, and at the same time, biogas can be recovered.

[0004] However, in the anaerobic treatment process, due to the slow growth of methanogens and their large sensitivity to temperature, the reaction conditions of methanogens generally require medium temperature of 35 - 37°C or high temperature of 55 - 57°C. And increasing the reaction temperature of sewage requires consuming a large amount of heat, and the heat stored in the temperature of the reacted liquid is difficult to recover. Moreover, only 1 - 2 cubic meters of biogas can be produced per cubic meter of the pool body per day, and the productivity is low. Summary of the Invention

[0005] Based on this, in view of the problems of the existing anaerobic wastewater treatment process, which requires consuming a large amount of heat and has low production efficiency, it is necessary to provide a device and a method for biologically and electrochemically producing high-value products.

[0006] A device for biologically and electrochemically producing high-value products from wastewater includes:

[0007] An acid-producing reactor, including a pool body and biological sludge disposed in the pool body, and the biological sludge is used for hydrolyzing wastewater to produce organic acids and hydrogen;

[0008] An electrolysis system, including an electrolytic cell, a cathode, and an anode. The cathode and the anode are disposed in the electrolytic cell. After the cathode and the anode are electrified, the organic acids in the electrolytic cell are electrolyzed, and then carbon dioxide and alkane gases are obtained at the anode, and hydrogen is obtained at the cathode; and

[0009] The concentration system includes a membrane module, a circulation pipeline and a circulation pump. The membrane module is arranged in the pool body. Both groups of circulation pipelines are connected to the pool body and the electrolytic cell. The two groups of circulation pipelines are respectively connected to both ends of the membrane module. The circulation pump is installed on the circulation pipeline.

[0010] In one embodiment, the pool body is provided with a water inlet and a water outlet. The height of the water inlet on the pool body is lower than that of the water outlet.

[0011] In one embodiment, the acid-producing reactor further includes a gas collection pipe for collecting hydrogen.

[0012] In one embodiment, a three-phase separator is arranged in the pool body.

[0013] In one embodiment, the electrolysis system further includes an anode gas collection pipe for collecting anode gas and a cathode gas collection pipe for collecting cathode gas.

[0014] In one embodiment, the concentration system further includes an adsorbent. The adsorbent circulates in the circulation pipeline to adsorb the organic acid in the pool body and is desorbed in the electrolytic cell.

[0015] In one embodiment, the adsorbent is macroporous resin.

[0016] In one embodiment, a stirring mechanism is arranged in the pool body; and / or

[0017] A stirring mechanism is arranged in the electrolytic cell.

[0018] A method for biologically and electrochemically producing high-value products from wastewater uses the device for biologically and electrochemically producing high-value products from wastewater according to any one of the above, and includes the following steps:

[0019] Introduce the wastewater into the pool body. The biological sludge hydrolyzes the wastewater to produce organic acid and hydrogen, and collect the hydrogen generated during the hydrolysis process;

[0020] The circulation pump pumps the electrolyte in the electrolytic cell into the membrane module through the circulation pipeline. The organic acid in the pool body migrates into the membrane module under the action of the pH difference and enters the electrolytic cell through the circulation pipeline;

[0021] After the cathode and anode are electrified, electrolyze the organic acid in the electrolytic cell to obtain carbon dioxide and alkane gas at the anode and hydrogen at the cathode.

[0022] In one embodiment, an adsorbent is provided in the circulation pipeline. The adsorbent circulates in the circulation pipeline to adsorb the organic acid in the pool body and is desorbed in the electrolytic cell.

[0023] The above-mentioned device and method for biologically and electrochemically producing high-value products have at least the following advantages:

[0024] (1) The acid-producing reactor is transferred and concentrated under conditions of no phase change and no pressure difference, improving the efficiency of acid production.

[0025] (2) The pH difference between the pool body and the electrolytic cell is used to drive the transfer of organic acids to the electrolytic cell, and the adsorption of organic acids by macroporous resin is utilized to further reduce the concentration of organic acids inside and outside the membrane module, driving the transfer of organic acids to the electrolytic cell. The transfer and concentration of organic acids can be completed without high membrane filtration power consumption.

[0026] (3) Compared with traditional electrolysis, the raw materials consumed and products in the electrolysis process are in an equilibrium state, having no impact on the ionization of water. The working states of the two systems are stable, and no additional acid or alkali agents need to be added.

[0027] (4) The reaction conditions of methanogens generally require medium temperature of 35 - 37°C or high temperature of 55 - 57°C. Increasing the reaction temperature of sewage requires a large amount of heat, and the heat stored in the temperature of the liquid after the reaction is difficult to recover. In the present invention, the processes of hydrolysis and electrolysis do not require medium temperature or high temperature conditions, which can reduce the energy demand.

[0028] (5) The metabolic rate of methanogens is the main bottleneck and limiting link in biological anaerobic digestion. In the present invention, since the generation periods of hydrolysis and acid-producing bacteria are relatively short, often measured in minutes and hours, and the electrolytic gas production process is also relatively fast, the efficiency of wastewater treatment and production of useful products can be improved. Description of the Drawings

[0029] In order to more clearly illustrate the specific embodiments of the present invention, the drawings required for use in the specific embodiments will be briefly introduced below. In all the drawings, the components or parts are not necessarily drawn according to the actual ratio.

[0030] Figure 1 It is a schematic structural diagram of a device for biologically and electrochemically producing high-value products from wastewater in one embodiment;

[0031] Figure 2 It is a flowchart of a method for biologically and electrochemically producing high-value products from wastewater in one embodiment.

[0032] Reference Signs:

[0033] 10 - Acid production reactor, 11 - Tank body, 12 - Biological sludge, 13 - Inlet, 14 - Outlet, 15 - Gas collection pipe, 16 - Three - phase separator, 20 - Electrolysis system, 21 - Electrolytic cell, 22 - Cathode, 23 - Anode, 24 - Power supply, 25 - Anode gas collection pipe, 26 - Cathode gas collection pipe, 30 - Concentration system, 31 - Membrane module, 32 - Circulation pipeline, 33 - Circulation pump, 34 - Adsorbent. Detailed implementation manners

[0034] To make the above - mentioned objects, features and advantages of the present invention more obvious and understandable, the following will describe in detail the specific implementation manners of the present invention with reference to the accompanying drawings. Many specific details are set forth in the following description in order to fully understand the present invention. However, the present invention can be implemented in many other ways different from those described herein, and those skilled in the art can make similar improvements without departing from the connotation of the present invention. Therefore, the present invention is not limited by the specific implementations disclosed below.

[0035] It should be noted that when an element is referred to as being "fixed to" another element, it can be directly on the other element or there can also be a middle element. When an element is considered to be "connected" to another element, it can be directly connected to the other element or there may be a middle element at the same time. The terms "vertical", "horizontal", "left", "right" and similar expressions used herein are only for the purpose of illustration and do not represent the only implementation manner.

[0036] Unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by those skilled in the technical field to which the present invention belongs. The terms used in the description of the present invention herein are only for the purpose of describing specific embodiments and are not intended to limit the present invention.

[0037] Please refer to Figure 1 , in a wastewater bio - electro - chemical device for producing high - value products in one embodiment, it includes an acid production reactor 10, an electrolysis system 20 and a concentration system 30.

[0038] The acid production reactor 10 includes a tank body 11 and biological sludge 12 provided in the tank body 11. The biological sludge 12 can hydrolyze the wastewater in the tank body 11 to produce organic acids and hydrogen.

[0039] Specifically, the biological sludge 12 contains hydrolytic acid - producing bacteria. The hydrolytic acid - producing bacteria can hydrolyze suspended organic matter and macromolecular substances, such as carbohydrates, proteins and lipids, etc., into small molecules through microbial extracellular enzymes. The small - molecule organic matter is converted into organic acids under the action of acid - forming bacteria. Since the generation periods of hydrolysis and acid - producing bacteria are relatively short, often measured in minutes and hours, this hydrolysis - acidification process is rapid.

[0040] In one embodiment, the organic acid is a small molecule organic acid, such as acetic acid, propionic acid, etc. Of course, in other embodiments, the organic acid can also be other types of small molecule organic acids.

[0041] In one embodiment, the pool body 11 is provided with a water inlet 13 and a water outlet 14. Wastewater can enter the pool body 11 through the water inlet 13. After hydrolysis under the action of biological sludge 12, the purified wastewater is discharged from the water outlet 14. In this embodiment, the height of the water inlet 13 on the pool body 11 is lower than that of the water outlet 14. The wastewater enters from the bottom of the pool body 11 and is discharged from the top of the pool body 11 after purification. On the one hand, the bottom inlet of the wastewater can stir the biological sludge 12 and increase the contact area between the wastewater and the biological sludge 12. On the other hand, it can increase the residence time of the wastewater in the pool body 11, so as to improve the purification effect of the wastewater.

[0042] In one embodiment, the acidogenic reactor 10 further includes a gas collection pipe 15, which is used to collect the hydrogen generated during the hydrolysis process to realize the collection and utilization of hydrogen. Further, a three-phase separator 16 is provided in the pool body 11. The three-phase separator 16 is used to separate the hydrolysis products into gas, liquid and solid. The solid sludge separated by the three-phase separator 16 falls back to the bottom of the pool. The separated liquid is the purified wastewater and flows out through the water outlet 14. The separated hydrogen is collected through the gas collection pipe 15.

[0043] The electrolysis system 20 includes an electrolytic cell 21, a cathode 22 and an anode 23. The cathode 22 and the anode 23 are arranged in the electrolytic cell 21. After the cathode 22 and the anode 23 are energized, the organic acid in the electrolytic cell 21 is electrolyzed. Then, carbon dioxide and alkane gas are obtained at the anode 23, and hydrogen is obtained at the cathode 22.

[0044] In one embodiment, the electrolysis system 20 further includes a power supply 24. The positive pole of the power supply 24 is connected to the anode 23, and the negative pole of the power supply 24 is connected to the cathode 22. The power supply 24 is a DC power supply, and the electrolysis voltage is 0.2 - 12V DC. The electrolysis electrode can be a titanium electrode or a titanium-coated ruthenium-iridium electrode.

[0045] In one embodiment, the electrolysis system 20 further includes an anode gas collection pipe 25 and a cathode gas collection pipe 26. The anode gas collection pipe 25 is correspondingly arranged at the anode 23, and the cathode gas collection pipe 26 is correspondingly arranged at the cathode 22. The anode gas collection pipe 25 is used to collect the carbon dioxide and alkane gas generated at the anode 23, and the cathode gas collection pipe 26 is used to collect the hydrogen generated at the cathode 22.

[0046] In one embodiment, the organic acid is acetic acid. During electrolysis, carbon dioxide and ethane can be obtained at the anode 23, and hydrogen can be obtained at the cathode 22. The relationship among the three is close to 2:1:1 in the electrolysis mode. Specifically, the chemical reaction formula during electrolysis is:

[0047]

[0048] Of course, in other embodiments, depending on the type of organic acid, different types of alkane gases are generated on the anode 23. For example, when the organic acid is propionic acid, the alkane gas generated on the anode 23 is butane.

[0049] The concentration system 30 includes a membrane module 31, a circulation pipeline 32, and a circulation pump 33. The membrane module 31 is arranged in the tank body 11. Both groups of circulation pipelines 32 are connected to the tank body 11 and the electrolytic cell 21. The two groups of circulation pipelines 32 are respectively connected to both ends of the membrane module 31, and the circulation pump 33 is installed on the circulation pipeline 32.

[0050] Among them, the circulation pump 33 can pump the electrolyte in the electrolytic cell 21 into the membrane module 31 through the circulation pipeline 32. Due to the difference in the concentration and pH of the organic acid on both sides of the membrane module 31, it promotes the forward movement of the organic acid in the tank body 11 into the membrane and enters the electrolytic cell 21 through the circulation pipeline 32. Subsequently, the electrolysis system 20 electrolyzes the organic acid.

[0051] On the premise of no transmembrane pressure difference (extra filtration power), the organic acid product of the acid-producing reactor 10 is transferred, and at the same time, the acid-producing reaction continues. During the electrolysis process, because the decomposition of the organic acid causes the pH value of the electrolyte to rise, the difference in the pH value of the electrolyte in the membrane module 31 and the pH value of the mixed solution in the outer tank body 11 of the membrane increases, further increasing the migration speed of the organic acid into the membrane.

[0052] In one embodiment, the membrane module 31 preferably adopts a microfiltration tube membrane module, and the microfiltration tube membrane module 31 is installed vertically, which is convenient for the migration of the organic acid into the membrane. It can be understood that in other embodiments, the membrane module 31 can also adopt a plate membrane module or a spiral wound membrane module, etc.

[0053] In one embodiment, the concentration system 30 further includes an adsorbent 34. The adsorbent 34 can circulate in the electrolytic cell 21, the circulation pipeline 32, the membrane module 31, and the circulation pipeline 32 under the action of the circulation pump 33. When the adsorbent 34 circulates into the membrane module 31, the adsorbent 34 can adsorb the organic acid in the tank body 11, enrich and concentrate the organic acid, and finally circulate into the electrolytic cell 21 for desorption.

[0054] Among them, the adsorbent 34 enriches and concentrates the organic acid in the electrolyte, reduces the concentration of the organic acid in the electrolyte in the membrane, increases the mass transfer rate of the organic acid from outside the membrane to inside the membrane, and at the same time, the adsorbent 34 desorbs the organic acid in the electrolytic cell 21, increasing the concentration of the organic acid and the electrolysis efficiency in the electrolytic cell 21.

[0055] In one embodiment, the adsorbent 34 is macroporous resin. It can be understood that in other embodiments, the adsorbent 34 can also be made of other materials as long as it can adsorb organic acids and does not participate in the electrolysis reaction. A stirring mechanism is provided in the cell body 11 and in the electrolytic cell 21, which can increase the diffusion rate of the organic acid, improve the migration rate of the organic acid and the electrolysis efficiency.

[0056] Please refer to Figure 2 , on the other hand, the present invention also provides a method for biologically and electrochemically producing high-value products from wastewater, using the above-mentioned device for biologically and electrochemically producing high-value products from wastewater. Specifically, the method includes the following steps:

[0057] Step S10: Introduce the wastewater into the cell body 11, and the biological sludge 12 hydrolyzes the wastewater to produce organic acids and hydrogen, and collect the hydrogen generated during the hydrolysis process.

[0058] Specifically, the wastewater mainly uses high-concentration organic wastewater, and it is preferred to select wastewater with a COD greater than 5000, such as aquaculture wastewater, etc. Of course, it can be understood that in other embodiments, the wastewater can also be other types of wastewater as long as the wastewater can hydrolyze to produce organic acids and hydrogen.

[0059] The wastewater enters the cell body 11 through the water inlet 13. The hydrolytic acidogenic bacteria in the biological sludge 12 can hydrolyze suspended organic matter and macromolecular substances, such as carbohydrates, proteins, and lipids, into small molecules through microbial extracellular enzymes, and the small molecule organic matter is converted into organic acids and hydrogen under the action of acidifying bacteria. Since the generation periods of hydrolysis and acidogenic bacteria are relatively short, often measured in minutes and hours, this hydrolysis and acidification process is rapid.

[0060] In one embodiment, the organic acid is a small molecule organic acid, such as acetic acid, propionic acid, butyric acid, etc. Of course, in other embodiments, the organic acid can also be other types of small molecule organic acids. The hydrogen generated by decomposition is collected and utilized by the gas collection tube 15.

[0061] Step S120: The circulation pump 33 pumps the electrolyte in the electrolytic cell 21 into the membrane module 31 through the circulation pipeline 32. The organic acid in the cell body 11 migrates into the membrane module 31 under the action of the pH difference and enters the electrolytic cell 21 through the circulation pipeline 32.

[0062] Specifically, the circulation pump 33 pumps the electrolyte in the electrolytic cell 21 into the membrane module 31 through the circulation pipeline 32. By virtue of the difference in the concentration and pH of the organic acid in the fluids on both sides of the membrane, it promotes the migration of the organic acid in the acid-producing reactor 10 into the membrane and enriches it in the macroporous resin in the circulating liquid, and finally enters the electrolytic cell 21 along with the circulating liquid. On the premise of no transmembrane pressure difference (extra filtration power), the organic acid product of the acid-producing reactor 10 is enriched and transferred, while promoting the continuous progress of the acid-producing reaction.

[0063] Step S130: After the cathode 22 and the anode 23 are energized, the organic acid in the electrolytic cell 21 is electrolyzed, carbon dioxide and alkane gas are obtained on the anode 23, and hydrogen is obtained on the cathode 22.

[0064] Specifically, direct current is passed for electrolysis, and the electrolysis voltage is 0.2 - 12V DC. Carbon dioxide and alkane gas can be obtained on the anode 23, and hydrogen can be obtained on the cathode 22. The principle is that the organic acid completes the decarboxylation process during electrolysis, and the remaining free radicals combine to obtain alkane products.

[0065] Among them, the carbon dioxide and alkane gas on the anode 23 are collected by the anode gas collecting pipe 25, and the hydrogen on the cathode 22 is collected by the cathode gas collecting pipe 26. The pH in the cell body 11 of the acid-producing reactor 10 ≤ 4, and the pH of the electrolytic cell 21 ≥ 7.

[0066] In one embodiment, the organic acid is acetic acid. During electrolysis, carbon dioxide and ethane can be obtained on the anode 23, and hydrogen can be obtained on the cathode 22. The relationship among the three is close to 2:1:1 in the electrolysis method. Specifically, the chemical reaction formula during electrolysis is:

[0067]

[0068] Of course, in other embodiments, with different types of organic acids, the types of alkane gases generated on the anode 23 are different. For example, when the organic acid is propionic acid, the alkane gas generated on the anode 23 is butane.

[0069] The above device and method for bio-electrochemically producing high-value products have at least the following advantages:

[0070] (1) Transfer and concentration are carried out on the acid-producing reactor 10 under the conditions of no phase change and no pressure difference, improving the acid-producing efficiency.

[0071] (2) Utilize the pH difference between the cell body 11 and the electrolytic cell 21 to drive the transfer of the organic acid to the electrolytic cell 21. Utilize the adsorption effect of the macroporous resin on the organic acid to further reduce the concentration of the organic acid inside and outside the membrane module 31, and drive the transfer of the organic acid to the electrolytic cell 21. The transfer and concentration of the organic acid can be completed without consuming high-cost membrane filtration power.

[0072] (3) Compared with traditional electrolysis, the raw materials consumed and products produced during the electrolysis process are in an equilibrium state, having no impact on the ionization equilibrium of water. The working states of the two systems are stable, and no additional acid or alkali agents need to be added. For example, in the traditional process of producing chlorine by electrolyzing brine, due to the evolution of hydrogen, the concentration of NaOH in the solution of the electrolytic cell 21 gradually increases, and the rapid rise in pH directly disrupts the normal progress of the electrolysis reaction.

[0073] (4) The reaction conditions of methanogens generally require medium temperature of 35 - 37 °C or high temperature of 55 - 57 °C. Raising the reaction temperature of the sewage requires a large amount of heat, and the heat stored in the temperature of the liquid material after the reaction is difficult to recover. In the present invention, the hydrolysis and electrolysis processes do not require medium or high temperature conditions, which can reduce the energy demand.

[0074] (5) The metabolic rate of methanogens is the main bottleneck and limiting link in biological anaerobic digestion. In the present invention, since the generation periods of hydrolytic bacteria and acid - producing bacteria are relatively short, often measured in minutes and hours, and the electrolytic gas - producing process is also relatively fast, the efficiency of wastewater treatment and production of useful products can be improved.

[0075] The above - mentioned embodiments are only used to illustrate the technical solutions of the present invention, rather than to limit it; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that: they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent substitution on some or all of the technical features; and these modifications or substitutions do not make the essence of the corresponding technical solutions deviate from the scope of the technical solutions of the embodiments of the present invention, and they should all be covered by the scope of the claims and the description of the present invention.

Claims

1. An apparatus for biologically and electrochemically producing high-value products from wastewater, characterized in that, Comprising: An acid-producing reactor, including a pool body and biological sludge disposed within the pool body, the biological sludge being used to hydrolyze wastewater to produce organic acids and hydrogen; An electrolysis system, including an electrolytic cell, a cathode, and an anode, the cathode and the anode being disposed within the electrolytic cell, and after the cathode and the anode are energized, electrolyzing the organic acids within the electrolytic cell, thereby obtaining carbon dioxide and alkane gases at the anode and hydrogen at the cathode; And A concentration system, including a membrane module, a circulation pipeline, and a circulation pump, the membrane module being arranged within the pool body, two groups of circulation pipelines both connecting the pool body and the electrolytic cell, the two groups of circulation pipelines respectively connecting both ends of the membrane module, and the circulation pump being installed on the circulation pipeline; the circulation pump pumps the electrolyte within the electrolytic cell into the membrane module through the circulation pipeline, and the organic acids within the pool body migrate into the membrane module under the action of a pH difference and enter the electrolytic cell through the circulation pipeline; The concentration system further includes an adsorbent, the adsorbent circulating within the circulation pipeline to adsorb the organic acids within the pool body and desorb at the electrolytic cell.

2. The device for biologically and electrochemically producing high-value products from wastewater according to claim 1, characterized in that, The pool body is provided with a water inlet and a water outlet, and the height of the water inlet on the pool body is lower than that of the water outlet.

3. The device for biologically and electrochemically producing high-value products from wastewater according to claim 1, characterized in that, The acid-producing reactor further includes a gas collection pipe for collecting hydrogen.

4. The device for biologically and electrochemically producing high-value products from wastewater according to claim 1, characterized in that, A three-phase separator is disposed within the pool body.

5. The device for biologically and electrochemically producing high-value products from wastewater according to claim 1, characterized in that, The electrolysis system further includes an anode gas collection pipe for collecting anode gas and a cathode gas collection pipe for collecting cathode gas.

6. The device for biologically and electrochemically producing high-value products from wastewater according to claim 1, wherein The adsorbent is macroporous resin.

7. The device for biologically and electrochemically preparing high-value products from wastewater according to claim 1, characterized in that, A stirring mechanism is disposed within the pool body; and / or A stirring mechanism is disposed within the electrolytic cell.

8. A method for biologically and electrochemically producing high-value products from wastewater, using the device for biologically and electrochemically producing high-value products from wastewater according to any one of claims 1-7, characterized in that, Including the following steps: Introduce wastewater into the pool body, the biological sludge hydrolyzes the wastewater to produce organic acids and hydrogen, and collect the hydrogen generated during the hydrolysis process; The circulation pump pumps the electrolyte within the electrolytic cell into the membrane module through the circulation pipeline, and the organic acids within the pool body migrate into the membrane module under the action of a pH difference and enter the electrolytic cell through the circulation pipeline; After the cathode and the anode are energized, electrolyze the organic acids within the electrolytic cell to obtain carbon dioxide and alkane gases at the anode and hydrogen at the cathode.

9. The method for biologically and electrochemically producing high-value products from wastewater according to claim 8, wherein, An adsorbent is provided within the circulation pipeline, and the adsorbent circulates within the circulation pipeline to adsorb the organic acids within the pool body and desorb at the electrolytic cell.

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