A high ammonia wastewater resource energy recovery system

Abstract

The present application relates to a kind of high ammonia wastewater resource energy recovery system, including anaerobic reactor, anode chamber, cathode chamber, electrode sheet, cation exchange membrane, anion exchange membrane, anaerobic reactor includes, located in the upper three-phase separator, its upper portion is provided with exhaust port;Cylinder, for the cuboid structure of two sides, bottom opening, its upper portion is provided with water outlet, backflow port, ion exchange membrane is arranged between the anode chamber, cathode chamber connected, the upper portion of cylinder interior is arc structure, lower portion is equipped with sampling port;Water distribution plate, upper portion is connected with cylinder, lower portion is connected with water distributor, the upper portion of water distributor is connected with water distribution plate, bottom is equipped with inlet, the inlet is connected with peristaltic pump, the device of the present application is with anaerobic treatment high ammonia wastewater as object, and electrode is separated, avoid oxygen interference;Under the action of electrode electrolysis, organic matter in cathode area is converted into methane and ammonia, and sulfur ion generates sulfur element in anode area.The device structure is simple, and installation maintenance is simple, with economic feasibility.

Description

Technical Field

[0001] This invention relates to the field of environmental engineering wastewater treatment technology, specifically to a high-ammonia wastewater resource energy recovery system. Background Technology

[0002] Ammonia nitrogen, as the second most restricted pollutant after chemical oxygen demand (COD), is a key focus of water pollutant control in my country. High-concentration ammonia nitrogen emissions account for 85.9% of the total industrial ammonia nitrogen emissions nationwide, yet the treatment situation is far from satisfactory, with an ammonia nitrogen removal rate of less than 68%. Traditional technologies such as physicochemical and biological methods suffer from secondary pollution, high energy consumption, limited treatment capacity, and easy scaling inside equipment, and it is also difficult to recover ammonia resources from wastewater. Capturing the green energy contained in high-ammonia wastewater and regenerating and reusing water resources are important ways to achieve low-carbon emissions. Anaerobic digestion is an economical and effective key technology for the treatment and energy conversion of high-ammonia wastewater: nitrogenous substances such as proteins and urea are degraded into methane and small-molecule ammonia nitrogen by microorganisms. Methane is a recognized green energy source, but wastewater also contains another fuel that is rarely considered—ammonia. Ammonia contains 17.6% hydrogen (H) by relative mass. At high temperatures, it decomposes to produce a mixture of 75% H₂ and 25% N₂, which can be used as direct fuel for hydrogen-oxygen fuel cells. A bioelectrochemical system (BES) is a novel method based on electrochemical conversion processes, using microorganisms as catalysts to convert the chemical energy stored in degradable organic matter. As a novel wastewater treatment technology, BES works by utilizing electrochemically active microorganisms to transfer electrons released from electron donors to electrodes, which then transfer the electrons to electron acceptors via an external circuit, ultimately achieving system power generation. Summary of the Invention

[0003] The purpose of this invention is to provide a high-ammonia wastewater resource energy recovery system, which can recover ammonia, methane and elemental sulfur while removing C, N and S, and at the same time simplify the structure.

[0004] To achieve the above objectives, this invention provides a high-ammonia wastewater resource-energy recovery system, comprising an anaerobic reactor, an anode chamber, a cathode chamber, electrode plates, a cation exchange membrane, and an anion exchange membrane. The anaerobic reactor includes... The three-phase separator is located at the top, and an exhaust port is provided at the top. The cylinder is a cuboid structure with openings on both sides and the bottom. It has an outlet and a return port at the top, and sealing gasket grooves on both sides to connect the anode chamber and the cathode chamber, with an ion exchange membrane in between. The upper part of the cylinder has an arc-shaped structure, and the lower part has a sampling port. The water distribution plate is connected to the cylinder at the top and to the water distributor at the bottom. The water distributor has a water inlet hole and is a conical structure. It is connected to the water distribution plate at the top and has a water inlet at the bottom, which is connected to a peristaltic pump.

[0005] As a preferred embodiment, the anode chamber and cathode chamber are rectangular elements with single-sided openings. The opening side is provided with a sealing gasket groove, and the top is provided with a water inlet and an electrode wire outlet, and the bottom is provided with a drain outlet.

[0006] As a preferred embodiment, the electrode sheet is a rectangular element located on the inner wall of the anode chamber and cathode chamber, and connected to an external circuit, which includes a resistor, an electrochemical workstation, a data acquisition instrument, and a power supply.

[0007] As a preferred embodiment, the electrode sheet is made of platinum.

[0008] As a preferred embodiment, the three-phase separator is an inverted cone shape.

[0009] This invention targets the anaerobic treatment of high-ammonia wastewater, and separates the electrodes to avoid O2 interference. Under the action of electrode electrolysis, organic matter in the cathode region is converted into NH3, organic matter in the anaerobic region is converted into CH4, and sulfur in the anode region... 2- It is converted into elemental sulfur. This invention introduces electrochemical technology into the up-flow anaerobic sludge bed (UASB), and introduces bioelectrochemistry as a special metabolic pathway into the UASB system. This can regulate the establishment of microbial structure and electron transport pathways, and improve the overall resource and energy recovery efficiency and stability.

[0010] The beneficial effects of adopting the above technical solution are as follows: It achieves simultaneous removal of C, N, and S.

[0011] This avoids the inhibition of anaerobic methanogenesis by high ammonia, sulfides, and low pH.

[0012] By separating the electrode from the anaerobic process using an ion exchange membrane, interference from gases on the growth and metabolism of microorganisms in the anaerobic section is avoided.

[0013] Methane is purified at the alkaline cathode while ammonia is generated by stripping it off. Attached Figure Description

[0014] Figure 1 This is a schematic diagram illustrating the structural principle of an embodiment of the present invention.

[0015] These include: a three-phase separator 1, an anode chamber 2, electrode plates 3, anion exchange membrane 4, water distribution plate 5, water distributor 6, electrode plates 7, cathode chamber 8, cation exchange membrane 9, anaerobic section 10, DC power supply 11, submersible reflux pump 12, and peristaltic pump 13. Detailed Implementation

[0016] The embodiments of the technical solution of the present invention will now be described in detail with reference to the accompanying drawings. These embodiments are merely illustrative of the technical solution of the present invention and are therefore intended to limit the scope of protection of the present invention.

[0017] like Figure 1 As shown, this embodiment provides a high-ammonia wastewater resource-energy recovery system, including a peristaltic pump 13, a submersible reflux pump 12, a water supply pipe, an anode chamber 2, a cathode chamber 8, an anaerobic reactor, a cation exchange membrane 9, an anion exchange membrane 4, an electro-enhancing component, a rubber sealing gasket, and a rubber sealing pad, connected in sequence. The electro-enhancing component includes an electrode plate 3, a wire, a resistor, and a DC power supply 11. The anaerobic reactor includes, from top to bottom, a three-phase separator 1, an inlet, an exhaust port, an outlet, a reflux port, a water distribution plate 5, and a water distributor 6. The inlet is connected to the peristaltic pump 13, and the reflux port is connected to the submersible reflux pump 12. The water distribution plate has dense water distribution holes for better flow distribution. The water distributor 6 is located below the water distribution plate 5 and is used to provide water intake. It has an inlet at the bottom and is connected to the peristaltic pump 13. The anode chamber 2 and cathode chamber 8 are equipped with, from top to bottom, an inlet, a rubber gasket groove, an electrode wire inlet, and a drain outlet. A cation exchange membrane 9 and an anion exchange membrane 4 are placed between the anode chamber 2, the anaerobic reactor, and the cathode chamber 8, and sealed with rubber gaskets. Rubber gaskets are used to seal the bottom of the anaerobic reactor and between the water distribution plate 5 and the water distributor 6. Electrode plates 7 are located on the inner walls of the anode chamber 2 and cathode chamber 8 and are connected to the electrochemical workstation and data analyzer via wires.

[0018] In the reactor, the anode chamber 2 contains an HCl solution, the cathode chamber 8 contains a NaOH solution, and the anaerobic section 10 contains cultured activated sludge. High-ammonia wastewater enters the distributor 6 under the action of the peristaltic pump 13, and then flows into the distribution plate 5 for uniform distribution. The distribution plate 5 has densely packed distribution holes of at least 3 mm in diameter.

[0019] Electrode plates 3 and 7 in anode chamber 2 and cathode chamber 8 are connected to an external circuit powered by DC power supply 11. This external circuit can be connected to data analysis equipment such as data analyzers, electrochemical workstations, and computers to process parameters such as voltage and current. High-ammonia wastewater undergoes the following reaction after passing through activated sludge and electrolysis: anode: S 2- →S+2e - H2O→H + +O2 Anaerobic stage: Organic matter → CH4 + NH4 + cathode: H2O→H + +OH - NH4 + +OH - →NH3+H2O The generated methane, ammonia, hydrogen and other gases will be discharged from the three-phase separator 1 above the anaerobic section 10 and flow back to the bottom of the cathode chamber 8. Through the gas stripping action, the ammonia in the cathode chamber 8 will be carried away and finally enter the gas collection bag through the exhaust port.

[0020] The treated wastewater enters the three-phase separator 1 for solid-gas-liquid separation. The generated gas enters the gas collection bag through the central vent, while the effluent flows back into the influent for further treatment via the return port and the activated sludge is returned to the reactor. Finally, the treated effluent is discharged through the effluent outlet.

[0021] The above provides a detailed description of a high-ammonia wastewater resource-energy recovery system provided by the present invention. The specific embodiments described are merely for the purpose of helping to understand the method and core ideas of the present invention. It should be noted that those skilled in the art can make various improvements and modifications to the present invention without departing from its principles, and these improvements and modifications also fall within the protection scope of the claims of the present invention.

Claims

1. A method for energy recovery from high-ammonia wastewater, comprising a system including an anaerobic reactor, an anode chamber, a cathode chamber, electrode plates, a cation exchange membrane, and an anion exchange membrane, wherein... The anaerobic reactor includes, The three-phase separator is located at the top, and an exhaust port is provided at the top. The cylinder is a cuboid structure with openings on both sides and the bottom. It has an outlet and a return port at the top. The top of the cylinder has an exhaust hole, and the two sides have sealing gasket grooves that connect the anode chamber and the cathode chamber. A cation exchange membrane is installed between the opening on one side of the cylinder and the anode chamber, and an anion exchange membrane is installed between the opening on the other side of the cylinder and the cathode chamber. The upper part of the cylinder has an arc-shaped structure, and the lower part has a sampling port. The return port is connected to a submersible return pump. A water distribution plate is connected to a cylinder at the top and a water distributor at the bottom. The water distributor has a water inlet hole and is a conical structure. It is connected to the water distribution plate at the top and has a water inlet at the bottom, which is connected to a peristaltic pump. The method for energy recovery from high-ammonia wastewater is characterized by the following steps: 1) The anode chamber is filled with HCl solution and the cathode chamber is filled with NaOH solution. The anaerobic section of the anaerobic reactor is inoculated with cultured activated sludge. The high ammonia wastewater enters the water distributor under the action of the peristaltic pump and flows upward, and then enters the water distribution plate for uniform distribution. 2) The electrode plates in the anode and cathode chambers are connected to external circuits. Under the action of activated sludge and electrolysis, the high-ammonia wastewater undergoes the following reactions: organic matter in the cathode region is converted to NH3, organic matter in the anaerobic zone is converted to CH4, and sulfur in the anode region... 2- It is converted into elemental sulfur; anode: S 2- →S+2e - H2O→H + +O2 Anaerobic stage: Organic matter → CH4 + NH4 + cathode: H2O→H + +OH - NH4 + +OH - →NH3+H2O 3) The generated methane, ammonia and hydrogen are discharged from the three-phase separator above the anaerobic section and flow back to the bottom of the cathode chamber; 4) The treated wastewater enters the three-phase separator for solid-gas-liquid separation. The generated gas is discharged through the middle exhaust port, and the effluent is returned to the influent for further treatment through the return port under the action of the submersible return pump. The activated sludge that entered the anaerobic reactor is returned to the anaerobic reactor.

2. The method for energy recovery from high-ammonia wastewater according to claim 1, characterized in that: The anode chamber and cathode chamber are rectangular elements with single-sided openings. The opening side is provided with a sealing gasket groove, and the top is provided with a water inlet and an electrode wire outlet, and the bottom is provided with a drain outlet.

3. The method for resource-based energy recovery from high-ammonia wastewater according to claim 1, characterized in that: The electrode sheet is a rectangular element located on the inner wall of the anode chamber and cathode chamber, and connected to an external circuit, which includes a resistor, an electrochemical workstation, a data acquisition instrument, and a power supply.

4. The method for energy recovery from high-ammonia wastewater according to claim 1, characterized in that: The electrode sheet is made of platinum.

5. The method for energy recovery from high-ammonia wastewater according to claim 1, characterized in that: The three-phase separator is an inverted cone shape.

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