107results about How to "To achieve the purpose of denitrification" patented technology

The invention discloses a method and a device for treating garbage percolate, wherein the method comprises the steps of pretreatment, anaerobic treatment, membrane biochemical treatment, nanofiltration treatment, sludge treatment and the like; the device comprises a primary sedimentation tank (1) and an adjusting tank (2), the adjusting tank (2) is connected with an anaerobic reactor (3), the anaerobic reactor (3) is connected with a denitrification tank (4), and the denitrification tank (4) is communicated with a nitrification tank (5); and the nitrification tank (5) is connected with an ultrafiltration apparatus (6), and the ultrafiltration apparatus (6) is connected with a nanofiltration device (7). The method and the device achieve COD degradation of high-concentration wastewater so that the COD of high-concentration COD of 50,000 reaches about 50 after treatment and reaches the standard of industrial reuse water, thus the method and the device achieve zero discharge of the percolate, initiate a new attempt to treat high-concentration percolate, and fill up the domestic blank.

The invention discloses a preparation method of a rare-earth-based composite multi-component denitrification and dioxin removal catalyst. According to the preparation method, titanium dioxide (titanium white) and silicon powder as carriers and ammonium metatungstate, ammonium metavanadate, cerous nitrate and lanthanum nitrate as active components, the steps of mixing, kneading, molding, drying and roasting are carried out in the presence of auxiliary materials to prepare the catalyst, wherein the auxiliary materials include monoethanolamine, citric acid, ammonium hydroxide, lactic acid, stearic acid, glass fibers, macromolecular polymer fibers RP-CHOP, hydroxypropyl methyl cellulose, polyoxyethylene and water. The prepared catalyst can simultaneously decompose nitric oxides and dioxin and can improve the mercury removal efficiency of the existing smoke control device. The prepared catalyst is not only applicable to new power plants, but also suitable for the modification of a wet-method desulphurization device of an old power plant, 80 to 95 percent of HgO generated in a coal burning power plant can be oxidized to Hg<2+> by utilizing the prepared catalyst, and a majority of particle-state Hg<2+> can be removed by utilizing a dust removal device.

The invention discloses a method of intensified denitrification and dephosphorization of urban sewage, which relates to a method of denitrification and dephosphorization of urban sewage. The method solves the problem of poor denitrification and dephosphorization effect and high cost existing in the existing AO technique for treating urban sewage. The method comprises the steps: a. partial sludge in a secondary sedimentation tank enters into a primary sedimentation tank after ultrasonication and ozone treatment with urban sewage for hydrolyzation and acidification; b. sewage treatment in an anaerobic zone is conducted; c. sewage treatment in an anoxic zone is conducted; d. partial mixed liquid of sludge and sewage in the anoxic zone enters a water distribution sedimentation tank; e. supernatant in the water distribution sedimentation tank enters a chemical reaction sedimentation tank; f. the mixed liquid of sludge and sewage in the Step e and the mixed liquid of sludge and sewage left in the Step d enter an oxic zone; and g. the mixed liquid of sludge and sewage in the oxic zone enters the secondary sedimentation tank, and effluent obtained from the supernatant in the secondary sedimentation tank is the urban sewage after denitrification and dephosphorization. The method has good denitrification and dephosphorization effect and low cost.

The invention discloses a salinivibrio strain which can carry out biological denitrification under high-saline conditions, and an application thereof. The salinivibrio strain provided by the invention is collected in China General Microbiological Culture Collection Center (CGMCC) on 29th March, 2012 with a collection number of CGMCC No.5946. With a salinity (calculated according to NaCl) below 3-10%, the strain is placed in nitrogen-containing wastewater with dissolved oxygen of 2-6mg/L, such that biological denitrification can be carried out. The strain has high tolerance to high salinity, and grows well in a high-saline condition. The strain has both heterotrophic nitrification and aerobic denitrification capacities. Under a high-saline aerobic condition, the strain can carry out synchronous nitrification and denitrification, such that total nitrogen in sewage can be completely removed with high efficiency. Therefore, a major problem of biological denitrification under high-saline conditions is effectively solved, and a good application prospect is provided.

The invention discloses a combined process for building partial nitrosation-anaerobic ammonium oxidation garbage percolate. The method comprises the following steps of: normally separating and removing, filtering and settling garbage percolate, anaerobically and biochemicalally pre-processing; putting the pre-processed garbage percolate in a started and steady SBR (Sequencing Batch Reactor) reactor; controlling the temperature of the SBR reactor in a range of 25-35 DEG C; hydraulically staying for 2 to 3 days, wherein the dissolved oxygen concentration is 2 to 3 mg/L so that the mol concentration ratio of nitrosation nitrogen to ammonia nitrogen in the water is 0.8 to 1.4; flowing the water into an anaerobic reactor and carrying out the anaerobic ammonium oxidation to denitrify. The method provided by the invention controls the reaction condition of SBR reactor so that the ammonia nitrogen in the garbage percolate is partially nitrosated and then removed in the garbage percolate in the series anaerobe reactor. Compared with the traditional garbage percolate denitrifying process including nitration and denitrification, the method obviously reduces the addition of agents and the consumption of the power energy, reduces the processing cost of garbage percolate and is an energy-saving, consumption-emission and environmental-friendly processing process.

The invention discloses a treatment method of secondary wastewater of kitchen waste. The treatment method comprises the following steps of: (1) carrying out materialization pretreatment on kitchen wastewater to remove floater, animal or vegetable butter, oil and SS (suspended matter) in the wastewater; (2) carrying out the two-stage hydrolysis acidification-IC (internal circulation) anaerobic reaction treatment and biochemical treatment of an aerobiont separation bed on the wastewater; and (3) carrying out flocculation and precipitation on the biochemically-treated wastewater to discharge, and concentrating, dewatering and drying precipitate. The wastewater discharged by using the method reaches The people's Republic of China national standard of sewage comprehensive discharge standard (third-level discharge standard); through two-stage hydrolysis acidification-IC anaerobic reaction treatment, the gross removing rate of CODcr (chemical oxygen demand) can reach more than 92%, and carbon source does not needed to be supplied in the midway of the reaction, so that the normal running of equipment can be guaranteed.

The invention discloses a treatment method for a preposed municipal sewage denitrification biological filter, relates to a water treatment method, and solves the problems that the prior water treatment method has long process, poor treatment effect, large occupied area and high sewage treatment cost. The method comprises the following steps: firstly, pretreatment of municipal sewage; secondly, feeding outlet water after pretreatment and nitrified backflow liquid into a denitrification filter pool together to carry out denitrification treatment; thirdly, back feeding iron trichloride solution to carry out chemical phosphorus removal; fourthly, feeding the outlet water after denitrification into an aeration biological filter to carry out nitration treatment; and fifthly, sterilizing by ultraviolet, namely, realizing the treatment of the sewage. The method has simple process, shortens process flow, and has little occupied area, good water treatment effect and stable outlet water quality under the conditions of lower energy consumption and capital expenditure; and the water quality reaches the requirement of grade A standard of Municipal Wastewater Treatment Plant Discharge Standard prescribed by China.

Relating to sewage treatment devices and sewage treatment methods, the invention provides an integrated sewage treatment device of a membrane bioreactor and a sewage treatment method. The invention aims to solve the problems of large land occupation area, high operation cost, complex operation management, unstable effluent quality and the like in existing sewage treatment technologies and devices. In the invention, a three-phase separator component is arranged inside a membrane bioreactor, and by means of bottom aeration and the separation effect of the separator, an integrated device with ananoxic upper part and an aerobic lower part can be formed. Sewage enters from the upper anoxic area of the reactor, and then enters the lower aerobic area through a slit of the three-phase separator.Meanwhile, a mixed solution backflow device is disposed to return a mixed solution in the aerobic area to the anoxic area, thus finishing nitrogen removal treatment of the sewage. The sewage treatment device and method provided in the invention can realize synchronous nitrogen removal and decarbonization, and have the advantages of small land occupation area, saving of sewage treatment required alkalinity and engineering cost, as well as simple operation management. And the sewage treatment device and method of the invention can be applied in treatment of urban sewage or nitrogen-containing industrial wastewater.

A process for denitrifying and dephosphorizing sewage features use of biological treating method in such manner that the anoxic condition, anaerobic condition and aerobic condition are sequentially arranged. Its advantages are no conflict in carbon source and sludge age, and high effect.

The invention relates to a waste water treatment system, especially to a microbial fuel cell wastewater treatment system for improving a nitrogen removal effect. The invention aims to develop the waste water treatment system which is low in energy consumption, high-efficient and stable, and thus further improve the nitrogen removal effect of the microbial fuel cell wastewater treatment system. The invention is characterized in that the dual-chamber microbial fuel cell wastewater treatment system is composed of an anode and a cathode, wherein the anode is without any modification, a cathode camber of the microbial fuel cell is inoculated with nitrated sludge and added and embedded with aerobic denitrifying bacteria particles, so as to play effects of nitrification and denitrification in one reaction zone synergistically, fully utilize DO and residual carbon sources of the cathode, and realize purposes of denitrification and further COD removal. The microbial fuel cell wastewater treatment system provided by the invention shows good COD removal effects, high ammonia nitrogen and total nitrogen removal rate, and continuous and stable voltage output, and is free of waste sludge.

The invention discloses a sewage treatment system for river ways in a city. The system comprises a sewage pond, a stop net for filtering away suspension and chemical matter in sewage, an adjusting pond, a concrete pond, a settling pond, an anaerobic pond, an aerobic pond, an anoxia pond and a filter device. Microbial flora is added into the anaerobic pond. Nitrosomas and nitromonas are added into the aerobic pond. Denitrification bacteria are added into the anoxia pond. A filter layer, an adsorption layer, a filler layer and a heavy metal absorption layer are sequentially arranged in the filter device from bottom to top. The top of the filter device is connected with a micro-ecological filter pond through a drain pipe. By means of the sewage treatment system and a technology for river ways in the city, water body conditions are analyzed, and ecological regulation and control are achieved; by means of the method of combining exogenous pollution control, endogenous pollution control and micro-ecological system repair, the pollution problem of river ways in the city can be effectively solved, and a good pollution treatment effect is achieved. The invention further discloses the sewage treatment technology for river ways in the city.

The invention relates to a ceramic catalytic filter element for flue gas purification and a flue gas desulfurization and denitrification integrated dust removal method. The ceramic catalytic filter element is prepared from the following steps that a microporous alumina ceramic filter tube with a pore diameter of 40-80 microns is taken as a matrix; the matrix is immersed in a mixed sol made of zincacetate, and after the matrix is impregnated under a negative pressure, the matrix is roasted to obtain a modified matrix modified by zinc oxide; an equal volume impregnation method is adopted, and the modified matrix is impregnated with an mixed oxalic acid solution containing ammonium metavanadate and ammonium metatungstate, so that total loading mass of V2O5 and WO3 in pores of the matrix reaches 4.0%-6.0% to obtain an active matrix; the active matrix is immersed in a mixed sol made of Al2O3-SiO2-TiO2, the active matrix is dried and roasted after the active matrix is taken out, and a densefilm with a thickness of 0.2-0.6 millimeter and a pore diameter of 1-10 microns is formed on the outer surface of the active matrix to obtain the ceramic catalytic filter element. A denitrification catalyst of the ceramic catalytic filter element has the advantages of being strong in load, high in denitrification efficiency, long in service life and applicable to popularizing and using.

The present invention discloses an integrated IODS reactor. According to the integrated IODS reactor, an anoxic zone, an aerobic zone and a precipitation zone form a parallel three-gallery form arranged on one end of the reactor, a pre-denitration and selection zone and an anaerobic zone are arranged on the other end of the reactor, and all function zones are cleverly and compactly arranged inside an integrated structure. According to the present invention, sewage enters the reactor by using a segmented entering manner, one part of the sewage and reflux sludge enter the pre-denitration and selection zone so as to be subjected to a complete contact reaction, and then enter the anaerobic zone, the other part of the sewage directly enters the anaerobic zone, the anaerobic zone sewage enters the starting end of the anoxic zone through the through hole wall, a first circulation (denitrogenation circulation) is formed between the anoxic zone and the aerobic zone through the circulation power provided by an air plug flow zone, a second circulation (precipitation circulation) is formed between the aerobic zone and the precipitation zone through the circulation power provided by the air plug flow zone, and the treated effluent is discharged out of the reactor from the precipitation zone.

The invention discloses a kitchen waste percolate enhanced treatment method. The kitchen waste percolate enhanced treatment method comprises the following steps: (1) enabling kitchen waste percolate wastewater to sequentially enter a grid, an oil separation pool and a preaeration regulating pool; (2) lifting the wastewater to a demulsification pool; (3) enabling the wastewater to enter air floatation equipment; (4) enabling effluent to enter a primary settling pool; (5) enabling the wastewater to flow automatically into an anaerobic ammonia oxidation reaction pool; (6) lifting the wastewater to a forced hydrolysis pool; (7) enabling the effluent to flow automatically into an ABFT pool; (8) enabling the effluent to enter an MBR membrane bioreactor; and (9) enabling the produced water to enter a clean water pool. The invention also discloses a kitchen waste percolate enhanced treatment system. The kitchen waste percolate enhanced treatment system comprises a pretreatment unit, the preaeration regulating pool, the demulsification pool, the air floatation equipment, the primary settling pool, the anaerobic ammonia oxidation reaction pool, the forced hydrolysis pool, the ABFT pool, theMBR membrane bioreactor and the clean water pool. The technology is advanced, the process is reliable and the effluent is stable and reaches the standard.

The invention relates to the field of purification devices, and provides a vibration reduction type diesel engine tail gas purification device. The purification device comprises an exhaust pipe, a shell body, a first vibration reduction system and a second vibration reduction system, wherein the shell body, the first vibration reduction system and the second vibration reduction system are arrangedin the inner periphery of the exhaust pipe in an embedded manner; a flange is arranged at one side end of the shell body, a fixed plate is fixedly connected to the upper end of the flange, and the fixed plate and the exhaust pipe are fixedly connected through a bolt; an air purification chamber is further arranged inside the shell body, and a dust removal pipe, a filter screen and an activated carbon plate are arranged in the air purification chamber; and the invention further provides a using method of the vibration reduction type diesel engine tail gas purification device. According to thedevice, the activated carbon plate and the filter screen are installed on a mounting plate, moreover, the first vibration reduction system and the second vibration reduction system cooperate so that the activated carbon plate and the filter screen can move up and down, and an air purification device can be prevented from being damaged due to vibration in the running process of the diesel engine; and meanwhile, a detachable and easy separating structure of a connecting mode between the shell body and the exhaust pipe is designed, so that later clearing of the dust removal pipe, the filter screen and the activated carbon plate is more convenient.

The invention belongs to the sewage treatment field, and especially relates to a household integrated device for rural domestic sewage treatment, and a method thereof. Separator plates divide the internal of the cylindrical domestic sewage treatment device into a plurality of aerobic areas and an anaerobic area, and the upper part or the lower part of every separator plate is perforated to make sewage move in a baffling manner in the treatment process from water feeding to water discharging in order to increase the volume utilization rate; and the outer ring aerobic areas and the anaerobic area are respectively filled with a filler, aeration tubes are arranged in the anaerobic areas, and the device can efficiently remove carbon and nitrogen and realize sludge reduction under an anaerobic-aerobic environment repeated alternation condition. The device and the method have a high sewage treatment efficiency, the device has the advantages of simple structure, small size and low energy consumption, and can run for a long term without professional management, and the device and the method are especially suitable for village single-house domestic sewage treatment.

The invention provides an iron cycle drive based device and method for an ammonia nitrogen anaerobic in-situ treatment. The method is characterized in that nitrate is added into an iron containing Feammox system to trigger nitrate dependent ferric oxidation (NDFO), and the generated Fe(III) participates in Feammox to remove nitrogen. The method comprises following steps: step one, mixing seed sludge containing Feammox microbes with a nutrient solution to obtain a sludge-water mixture; step two, adding the sludge-water mixture into an anaerobic reactor, exposing the mixture to nitrogen gas (N2)until the DO (dissolved oxygen) of the sludge-water mixture reaches 0.02 mg/L or less, after five days, discharging the supernate, adding new equivalent nutrient solution, and performing the cycle for 5 to 7 times; and step three, adding nitrogen containing wastewater or a mixture of nitrogen containing solids and water, exposing the mixture to nitrogen gas (N2) until the DO (dissolved oxygen) ofthe sludge-water mixture reaches 0.02 mg/L or less, periodically adding a nitrate solution, starting stirring, wherein the operation temperature of the reactor is 25 to 35 DEG C, and the pH is controlled in a range of 5.0 to 6.0, and running the system for 90 to 100 days.

The invention relates to a low-energy and intelligent three-dimensional ecological self-refluxing circulation nitrification method and apparatus. Wind driven generators are disposed aside of an anaerobic tank; and a solar power installation is disposed on a roof above the anaerobic tank. The tank is provided with at least one three-dimensional ecological self-refluxing circulation nitrification processing unit; each unit is divided into an ecological deodorization zone and a circulation nitrification reaction zone from top to bottom; each reaction zone is divided into an aerobic zone, a facultative zone, a sedimentation zone and an anaerobic zone from inside to outside, wherein the aerobic zones are provided with aeration components. The sewage flows through the anaerobic zone to the aerobic zone and enters the facultative zone for reaction and primary sedimentation after reacting in the aerobic zone through an aeration effect; partial of the sewage mixed liquid is aerated and enters the aerobic zone again; the other partial of the sewage self-refluxes to the anaerobic tank through a sludge diversion pipe; and a supernatant in the sedimentation zone finally flows out from a collecting pipe. The aeration power and gas-water density difference allows the sewage realizing self-refluxing circulation nitrification among every zone, so that pollutants can be effectively removed and the sewage can meet discharge indexes such as deodorization, nitrogen and phosphorus removal and total nitrogen in upgrading and reconstruction of municipal sewage plants.

The invention relates to a transition metal phosphide hydrogenation catalyst and a preparation method thereof. An inorganic porous material is used as a carrier for loading active components and a metal cocatalyst; the active components comprise tungsten, nickel and phosphorus, the total weight of tungsten and nickel oxides is 1-60% of that of the catalyst, the molar ratio of the tungsten and nickel material is 1:10-10:1, and total molar ratio of the total amount of tungsten and nickel to phosphorus is 1:4-6:1; the metal catalyst is selected from the group consisting of cerium and / or titanium element; the content of the amorphous silicon aluminum material in the inorganic porous material is 3-75 wt.% of the carrier; the content of macroporous alumina is 10-80 wt.% of the carrier; the content of a mesoporous molecular sieve is 0-50 wt.% of the carrier; the content of a binder is 1-15 wt.% of the carrier; and the content of metal cocatalyst is 0.1-30 wt.% of the catalyst. The catalyst can effectively remove the sulfur-containing compounds and nitrogen-containing compounds in petroleum fractions, so as to reach the purpose of depth desulfurization and denitrification.

The invention discloses a method for treating middle and late stage landfill leachate by a continuous flow short-cut nitrification/endogenous short-cut denitrification/anaerobic ammonia oxidation integrated process, and belongs to the field of biological treatment of high-ammonia nitrogen sewage. Middle-late stage landfill leachate enters an AOA continuous flow reactor to operate in an A/O/A (anaerobic/aerobic/anoxic) mode, and total nitrogen removal is achieved through a PN/A-ED/A (short-cut nitrification/anaerobic ammonia oxidation-endogenous short-cut denitrification/anaerobic ammonia oxidation) combined process. Microorganisms in the anaerobic section absorb an external carbon source in inlet water and store the external carbon source as an intracellular carbon source, short-cut nitrification is carried out in the aerobic section, and ammonia nitrogen in the inlet water is partially oxidized into nitrite nitrogen; and in the anoxic section, anaerobic ammonia oxidation is firstly carried out to generate part of nitrate nitrogen, the nitrate nitrogen is reduced into nitrite nitrogen through endogenous short-cut denitrification, and the nitrite nitrogen is provided for anaerobic ammonia oxidation reaction; 95.3% of total nitrogen in the middle and late stage landfill leachate is removed through the continuous flow reactor, and the continuous flow reactor is suitable for deep denitrification treatment of high-ammonia-nitrogen wastewater such as the landfill leachate.

The invention discloses a dust adhesion-resistant coated denitration catalytic sphere and a preparation method thereof, and belongs to the technical field of denitration catalysis. The catalytic sphere has a core-shell structure, the shell is polytetrafluoroethylene and is provided with uniform through holes, and a MnO2-X-CeO2-based denitration catalyst with an active carbon carrier is used as a filler. The preparation method comprises the following steps of: preparing hemispheres of the polytetrafluoroethylene shell; drilling holes on the hemispheres; and filling the MnO2-X-CeO2-based denitration catalyst with the active carbon carrier in the hemispheres and forming a whole sphere by using a hot-pressing welding method to obtain the coated denitration catalytic sphere. The dust is prevented from being adhered to the catalyst, so that the catalyst achieves effect for a longer time in a greater degree.

The invention discloses a sewage treatment system, and relates to the technical field of sewage treatment. The system mainly includes a sewage pool, a coarse grid, a grit chamber, a primary sedimentation tank, an adjustment tank, a flocculation tank, a secondary sedimentation tank, an anaerobic tank, an aerobic tank, an anoxic tank, a filtering device and an ecological filter tank, a flocculatingagent is added into the flocculation tank, and the flocculating agent comprises, by weight, 20-45 parts of lignin, 3-7 parts of trioxymethylene, 12-18 parts of triethylenetetramine, 2.5-3 parts of sodium hydroxymethanesulfonate, 6-9 parts of isobutanol, 11-17 parts of 2,3-epoxypropyltrimethylammonium chloride, 5-8 parts of aluminum sulfate, 2.5-3.8 parts of ferrous sulfate, 6-9 parts of zinc chloride and 16-20 parts of polyacrylamide. The system solves the problems of long acting time and poor removal effect of the flocculating agent, and reaches the advantages of fast action and good removaleffect of the flocculating agent.

The invention discloses a comprehensive treatment method and apparatus for exhaust gas pollutants of a marine diesel engine. The apparatus comprises a venturi washing device, a hypergravity reactor, awaste liquid cabinet, an oxidant aerosol generating device, an aerosol reaction zone, an electrostatic defogging device, an air compressor and a waste gas storage tank. The method and device make thegas-liquid contact more fully, and significantly increase the reaction rate. The reaction consumes less medicament, the fresh water consumption of a ship and the amount of medicines carried on the ship are reduced. The size of the hypergravity reactor is small, and the occupied space of a cabin of the ship is greatly reduced. The waste gas storage tank is connected to a scavenging system of the marine diesel engine, and the amount of nitrogen oxides of the diesel engine is directly reduced by a way of exhaust gas recirculation. The exhaust gas in the waste gas storage tank can also be used asinert gas of the ship.

The invention discloses a gas boiler system, which comprises a furnace body, a catalytic reactor, a smoke exhaust pipeline, a smoke residual heat utilizing device and a smoke re-cooling device, wherein a smoke exhaust opening is formed in the furnace body; the catalytic reactor is arranged in the furnace body and is used for promoting NO in the smoke to be oxidized to NO2 before the smoke is exhausted from the smoke exhaust opening; the smoke exhaust pipeline is arranged outside the furnace body, is connected with the smoke exhaust opening of the furnace body and is used for receiving exhausted smoke and exhausting the smoke to the atmosphere; the smoke residual heat utilizing device is arranged in the smoke exhaust pipeline and is used for receiving the smoke exhausted from the furnace body, so that the smoke exchanges heat with a first medium to heat the first medium and cool the smoke to separate out condensate water; the smoke re-cooling device is arranged at the downstream of the smoke residual heat utilizing device and is used for further cooling the smoke exhausted from the smoke residual heat utilizing device; while working, the condensate water is used for absorbing NO2 in the smoke. According to the gas boiler system, at the time that the emission of nitrogen oxide is greatly reduced, deep recycling of residual heat of smoke condensing is realized.

The invention belongs to the technical field of microbial fuel cells and water treatment, and provides a microbial fuel cell and a method for promoting wastewater denitrification thereof. The cell comprises an anode chamber, a cathode chamber and a carbon dioxide ventilation device. A sealing cover is arranged on the anode chamber for sealing, and anode sludge anaerobic digestion liquid flows backto the cathode chamber through a peristaltic pump; the anode chamber and the cathode chamber are separated by a proton exchange membrane in a communicating side pipe, the cathode and the anode are connected through a wire, and an external resistor is arranged on the wire; and carbon dioxide is introduced into the cathode through a microporous aeration disc at the bottom of the cathode chamber toserve as a carbon source of the cathode. According to the invention, sludge in the anode chamber of the microbial fuel cell can generate VFA, water and other substances in an anaerobic state, and thereturned anode sludge anaerobic digestion liquid and introduced carbon dioxide are used as a cathode carbon source at the same time, so the sludge of the anode can be reduced, the pH of the cathode can be adjusted, the denitrification efficiency of the cathode can be improved, and the performance of the microbial fuel cell for treating nitrogen-containing wastewater can be improved.