29results about How to "Improve denitrification effect" patented technology

The embodiment of the invention provides a corner tangential coal-fired boiler SCR denitration system and an ammonia injection grid partition control method thereof, and the method comprises the steps that an ammonia injection grid is divided into a plurality of independently-controlled large areas based on the combustion characteristics and flue gas flow characteristics of a coal-fired boiler, and each large area is internally provided with a plurality of ammonia injection grid injection points; a manual valve and an automatic adjusting valve are arranged in each large area, the ammonia spraying amount of a spraying point of a single ammonia spraying grid is adjusted through the manual valve, and the total ammonia spraying amount of the whole large area is dynamically adjusted through the automatic adjusting valve; and the NOx concentration and the ammonia escape concentration corresponding to each large area are monitored in real time, and the ammonia spraying amount of each large area is dynamically optimized through a control algorithm based on the boiler operation load change, so that the ammonia spraying distribution of each large area is matched with the NOx concentration distribution.

The application discloses a kind of salt-tolerant heterotrophic nitrification-aerobic denitrification composite microbial inoculant, which is compounded by seed liquid of halomonas sp LJK13, halomonas campaniensis LJK10 and halomonas alkaliphila LJK2, and the volume ratio of the seed liquid of halomonas sp LJK13, halomonas campaniensis LJK10 and halomonas alkaliphila LJK2 is 2-3:1-2:1-2.The composite microbial inoculant adapts to a wide range of environmental conditions, and when C / N is 20-200, salinity is 1%-30%, initial NH4 + -N and NO3 ‑ -N concentration is 50mg / L-1000mg / L, the denitrification removal rate of heterotrophic nitrification-aerobic denitrification composite bacteria is 28.0%-100%, which shows that the salt-tolerant heterotrophic nitrification-aerobic denitrification composite microbial inoculant has good comprehensive denitrification performance for seawater aquaculture wastewater, and has a wide range of environmental applications.

The application provides a method and device for treating wastewater by combining a suspended filler floating bed and a soil infiltration system, and the method comprises the following steps: S1, breeding wastewater is treated by the suspended filler floating bed after passing through a hydrolysis tank, and effluent is treated in a sedimentation tank, and wastewater of the suspended filler floating bed is returned to the suspended filler floating bed for secondary treatment; S2, wastewater of the sedimentation tank is returned to the hydrolysis tank; and S3, effluent of the sedimentation tank is introduced into a soil underground infiltration system. The system provided by the application is beneficial to further strengthening the effects of denitrification, phosphorus removal and removal of suspended solids, and solves the problems of low dissolved oxygen content of influent and wastewater in the system, which is not conducive to the growth of nitrifying bacteria, and low effective volume utilization rate. In the use process, the filler does not need to be replaced, and mechanical aeration equipment does not need to be added, and the system has the advantages of low investment cost, no need to add chemical agents for treatment, obvious effect, not easy to breed mosquitoes, simple operation and management, and beautification of the environment, and has remarkable ecological and economic benefits for promoting deep purification of breeding wastewater.

This utility model discloses a system for combined denitrification under full-load conditions in a circulating fluidized bed boiler, comprising a wide-temperature-range SNCR denitrification module and a flue gas circulation module. The injectors in the wide-temperature-range SNCR denitrification module are arranged in the inlet flue of the high-temperature separator, the inlet flue of the high-temperature superheater, or the boiler furnace. The flue gas circulation module includes a flue gas circulation header and flue gas circulation branch pipes arranged along the flue gas flow direction. The flue gas circulation header connects to the flue gas circulation branch pipes, which are connected to the air preheater via a primary air fan. The inlet of the flue gas circulation header connects to the outlet of the induced draft fan. This utility model extends the lower limit of the conventional 800~1050℃ temperature window to 650℃. It uses ethanol as a low-temperature additive, resulting in relatively low denitrification costs and convenient ethanol addition and removal. Compared with existing SCR denitrification technology, the system is simpler and more economical. It does not require boiler modification, nor does it require additional denitrification reactors and catalysts, making the system relatively simple and facilitating switching between low-temperature denitrification mode and conventional denitrification mode.

The utility model provides an energy-saving culture tail water nitrogen and phosphorus removal system. The energy-saving culture tail water nitrogen and phosphorus removal system comprises a rotary drum microfilter and autotrophic denitrification deep nitrogen and phosphorus removal equipment, an electro-catalysis module is arranged between the water outlet end of the rotary drum microfilter and the water inlet end of the autotrophic denitrification deep nitrogen and phosphorus removal equipment; the electrocatalysis module is configured to form phosphate precipitates in filtered water, the autotrophic denitrification deep nitrogen and phosphorus removal equipment is provided with a second water inlet pipe, the second water inlet pipe is connected with a mixing device, the other end of the mixing device is connected with a first water outlet pipe, and the first water outlet pipe is connected with a second water outlet pipe. The first water outlet pipe is connected to the autotrophic denitrification deep nitrogen and phosphorus removal equipment, and the mixing device is configured to be filled with sulfate reducing bacteria. Nitrogen, phosphorus and sulfur elements in culture tail water can be effectively removed, water area pollution is prevented, and the device has the advantages of being simple in structure, low in operation cost, high in treatment efficiency and the like; the method is suitable for treating various aquaculture wastewater.

The invention discloses a desulfurization ash-based denitrification nitrogen removal filter material as well as a preparation method and application thereof. The desulfurization ash-based denitrification nitrogen removal filter material is prepared from the following raw materials in parts by weight: 150 to 255 parts of elemental sulfur, 1 to 55 parts of calcium carbonate and 1 to 55 parts of desulfurization ash. The desulfurization ash-based denitrification nitrogen removal filter material can be used for nitrogen removal of nitrate nitrogen-containing wastewater, and the effect is excellent. According to the desulfurization ash-based denitrification nitrogen removal filter material, the sulfur electron donor material serves as a main active component, the main component in desulfurization ash is CaSO3, and + 4-valent sulfur contained in the desulfurization ash and 0-valent sulfur in sulfur have a synergistic effect, so that the oxidation reduction effect with NO3 <-> in water is effectively improved, and the denitrification effect is excellent; the industrial solid waste desulfurization ash and calcium carbonate are compounded to prepare the denitrification nitrogen removal filter material, so that the purposes of treating waste with waste, reducing cost and increasing efficiency are achieved, the dual purposes of high-value utilization of the industrial solid waste desulfurization ash and high-efficiency treatment of wastewater are achieved, and wide market prospects are achieved.

This invention relates to the field of wastewater treatment and discloses a device and method for the combined removal of heavy metals and antibiotics from wastewater. The device includes: a coagulation reaction zone, a pre-sedimentation tank, a high-efficiency sedimentation tank, an ozone distribution zone, an ozone oxidation tank, a primary anoxic tank, a primary aerobic tank, a secondary anoxic tank, a secondary aerobic tank, and a disinfection tank. The coagulation reaction zone is symmetrically and fixedly connected to one side of the pre-sedimentation tank, and the high-efficiency sedimentation tank is fixedly connected to the other side of the pre-sedimentation tank. This invention achieves rapid and efficient sedimentation of coagulated flocs through the combination of vertical and horizontal flow high-efficiency sedimentation tanks, removing heavy metals from wastewater in the form of precipitates. Furthermore, the advanced ozone oxidation process removes antibiotics, improves the biodegradability of the wastewater, and simultaneously disinfects the effluent, saving investment. In addition, the efficient solid-liquid separation of flat sheet membrane modules replaces the secondary sedimentation tank, effectively ensuring that the effluent is clear and meets standards.

This invention discloses a decentralized airlift reoxygenation circulating biological denitrification wastewater treatment device, employing an integrated inner and outer cylinder design, encompassing wastewater treatment, sludge-water separation, and discharge, with a complete process and reasonable structure. The area between the inner and outer cylinders forms a circular wastewater treatment zone with circulating flow, encompassing a two-stage AO biological denitrification process. It eliminates the need for nitrification liquor recirculation, exhibiting excellent denitrification effect, resistance to shock loads, and ease of management. The inner side of the inner cylinder serves as a sedimentation zone, with periodic manual or mobile sludge removal. An airlift device provides circulation power and pre-oxygenation; the circulating water volume is adjusted by regulating the air supply, thereby controlling the nitrification liquor recirculation ratio. The device consumes only one air pump, which supplies air to both the airlift device and the aeration device, resulting in low investment, low energy consumption, and easy management. Fixed supports and rope-type fiber packing are installed throughout the wastewater treatment zone, effectively preventing packing blockage and short-circuiting problems, and facilitating the timely discharge of detached biofilm.

This invention discloses a zoned permeable reactive barrier (PRB) for groundwater denitrification using a combination of zero-valent iron / slow-release carbon and zeolite, and its operating process. The PRB's structure comprises: (1) a quartz sand water distribution zone; (2) Fe... 0 / C-Denitrifying bacteria reaction zone; (3) Zeolite adsorption zone. This invention uses a mixture of biomass slow-release carbon and artificial slow-release carbon as a slow-release carbon source, and adds zero-valent iron to construct Fe 0 The / C system, using a mixed denitrifying bacteria agent for rapid start-up, and a zoned permeable reactive barrier (PRB) operation process for groundwater denitrification have been developed. This includes: filling processes based on different media permeability coefficients, reaction zone packing material compatibility based on different slow-release rates, and operating parameters based on different groundwater nitrogen pollutant concentrations. This invention improves the adaptability of the PRB process to hydrogeological conditions, accelerates the start-up of the denitrification process, ensures denitrification effectiveness during the start-up phase, improves denitrification efficiency during operation, and extends remediation time.

The sewage treatment method can greatly reduce the sludge amount, and comprises the following steps: step 1, flocculants and magnetic powders are added into sewage to be treated, after magnetic flocculation, precipitation and magnetic separation recovery, preliminary purified water is obtained; step 2, microbial mixed stock solution containing anaerobic ammonia oxidation bacteria and aerobic granular sludge carriers are added into the preliminary purified water, and aeration and non-aeration cultivation reactions are alternately carried out in a sequencing batch reactor, so that water degradation and purification are completed, wherein, protozoa are added on the 2nd-3rd day of the cultivation reaction, metazoan is added on the 4th-5th day of the cultivation reaction, and the reactor enters a stable operation period on the 6th-14th day of the cultivation reaction; and step 3, the water after the reaction is sequentially subjected to filtration and disinfection treatment, and reaches the water standard; by constructing a complete micro-animal food chain from functional bacteria to protozoa and metazoan, and by utilizing the predation of higher micro-animals on lower microorganisms, the sludge is in-situ reduced, and the environmental and economic benefits are achieved.

The utility model relates to a multi-stage ecological interception ditch for agricultural non-point source pollution prevention and control, which is suitable for agricultural non-point source pollution prevention and control. Comprising a ditch body, ecological protection slopes are arranged on the two sides of the ditch body, slope plants are arranged on the slopes of the ecological protection slopes, a plurality of interception dams are distributed in the ditch body in a staggered mode to form a snakelike overflowing channel, the upstream side of each interception dam is provided with a slag blocking net, the upper edge of each slag blocking net is higher than the water surface, and the area between every two adjacent interception dams is a purification area. By arranging multiple stages of interception units, the retention time of a water body is greatly prolonged, so that the sewage treatment and purification efficiency is further improved. Through multiple effects of physics and microorganisms, the filtering and conversion performance of the ecological interception ditch on nitrogen and phosphorus in water is improved, and then the purification effect of the ecological ditch is integrally improved.

This invention discloses an apparatus and method for achieving deep nitrogen removal and phosphorus recovery through dual short-range coupled anammox fermentation using in-situ sludge fermentation. First, calcium chloride solution is added to the anammox reactor at the rear end of a two-stage PNA process to form recoverable phosphorus crystals such as Ca-P precipitates. Anaerobic ammonia oxidizing bacteria attach to the surface of the precipitates, thereby enriching and retaining them within the anammox reactor. During the continuous formation of anaerobic ammonia oxidizing particles, unfermented waste activated sludge is added to the PNA process. The slow hydrolysis and acidification of the waste activated sludge provide a carbon source for the short-range denitrifying bacteria, completing the transformation from single-stage PNA autotrophic nitrogen removal to dual short-range coupled anammox synergistic nitrogen removal. In this invention, the anaerobic ammonia oxidizing bacteria in the granular sludge after operation can reach 12%, 73% of the sludge exhibits a particle size greater than 200 μm, and the total nitrogen removal rate remains above 90%, with most phosphorus existing in the recoverable form of Ca-P crystals.

The present application relates to sewage treatment technical field, disclose a kind of membrane aeration biological membrane reactor's operating method and operating device, sewage treatment system.The operating method has at least one control cycle during the continuous operation of reactor, the cycle includes: pre-control step, provide negative pressure pulse to membrane assembly inside, the normal compressive stress directed to membrane silk inside is applied to the biological membrane attached to the outer surface of membrane, so that the microstrain of outer layer structure is generated;Fluidized cutting step, add and fluidize circulating cutting microparticles to reactor, and microparticles are rolled cutting to the surface of biological membrane under the driving of fluid.By the cutting action of cutting microparticle and negative pressure pulse, the outer layer of biological membrane is selectively stripped from invalid biomass.The present application realizes the fine control from inside to outside to biological membrane under the condition of not interrupting sewage treatment process, can long-term maintain biological membrane in thin, high-activity ideal mass transfer state, effectively solve the problem that mass transfer efficiency attenuates with operating time.

The invention discloses a mesoporous silica coated nano zero-valent iron-manganese bimetallic composite material as well as a preparation method and application thereof, and belongs to the technical field of water pollution control. The preparation method comprises the following steps: (1) dissolving FeSO4. 7H2O in a solvent, adding a NaBH4 aqueous solution, and stirring; (2) adding an aqueous solution of MnSO4.H2O and NaBH4, and stirring again; (3) adding NH3.H2O and hexadecyl trimethyl ammonium bromide, stirring for the third time, adding tetraethyl orthosilicate and (3-mercaptopropyl) triethoxysilane, and stirring for the fourth time; and (4) centrifuging, washing, drying and grinding to obtain the product. The method overcomes the defect that nano zero-valent iron and manganese bimetal is easy to agglomerate and inactivate, has high oxidation resistance, stability and activity, large specific surface area, more active sites and good biocompatibility, and can be used as an inorganic electronic slow-release agent to enhance nitrogen removal by biological denitrification in a water body.

The invention provides a culture method and device of anaerobic ammonia oxidation sludge particles and application, and belongs to the technical field of anaerobic ammonia oxidation. Iron-rich activated carbon is used as a carrier, sludge is inoculated, and a nutrient solution is added for sludge granulation culture; the preparation method of the iron-rich activated carbon comprises the following steps: impregnating biochar with a potassium ferrate solution, and drying to obtain potassium ferrate modified biochar; calcining the potassium ferrate modified charcoal in an anaerobic environment to obtain iron-rich activated carbon; the sludge contains microbial flora of Bacteroidota, Planctomycin and Chloroflexi, and the microbial flora of Bacteroidota, Planctomycin and Chloroflexi is used as a raw material. According to the present invention, iron-rich active carbon is adopted as a carrier, AL-2 and c-di-GMP bi-component quorum sensing signal molecules secreted by flora and other EPS with high protein content ratio are adopted, and Chloroflexi filamentous structure and gliding movement ability are adopted to promote the copolymerization of the three bacteria, such that the granulation of the anaerobic ammonium oxidation bacteria important family member Planctomycin is promoted.

This invention addresses the problem in existing SCR denitrification devices where the catalyst distribution does not correspond to the flue gas distribution within the flue, affecting the overall catalytic effect. It provides a denitrification catalyst hybrid structure and a denitrification device. The hybrid structure includes a plate layer for supporting the catalyst. The plate layer comprises a honeycomb region and a flat plate region. The honeycomb region has a plurality of first airflow channels arranged in a regular polygonal pattern. The flat plate region has a plurality of second airflow channels arranged in a strip-shaped pattern, parallel to each other. The flat plate region is located at the edge of the plate layer, and the honeycomb region is located in the middle region. This allows flue gas in different regions to undergo sufficient catalytic denitrification reaction, improving the catalytic effect and extending the service life.

This invention discloses a segmented influent A / O process for deep denitrification of high-nitrogen organic wastewater. The segmented influent A / O process comprises n (≥3) A / O tanks operating in series. Based on wastewater treatment plant water quality monitoring data and experience, an appropriate amount of high-COD concentration water is introduced to increase the influent C / N ratio, with continuous influent at the beginning of each A tank. Low-C / N water is introduced into A1 tank, mixed water to increase C / N is introduced into tanks 2 to n-1, and only an appropriate amount of high-COD concentration water is introduced into tank n. During system operation, the A / O tanks are monitored. n The concentrations of nitrate nitrogen and COD in the mixed liquor at the end of the tank are used to monitor the nitrogen removal status of the system. When A is detected... n When the concentration of nitrate nitrogen or COD in the final mixed liquor of the pool is too high, adjust A in real time. n The high COD concentration water in the influent pool enables deep denitrification of high-nitrogen organic wastewater. This invention fully leverages the advantages of the segmented influent A / O process, improves effluent quality, simplifies operation and control conditions, and achieves the goals of upgrading standards, saving energy, and reducing consumption.

This invention relates to a vertical flow enhanced biological denitrification device and wastewater treatment method. A denitrification agent dosing component is added at a suitable location on the outside of the externally inclined guide section of an existing vertical flow reactor. This component allows for the addition of corresponding enhanced denitrification agents at selected points, further strengthening the denitrification reaction, improving the selectivity of the functional microbial reaction, consuming the nitrates produced by the anaerobic ammonium oxidation reaction, and providing sufficient substrate for anaerobic ammonium oxidation. This significantly promotes the anaerobic ammonium oxidation reaction and further improves the total nitrogen removal rate. By achieving precise control of the dosing location and accurate dosing based on the reaction, the invention achieves a synergistic effect of minimizing agent dosage and maximizing denitrification efficiency while enhancing the autotrophic biological denitrification efficiency, ultimately achieving the goal of green, low-carbon, economical, and efficient denitrification of wastewater.

The present application relates to sewage treatment technical field, more specifically, the present application relates to a kind of straw-based biofilm carrier and its preparation method and application.The present application provides a kind of straw-based biofilm carrier and its preparation method, and with crop straw as film-hanging carrier, construct algal-bacterial symbiotic system and be applied to aquaculture tail water treatment.Straw can be used as the carrier filler for the growth of microalgae and bacteria on the one hand, and can slowly release organic matter as carbon source for the growth of microorganisms attached thereto during degradation on the other hand.Microalgae photosynthesis can provide oxygen for aerobic bacteria, and the present application does not need aeration when treating aquaculture tail water, and the aged biofilm on straw is periodically peeled off by water flow impact and collected as fish bait, while treating aquaculture tail water, the organic matter and nitrogen, phosphorus and other nutrients therein can be recycled and utilized.

The present application relates to the technical field of flue gas purification, and discloses a high-temperature flue gas dust removal and denitration device, which comprises a flue gas inlet section, a dust removal and denitration reaction zone, an inertial collision dust removal zone, a clean flue gas chamber and a flue gas outlet section. The arrangement of the dust removal and denitration reaction zone, the inertial collision dust removal zone, the clean flue gas chamber and the flue gas outlet section meets the processing path of the flue gas entering from the flue gas inlet section, i.e. the flue gas enters the dust removal and denitration reaction zone from the flue gas inlet section, is subjected to primary treatment in the dust removal and denitration reaction zone, enters the inertial collision dust removal zone, is subjected to collision and dust removal in the inertial collision dust removal zone, is indirectly returned to the dust removal and denitration reaction zone, is subjected to secondary treatment in the dust removal and denitration reaction zone, enters the clean flue gas chamber, and is finally discharged from the clean flue gas chamber to the outside from the flue gas outlet section. The present application can make the flue gas treatment pass through three-stage dust removal and two-stage denitration by setting the flue gas processing path, and has the advantages of excellent dust removal and denitration effect and saving of production cost required by enterprises.

The utility model relates to the technical field of denitration, and provides a denitration reaction device which comprises a denitration tank, a denitration motor is arranged at the top of the denitration tank, a main breather pipe is arranged at the output end of the denitration motor, and the output end of the denitration motor penetrates through the top of the denitration tank and is connected to the main breather pipe. A plurality of groups of branch breather pipes are uniformly and symmetrically arranged on the side wall of the main breather pipe, fan blades are arranged below the branch breather pipes, spray pipes are uniformly arranged above the branch breather pipes, and the main breather pipe, the branch breather pipes and the spray pipes are all communicated; the rotation of the fan blades and the spraying of ammonia gas of the spraying pipe form a synergistic effect, so that the flue gas and the ammonia gas are fully mixed, the catalytic reaction is accelerated, the efficiency of the whole denitration process is improved, the purpose of efficient denitration is finally achieved, the denitration effect is optimized in the process, the denitration rate is also improved, and the service life of the denitration device is prolonged. Powerful guarantee is provided for industrial waste gas treatment.

The utility model discloses an efficient reaction device for nitrogen removal of a gaseous carbon source. The efficient reaction device comprises a reaction kettle, a base, a stirring mechanism, a temperature control assembly and monitoring equipment, two first hinge seats are respectively mounted on two sides of the outer wall of the reaction kettle; the top of the reaction kettle is provided with a detection port and a sample inlet, and the bottom is provided with a discharge port; a stratified sampling assembly is mounted on the side wall of the reaction kettle; four second hinge seats are mounted on the top surface of the base, and electric push rods are hinged between the first hinge seats and the second hinge seats; the stirring mechanism comprises an electric shaft assembly, a first stirring assembly and a second stirring assembly; and the electric shaft assembly is rotationally connected into the reaction kettle. According to the utility model, the angle of the reaction kettle can be flexibly adjusted, the stirring range is expanded, the stirring efficiency is improved, and the gas-liquid-sludge three-phase mass transfer efficiency is accelerated, so that the activated sludge reaction rate is improved, the sewage denitrification efficiency is accelerated, the treatment period is shortened, and efficient denitrification of a gaseous carbon source is realized.

The utility model discloses a kind of efficient multi-path denitrification device based on biological filler setting optimization, it is related to water treatment technical field, including shell, the lateral wall of shell is connected and is installed with water inlet pipe, five The partition plate separates the shell cavity of shell into anaerobic pool, primary anoxic pool, secondary anoxic pool, primary aerobic pool, secondary aerobic pool and sedimentation tank;In the utility model, by being provided with iron autotrophic denitrification filler porous suspended filler, due to its own structural characteristics, its dissolved oxygen concentration gradient not only exists in the formed biofilm, but also there is dissolved oxygen concentration gradient from the surface layer to the inner layer of filler, so that the nitrous acid bacteria and nitrate bacteria of inner layer are in low dissolved oxygen environment for a long time, a large amount of accumulation of nitrogen dioxide is realized by short path nitrification reaction, by the reasonable configuration of filler, it can effectively improve denitrification effect, ensure the normal operation of processing facility and stable discharge standard.

The application discloses a low-temperature denitration catalyst and a preparation method thereof, and belongs to the technical field of flue gas denitration catalysts. 60 The catalyst is prepared by doping fullerene C 60 The pi electron system of C 60 is highly delocalized on the three-dimensional curved surface thereof, so that C 60 has excellent electron transfer capacity; and the doping proportion of C 60 can effectively promote the rapid progress of the catalytic reaction. Therefore, the catalyst prepared by the application can be applied to low-temperature flue gas denitration, can significantly improve the denitration efficiency, can widen the active temperature range of the catalyst, and can solve the problems of poor low-temperature activity, insufficient sulfur resistance and easy poisoning of traditional catalysts.

According to the flue gas denitration and decarburization system, raw flue gas and hot air are directly mixed to increase the temperature of the raw flue gas, so that the flue gas denitration and decarburization system is not influenced by the temperature of the raw flue gas, the amount of the mixed hot air can be adjusted according to requirements, the flue gas temperature is ensured to reach the optimal denitration and decarburization range, and the adaptability of the whole system to the raw flue gas is improved; the desulfurization and denitrification efficiency is further ensured; meanwhile, the high-low temperature fluid mixer is arranged on the raw flue gas conveying pipeline and used for mixing the raw flue gas and the hot air, the uniformity of the mixed gas is improved, and therefore the uniformity and stability of the temperature of the mixed gas entering the denitration and decarbonization chamber are guaranteed, and the denitration and decarbonization effect is effectively improved.

The application discloses a method for relieving the inhibition of carbon dioxide on denitrification and promoting denitrification. The method comprises the following steps: inputting 0.3%-20% of CO2 into a closed reactor, inoculating Proteiniphilum aceticum into a denitrification system of P.denitrificans, and realizing the effect of relieving the inhibition of CO2 on denitrification and promoting the denitrification efficiency through the interaction of the two bacteria, wherein the inoculation ratio of P.denitrificans and Proteiniphilum is 1:2-1:15, the carbon-nitrogen ratio of the denitrification system is 1-5, the pH of the denitrification system is 6.0-9.0, and the temperature of the denitrification culture is 30-37 DEG C. The application promotes anaerobic denitrification by using the interaction of Proteiniphilum and P.denitrificans, has low cost, has no secondary pollution, can obviously relieve the inhibition of CO2, improves the nitrate removal effect, and reduces the accumulation of nitrite and nitrous oxide.

A nitrogen-adsorption gel material, its preparation, and its application are disclosed. The nitrogen-adsorption gel material comprises a porous network structure cross-linked with polyvinyl alcohol and phytic acid, and the porous network structure is loaded with zeolite particles. The preparation method involves adding zeolite to a copolymer solution of polyvinyl alcohol and phytic acid under alkaline conditions, and then adding a cross-linking agent to the resulting polyvinyl alcohol-phytic acid-zeolite mixture for cross-linking and curing. The cross-linked and cured mixture is subjected to liquid-solid separation, and the solids after liquid-solid separation are washed until the pH is neutral. The nitrogen-adsorption gel material is used to reduce the ammonia nitrogen content in water bodies through adsorption, or added to a bioreactor to couple a biological reaction for deep denitrification. The material of this invention has good sphericity and excellent ammonia nitrogen adsorption performance.

The utility model belongs to the technical field of sewage treatment, and particularly provides an arc-shaped water inlet weir of a denitrification filter tank, which comprises a weir body and a weir plate, the weir plate is fixed on the weir body, the weir plate is an arc-shaped plate, the upper end of the weir plate is tangent to the water inlet flow direction of an upstream water body, and the lower end of the weir plate extends below the water surface of a downstream water body; and the perforation rate of the weir plate is gradually increased along the water flow direction. The water inlet weir structure can effectively reduce water drop reoxygenation, reduce the adding amount of a carbon source, realize uniform water distribution and improve the denitrification efficiency.