61results about How to "Improve denitrification effect" patented technology

The invention discloses a sulfur-manganese composite autotrophic denitrification filler as well as a preparation method and application thereof, and belongs to the technical field of environmental functional materials and polluted water treatment. The sulfur-manganese composite autotrophic denitrification filler contains manganese salt, a sulfur-based component and a cement-based component, the manganese salt comprises one or more of manganese carbonate, calcium manganese ore and rhodochrosite; the sulfur-based component comprises sulfur and sulfur manganese ore; the cement-based component comprises cement, fly ash pottery sand, silica fume, blast furnace slag and metakaolin; the cement comprises one or more of Portland cement, iron aluminate cement and sulphoaluminate cement. The nitrogen removal efficiency of the sulfur-manganese composite autotrophic denitrification filler is superior to that of a sulfur autotrophic denitrification system, the sulfate concentration and nitrite nitrogen accumulation in effluent are remarkably reduced, the service life of the filler is prolonged, and the efficient utilization rate of the material is improved.

The invention relates to the technical field of water treatment, in particular to a denitrification slow-release composite carbon source as well as a preparation method and application thereof. Comprising the following components in percentage by weight: 2-10% of hydroxy acrylic acid, 2-10% of saccharides, 5-15% of straw waste liquid, 5-15% of kitchen waste liquid, 2-10% of saccharides, 3-15% of porous volcanic ash, 5-15% of polyvinyl alcohol, 0.2-1% of inorganic salt, 1-2% of polypeptide, 0.5-1% of growth factors, 0.2-1.5% of MFC agar, 0.1-0.5% of cellulase, 0.1-0.5% of protease, 0.1-0.5% of denitrifying bacteria and the balance of water. The sum of the percentages of the raw materials is 100%. The invention has the advantages that: each nutrient component is balanced, the nutrition is comprehensive, the activity of denitrifying bacteria is improved, the number of species and community layers of a biological system of a sewage treatment plant are increased, the growth of various microorganisms is facilitated, nutrient substances can be fully utilized, and the denitrification effect is far higher than that of related carbon sources such as single methanol, glucose and the like.

The invention belongs to the technical field of sewage treatment, and discloses an anaerobic ammonia oxidation enhanced denitrification device and method based on an electron mediator type biological carrier and iron oxide. The anaerobic ammonia oxidation enhanced denitrification device comprises a reactor main body, a heat preservation circulating water device, a stirring device, a water inlet pipeline and a water outlet pipeline, anaerobic ammonium oxidation bacteria are contained in the reactor main body, a certain proportion of electron mediator type biological carriers are filled in the reactor, and a proper amount of iron oxide is added; wherein the added high-valence iron oxide can be used as an extracellular electron acceptor of anaerobic ammonium oxidation bacteria, the electron mediator type carrier can be used as a redox mediator, and nitrogen removal of the anaerobic ammonium oxidation system is promoted by strengthening the extracellular electron transfer process of the anaerobic ammonium oxidation bacteria.

The invention relates to the technical field of sewage treatment, in particular to a method and device for purifying printing and dyeing wastewater based on TAPB-DMTA COF Fenton-like synergistic bacteria and algae. According to the specific technical scheme, the printing and dyeing wastewater purification method comprises the following steps that 1, printing and dyeing wastewater is introduced into a photocatalytic Fenton-like reactor, porosity-modified photocatalysts TAPB-DMTA COF and H2O2 are added into the photocatalytic Fenton-like reactor, a baffle plate is arranged in the photocatalytic Fenton-like reactor, the angle of the baffle plate is 30-45 degrees, and the angle of the baffle plate is 30-45 degrees; a first illumination module is arranged outside the photocatalytic Fenton-like reactor; and (2) introducing the wastewater treated in the step (1) into an algal-bacterial symbiotic SNAD reactor, and adding a photocatalyst and a multi-walled carbon nanotube into the algal-bacterial symbiotic SNAD reactor. The photocatalytic Fenton-like reactor disclosed by the invention takes porosity modified TAPB-DMTA COF as a photocatalyst aiming at dyestuff which is difficult to degrade, so that complete degradation of the dyestuff is realized. For ammonia nitrogen pollutants, the bacterial-algae symbiotic SNAD reactor cancels traditional mechanical aeration, the microbial extracellular electron acquisition capability is optimized through a biological enhancer, and efficient and green removal of total nitrogen can be realized without adding an organic carbon source.

The invention relates to the technical field of sewage treatment, in particular to a system for efficiently treating livestock and poultry breeding sewage by utilizing algal-bacterial symbiosis, which comprises a solid-liquid separation module arranged on the ground, the solid-liquid separation module comprises a water inlet pipe, a separation box and a filter basket, a nitrification and denitrification tank is arranged on the top of the ground, and a stirring assembly is arranged in the nitrification and denitrification tank; the chemical phosphorus removal module comprises a coagulation, flocculation and sedimentation tank and a stirring assembly, the coagulation, flocculation and sedimentation tank is arranged on the ground, and the stirring assembly is arranged in a coagulation and flocculation area in the coagulation, flocculation and sedimentation tank; according to the system for efficiently treating the livestock and poultry breeding sewage by utilizing the bacterial-algae symbiosis, compared with an existing method for removing the total nitrogen content in the sewage by independently utilizing microorganisms, pollutants in the sewage are synergistically removed in the oxidation pond by utilizing a bacterial-algae symbiosis structure, microalgae and bacteria, so that the energy consumption and the carbon source are saved, and the environmental pollution is reduced. Meanwhile, the sewage treatment effect is improved.

The present invention discloses a method for cultivating activated sludge for efficiently treating coking wastewater. The present invention adopts bio-fortified strains and rice husk biochar to prepare a microbial immobilization carrier, and the carrier is added to a simulated coking wastewater activated sludge treatment system to form bio-fortified activated sludge, which is successively added to simulated coking wastewater with gradually increasing phenol concentration, simulated coking wastewater with gradually increasing nitrogen-containing heterocyclic compound concentration, and simulated coking wastewater with gradually increasing polycyclic aromatic hydrocarbon concentration for three times of acclimation to obtain activated sludge after the third acclimation, and the activated sludge is applied to treat simulated coking wastewater. The activated sludge after the third acclimation of the present invention can simultaneously and efficiently degrade multiple target pollutants in the simulated coking wastewater.

The invention discloses acinetobacter baumannii and application thereof.The acinetobacter baumannii is preserved in Guangdong Microbial Culture Collection Center on August 16, 2024, the preservation number is GDMCC No: 65015, the acinetobacter baumannii has a good denitrification effect, and the degradation rate of ammonia nitrogen reaches 94.93%; the degradation rate on nitrate reaches 99.53%; and the degradation rate of nitrite reaches 96.94%. The immobilized microbial agent is further prepared from the bacillus subtilis and pseudomonas aeruginosa with vibrio parahaemolyticus resistance, and the immobilized microbial agent has good effects in the aspects of denitrification and vibrio parahaemolyticus resistance, especially shows better denitrification effect and antibacterial effect in actual culture application, and has good application prospects.

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 invention discloses application of an anaerobic baffle plate-microbial electrolysis-constructed wetland coupling process in the aspect of rural domestic sewage treatment. The principle is based on a novel volatile fatty acid (VFAs) comprehensive utilization technology. The anaerobic baffle plate-microbial electrolysis-constructed wetland coupling process is mainly composed of a four-compartment anaerobic baffle plate reactor and a multi-section multi-stage microbial electrolysis and horizontal subsurface flow type constructed wetland coupling reactor, and the specific working process is as follows: (1) rural domestic sewage is used as inlet water, firstly enters the anaerobic baffle plate reactor and then enters the horizontal subsurface flow type constructed wetland coupling reactor; carrying out anaerobic hydrolysis to produce VFAs and gas production reaction; (2) starting a microbial electrolysis-constructed wetland coupling reactor; and (3) respectively introducing effluent and produced gas of the anaerobic baffled reactor into a microbial electrolysis-constructed wetland coupling reactor, integrally regulating and controlling the structure and activity of a microbial community, efficiently degrading VFAs into CO2 and CH4, and simultaneously removing nitrogen and phosphorus pollutants, thereby realizing the recycling of sewage treatment.

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 invention relates to the technical field of microorganisms, in particular to acinetobacter YYL-1 and application, and the preservation number of the acinetobacter YYL-1 is CGMCC (China General Microbiological Culture Collection Center) No.28247. The acinetobacter YYL-1 has heterotrophic nitrification-aerobic denitrification one-stop denitrification performance, can realize high-efficiency removal of ammonia nitrogen by a single bacterium in a medium and low temperature environment, especially can realize effective colonization in activated sludge, and enhances the denitrification performance of the activated sludge in a low temperature environment.

The present invention relates to an enhanced operation method of a full-process autotrophic denitrification process, and belongs to the technical field of biological treatment of nitrogen-containing wastewater. The present invention starts the full-process autotrophic denitrification process by setting a sludge internal reflow system on a membrane bioreactor, applying an electromagnetic field generating system on the internal reflow pipeline, and gradually increasing the ammonia nitrogen concentration of the influent. By regulating the magnetic field intensity and application cycle, the reflux ratio in the mixed liquid, and the dissolved oxygen concentration, the growth rate and activity of aerobic ammonia oxidizing bacteria and anaerobic ammonia oxidizing bacteria are promoted, so that the two can coexist harmoniously and efficiently, and the rapid start-up of the full-process autotrophic denitrification process is achieved, and the process operation stability is enhanced. The method to which the present invention belongs has a simple process and mild reaction conditions, and can improve the denitrification effect of the process under medium and low temperature conditions; the internal reflow of muddy water and the higher reflux ratio are conducive to the full mixing of activated sludge and sewage in the reactor, reducing the stirring power demand, reducing the reactor operation cost, and more easily forming granular sludge; the reactor is not limited by the size of the permanent magnet, has no magnetic field attenuation problem, can adjust the magnetic field intensity at any time, has a wider range of application, can be modified on the basis of the existing reactor, and is convenient for engineering application.

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.

The invention relates to the technical field of sewage treatment, and provides filler of porous material coupled magnesium powder as well as a preparation method and application of the filler. The filler for coupling the porous material with the magnesium powder comprises 40-60 parts by mass of magnesium, 20-35 parts by mass of a porous material, 5-20 parts by mass of an inorganic carbon source and 5-10 parts by mass of an adhesive. The porous material coupled magnesium powder filler provided by the invention can be used for treating sewage with low carbon-nitrogen ratio, has a good nitrate-nitrogen treatment effect, and solves the problems of high cost and easy channeling or mineralization of the filler.

The invention provides an autotrophic denitrification filter material and a preparation method and application thereof, and belongs to the technical field of water treatment.The autotrophic denitrification filter material comprises the following raw materials: a main body material, an adhesive, a foaming agent and a slow-release agent, and the main body material is sulfur powder, thiosulfate and pyrite powder; the preparation method comprises the following steps: mixing the main materials to obtain a component A, mixing the slow-release agent to obtain a component B, mixing the component A and the component B, adding water, uniformly stirring, adding the adhesive and the foaming agent, heating, uniformly stirring, and granulating to obtain the filter material. The invention provides an autotrophic denitrification filter material as well as a preparation method and application thereof, and aims of obtaining a light filter material and quickly starting biofilm formation are fulfilled.

The application provides a method for treating municipal domestic sewage by using micro-nano bubble reinforced aerobic granular sludge, inoculates aerobic granular sludge which can simultaneously accumulate nitrous nitrogen and remove pollutants into a sequencing batch reactor, introduces municipal domestic sewage, carries out micro-nano bubble aeration, and operates the reactor in an anaerobic / aerobic / anoxic mode; the micro-nano bubble aeration controls the dissolved oxygen concentration at 2-3 mg / L, so that the self-enrichment and stable operation of anaerobic ammonia oxidation bacteria in the aerobic granular sludge are realized. The method utilizes the high oxygen mass transfer efficiency and long residence time of the micro-nano bubble, strengthens the pollutant conversion process in the system, and ensures a suitable anaerobic microenvironment for the anaerobic ammonia oxidation bacteria in the aerobic granular sludge; under the condition of treating municipal domestic sewage, the average concentrations of COD and ammonia nitrogen in the effluent are as low as 34.65 mg / L and 1.92 mg / L respectively, and the total nitrogen removal rate reaches 82.53%.

The invention discloses a method for enhancing low-temperature biological denitrification of activated sludge, which comprises the following steps: operating a traditional nitrification and denitrification activated sludge reactor at 15 DEG C for 30 days, supplementing a matrix according to inlet water, then transferring to 4 DEG C to stress for 30 days, and supplementing any matrix at the stage, finally, the reactor is continuously operated according to a traditional nitrification and denitrification mode under the condition that the temperature is recovered to 10-15 DEG C, the nitrification effect of the reactor can be improved by 30.31%, the total nitrogen removal rate is improved by 28.57%, and an efficient and stable regulation and control method is provided for improving activated sludge biological nitrogen removal at low temperature.

The present invention discloses an SCR denitration process applied to the treatment of phenylenediamine waste gas, which belongs to the technical field of industrial waste gas treatment and comprises the following steps: injecting a reducing agent into the flue gas upstream of the catalyst, and performing SCR denitration using a modified kaolin-supported vanadium-titanium catalyst. The present invention provides an SCR denitration process applied to the treatment of phenylenediamine waste gas, which can significantly improve the denitration efficiency in the treatment of phenylenediamine waste gas by introducing a modified kaolin-supported vanadium-titanium catalyst prepared by a specific method into the SCR denitration process, and the denitration efficiency can reach 98.3%, which greatly reduces the emission of NOx in the production of phenylenediamine, and effectively improves the quality of the surrounding environment. The catalyst introduced by the present invention not only has good water resistance and sulfur resistance, but also presents good low-temperature catalytic activity and a wide temperature window, and at the same time well avoids the situation where other particulate matter and other sulfides cause catalyst deactivation and poisoning.

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.

The invention discloses an acrylic resin loaded zero-valent iron material as well as a preparation method and an application method thereof, and belongs to the technical field of biological denitrification treatment of sewage. The acrylic resin loaded zero-valent iron material comprises acrylic acid type cation exchange resin, and zero-valent iron is loaded on the acrylic acid type cation exchange resin. The application method comprises the steps that the acrylic resin loaded zero-valent iron material and anaerobic sludge are used for conducting anaerobic ammonia oxidation treatment on wastewater, and the adding mass ratio of the acrylic resin loaded zero-valent iron material to the anaerobic sludge is (3-6): 1; the hydraulic retention time of the wastewater is 6-12 hours. The method is mainly used for shortening the multiplication time of the anaerobic ammonium oxidation bacteria, improving the activity of the anaerobic ammonium oxidation bacteria and the denitrification efficiency of the system and realizing stable and efficient operation of the system.

This invention relates to the technical field of wastewater treatment, and more specifically, to a sludge optimization device and a denitrification system therein. The device includes a tank and a sludge discharge hopper connected to the bottom of the tank. A sludge inlet pipe is connected to the side of the tank, and a sludge outlet pipe is connected to the top of the tank. A centrifugal assembly for separating non-microbial impurities is provided inside the tank. The sludge inlet pipe is located above the centrifugal assembly, and the non-microbial impurities sink to the sludge discharge hopper. A sludge discharge assembly is located at the bottom of the sludge discharge hopper. The sludge optimization device of this invention utilizes the centrifugal force of the centrifugal assembly to separate heavier non-microbial impurities from the sludge, reducing the content of non-microbial impurities in the sludge and improving sludge activity. The denitrification system of this invention, due to the reduced content of non-microbial impurities and increased sludge activity in the returned sludge to the biological treatment tank, improves the treatment capacity of the biological treatment tank and effectively improves the denitrification effect of wastewater with a low C / N ratio.

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 present application relates to an intermittent aeration system of a membrane bioreactor and a control method of the intermittent aeration system, which belongs to the technical field of sewage treatment. The system is applied to a membrane bioreactor system, wherein a gallery is arranged in the membrane bioreactor system, wherein at least one MBR membrane module is arranged in the gallery, wherein the water outlet of each MBR membrane module is connected to one end of a water pipe located in the gallery, and a water pump and a first valve are arranged on the other end of the water pipe; the intermittent aeration system comprises an aeration pipe, a fan unit and a main control module; one end of the aeration pipe is connected to the purge outlet of each MBR membrane module, and a main pipe and a branch pipe are arranged in parallel near one end of the MBR membrane module, and a control valve is arranged on the main pipe and the branch pipe; the other end of the aeration pipe is connected to the air outlet of the fan unit; the main control module is electrically connected to the water pump, the first valve and the control valve, and the main control module realizes intermittent conduction of the main pipe and the branch pipe by controlling the control valve. The present application has the effect of reducing aeration energy consumption and improving endogenous denitrification capacity.

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 discloses a kind of denitration ammonia injection self-rotating reinforced mixing device and the ammonia injection system comprising it, denitration ammonia injection self-rotating reinforced mixing device, including first ammonia injection pipe, second ammonia injection pipe, first deflector and second deflector;The number of second ammonia injection pipe is three or more, the import of each second ammonia injection pipe is communicated with the export of first ammonia injection pipe;Each second ammonia injection pipe corresponds a first deflector and a second deflector;First deflector is arc plate structure, and second deflector is flat plate structure;First deflector one end is connected on the lateral wall of corresponding second ammonia injection pipe export end, and the export of corresponding second ammonia injection pipe is not blocked, the concave surface of first deflector is towards the export of corresponding second ammonia injection pipe, and each first deflector is arranged in propeller type in circumferential direction;Second deflector is connected on corresponding first deflector.The above-mentioned device can form automatically rotating flow disturbance at ammonia injection export, and the uniformity of ammonia-nitrogen mixture is significantly enhanced, without additionally adding static mixer.