71 results about "Simultaneous nitrification-denitrification" patented technology

The invention discloses a device and a method for realizing low-carbon-nitrogen-ratio sewage autotrophic and heterotrophic coupled deep nitrogen and phosphorus removal based on a continuous flow membrane aeration bio-membrane reactor. A hollow fiber membrane is arranged in the continuous flow reactor, and an oxygen concentration gradient is formed through a bubble-free membrane aeration technology. In the biomembrane area, spatial partitions of functional bacteria such as nitrifying bacteria and anaerobic ammonium oxidation bacteria are established, and the two anoxic areas realize efficient nitrogen removal through short-cut denitrification coupling anaerobic ammonium oxidation (PD / A) and synchronous nitrification and denitrification. In the aspect of phosphorus removal, the system adopts an anaerobic-aerobic operation mode, phosphorus-accumulating bacteria release phosphorus anaerobically and absorb excessive phosphorus aerobically, and finally, phosphorus removal is realized through residual sludge discharge. The system integrates an internal carbon source extraction process, recovers a sludge carbon source and supplements an electron donor required by denitrification, and reduces the operation cost and carbon emission. The continuous flow MABR denitrification system enhances the denitrification efficiency of the PD / A system, is suitable for large-scale operation, and efficiently and stably realizes deep denitrification of a low-carbon-nitrogen-ratio urban sewage treatment plant.

The utility model provides a biological nitrogen and phosphorus removal system for sewage, and relates to the technical field of sewage treatment. The system comprises an anaerobic zone, a denitrification anoxic zone, a low dissolved oxygen aeration zone, a solid-liquid separation zone and an equipment zone which are sequentially communicated along a sewage flowing direction, all biochemical areas in the system are operated at high sludge concentration; the anaerobic zone is connected with a water inlet pipe; the solid-liquid separation area is provided with a drainage pipe; and the equipment area comprises stirring equipment and dissolved oxygen providing equipment. According to the biological nitrogen and phosphorus removal system for the sewage, provided by the utility model, the organic matter intake capacity and phosphate release capacity of microorganisms in the anaerobic zone can be improved, and synchronous nitrification and denitrification and denitrification phosphorus removal reaction can be promoted in the denitrification anoxic tank to remove nitrogen and phosphorus; synchronous nitrification and denitrification and phosphorus accumulation reaction can be performed in the low-dissolved-oxygen aeration area, organic matter removal is realized, no additional carbon source is needed, the aeration intensity is small, the operation energy consumption is low, and the treatment effect is good.

A mainstream anaerobic ammonia oxidation enhanced denitrification device and method based on a fluidized bed biofilm. By arranging reaction tanks, switching of two operation modes can be achieved, and recovery of instability in starting and running periods is completed. A denitrification pathway comprises: implementing denitrification and partial denitrification-anaerobic ammonia oxidation synergy in an anoxic zone; and implementing nitrification, synchronous nitrification and denitrification, and partial nitrification-anaerobic ammonia oxidation synergy in an aerobic zone. Implementation of anaerobic ammonia oxidation for denitrification in the anoxic zone or the aerobic zone requires first enhancement of an aerobic biofilm, enhancement of the thickness of the biofilm under the action of high DO, and formation of an internal anoxic / anaerobic layer, thereby providing conditions for enrichment of anaerobic ammonia oxidizing bacteria.

The invention relates to a method for improving resistance of a denitrification strain to a new pollutant perfluorinated compound, and belongs to the field of biological denitrification of sewage. The method comprises the following steps: under an aerobic condition, culturing a denitrification strain by using a sterilized TSB culture medium to obtain OD600 = 1.8; resuspending with a sterile PBS buffer solution to obtain a bacterial suspension; (2) preparing a synchronous nitrification and denitrification culture medium, and sterilizing for later use; (3) respectively adding a perfluorinated compound into the synchronous nitrification and denitrification culture medium, and respectively inoculating the bacterial suspension in the step (1) into the synchronous nitrification and denitrification culture medium containing the perfluorinated compound according to the inoculum size of 1% (v / v); and (4) placing the inoculated synchronous nitrification and denitrification culture medium in an aerobic environment, culturing for 2 hours in a shaking table at the temperature of 30 DEG C and the rotating speed of 150rpm, and carrying out weak ultrasonic treatment on the strain by using an ultrasonic generator. According to the method, the denitrification strain is treated by weak ultrasound, so that the inhibition effect of the perfluorinated compound on the denitrification strain is slowed down, and the resistance of the denitrification strain on the perfluorinated compound is improved.

The invention discloses a device and a method for realizing double-short-range coupling anaerobic ammonia oxidation sewage denitrification by combining biologically-enhanced carbon capture with a two-stage membrane aeration bio-membrane reactor. A high-load activated sludge device and an anaerobic fermentation tank are used for carbon source extraction, and a carbon source is provided for a subsequent anoxic tank. The two-stage MABR system adopts a hollow fiber membrane to perform bubble-free membrane aeration, and oxygen is diffused to form an oxygen concentration gradient, so that the surface of the membrane is divided into an oxygen-rich region and an oxygen-poor region. In the aerobic section, the dissolved oxygen gradient of a biological membrane is regulated and controlled to construct a nitrifying bacterium and anaerobic ammonium oxidation bacterium function partition, so that short-cut nitrification coupled anaerobic ammonium oxidation synergistic denitrification is realized; in the anoxic section, nitrate nitrogen and part of ammonia nitrogen are reduced and COD (Chemical Oxygen Demand) is removed through the synergistic effect of short-cut denitrification and anaerobic ammonia oxidation and synchronous nitrification and denitrification on the surface of the membrane. The two-stage MABR synergistic carbon capture device denitrification system constructed by the method realizes efficient and stable deep denitrification, reduces the addition of a carbon source and the yield of sludge, and saves energy consumption.

This invention relates to the field of deep nitrogen removal technology, specifically to a method for simultaneous nitrification and denitrification deep nitrogen removal in a multi-stage AO process for wastewater. The method is characterized by using multiple functional tanks connected in series to form a multi-stage AO process wastewater biological treatment system, and constructing an activated sludge model. Specifically, the activated sludge model is constructed by: acquiring process parameters and effluent water quality indicators; constructing a complete measured dataset; defining prediction targets and input features; determining whether there is a significant correlation between the input features and the prediction targets, constructing a set of associated inputs, introducing other input features layer by layer as interference features, calculating the first-order correlation coefficient between the predicted targets and input features after introducing interference features; determining whether there is an interference effect in the correlation between the prediction targets and input features based on the first-order correlation coefficient, and updating the set of associated inputs; and iteratively training the activated sludge model based on fused features, virtual data, and the measured dataset.

This invention provides a biological nitrogen and phosphorus removal system and method for wastewater treatment, relating to the field of wastewater treatment technology. The system includes: an anaerobic zone, a denitrification-anoxic zone, a low dissolved oxygen aeration zone, a solid-liquid separation zone, and an equipment zone, sequentially connected along the wastewater flow direction; the anaerobic zone is connected to an inlet pipe; the solid-liquid separation zone is equipped with a drain pipe; the equipment zone includes stirring equipment and dissolved oxygen supply equipment. Each biological tank in the system operates with a high sludge concentration. The system provided by this invention can enhance the ability of microorganisms in the anaerobic zone to absorb organic matter and release phosphates. It can promote simultaneous nitrification-denitrification and denitrification-phosphorus removal reactions in the denitrification-anoxic tank for nitrogen and phosphorus removal. Simultaneous nitrification-denitrification and polyphosphate accumulation reactions can be carried out in the low dissolved oxygen aeration tank, achieving organic matter removal without the need for additional carbon sources, with low aeration intensity, low operating energy consumption, and good treatment effect.

The invention discloses a marine shipping marinobacter SND-2 strain as well as a culture method and application of the marine shipping marinobacter SND-2 strain. According to the invention, a heterotrophic synchronous nitrification and denitrification functional strain SND-2 capable of efficiently degrading nitrogen concentration in a marine culture water body under an aerobic condition is separated from a prawn culture pond, and the strain is identified as Marinobacter nauticus according to colonial morphology and 16S rDNA gene sequencing analysis and phylogenetic analysis, the marine marinobacter SND-2 strain is preserved in the China Center for Type Culture Collection on October 15, 2024 (the preservation number is CCTCC NO: M 20242217). The marine marinobacter SND-2 strain belongs to heterotrophic ammonia oxidizing bacteria, has a heterotrophic nitrification-aerobic denitrification function, can efficiently degrade ammonia nitrogen, nitrite nitrogen, nitrate nitrogen and total nitrogen concentration in a marine culture water body under an aerobic condition, has no toxic effect on aquatic animals, and can be applied to ecological restoration of a seawater water environment.

The application discloses a high-ammonia-nitrogen wastewater simultaneous nitrification and denitrification and chromium remediation method based on a microorganism-promoter combination. 12 The combination is composed of simultaneous nitrification and denitrification bacteria and sodium azide (NaN3), alanine and dodecamolybdenum phosphate (PMo 12 ) and is used for detoxifying dissolved heavy metal chromium and improving denitrification efficiency. The method is to culture SND simultaneous short-cut nitrification and denitrification biological bacteria under aerobic conditions, inoculate the biological bacteria into a high-chromium solution, add biological promoters, promote the growth of microorganisms and the conversion of nitrogen, continuously receive and provide electrons in a reversible oxidation-reduction process, thereby reducing the total activation energy of the reaction and efficiently detoxifying heavy metal chromium. The microorganism-promoter combination technology obtained in this way can not only realize efficient simultaneous nitrification and denitrification in high-ammonia-nitrogen wastewater, but also maintain the biological activity of the SND bacteria in a high-chromium environment, thereby providing reliable technical support for efficient chromium removal and toxicity remediation of high-ammonia-nitrogen wastewater.

The invention discloses split-flow vertical water treatment equipment based on an MABR (Membrane Aerated Baffled Reactor) membrane, which belongs to the technical field of water treatment, adopts a strategy of upper and lower static zoning and fluid split-flow disturbance optimization, and is matched with intermittent and low-intensity fluid pulse and gas pulse to realize mass transfer enhancement and membrane pollution control. Specifically, a reactor is divided into an upper reaction zone and a lower anaerobic zone by using a double-layer flow guide table, a flow distribution structure is additionally arranged in the lower anaerobic zone, sludge slides down from the top of a cylinder wall in a film shape to form a water curtain, sewage is jetted upwards from two sides of the bottom to form efficient countercurrent contact, phosphorus release and partial hydrolytic acidification are carried out, and the sludge is discharged. Treated sewage is conveyed upwards under the drainage effect of the double-layer flow guide table, water flow is evenly distributed upwards through the flow distribution guide mechanism, strong turbulent flow is generated, the hydraulic shear force on a biological membrane on the outer surface of the MABR membrane wire set is improved, stable formation and efficient cooperation of an aerobic zone (near membrane side) and an anoxic zone (far membrane side) are facilitated, and the synchronous nitrification and denitrification efficiency is improved.

The utility model discloses a low oxygen synchronous nitrification and denitrification reactor, which relates to the field of sewage treatment, including a fixed base, a denitrification treatment tank and a liquid discharge pipe, wherein a nitrification reaction tank is arranged on one side above the fixed base, and a liquid inlet pipe is fixedly connected to one side of the top of the nitrification reaction tank, and an air inlet pipe is fixedly connected to one side of the bottom of the nitrification reaction tank, and the denitrification treatment tank is arranged on one side of the nitrification reaction tank, and a stirring assembly is arranged inside the nitrification reaction tank and the denitrification treatment tank. The low oxygen synchronous nitrification and denitrification reactor is provided with a stirring assembly and a limiting assembly, so that the substances inside the reactor are fully stirred and mixed, so that the reaction between the substances is more sufficient and the reaction efficiency is improved, and at the same time, the electrolysis components are limited and protected to ensure the smooth progress of the denitrification process of the substances, and it is convenient for the staff to use the nitrification and denitrification reactor.

The invention relates to a low-carbon-nitrogen-ratio sewage and wastewater synchronous nitrification and denitrification-polyculture denitrification nitrogen and phosphorus removal method and a reactor. According to the method, iron shaving / elemental sulfur composite filler is arranged in each stage of reactor; the method comprises the following steps: S1, enabling sewage and wastewater with a low carbon-nitrogen ratio to enter a primary aerobic reactor, and carrying out a synchronous nitrification and denitrification process; the treated effluent is subjected to a polyculture denitrification process in a second-stage anoxic reactor; and finally, carrying out an aerobic denitrification process in a three-stage aerobic reactor. S2, enabling the water treated in the step S1 to enter a sedimentation tank, carrying out solid-liquid separation, then discharging, enabling part of settled sludge to flow back to the primary aerobic reactor, and enabling part of settled sludge to serve as residual sludge to be discharged. The nitrogen and phosphorus removal method and the reactor have the advantages of small demand on exogenous organic carbon, low sludge yield and low operation cost, and can realize efficient and stable removal of nitrogen, phosphorus and organic matters in the effluent.

The invention belongs to the field of environmental microbiological technology and wastewater biological treatment, and particularly discloses a synchronous nitrification and denitrification acid-eating bacterium and application thereof in wastewater treatment. The strain is Acidovorax sp. LM14, and is preserved in China Center for Type Culture Collection, called CCTCC for short, the preservation address is Wuhan University Life Science College, Wuchang District, Wuhan City, Hubei Province, the preservation date is November 10, 2025, and the preservation number is CCTCC M 20252521. The strain has a heterotrophic nitrification-aerobic denitrification capability, can synchronously and efficiently remove ammonia nitrogen, nitrite nitrogen and nitrate nitrogen under an aerobic condition, and still can efficiently remove wastewater with the ammonia nitrogen concentration of 500mg / L. Meanwhile, the strain can effectively degrade aromatic pollutants such as phenol, and the degradation rate exceeds 90% when the concentration of phenol is as high as 500mg / L. In addition, the LM14 still keeps high denitrification activity under the condition of low carbon nitrogen ratio, and has a wide application range to pH and temperature.

The utility model relates to the technical field of sewage treatment, in particular to a sewage treatment system, which comprises a primary sedimentation tank, a synchronous nitrification and denitrification subsystem and a final-stage sedimentation tank which are sequentially communicated, and is provided with an electrolytic dephosphorization device and a liquid conveying device, and a liquid inlet of the electrolytic dephosphorization device is communicated with the bottom of the final-stage sedimentation tank through the liquid conveying device; a liquid outlet of the primary sedimentation tank is connected into the primary sedimentation tank; when the system runs, low-phosphorus turbid liquid at the bottom of the final-stage sedimentation tank is fed into the electrolytic dephosphorization device through the liquid conveying device, the turbid liquid carries metal ions generated by electrolysis to return to the primary sedimentation tank while washing a polar plate, the metal ions are combined with phosphorus in the primary sedimentation tank to form precipitates to realize dephosphorization, and supernate enters a subsequent treatment unit. Due to the low-phosphorus characteristic of the final-stage precipitation solution, the formation of phosphate in the electrolytic dephosphorization device is avoided, and the sewage treatment system does not need to be additionally provided with a sewage storage tank for storing the precipitate in the final-stage precipitation tank, so that the occupied area of the sewage treatment system is reduced.

The invention discloses a pseudomonas stutzeri SND-1 strain as well as a culture method and application thereof. According to the invention, a broad-salt synchronous nitrification and denitrification functional strain SND-1 capable of efficiently degrading nitrogen concentration in an aquaculture water body is separated from a prawn aquaculture pond, and the strain is identified as Stutzeria stutzeri according to colonial morphology and 16S rDNA gene sequencing analysis and phylogenetic analysis, the pseudomonas stutzeri SND-1 strain is preserved in the China Center for Type Culture Collection (the preservation number is CCTCC NO: M 20242216) on October 15, 2024, and the pseudomonas stutzeri SND-1 strain is preserved in the China Center for Type Culture Collection (CCTCC). The pseudomonas stutzeri SND-1 strain belongs to heterotrophic ammonia oxidizing bacteria, has a heterotrophic nitrification-aerobic denitrification function, can efficiently degrade ammonia nitrogen, nitrite nitrogen, nitrate nitrogen and total nitrogen in fresh water, seawater and aerobic environments, has no toxic effect on aquatic animals, and can be applied to ecological restoration of fresh water or seawater water environments.

The invention relates to the technical field of biological sewage treatment, and discloses a synchronous nitrification and denitrification phosphorus removal treatment device for sewage, which comprises a mainstream SBR (sequencing batch reactor), a side flow SBR is arranged on one side of the mainstream SBR, and a water inlet barrel and a water outlet barrel are arranged on the other side of the mainstream SBR. A solid-liquid separation assembly and a flow division assembly are arranged between the main flow SBR reactor and the side flow SBR reactor, the solid-liquid separation assembly can separate sludge from clear liquid in sewage, when the sewage passes through the filter screen plate, the sludge is intercepted, the supernatant penetrates through meshes, and the supernatant penetrating through the filter screen plate falls back into the main flow SBR reactor from a lower flow opening; the inclination angle of the inclined plate is increased through the inclination increasing assembly, and the filter screen plate is driven to rotate to block the downward flowing opening, so that the intercepted sludge flows down along the inclined surface to enter the side flow SBR reactor under the increasing of the inclination angle of the inclined plate and the action of gravity, and thorough separation of the sludge and the supernate is realized.

The invention relates to a device and a method for rapidly recovering denitrification performance of a synchronous nitrification and denitrification process impacted by low COD / N, and belongs to the technical field of biological sewage treatment. The device comprises a sewage tank, an SBBR (Sequencing Batch Biofilm Reactor), a blast aerator, a water outlet tank and an online monitoring device. The method comprises the following steps: 1) impacting a synchronous nitrification and denitrification process of a sequencing batch bio-membrane reactor by low-COD / N sewage and inhibiting denitrification performance, then adding high-COD / N sewage and adding biodegradable polylactic acid micro-plastic into the SBBR reactor to recover synchronous nitrification and denitrification; and 2) gradually reducing the DO concentration of the aeration section to promote recovery of synchronous nitrification and denitrification, and enabling the synchronous nitrification and denitrification rate and the organic matter removal rate to be stable. By adding the biodegradable polylactic acid micro-plastic, synchronous nitrification and denitrification in the biological membrane can be promoted. By gradually reducing the DO concentration, synchronous nitrification and denitrification can be rapidly recovered in situ and kept stable.

The invention discloses a refractory sewage treatment process based on EBIS and improved BAF coupling, and relates to the technical field of sewage treatment, EBIS effluent enters an intermediate sedimentation tank for solid-liquid separation, part of precipitated sludge flows back to an inlet of an EBIS reactor to maintain high biological concentration, and residual sludge is discharged; the method comprises the following steps of: feeding a supernatant into an improved BAF (Biological Aerated Filter), filling the improved BAF with a porous modified composite filter material, and forming a stable biological membrane activated carbon composite functional layer on the surface of the filter material by adopting a pulse intermittent aeration and air-water backwashing linkage mode so as to perform deep adsorption and synchronous nitrification and denitrification biomineralization on intermediate metabolites in EBIS effluent. Through efficient coupling of the EBIS and the improved BAF, stage treatment and deep purification of the refractory industrial wastewater are realized, and the problems of low treatment efficiency, poor stability and high energy consumption of a single process and a traditional coupling process are effectively solved.

The invention provides a bacterial fiber matrix purifier, which integrates a bag type fiber biological filtration matrix and a synchronous nitrification and denitrification mechanism, and has triple advantages of simple structure, efficient decontamination and resource circulation; a modified plastic fiber cloth bag is adopted to synchronously complete physical filtration, biological reaction and microbial film treatment, a vertical flow precipitator, a microfilter, a protein separator and a biological fluidized bed are completely replaced, and the equipment investment is reduced; through the back flushing design of the bottom of the central water inlet pipe, sewage is distributed in a fluidization mode in the bag, macromolecular organic matter is decomposed into biological floccules capable of being eaten by fishes in combination with bacterium-carbon coupling targeted control, the recycling rate of residual feed and excrement is high, meanwhile, high-energy-consumption equipment is omitted, and energy consumption of the system is reduced; the system not only can independently operate in land-based industrial aquaculture to realize a zero-emission carbon sink fishery mode, but also can be used as a front-end pretreatment unit of an existing RAS or an advanced treatment module of a sewage treatment plant, so that the load of a subsequent ecological pool is greatly reduced, and the standard recycling of aquaculture tail water is promoted.

The invention discloses an artificial microbial multicellular high-ammonia nitrogen wastewater treatment bacterial community, a promoter, a construction method and an application thereof. The bacterial community comprises at least two of Bacillus haynesii strain ZJB21169, Bacillus subtilis strain ZJB21170, Stenotrophomonas rhizophila strain ZJB21172, Proteus alimentorum strain ZJB21171 and Paracoccus kondratievae strain ZJB21134. The composite bacterial community is added to a prepared nutrient agent to obtain a microbial nutrient agent, which is used for denitrification in a sewage treatment system. The nutrient enhancer comprises, by weight, 245-450 parts of amino acids, 90-223 parts of metal salts, 0-50 parts of choline and 0-50 parts of B vitamins. The present invention adds a self-developed promoter to assist the GZBS process in strengthening the denitrification process of micro-aerobic activated sludge, and establishes an artificial microbial multicellular biochemical treatment system with synchronous nitrification and denitrification bacteria as the community advantage. The system has high denitrification efficiency and no secondary pollution. It has broad application prospects in biological denitrification treatment, especially for the denitrification treatment of high-ammonia nitrogen landfill leachate.

The invention relates to a domestic waste incineration plant leachate treatment system and a use method thereof, and relates to the technical field of sewage and wastewater treatment.The domestic waste incineration plant leachate treatment system mainly comprises a pretreatment system, an anaerobic system, an MABR biochemical system, a deep treatment system and an auxiliary system which are sequentially arranged, the auxiliary system comprises a sludge system, a heat exchange system, a dosing system and an odor collection system. The pretreatment system is used for removing most suspended matters, the heating system is used for preserving heat, the UASB reactor is used for performing anaerobic digestion and efficiently degrading organic matters, the MABR biochemical system is used for synchronously performing nitrification and denitrification for nitrogen removal, the heat exchange system is used for controlling the water temperature of the MABR biochemical system to be stable, the tubular ultrafiltration system is used for realizing separation of sludge age and hydraulic retention time, and the MABR biochemical system is high in microbial diversity and low in sludge yield; further pollutant removal is carried out through deep treatment, and finally, stable effluent quality is ensured. The device can realize full-quantitative treatment of the leachate of the household garbage incineration plant, and has the advantages of small occupied area, low carbon emission, low operation cost and the like.

The application discloses a novel combined suspended ball filler for simultaneous nitrogen and phosphorus removal in a biochemical aerobic section, which is filled into a porous suspended ball by a mixed material composed of a composite sulfur component filler and a porous sponge. The novel combined suspended ball filler can be used in the biochemical aerobic section, can enrich the microbial biofilm on one hand, and can successfully remove nitrate nitrogen by increasing the composite sulfur component filler on the other hand, so that simultaneous nitrification and denitrification is achieved, nitrate nitrogen and ammonia nitrogen are removed at the same time, the nitrogen and phosphorus removal effect is improved, and the proportion of the composite sulfur component filler and the porous sponge can be flexibly adjusted according to different water quality conditions, so that efficient nitrogen and phosphorus removal can be realized in different wastewaters.

The invention relates to the technical field of sewage treatment, and particularly discloses an improved continuous flow AO device with a sequencing batch regulation mechanism, and a flow regulation unit is configured between a raw water inlet bucket and an anoxic reaction tank; an adjusting device is arranged between the anoxic reaction tank and the aerobic reaction tank; a filler is arranged in the anoxic reaction tank; the aerobic reaction tank is provided with an aeration device; a sludge return loop is arranged between the secondary sedimentation tank and the anoxic reaction tank; a nitrification liquid backflow loop is arranged between the aerobic reaction tank and the anoxic reaction tank; according to the device, sequencing batch operation is utilized, and a large number of anoxic zones are formed in the aerobic reaction tank to create conditions for synchronous nitrification and denitrification; meanwhile, in a nitrate nitrogen and ammonia nitrogen coexistence environment in the anoxic reaction tank, sequencing batch operation strengthens the operation efficiency of the system, and shorter anoxic reaction time promotes nitrate nitrogen to be reduced into nitrite nitrogen; the filler is combined to provide a carrier for the growth of anaerobic ammonium oxidation bacteria, so that the enrichment of the anaerobic ammonium oxidation bacteria is realized, and the denitrification contribution of short-cut denitrification coupled anaerobic ammonium oxidation is promoted.

The invention discloses a device and a method for realizing short-cut nitrification and short-cut denitrification coupled anaerobic ammonia oxidation low-carbon-nitrogen-ratio sewage denitrification based on a two-stage membrane aeration bio-membrane reactor. According to the device, a hollow fiber membrane is adopted as an oxygen transfer medium, and oxygen is diffused through the membrane to form an oxygen concentration gradient through a bubble-free membrane aeration technology, so that the surface of the membrane is divided into an oxygen-enriched region and an oxygen-poor region. In the anoxic zone, the system performs short-cut denitrification coupled anaerobic ammonia oxidation (PD / A) reaction, and performs synchronous nitrification and denitrification in the biological membrane zone at the same time, so that partial reduction of ammonia nitrogen and removal of COD (Chemical Oxygen Demand) are realized; and in the aerobic section, functional partitions of nitrifying bacteria and anaerobic ammonium oxidation bacteria are established by controlling the dissolved oxygen concentration gradient on the biological membrane, so that short-cut nitrification coupled anaerobic ammonium oxidation denitrification is realized. According to the two-stage MABR denitrification system, the energy loss is reduced, the denitrification contribution rate of anaerobic ammonia oxidation is enhanced, an efficient solution is provided for deep denitrification of sewage with a low carbon-nitrogen ratio, and the two-stage MABR denitrification system has an application prospect.

The application discloses a low-carbon and high-efficiency seawater breeding wastewater treatment device and method, wherein the device comprises a sequencing batch reactor and a modified hollow fiber membrane assembly arranged in the sequencing batch reactor, and is provided with a stirring, constant temperature, monitoring and aeration control unit. The method strengthens the microbial biofilm by the modified membrane assembly, adopts a salinity and antibiotic gradient domestication strategy, constructs a stable simultaneous nitrification and denitrification (SND) process under a low dissolved oxygen (DO<0.2 mg / L) condition, and realizes efficient and collaborative removal of carbon, nitrogen pollutants and antibiotics. The application significantly improves the stability of the system against salinity and antibiotic impact, reduces the aeration energy consumption, effectively solves the problem that the microbial activity is inhibited when the traditional biological process is used to treat high-salinity and antibiotic-containing seawater breeding wastewater, and provides a reliable technical scheme for low-carbon and high-efficiency treatment of seawater breeding wastewater.

The invention relates to the technical field of sewage and wastewater and sludge treatment, and discloses an upgrading expansion system and method for a sewage and wastewater treatment plant, and the upgrading expansion system comprises a grit chamber, an anaerobic tank, an anoxic tank, an aerobic tank, a secondary sedimentation tank and an efficient sedimentation tank which are sequentially connected according to the water flow direction, the activated sludge quality-divided optimization treatment unit is connected between the secondary sedimentation tank and the anaerobic tank; an MABR module is arranged in the anoxic tank, and the MABR module performs synchronous nitrification-denitrification; the activated sludge quality-divided optimization treatment unit comprises first-stage treatment, second-stage treatment and third-stage treatment, impurity fibers in activated sludge are removed in a physical mode in the first-stage treatment, sand is removed through cyclone separation in the second-stage treatment, and separated sludge liquid with high sand content is discharged into an efficient sedimentation tank; and in the third-stage treatment, centrifugal sludge densification treatment is carried out to obtain dense sludge, and the dense sludge flows back to the anaerobic tank to realize enrichment. According to the invention, quality and efficiency improvement and maximum 50% in-situ capacity expansion of the sewage and wastewater treatment plant are realized.

The invention belongs to the technical field of wastewater treatment, and particularly relates to an artificial wetland system and a method for treating low-carbon high-nitrate-nitrogen wastewater. Comprising a system main body, and a litter layer, an aerobic layer, a facultative anaerobic layer, an anaerobic layer and a supporting layer are sequentially arranged in the system main body from top to bottom in the height direction of the system main body; the aerobic layer is formed by taking first sludge biochar as a carrier and loading domesticated aerobic microorganism sludge; the anaerobic layer is formed by taking second sludge biochar as a carrier and loading domesticated anaerobic microorganism sludge. The litter layer is used as a supplementary carbon source, aerobic microorganisms are valued through the aerobic layer, anaerobic microorganisms are valued through the anaerobic layer, and an aerobic-anaerobic synergistic environment is constructed through the litter layer, the aerobic layer, the facultative anaerobic layer, the anaerobic layer and the supporting layer, so that the synchronous nitrification-denitrification efficiency is improved, and the denitrification capacity of the low-carbon high-nitrate-nitrogen wastewater is remarkably improved.

The present application relates to a kind of enhanced denitrification and phosphorus removal sewage treatment device, including the anaerobic pool, anoxic pool, first composite biochemical pool and second composite biochemical pool connected in sequence, first composite biochemical pool is equipped with several composite biological carrier components, and is equipped with first aeration pipe;Second composite biochemical pool is equipped with several MABR membrane components;Anaerobic pool is equipped with first exhaust pipe, and the gas outlet end of first exhaust pipe is equipped with several first branch pipe;Anoxic pool is equipped with second exhaust pipe, and the gas outlet end of second exhaust pipe is equipped with several second branch pipe, and first branch pipe and second branch pipe are connected first aeration pipe and several MABR membrane components respectively;Composite biological carrier component surface load aerobic microorganism, and the membrane filament surface of MABR membrane component is loaded aerobic microorganism, anoxic microorganism and anaerobic microorganism from inside to outside, realizes simultaneous nitrification and denitrification.

The application discloses a refractory wastewater treatment process based on coupling of EBIS and improved BAF, relates to the technical field of wastewater treatment, and discloses the following technical scheme: EBIS effluent is introduced into an intermediate sedimentation tank for solid-liquid separation, part of the sludge is backflowed to the inlet of the EBIS reactor to maintain high biological concentration, and the remaining sludge is discharged; the supernatant is introduced into an improved BAF tank by gravity, the improved BAF tank is filled with porous modified composite filter material, and a pulse intermittent aeration and air-water backwashing linkage mode is adopted to form a stable biological membrane activated carbon composite functional layer on the surface of the filter material, so that the intermediate metabolites in the EBIS effluent are subjected to deep adsorption and simultaneous nitrification and denitrification biological mineralization. Through the efficient coupling of EBIS and improved BAF, the application realizes the staged treatment and deep purification of refractory industrial wastewater, and effectively solves the problems of low treatment efficiency, poor stability and high energy consumption of single process and traditional coupling process.