123results about How to "Improve nitrification capacity" patented technology

The present invention relates to an integrated closed loop system for aquaculture in at least one culturing tank and using continuous bioreactor technology for the biological treatment and removal of organic material, nitrogen and phosphorous, comprising: an integrated, partially or wholly closed loop system for waste water treatment, where the water contains nitrogen containing compounds and/or substances, comprising at least one production unit of such nitrogen containing compounds and/or substances and using continuous bioreactor technology for the biological treatment and removal of organic matter, nitrogen and phosphorous from the said water at continuous flow, comprising: a) at least one suspended carrier bioreactor for bacterial growth under anoxic conditions to cause anaerobic denitrification, with one or several compartments, preceding b) at least one suspended-carrier bioreactor for bacterial growth under oxic conditions to cause aerobic nitrification, c) the denitrification taking place after the production unit, and d) the nitrification taking place prior to the production unit in a by-pass mode as part of the continuous flow.

The invention belongs to the field of sewage ecological treatment, and the purpose is to provide a device and a method for sewage decentralized treatment in circulating vertical flow constructed wetlands. The invention comprises the following aspects: 1) the high-efficient circulating vertical flow constructed wetland system comprises three main components of a vertical flow constructed wetland, a circulating water tank, and a reinforced adsorption column; 2) the operation modes comprise an intermittent mode and a continuous mode. Fillers of the constructed wetland are proportional compositions of several fillers which are low in price and high in adsorption capacities for nitrogen and phosphorus; plants which have strong durability against pollution and have landscape value (thalia dealbata or day lily) or economic value (hybrid pennisetum) are planted on the wetland surface. The invention adopts the high-efficient filler composition to reinforce nitrogen and phosphorus adsorption; effluent backflow increases the dissolved oxygen inside the vertical flow constructed wetland, and enhances the nitration capability of microbes in the wetland; the denitrification capability is enhanced; the contact time of sewage and the fillers is increased; and the removal of phosphorus is enhanced. Series-parallel combinations can be selected flexibly with respect to different sewage types, and the applicability is strong.

The invention relates to a biology processing apparatus capable of processing sewage at low-temperature with low carbon-nitrogen-ratio in a cold region and a method for processing sewage at low-temperature with low carbon-nitrogen-ratio in the cold region, which relates to the biology processing apparatus for processing sewage and the method for processing sewage. According to the invention, problems that the ratio of carbon source and nitrogen source of sewage in winner at the cold region is low, the synchronization nitrogen and phosphorus removal efficiency in the current sewage processing technology is low, the index of nitrogen and phosphor in a processed effluent can not reach the standard can be solved. The apparatus comprises a water storage tank, a pre-conditioning hypoxia pool, an anaerobic pond, an anoxic pool, an aerobic tank, a sedimentation basin, an aeration head, a filling material, a stirrer, a water inlet pump, a reflux pump, a valve, an outlet pipe, a sludge discharge pipe and a residual sludge discharge pipe; The method comprises the following steps: 1)culturing microbe on a filling material; 2)adjusting operation parameter; 3)adjusting reflux ratio parameter; 4)passing the sewage through the pre-conditioning hypoxia pool, the anaerobic pond, the anoxic pool, the aerobic tank and the sedimentation basin for processing to obtain the processed water. The apparatus and the method can be used for construction and reconstruction of the sewage processing technology at low-temperature with low carbon-nitrogen-ratio in a north region.

The invention discloses an immobilized nitrobacteria enrichment culture method and device in a sewage treatment process. A sequencing-batch biomembrane activated sludge process is utilized to perform enrichment culture on nitrobacteria: dewatered sludge is inoculated in an immobilized nitrobacteria culture device, and an enrichment culture solution is added; and in the nitrobacteria enrichment culture process, the biomembrane ammonia nitrogen load is gradually enhanced, and the pH value is controlled. The enrichment culture solution is formed by mixing NH4HCO3 and pretreated municipal sewage, the ammonia nitrogen concentrations are respectively 100, 300, 500, 700 and 1000 mg/L, and the COD (chemical oxygen demand) concentration is 30-60 mg/L. By controlling the immobilized nitrobacteria culture device, the DO in the reaction mixture is 2-6 mg/L, the pH value is 6.5-8.0, the biofilm-formation acclimatization culture temperature is 10-14 DEG C, and the enrichment purification culture temperature is 15-25 DEG C. The device can be used for culturing nitrobacteria at low temperature, and the nitrobacteria content is up to 40-45%. The immobilized nitrobacteria have high low-temperature nitration resistance, and can treat the wastewater of which the ammonia nitrogen concentration is up to 1000 mg/L, so that the ammonia nitrogen in the wastewater is lowered to 1.0 mg/L or below.

The invention discloses a method for degrading ammonia nitrogen in high-salinity sewage by microbes, wherein a treatment system in the method comprises an anaerobic biochemical reaction tank, a first-stage aerobic biochemical pool and a second-stage aerobic biochemical pool. Firstly, the sewage and the recirculation water simultaneously flow into the anaerobic biochemical reaction tank to be treated by denitrification and hydrolysis reaction; then, the sewage orderly flows into the first-stage aerobic biochemical pool and the second-stage aerobic biochemical pool to be respectively treated by first-stage aerobic treatment and the second stage aerobic treatment; the active sludge in the first-stage aerobic biochemical pool is the domesticated salt-tolerant bacteria for performing first-stage nitration on the ammonia nitrogen, and besides the domesticated salt-tolerant bacteria, efficient nitrifying bacteria are also added into the second-stage aerobic biochemical pool for performing second-stage high-strength nitration on the ammonia nitrogen=, thus, the effluent ammonia nitrogen and the COD (Chemical Oxygen Demand) can reach the emission standard.

The invention relates to a new high-nitrogen organic sewage treatment biochemical denitrification process. The process mainly comprises the following technical steps of: 1, feeding raw sewage which accords with conditions into an upflow anaerobic sludge blanket (UASB); and simultaneously feeding reflow mixed solution of a subsequent oxidation nitration tank (O1) and a part of thick solution of a membrane bioreactor (MBR) ultra-filtration membrane separation device into the UASB; 2, simultaneously feeding effluent of the UASB, a part of thick solution of the MBR ultra-filtration membrane separation device and air into the oxidation nitration tank (O1); 3, feeding the effluent of the O1 tank into a denitrification tank (a tank A) of anoxic zone/aerobic zone A/O(2), simultaneously feeding the remaining sludge of the UASB and replenishing carbon, forming an anoxic condition at the tank A to perform denitrification, replenishing the part of thick solution of the MBR ultra-filtration membrane separation device and supplying air (oxygen) into the O(2) tank to further perform oxidation nitration reaction respectively, and removing chemical oxygen demand (COD), biochemical oxygen demand after 5 days (BOD5), total nitrogen (TN) and NH3-N; and 4, feeding the effluent of the A/O (2) into the MBR ultra-filtration membrane separation device, intercepting the active sludge and macromolecularCOD and enriching in the thick solution; feeding the thick solution into the UASB, the O1 tank and the A/O (2) tank respectively; performing sludge dehydration treatment on the remaining thick solution; and removing the COD and the BOD5. The total nitrogen removal rate of the technology is improved by over 50 percent.

The invention relates to a filtration-fabric anti-clogging strengthening compound flow constructed wetland domestic sewage treatment system comprising a pretreatment region, a main reaction region andan exhalant region, wherein the pretreatment region comprises a framed tube, an intake pipe, a filter bag, an air inlet pipe and a porous aerator; the main reaction region is formed by connecting a first unit, a second unit and a third unit in series; the bottom of the main reaction region is provided with a gravel water-distribution layer; a biological porcelain granule layer is distributed in the first unit; gravel and a steel slag layer are distributed in the second unit; a zeolite layer is distributed in the third unit; each unit is divided into a left grid and a right grid; the left gridis higher than the right grid; the top of an aquatic plant root region in the left grid is provided with a triangular weir; the pretreatment region and the main reaction region are connected by a perforated water-distribution plate which is arranged at one end of a gravel water-distribution layer; and the exhalant region comprises an exhalent pipe which is arranged at one side of the main reaction region. The invention has the advantages of high pollutant removal rate, stable system operation, greatly improved hydraulic load, small floor area, low operation and maintenance costs, and the like.

The invention provides a sewage denitrification and phosphorous removal system. The sewage denitrification and phosphorous removal system comprises an anaerobic tank, a mud-water separation unit, a nitrification unit, an oxygen-poor tank, an aerobic tank and a secondary sedimentation tank, wherein raw water and reflowing sludge 1 of the secondary sedimentation tank enter the anaerobic tank; a mixed solution of the anaerobic tank enters the mud-water separation unit; supernatant of the mud-water separation unit and reflowing sludge 2 of the secondary sedimentation tank enter the nitrification unit; a mixed solution of the nitrification unit and sludge of the mud-water separation unit enter the oxygen-poor tank; a mixed solution in the oxygen-poor tank sequentially enters the aerobic tank and the secondary sedimentation tank. The sewage denitrification and phosphorous removal system provided by the invention can realize deep denitrification and phosphorous removal of municipal wastewater treatment and is applicable to newly built sewage plants, and modification of built sewage treatment plants is easy to realize.

The invention discloses a process method of an MBBR (Moving Bed Biofilm Reactor) for treating urban sewage. The process method comprises the steps that suspended matters and part of organic matters in the urban sewage which is subjected to primary treatment are removed, then the urban sewage enters into an anaerobic zone, an aerobic zone and an anoxic zone of the MBBR in sequence by an intake sump, and enters into a secondary sedimentation tank through the anoxic zone; carriers are suspended in the anaerobic zone of the MBBR, and the surfaces of the carriers are attached with nitrobacteria, which is conductive to growth of the nitrobacteria with long sludge age, the organic matters can be subjected to degradation treatment by activated sludge in all zones, and phosphorus in the sewage is processed by the activated sludge, so as to realize simultaneous nitrogen and phosphorus removal. The process method disclosed by the invention has the characteristics that the effect of nitrogen and phosphorus removal is good and the utilization rate of organic matters is high, meanwhile, the sludge production is low, the nitrification liquid reflux does not exist, the operation cost is reduced, and the process method is particularly suitable for treating domestic sewage with low ratio of C/N.

The invention discloses an MSBR (Modified SBR) nitrogen and phosphorus removal technique based on an MBBR, and belongs to the technical field of sewage treatment. The technique is based on a system consisting of seven units, including a sludge concentration area, a hypoxic preconditioning area, an anaerobic area, an anoxic zone, an aerobic MBBR area, a sequencing batch reaction I area and a sequencing batch reaction II area, wherein suspended packing is all dropped into the aerobic MBBR area, a medium hole perforating aeration system is arranged at the bottom of the aerobic MBBR area, a water distribution system is arranged at a water inlet, and an interception screening system is arranged at a water outlet. According to the MSBR nitrogen and phosphorus removal technique based on the MBBR disclosed by the invention, the advantages of an MSBR technique and the MBBR technique are combined, the technique has the advantages of high volume load and stable effluent effect, and is suitable for carrying out update or capacity increasing transformation on the original MSBR technique, so that the treatment capability of the existing technique is promoted, and meanwhile, the technique is applied to new construction items, so that the occupied area can be greatly reduced.

The invention belongs to the field of domestic sewage purification, and relates to a method for treating domestic sewage by adopting a four-stage three-phase step-feed deep nitrogen removal system. The method solves the problems that the conventional domestic sewage treatment process is poor in nitrogen removal effect and difficult to reach the specified standards, and can fulfill the upgraded reforming goal of the conventional sewage plant on the premise that the civil facilities are not changed. The method comprises the step of respectively delivering the domestic sewage to a reactor from anoxic zones of four stages, wherein the anoxic zones and aerobic zones are arranged at intervals, so that nitration liquid reflux facilities of the system are saved; and sludge reflux is only performed in the first anoxic zone, so that the energy is saved and nitration liquid required by denitrification can be supplied to the first anoxic zone. A fluidized filling material is added into the aerobic zones, and a fluidized bed is organically combined with a step-feed process, so that the advantages of increasing the biomass and the bioactivity of the system, reducing sludge, enhancing the three-phase system in the system and the like are achieved.

The invention discloses a multi-stage combined-cycle sewage treatment method, which is adaptable to two-stage plug-flow urban sewage treatment plants. An aeration tank of the two-stage plug-flow urban sewage treatment plant is divided into an anoxic zone and an adding zone of suspension filling material, wherein the anoxic zone is arranged at the rear end of the aeration tank and communicated with a water inlet of the aeration tank and the adding zone of suspension filling material is arranged behind the anoxic zone. The adding zone of suspension filling material is divided into a plurality of processing units, each processing unit comprises two galleries, each gallery is internally equipped with a diving propeller, each processing unit is internally provided with a baffle wall, two ends of the baffle wall and two side walls of the aeration tank are provided with openings, and under the propelling of the diving propeller, suspension filling material and mixed liquor placed in the adding zone of suspension filling material circulate and flow along the galleries. The invention enables the sewage entering the adding zone of suspension filling material to realize multi-stage multi-time circulatory flow in the adding zone of suspension filling material, thereby increasing the effect of sewage treatment.

The invention relates to a mariculture wastewater treatment system and treatment method. The mariculture wastewater treatment system comprises a slanting board sedimentation pool and a three-section nitrogen and phosphorus removal pool which communicate with each other, wherein the three-zone nitrogen and phosphorus removal pool comprises a water distribution area, an anoxic zone, an aerobic zone, a phosphorous removal zone and a water collection area which are arranged in sequence, the anoxic zone is filled with gravel substrates, the aerobic zone is filled with zeolite substrates and equipped with a perforated aerator pipe, the phosphorous removal zone is filled with phosphorous removal functional filler substrates, a water inlet pipeline is arranged at the bottom end of the slanting board sedimentation pool, the top end of the slanting board sedimentation pool communicates with the water distribution area, the water collection area is equipped with a water outlet pipeline, and a return pipeline is arranged between the water collection area and the water distribution area, so that part of treated water is conveyed back to the water distribution area through the return pipeline. Compared with the prior art, the turbidity and the content of soluble COD, nitrogen and phosphorus in water can be reduced simultaneously, an A/O biological contact oxidation technology and an adsorption phosphorous removal technology are combined creatively to be applied to the field of seawater treatment, and the problem about large-scale purified emission of mariculture wastewater is solved.

The invention relates to a normal-temperature low-C/N-ratio sewage continuous shortcut nitrification starting method, and belongs to the sewage treatment and regeneration field. The method comprises the following steps: dividing the aerobic zone of an A<2>O reactor into three segments comprising an aerobic segment 1, an aerobic segment 2 and an aerobic segment 3 along a water flow direction, and refluxing a nitrification liquid to an anoxic zone from the aerobic segment 3; and inoculating nitrated sludge into the reactor until the concentration of sludge in the reactor is 2.5-3g/L, rapidly elutriating nitrite oxidation bacteria (NOB) with continuous flow short-sludge-age water at a water temperature of 23-25DEG C, screening ammonia-oxidizing bacteria (AOB), adding a cylindrical polypropylene suspension filler into an aerobic zone, recovering the long sludge age, reducing the dissolved oxygen concentration of the aerobic zone, and maintaining the above conditions until the mass concentration of ammonia nitrogen in water discharged from the A<2>O reactor decreases to below 2mg/L and the nitrosification rate stably maintains above 80% in order to complete the continuous shortcut nitrification starting. The starting method realizes the advanced treatment of the N element through shortcut nitrification denitrification, and is simple and feasible.

The invention belongs to the field of microbial fermentation and specifically relates to a high-density enriching method of an autotrophic nitrifying bacterial consortium and application of the obtained autotrophic nitrifying bacterial consortium to sewage treatment. The high-density enriching method of the autotrophic nitrifying bacterial consortium comprises the steps of inoculating thalli in anautotrophic nitrifying bacteria initial culture medium; culturing the thalli under a stirring condition by controlling the dissolved oxygen (DO) at 20-40%, at the temperature of 28-32 DEG C and the pH value of 7.5-8.0; according to a relation between NO3-N cumulated amount and inorganic carbon source consumption in the culturing process, monitoring the change of pH value in the culturing processby a pH electrode to supplement an inorganic nitrogen source and the inorganic carbon source to a culture system, and controlling the ammonia nitrogen concentration in the culturing process at 150-300mg/L; and enabling the pH value of the system to be 7.5-8.0 by the supplemented carbon source to further realize high-density automatic propagation of the autotrophic nitrifying bacterial consortium.The high-density enriching method of the autotrophic nitrifying bacterial consortium, provided by the invention, has the advantage that a problem of the consortium of poor ammonia-nitrogen treating effect caused by reasons, such as poor strain adaptation ability, added strain loss, insufficient added strain number and high cost, in the ammonia-nitrogen waste water treatment application process iseffectively solved.

The invention relates to an artificial oxygen increasing type combined subsurface flow wetland sewage purification technique, belonging to the field of water pollution control; aiming at the defects of artificial wetlands such as easy blockage, low purification capability and large seasonal fluctuation, a sewage purification technique which includes a biological strengthening sedimentation tank, a micro aeration vertical flow wetland and a subsurface horizontal-flow wetland is developed. The biological strengthening sedimentation tank can reduce the concentration of suspended substances, and the micro aeration vertical flow wetland can improve oxidative decomposition and nitrification effect of organic matter, can reduce the organic residue in a wetland system to the maximum extent and prolong the service life of the wetland. The subsurface horizontal-flow wetland can create an anoxia-anaerobic environment for the effluent of the micro aeration vertical flow; therefore, denitrification can be carried out more completely. The technique is applicable to the treatment of the domestic sewage from villages, small towns and scenic spots and the sewage entering lakes and rivers which is mixed with urban domestic sewage, and the deep purification of the tail water of sewage treatment plants.

This invention discloses a method and a device for the treatment of urban domestic sewage by composite vertical current constructed wetlands. The method connects two levels of vertical upstream current constructed wetlands in series for the treatment of urban domestic sewage; firstly, the urban domestic sewage enters a primary sedimentation tank, and enters a level I vertical upstream current constructed wetland and a level II vertical upstream current constructed wetland in sequence after pre-sedimentation; the ultimate effluent can be used for agricultural irrigation or be discharged into rivers. The invention, which connects the two levels vertical upstream currents in series for the treatment of urban domestic sewage, are characterized by powerful detergency, strong nitrification and denitrification capacity, little water potential loss and low energy-consumption requirement; accordingly, the required falls of water between the pretreatment tank and the level I constructed wetland and between the two levels of constructed wetlands are small. The method of the invention can utilize the composite vertical upstream currents to efficiently improve the resistance to the external temperature impact and keep satisfactory effect of removing contaminants in winter. The device is simple in structure, which is helpful for large-scale promotion.

The invention discloses a combined drop-driven biological rotating disk reactor which comprises a tank body (1), wherein the tank body (1) comprises a rotating disk region (2) and a drive region (3); a rotating disk (201) is arranged in the rotating disk region (2) through a rotating shaft (6); a drive disk (301) for driving the rotating disk (201) to rotate is arranged in the drive region (3); the liquid level of the drive region (3) is arranged below the drive disk (301); the bottom of the drive region (3) is provided with an auxiliary filler oxidation region (302) for degrading the sewage; and the front end of the auxiliary filler oxidation region (302) is provided with a water outlet tank (303) for controlling the liquid level of the drive region (3). By adopting the drive disk and rotating disk function division, the liquid level of the drive region is on the bottom of the drive disk, thereby eliminating the resistance of water to the drive unit, enhancing the rotation speed of the rotating disk, and obviously enhancing the oxygenation rate. The auxiliary oxidation filler region is utilized to reinforce the removal of organic substances in the sewage, thereby being beneficial to enhancing the nitrification properties of the reactor.

The invention discloses a method for upgrading an expansion biochemical pool on the basis of MBBR technology and belongs to the field of sewage treatment. The expansion biochemical pool comprises an anaerobic zone, an MBBR mud film anoxic zone, an MBBR mud film aerobic zone and a decanting water draining zone, wherein a water feeding hole is formed in the anaerobic zone; the anaerobic zone communicates with the MBBR mud film anoxic zone through a through hole at the bottom of a first zone separating wall; a suspension carrier is added into the MBBR mud film anoxic zone; another suspension carrier is added into the MBBR film mud aerobic zone; the MBBR mud film aerobic zone communicates with the MBBR mud film anoxic zone through a front intercepting screen; a penetrated aerator pipe is arranged in the MBBR mud film aerobic zone; the MBBR mud film aerobic zone communicates with the decanting water draining zone through a rear intercepting screen; the decanting water draining zone communicates with the anaerobic zone and the MBBR mud film anoxic zone through a water draining pipeline of a nitration liquid reflux pump. According to the invention, on the basis of keeping the running modeof an original CAST biochemical pool, the MBBR technology is adopted for rezoning transformation, so that the nitrogen and phosphorus removal capacity of the original CAST biochemical pool is promoted.

The invention relates to activated sludge for treating crushed coal gasification wastewater and a culturing domestication method and application of the activated sludge. The culturing domestication method comprises the following steps that 1, a culture solution is added into an A/O tank, the activated sludge is put into the culture solution for closed aeration, and the activated sludge is culturedthrough intermittent aeration; 2, the activated sludge obtained after being cultured through intermittent aeration in the step 1 is domesticated through intermittent aeration; 3, the activated sludgeobtained after being domesticated through intermittent aeration in the step 2 is domesticated through continuous aeration. The activated sludge cultured and domesticated by using the method has gooddegrading effects on CODcr, ammonia nitrogen and total phenols, wherein the removal rate of the CODcr is up to 93.5%, the removal rate of the NH3-N is up to 98.3%, and the removal rate of the total phenols is up to 93%.

The invention discloses a low-carbon source two-stage MBR (Membrane-Bioreactor) enhanced nitrogen and phosphorus removal method for city sewage. The method is characterized by being a continuous flow nitrogen and phosphorus removal process with an adjusting tank, an anaerobic tank, a settling pond I, an aerobiotic MBR tank I, an anoxic pond, a settling pond II and an aerobiotic MBR tank II which are connected in series. The method comprises the following steps: firstly, feeding sewage into the anaerobic tank for anaerobic phosphorus release, further feeding the sewage into the settling pond I for sludge-water separation, feeding supernate obtained after settling into the aerobiotic MBR tank I for nitration and degradation of a part of organic matters, feeding settled sludge and a nitration liquid after aerobiotic nitration into the anoxic pond for denitrification phosphorus removal, feeding a part of a mixed liquid after anoxia into the settling pond II for settling sludge removal so as to remove phosphorus, feeding another part of the mixed liquid and the supernate of the settling pond II into the aerobiotic MBR tank II for further aerobiotic nitration and phosphorus removal, and finally filtering and discharging water by using an MBR membrane component. Due to two stages of aerobiotic MBRs, complete separation of nitration bacteria and phosphorus-accumulating bacteria can be achieved, the nitrogen and phosphorus removal effect can be improved, the process is simple in procedure and convenient to operate, and continuous water discharge can be achieved.

The invention provides suspended filler used for sewage treatment and a preparation method thereof. The preparation method comprises the following steps: (1) uniformly mixing the following componentsin parts by mass: 4-10 parts of activated carbon powder, 8-11 parts of reclaimed rubber powder, 1-3 parts of purified diatomite, 1-7 parts of maleic anhydride, 0.3-0.9 part of dicumyl peroxide and 0.5-2 parts of biological enzyme, then adding 75-80 parts of high-density polyethylene, and stirring at a high speed; (2) adding the mixed materials into a suspended filler mold, and molding; (3) settingthe molded suspended filler, cooling, carrying out mechanical perforation, and cutting by virtue of a gear; and (4) finally adding a silk-like fiber carrier at the center. The suspended filler provided by the invention has the advantages that enhancement ingredients are added for biological enzyme, hydrophilic modification is carried out, catalytic action of the biological enzyme and nitrification of nitrifying bacteria are promoted, and hydrophilic performance of the filler and nitrification ability of the nitrifying bacteria are improved, so that microorganisms can be adsorbed on the fillereasily, and capabilities of the microorganisms in decomposition on pollutants in water and removal of ammonia nitrogen are obviously improved.