285 results about "Simultaneous nitrification-denitrification" patented technology

Disclosed is a comprehensive treatment method of livestock and poultry breeding wastewater, which adopts the following three steps that: firstly, an upflow anaerobic sludge blanket treater (3) is used for anaerobic biological treatment and killing bacteria and viruses. Secondly, an improved moving bed biomembrane treater (6) is used for aerobic biological treatment, a longitudinal clapboard (12) is added into the treater (6) to partition the treater into an aerobic zone (13) and a solid-liquid separation zone (10), an air pump (7) is used for increasing oxygen while guiding the sewage, and a simultaneous nitrification and denitrification method is used to remove total nitrogen (TN) and decompose organics under the action of microorganisms. Thirdly, a chemical reaction method is adopted to remove P and N in the sewage, after the former two steps of treatment, mass P and N with a certain amount still exist in the sewage, liquid magnesium oxide is again added for generating magnesium ammonium phosphate precipitates, and the supernatant is discharged when reaching the standards. The method has advantages of speediness, land saving, energy saving, complete material transfer, small influence under external conditions and good purification effects when treating wastewater.

The invention discloses a pseudomonas sp. strain capable of carrying out biological denitrification under a low temperature and an application thereof. The pseudomonas sp. strain HA11 provided by the invention was collected in the China General Microbiological Culture Collection Center (CGMCC) on September 15, 2010, with the collection number of CGMCC No.4169. At the temperature of 10-20 DEG C, the strain can carry out biological denitrification as long as the strain is put into the nitrogenous wastewater with dissolved oxygen of 2-6mg/L. The strain has the following beneficial effects: the strain has strong tolerance to low temperature, can grow well under a low temperature and simultaneously has the capabilities of heterotrophic nitrification and aerobic denitrification; and the strain can carry out nitrification and denitrification synchronously under low temperature and aerobic conditions to efficiently and thoroughly remove the total nitrogen in the sewage, thus effectively solving the great difficulty in carrying out biological denitrification under a low temperature and having a good application prospect.

The invention discloses a method for treating ammonia containing wastewater through simultaneous nitrification and denitrification. The method comprises the following steps: firstly, cultivating denitrifying granular sludge; and secondly, using the denitrifying granular sludge to treat ammonia containing wastewater through simultaneous nitrification and denitrification. The cultivating method of the denitrifying granular sludge comprises the following steps: firstly, inoculating seed sludge in an aerobic reactor, and performing accumulation culture to the aerobic sludge with high ammonia-nitrogen and low chemical oxygen demand (COD) wastewater; secondly, separating and screening aerobic denitrifying bacteria to perform domestication and cultivation; and thirdly, inoculating the domesticated and cultivated aerobic denitrifying bacteria in the denitrifying granular sludge to cultivate and obtain the finished denitrifying granular sludge. The invention adopts the domesticated and cultivated simultaneous nitrification and denitrification sludge treatment catalyst to treat ammonia containing wastewater, and has the characteristics of high removal rate of contaminants, low energy consumption and material consumption and the like; and nitrification and denitrification can be completed in the same reactor, and the short-range simultaneous nitrification and denitrification technology can be applied in actual wastewater treatment.

A process for treating nitrogenous wastewater contains an autotrophic denitrification reaction, a heterotrophic denitrification reaction and a COD removal reaction simultaneously and mixedly taking place in a single reactor. The nitrification reaction is caused by nitrifying bacteria, in which ammonium is oxidized into nitrite. The autotrophic denitrification reaction is caused by autotrophic denitrifying bacteria, in which ammonium used as electron donor and nitrite used as electron acceptor are converted into nitrogen gas and nitrate. The heterotrophic denitrification reaction is caused by heterotrophic denitrifying bacteria, in which nitrate and COD are consumed. It is not necessary to build two separate reactors for aerobic nitrification and anaerobic denitrification, thereby effectively reducing the fabrication and operation cost.

The invention discloses an oxidation channel intelligent control system, which bases on the digging water change and belongs to the water pollution controlling technical field in the environmental protection. The system consists of a digging-water monitoring system, an operation decision support system, a control system and a process on-line monitoring system. According to the dynamic change of the digging water, the system timely monitors the change and collects dynamic data information into the decision support system. Through the simulation analysis of the decision support system, corresponding suitable operation conditions and control strategies are generated. The running state of the system is determined. Then, the process operation is regulated through the controlling system. And system operation parameters are monitored by on-line monitoring equipments and are fed back to the control system and the operation decision system. The feedback verification and the decision correctionare implemented on the system running strategies to guarantee the successful application of the simultaneous nitrification and denitrification of the oxidation channel process. Both the application of the advanced technology in the sewage treatment process is guaranteed and great energy saving and consumption reduction are realized. The larger treatment potentiality of water plants is exploited.

The invention relates to a synchronous nitrogen and phosphorus-removal domestic sewage treatment process of an integral bio-enhancement activated carbon dynamic membrane. The solid-liquid separation effluent process is completed by a dynamic membrane module. The domestic sewage treatment process comprises the following steps: pumping sewage into a bio-enhancement activated carbon dynamic membrane device, and carrying out biodegradation and removal on pollutants by utilizing a bio-enhancement activated carbon mixed liquor in the device; forming a dynamic membrane on the surface of the dynamic membrane module by the bio-enhancement activated carbon to carry out the solid-liquid separation of the mixed liquor; stirring raw water by a stirrer and sufficiently mixing the raw water with microorganisms in the reaction device of the bio-enhancement activated carbon dynamic membrane assembly, staying for a period of time and then filtering and discharging water through the dynamic membrane, wherein dissolved oxygen in the mixed liquor is provided by the aeration of an air blower. The invention has simple process and can realize a synchronous nitrification-denitrification nitrogen removal process and a nitrification phosphorus removal process; the structure of the adopted dynamic membrane assembly is stainless steel silk screen and the like, and therefore, the domestic sewage treatment process has low cost and simple control; and the domestic sewage treatment process can rapidly and effectively remove substances in the water, such as organic matter, SS (suspended substances), nitrogen, phosphorus and the like under the condition of low temperature; the hydraulic retention time is short, and thereby, the volume of reaction structures is effectively reduced.

The invention relates to the treatment of industrial wastewater and domestic sewage containing nitrogen, in particular a membrane bioreactor (MBR) which can realize the function of synchronous nitrogen removal of nitrification and denitrification. The reactor comprises a reactor cylinder, a membrane component, spherical elastic filler, dissolved oxygen (DO) electrode, a pH electrode, a thermometer and other on-line monitoring and controlling components. A water production end on an internal membrane component of the MBR is connected with a water production pressure gauge and a vacuum pump. Except the membrane component, the inside of the MBR is also evenly provided with the spherical elastic filler which forms an integer by connecting in series from top to bottom and is fixed on the top and bottom of the reactor. The bottom of the MBR has a micropore aerator connected with an air pump for the aeration utilization of the MBR. The membrane bioreactor introduces the porous spherical elastic filler into the MBR and regulates the micro-environment inside the MBR, so as to realize the function of synchronous nitrogen removal of nitrification and denitrification. The membrane bioreactor has small land occupancy and simple operation, saves energy consumption, can remove a plurality of pollutants of organic matters, ammonia nitrogen, etc., and is applicable to the treatment of industrial organic wastewater, domestic sewage, etc.

The invention relates to a device and method for treating low-carbon domestic sewage through single-stage SBBR short-range synchronous nitration, denitration and dephosphorization coupled anaerobic ammonia oxidation and belongs to the field of biological sewage treatment. The domestic sewage enters a short-range synchronous nitration, denitration and dephosphorization coupled anaerobic ammonia oxidation reactor through a water feed pump. In the short-range synchronous nitration, denitration and dephosphorization coupled anaerobic ammonia oxidation reactor, phosphorus accumulating bacteria achieve anaerobic phosphorus release by making full use of an organic carbon source in raw water; part of NH4<+>-N in the raw water is converted into NO2<->-N by ammonia oxidizing bacteria, one part of the NO2<->-N and the NH4<+>-N remaining in the raw water are subjected to an anaerobic ammonia oxidation action so as to achieve autotrophic denitrification, and the other part of NO2<->-N and a small amount of NO3<->-N resulting from the anaerobic ammonia oxidation action are utilized by denitration phosphorus accumulating bacteria so as to achieve synchronous deep denitrification and dephosphorization. According to the method, short-range nitration, anaerobic ammonia oxidation and denitration dephosphorization are applied to the biological treatment on the domestic sewage in a coupled manner, so that the synchronous deep denitrification and dephosphorization of the domestic sewage can be achieved on the basis of saving energy and making full use of the carbon source.

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

The invention relates to a heterotrophic nitrification-aerobic denitrification compound bacterial agent for low-temperature high ammonia-nitrogen removal and application. The compound bacterial agentis formed by compounding of 10-20% of cupriavidus SWA1, 5-20% of alcaligenes faecalis, 10-30% of acinetobacter and 20-50% of ochrobacterum TAC-2. The compound bacterial agent has advantages of high ammonia-nitrogen resistance, low-temperature resistance, heavy metal resistance and synchronous nitrification and denitrification; by synergistic effects of four microorganisms, efficient denitrification of high ammonia-nitrogen wastewater can be realized in an aerobic environment under low-temperature conditions.

The invention discloses a method for treating high-content ammonia and nitrogen for shortcut nitrification to discharge effluent by coupling simultaneous denitrification of sludge fermentation with autotrophic nitrogen removal, belonging to the technical field of biochemical process sewage treatment. The high-efficiency removal of total nitrogen in wastewater and the reduction of sludge are realized in the same space by combined action of hydrolysis acidifying bacteria, denitrifying bacteria and anaerobic ammonium oxidation bacteria. The method is characterized in that part of NO2--N in effluent is reduced by short-chain fatty acid generated by hydrolytic acidification of residual sludge under the action of the denitrifying bacteria; and the other part of NO2--N and ammonia nitrogen released in the hydrolytic acidification process are removed by an anaerobic ammonia oxidation reaction, thereby greatly reducing the concentration of total nitrogen in the effluent and finishing the reduction of the residual sludge simultaneously. The technology is suitable for advanced treatment of high-content ammonia and nitrogen for shortcut nitrification to discharge the effluent.

The disclosed sewage treatment method to denitrify and recover phosphorus by a sludge external circulating composite membrane bioreactor comprises: attaching the bilmembrane on the filling; keeping the sewage in biormembrane zone for 3~5h; adjusting the micropore aerator to control the COD in biormembrane zone within 0. 5-1. 5mg/L for synchronous nitration and denitrification; letting the output water into the deposition zone with surface load as 1. 0m3/m2. h through the rectification baffle on bottom; finally, guiding 35~45% deposited sludge in bioreactor into the dephosphorization pond. Compared with prior art, this invention saves 40~60% land, has low residual sludge, reduces cost about 20%, and outputs super water for direct usage.

The invention discloses a method for denitrifying wastewater generated in the process of producing an FCC (fluid catalytic cracking) catalyst. The method comprises the step of adding nitrobacteria and nitrous acid denitrifiers to sewage, wherein the ammonia nitrogen containing sewage treatment temperature is 18-40 DEG C; the dissolved oxygen is 0.2-3mg/L; and the pH value is 7.5-8.5. The method adopts autotrophic bacteria and heterotrophic bacteria which are subjected to combination of superiority to serve as reinforced microorganisms for treating wastewater, adopts different addition modes, can achieve removal of ammonia nitrogen, total nitrogen and CODcr in the same reactor, has a good wastewater treatment effect, truly achieves short-cut nitrification and denitrification or simultaneous nitrification and denitrification of the ammonia-containing wastewater generated by producing the catalyst by being combined with high-efficiency devices, and achieves up-to-standard discharge of pollutants such as ammonia nitrogen and the like in the wastewater.

The present invention relates to an A2/O oxidation channel process synchronous nitrification and denitrification control method and its equipment, belonging to the field of domestic sewage biodenitrogenation technology. It is characterized by that said method includes the following steps: utilizing DO on-line monitoring apparatus to monitor the macroscopic aerobic-anoxic environment formed in oxidation channel aeration basin; utilizing ORP on-line monitoring apparatus to monitor the microscopic aerobic-anoxic environment formed in oxidation channel aeration basin; and utilizing computer to control frequency conversion air blower to control aeration quantity so as to ensure that the macroscopic and microscopic nitrification reaction and denitrification reaction can be simultaneously implemented.

The invention discloses a method for screening denitrifying bacterium. The method comprises the following steps: (1) performing accumulation culture process on aerobic activated sludge by using ammonia-containing sewage; (2) separating and purifying denitrifying bacterium from accumulated flora; (3) acclimatizing the growing ability of the purified denitrifying bacterium with the water containingtarget pollutant; and (4) acclimatizing the denitrification ability of the acclimatized denitrifying bacterium under different dissolved oxygen conditions. When the denitrifying bacterium screened byusing the method disclosed by the invention is applied to denitrification treatment of sewage, the denitrifying bacterium not only can overcome the shortcomings of the traditional biologic denitrification technology, but also can be replenished into the impacted sewage treatment system as bioremediation agent so as to quickly recover the treating capability of the system and provide the conditionof synchronous nitration and denitrification.

The invention discloses a whole process low-oxygen aeration SBMBBR (sequencing batch moving bed biofilm reactor) synchronous denitrification and dephosphorization method and belongs to the technical field of sewage treatment. The method achieves synchronous denitrification and dephosphorization by adding suspension filling into the traditional SBR (sequencing batch reactor) to form an SBMBBR, controlling an organic load, a nitrogen and phosphorus load and a DO (dissolved oxygen) value in the reactor, performing staged culture and acclimation on an inoculum, and performing synchronous nitrification-denitrification and denitrification-dephosphorization on enriched denitrification polyphosphate accumulating bacteria and aerobic polyphosphate accumulating bacteria and by other approaches. The method achieves the synchronous denitrification and dephosphorization for low C/N (carbon/nitrogen) ratio sewage in the same reactor under a whole process low-oxygen aeration condition, has the advantages of a simple technology, simple operational control, a high sludge load, small floor area, low energy consumption, no need of an additional carbon source, stable denitrification and dephosphorization effects and the like. The method has very practical significance in simplifying the traditional denitrification and dephosphorization sewage treatment technology, improving the denitrification and dephosphorization effects and reducing the floor area and energy consumption, and is a sewage treatment technology with good application prospects.

The invention discloses a multistage A/O (anoxic/oxic) biomembrane-sludge activation coupled denitrification and dephosphorization device and a sewage treatment method by using the device. The device comprises a raw water tank, a biomembrane region, a sedimentation tank and a sludge activation reactor. By combining a continuous-flow sectionalized water inlet biomembrane technique with a sludge activation technique, the synchronous nitrification-denitrification process is reinforced to obtain the low-carbon/nitrogen-ratio domestic sewage, thereby implementing the coupled technique with the optimized treatment effects. The speed-separation ball filler is arranged in the biomembrane region to increase the system stability, lower the sludge load, reduce the surplus sludge and enhance the treatment efficiency of the system.

The invention relates to enrichment of a low temperature-resistant heterotrophic nitrification-aerobic/anoxic denitrification microbial agent and application thereof in wastewater treatment under an anoxic condition. The microbial agent is capable of realizing simultaneous nitrification and denitrification in an aerobic or anoxic environment, in the presence of both ammonia nitrogen and nitrate, with sodium acetate as a unique organic carbon source under a 10 DEG C low-temperature condition; therefore, inorganic nitrogen in wastewater is transformed into gaseous nitrogen and removal of total nitrogen is realized. The low temperature-resistant microbial agent thoroughly realizes maintenance and stabilization of activity of aerobic nitrification and heterotrophic denitrification bacteria under the low-temperature condition, and also has a very high total nitrogen removal rate under an anoxic condition. Besides, the heterotrophic microbial agent grows quickly and lays a good foundation for quick amplification and actual application. When applied to practical town sewage treatment, the microbial agent is capable of efficiently removing total nitrogen in the low-temperature environment under the single anoxic condition; and therefore, the problem that a traditional treating plant hardly reaches the national class A emission standard of total nitrogen in winter is solved and the utilization potentiality of the microbial agent is huge.

The invention discloses a sludge reflow-free device with a simultaneous nitrification and denitrification (SND) function. The device comprises a pool body; the sidewall of the pool body is provided with a main water inlet; the interior of the pool body is divided by a clapboard into a diversion area, an aeration area and a sludge precipitation area in sequence; the aeration area is internally provided with an overflow groove; the bottom of the aeration area is provided with microporous aeration devices distributed uniformly; and the sludge precipitation area is internally provided with a membrane element. The invention also discloses an operation control method of the device. By skillful arrangement of aeration pipes and combined use with a biological membrane, the power cost and the operating cost of sludge reflow are saved, and the purpose of reducing energy consumption is achieved. The biological environment to be achieved by the simultaneous nitrification and denitrification is adjusted indirectly through adjusting parameters such as active sludge concentration, sludge age, unit sludge load and the like; the operation is strong in human controllability, and the problem that the microbial metabolic environment in the SND technology is not easy to control is solved.

The invention discloses a small brevibacterium strain capable of carrying out biological denitrification under the high-salt condition and application of the small brevibacterium strain. The small brevibacterium strain provided by the invention is preserved in China General Microbiological Culture Collection Center (CGMCC for short) on March 29th, 2012, with the preservation number of CGMCC No.5947. At the salinity (counted by NaCl) is 3-10 percent, the strain is added into nitrogen-containing wastewater with dissolved oxygen of 2-6mg/L for biological denitrification. The strain has strong resistant ability for high salinity and heterotrophic nitrification and aerobic denitrification capabilities and can better grow under the high-salinity condition. Under the high-salinity and aerobic conditions, the strain can be used for synchronous nitrification and denitrification and efficiently and thoroughly removing total nitrogen in sewage, and thus the major problem that biological denitrification is difficult to carry out under the high-salinity condition is effectively solved and a favorable application prospect is obtained.

An apparatus and a method of treating domestic wastewater by coupling low-oxygen nitration with short-cut denitrification and anaerobic ammonia oxidation. The invention belongs to the field of bio-treatment. The apparatus is mainly composed of a low-oxygen nitration reactor (SND-SBR) and an anoxic reactor (A-SBR). A part of domestic wastewater firstly flows into the SND-SBR reactor, and then synchronous nitration-denitrification effect in the system is enhanced by adding a filler, continuously feeding water and performing low-oxygen aeration; when ammonia nitrogen in the SND-SBR reactor is completely degraded, a supernatant containing low-concentration NO3-N and the rest of the domestic wastewater are pumped into the A-SBR at the same time; short-cut denitrification bacteria reduce the NO3-N into NO2-N by means of organic carbon sources in raw water, and anaerobic ammonium oxidation bacteria perform deep denitrification by means of the NO2-N and NH4<+>-N in the raw water. The apparatus and method utilize the carbon sources in raw water as most as possible and reduce treatment energy consumption, are simple and stable in operation and control, and achieve deep treatment of low C/N ratio domestic wastewater without external carbon sources.

The invention belongs to the technical field of biological engineering and environmental engineering and discloses a low-temperature aerobic denitrifying strain Pseudomonas psychrophila Den-03. The strain is suitable for growing in a neutral culture medium at the pH (potential of hydrogen) of 7.2 and at the temperature of 10 DEG C, and is characterized in that the strain is atrichous, aerobic and capable of achieving denitrification, has yellowish-white cells and can grow with nitrate nitrogen serving as energy, and both catalase and oxidase are positive. The strain obtained by screening solves the problems of low production efficiency, low denitrification efficiency in winter and the like during sewage treatment of northern cold cities, removal rate of TN (total nitrogen) in low-temperature domestic sewage reaches 74%, and on the premise of guaranteeing stable denitrification efficiency, denitrification rate of urban sewage treatment systems in winter is increased, production efficiency is improved, production energy consumption is reduced, and the stain is of great significance to realization of short-range synchronous nitrification and denitrification.

The invention discloses an acinetobacter johnsonii strain capable of carrying out biological denitrification under a low temperature and an application thereof. The acinetobacter johnsonii strain HA7 provided by the invention was collected in the China General Microbiological Culture Collection Center (CGMCC) on September 15, 2010, with the collection number of CGMCC No.4168. At the temperature of 10-20 DEG C, the strain is capable of carrying out biological denitrification as long as the strain is put into the nitrogenous wastewater with dissolved oxygen of 2-6mg/L. The strain has the following beneficial effects: the strain has strong tolerance to low temperature, can grow well under a low temperature and simultaneously has the capabilities of heterotrophic nitrification and aerobic denitrification; and the strain can carry out nitrification and denitrification synchronously under low temperature and aerobic conditions to efficiently and thoroughly remove the total nitrogen in the sewage, thus effectively solving the great difficulty in carrying out biological denitrification under a low temperature and having a good application prospect.