132results about How to "Improve total nitrogen removal rate" patented technology

The invention provides a culture method of salt-tolerant anaerobic ammonium oxidation bacteria, which comprises the following steps of: A, enrichment culture: performing enrichment culture on the strain to obtain anaerobic ammonium oxidation bacteria; and B, bacteria acclimation culture: gradually increasing the concentration of salt in the culture solution to perform salt tolerance acclimation culture of the anaerobic ammonium oxidation bacteria subjected to the enrichment culture in the step A, wherein the acclimation period of the bacterial at each salt concentration is 15-30 days; and the step A and step B both adopt sequencing batch culture, and the dissolved oxygen value in the culture solution is 0-0.5mg/L. The bacteria cultured by the method provided by the invention are applied to high-salt ammonia nitrogen wastewater, and the total nitrogen removal rate is high. By adopting the method provided by the invention to culture the salt-tolerant anaerobic ammonium oxidation bacteria, the range of available substrates is wide, and the culture is easy to implement; and additional organic carbon source is not required in the bacteria culture and application process, investment is greatly saved, and the wastewater treatment cost is reduced. The bacteria culture method provided by the invention can be applied to large-scale production, and has good economic and environmental benefits.

The invention discloses a wastewater treatment method that combines a novel high-efficiency full-range coupling with autotrophic denitrification. Aiming at the incomplete removal of total nitrogen caused by the relatively insufficient carbon source of ammonia-nitrogen wastewater in the current traditional biological denitrification process, the domesticated short-range nitrification and anammox sludge were inoculated in the SBR reactor at a ratio of 3:5 to Ammonia nitrogen wastewater with a concentration of about 200~900mg/L is the test influent, and the commissioning operation is carried out under the condition of not adding organic carbon source. After the system was running stably, elemental sulfur was added, and after 15 days of domestication, sulfur autotrophic denitrification was successfully coupled to the system, and the total nitrogen removal rate was stable above 99%. The invention has the beneficial effects of utilizing the coupling action of short-range nitrification, anaerobic ammonium oxidation and sulfur autotrophic denitrification to realize the standard-reaching treatment of total nitrogen in a single reactor under the condition of no organic carbon source.

The invention relates to a method for starting and stably keeping the micro-expansion of sludge in a synchronous biological nitrogen and phosphorus removal system, belonging to the field of treating sewage biochemically. A device for implementing the method is formed by connecting a water inlet pool, anaerobic cells, hypoxic cells, aerobic cells and a secondary settling pool in sequence. The wall of the secondary settling pool is provided with a sludge height mark so that the degree of expansion of the sludge can be known in real time. Each aerobic cell is provided with an independent dissolved-oxygen probe, and the dissolved-oxygen probe is connected with a dissolved-oxygen instrument. The control platform of a PLC (programmable logic controller) is used for controlling the concentration of the dissolved oxygen in each aerobic cell accurately according to the parameter set value and the feedback signal of the dissolved-oxygen instrument. The micro-expansion of the sludge in the synchronous biological nitrogen and phosphorus removal system is started by reducing the concentration of the dissolved oxygen in each aerobic cell to 0.8-1.0 mg/L, and the dissolved oxygen is regulated according to monitoring result of the SVI (sludge volume index), the height of the sludge in the secondary settling pool, the quality of the effluent of the device and other parameters so as to keep the micro-expansion of the sludge stable. Due to the adoption of the method, the pollutant removal rate is improved, the quality of the effluent is guaranteed, the aeration energy consumption of the water plant is reduced, and the energy-efficient treatment of the effluent is realized.

The invention discloses a device for strengthening anaerobic ammonia oxidation and nitrogen removal process. The device comprises a raw-water storage tank, a feed pump, a biochemical reactor and a continuous flow reactor of a sediment tank; the continuous flow reactor is connected with a PLC (programmable logic controller); the biochemical reactor contains an anaerobic zone, an aerobic zone and an anoxic zone; the urban raw-material storage tank is communicated with a water inlet pipe of the biochemical reactor through the feed pump, and sewage is sequentially connected with the anaerobic zone, the aerobic zone, the anoxic zone and the sediment tank through the water inlet pipe; the sediment tank is subjected to sludge and water separation, and a supernatant is discharged as yielding water; in the anaerobic zone, activated sludge absorbs an organic matter synthesized internal carbon source degraded into the water; in the aerobic zone, coupling of short-cut nitrogen removal and anaerobic ammonium oxidation is realized by controlling dissolved oxygen, and nitrogen removal rate of the system is increased.

The invention discloses a method for enhancing the biological denitrogenation effect of constructed wetland. According to the invention, a carbon source slow-release apparatus is arranged at a front end of the constructed wetland, sewage passes through the carbon source slow-release apparatus, and then is introduced into the constructed wetland; the external part of the carbon source slow-release apparatus is formed by a netted framework structure, and the agricultural waste is provided in the internal part of the carbon source slow-release apparatus. The agricultural waste is placed at the front end of the constructed wetland, by controlling the adding rate of the agricultural waste and blending ratio, the slow release effect of the agricultural waste is used for providing a carbon source for denitrification and nitrogen removal for the constructed wetland, so that the total nitrogen removing rate of the constructed wetland is increased.

The invention provides an SBR (sequencing batch reactor) semi-short-distance nitrification process control method, belonging to the technical field of biological sewage treatment and being applicable to semi-short-distance nitrification treatment of low-ammonia-nitrogen wastewater such as urban domestic sewage. The SBR semi-short-distance nitrification process control method comprises five stages, namely inflow stirring and inputting of initial ammonia concentration, aeration stirring, sedimentation, dewatering and standing, wherein an aerobic aeration time is calculated according to a formula ta=tCOD+0.56alphaS0/((S0-Sn)/(n-tCOD)), aeration is timely stopped, and semi-short-distance nitrification is realized, wherein concentration ratio of nitrite ions to ammonia nitrogen in yielding water is maintained to be 0.9-1.5; and process management and operation are easy, and impact resisting load of s system is high. Compared with the traditional SBR process control technique, a semi-short-distance nitrification reactor can maintain high nitrite accumulation rate more stably; and the problem that the concentration ratio of the nitrite ions to the ammonia nitrogen in the yielding water of semi-short-distance nitrification can not be controlled in a domestic sewage biological treatment technology is solved, and a necessary inflow guarantee is provided for stable operation of an autotrophic denitrification system in the urban sewage low-ammonia-nitrogen wastewater.

The invention provides a device and a method for biological denitrification of landfill leachate through SBR (Sequencing Batch Reactor) short-cut nitrification-SBBR anaerobic ammonia oxidation combined process (Sequencing Batch Biofilm Reactor), belongs to the technical field of biological denitrification, and is applicable to waste water with high ammonia nitrogen and a low carbon nitrogen ratio (C/N). The device provided by the invention is provided with SBR and SBBR. The SBR reactor is mainly used for a short-cut nitrification reaction, and hereinafter referred to as SBRSBNR; the SBBR reactor is mainly used for an anaerobic ammonia oxidation reaction, and hereinafter referred to as SBBRANAMMOX. The raw liquor of the leachate is mixed with SBBRANAMMOX effluent reflux at first and then fed into the SBRSBNR for denitrification; the raw liquor of the leachate can be diluted, and partial nitric nitrogen in water also can be removed by taking full advantage of the carbon source in the raw water. Next, the effluent of the SBRSBNR is further mixed with the raw liquor of the leachate, and fed into the SBBRANAMMOX for an anaerobic ammonia oxidation-denitrification synchronous denitrification reaction; consequently, synchronous removal of nitrogen and COD (Chemical Oxygen Demand) is realized. The system removal rate of COD is 91%, the removal rate of TN is greater than 97.5%, and the total nitrogen load of the SBBRANAMMOX is about 0.7 Kg TN/m<3>.

The invention discloses a method for treating rubbish percolates of different times for deep denitrification by using a bipolar USAB+A/O+SBR process, which belongs to the technical field of biological denitrification and is suitable for performing advanced treatment on the rubbish percolates. In the method, water output by an A/O reactor passes through a secondary sedimentation tank, then part of the water flows back into a first-stage UASB reactor to perform denitrification, so the method fully uses sufficient carbon sources of raw water, realizes an efficient denitrification efficiency, and fully uses the characteristic that the rubbish percolates contain high-concentration organic substances. Dissolved oxygen (DO), an oxidation-reduction potential (ORP) and a pH value sensor are used for monitoring the degradation and the short-range nitrification/denitrification processes of the organic substances in the reactor, and the short-range nitrification/denitrification processes can be well controlled according to monitored pH values and ORP values. The average ammonia nitrogen concentration of final yielding water is 2 mg/L, the total nitrogen concentration is lower than 40 mg/L, and the ammonia nitrogen removal rate and the total nitrogen removal rate are above 98 percent. The method completely depends on biological treatments, reduces the cost and simplifies the process. The method performs denitrification on the rubbish percolates, not only realizes complete nitrification but also realizes short-range nitrification, and realizes the deep removal of the nitrogen in the rubbish percolates.

The invention relates to an energy-saving enhanced nitrogen removal process, sewage sequentially passes through an anaerobic zone, a multi-stage aerobic-anoxic zone and a last-stage aerobic zone to complete the biological treatment process, and mud-water separation is completed in a secondary sedimentation tank. The multi-stage aerobic-anoxic zone comprises at least two stages, and each stage comprises an aerobic section and an anoxic section which are sequentially arranged. Outlet water after passing the anaerobic zone for anaerobic fermentation, one part directly enters into the first-stage aerobic section in the multi-stage aerobic-anoxic zone, and the other part respectively enters into the front ends of all stages of the anoxic sections in the multi-stage aerobic-anoxic zone by diversion through an open channel. The outlet water from the multi-stage aerobic-anoxic zone completely passes through the last-stage aerobic zone and enters into the secondary sedimentation tank for sedimentation, clear solution is discharged, one part of sediment is discharge, and the other part flows back into the anaerobic zone. The energy-saving enhanced nitrogen removal process has the characteristics of leading the denitrification reaction rate to be fast, shortening the reaction time, saving equipment required in the process and saving energy.

The invention discloses a sewage treatment technique for a membrane bioreactor, which can improve denitrification effect. The technique includes the steps that raw water enters an anoxic zone of a reactor; mixed liquid in the anoxic zone is sent to a simultaneous nitrification and denitrification (SND) zone in the reactor by a pump for the SND reaction; part of the mixed liquid in the SND zone is sent to a membrane zone, which is provided with a membrane component, of the reactor by a first overflow port while part of the mixed liquid returns to a facultative zone of the reactor by a siphon with a flowmeter; part of the mixed liquid in the membrane zone of the reactor is discharged after the filtering and purifying by the membrane component and part of the mixed liquid in the membrane zone returns to a facultative zone of the reactor by a second overflow port; the mixed liquid entering the facultative zone releases dissolved oxygen in the zone and then enters the anoxic zone by a third overflow port arranged in the facultative zone for the denitrification reaction. The technique has the advantages of improving the total nitrogen removal rate and the denitrification efficiency and saving the energy.

The invention discloses an environment-friendly microalgae cultivating method, and belongs to the field of environmental engineering and microalgae biotechnologies. The method is capable of using CO2in different concentrations as a carbon source of chlorella growth, adding the CO2 to sludge dehydrated liquid, and improving a biomass of chlorella. The method has the advantages of using a flue gasCO2 as the carbon source which is added into the sludge dehydrated liquid for cultivating the chlorella, generating a biomass energy and recycling nitrogen and phosphorus in sewage at the same time, and reducing the cost of sewage treatment. The environmental benefit and the economic benefit are realized simultaneously. In addition, the chlorella absorbs and uses the CO2, the setting treatment cost of the CO2 is reduced, and other nitrogen-phosphorus and carbon sources cannot be added in a cultivation process so as to obtain the considerable biomass.

The invention relates to a city sewage anaerobic ammoxidation autotrophic nitrogen removal apparatus based on granular sludge and a method thereof, which belong to the technical field of sewage biological treatment. The apparatus comprises a city sewage raw water tank, a nitrogen removal reactor and an on-line control system. The city sewage is introduced into a nitrogen removal reactor through a water inlet pump from the raw water tank, anaerobic operation is firstly carried out, an organic matter in sewage is converted to an internal carbon source and is stored in microbial biomass; then the material is introduced into a low-oxygen operation phase, the dissolved oxygen concentration is controlled to 0.2-0.5 mg/L, a short-range nitrifying anaerobic ammoxidation reaction is generated; when the dissolved oxygen concentration in the reactor is increased to 1.0 mg/L, aeration is completed, the material is introduced into an anoxic phase, endogenous denitrification coupling anaerobic ammoxidation is generated; short-time deposition is carried out, then granular sludge is formed through sedimentation, and finally draining is carried out for completing periodic operation. The method has the advantages of low total nitrogen concentration of an effluent, low energy consumption and stable operation.

The invention discloses a distributed water feeding type multistage-AO series-connection efficient biological denitrification system and method. According to the method, an anoxic reaction tank and anaerobic reaction tank are used as one stage, two stages or three stages are connected in series in total, nitrification liquid flows back to the anoxic tank of each stage from the aerobic tank of thecorresponding stage in an airlift mode, the backflow ratios of the stages decrease stage by stage, raw sewage flows into the anoxic tanks of the stages in a distributed manner, and the distributed flow also decreases stage by stage. Compared with an existing AN/O denitrification process, the method provided by the invention has the advantages of simpler process flow, lower energy consumption andhigher total nitrogen removal rate, and is suitable for treating sewage with sufficient carbon sources and occasions with higher requirements on the total nitrogen removal rate.

The invention discloses an aerobic denitrification strain and an application thereof. The aerobic denitrification strain is named as XPS-1 and collected in a China general microbiological culture collection center at NO. 3, yard 1, Beichen west road, Chaoyang district, Beijing, the collection date is September 29, 2017, and the collection number is CGMCC NO. 14772. The invention further provides an application of the aerobic denitrification strain to nitrogen removal for domestic sewage treatment. Efficient denitrification of the aerobic denitrification strain can be performed at a low carbon-nitrogen ratio and at the temperature of 25-30 DEG C, the aerobic denitrification strain is particularly applicable to nitrogen removal in the treatment process of urban domestic sewage with low carbon-nitrogen ratio and a certain salinity, the nitrogen removal rate can reach up to 100%, the nitrogen removal speed is high and effective, and the aerobic denitrification strain has a wide applicationprospect in the field of sewage treatment.

The invention relates to a combined denitrification method and device for sludge thermal hydrolysis anaerobic digestion biogas slurry. The device comprises a regulation and storage tank, a nitrosationreactor, an intermediate water storage tank and an anaerobic ammonia oxidation reactor; the pH and alkalinity value of the sludge thermal hydrolysis anaerobic digestion biogas slurry entering the regulation and storage tank are adjusted, then the thermal hydrolysis biogas slurry enters the nitrosation reactor to achieve partial nitrosation, ammonia nitrogen in the biogas slurry is oxidized into nitrate nitrogen in a certain proportion, and at the same time, easily degradable organic substances are removed; then, the biogas slurry enters the intermediate water storage tank, and the ratio of nitrate nitrogen to ammonia nitrogen, pH and alkalinity of the biogas slurry are adjusted; finally, adjusted effluent enters the anaerobic ammonium oxidation reactor to remove nitrogen in the biogas slurry. Compared with the prior art, the method and the device have the advantages that the ammonia nitrogen removal rate is high and most of the easily degradable organic substances are removed.

The invention discloses a culture system of function strengthened microbe and a directional concentration method. The culture system comprises a nitrous acid bacterium culture bioreactor, a moving bed adsorption filtering apparatus coupled with the nitrous acid bacterium culture bioreactor, a denitrifying bacterium culture bioreactor and a moving bed adsorption filtering apparatus coupled with the denitrifying bacterium culture bioreactor; the moving bed adsorption filtering apparatuses recover microbial thalli brought out by corresponding bioreactors, and the recovered microbial thalli can be recycled to corresponding bioreactor or be discharged for sale or applied to a correlative sewage disposal system according to requirements. Compared with a prior art, the method of the invention can concentrate two thalli at one time and enhance microbial cultivation quality while reducing production energy consumption. The invention also has advantages of convenient operation, low energy consumption, saved cost and momentarily elution and collection of thalli, etc.

The invention discloses a treatment process of a membrane bioreactor in nondegradable industrial wastewater, which comprises the following two stages: 1, continuous water feeding/discharge and aeration stage: while aerating, continuously feeding water into the membrane bioreactor and continuously pumping water, and entering the next stage after operating for a period of time; and 2, anaerobic stage: stopping feeding and discharging water and aerating so that the active sludge is in the anaerobic condition, and repeating the first stage after operating for a period of time. The treatment process can be used to enhance the treatment efficiency for high-concentration nondegradable wastewater, such as dyeing plant wastewater, factory finishing wastewater and the like, and increase the removalrate of total nitrogen, so that the quality of the discharged water can reach the standard for circulating cooling water, thereby converting sewage into resources.

The invention discloses a preparation method for a biochar immobilized microbial filler. The preparation method comprises the steps of biochar firing, microbial domestication and microbial immobilization. The preparation method specifically comprises the following steps: domesticating microorganisms for sewage treatment by adopting filler used in an artificial rapid infiltration system; adsorbingthe domesticated microorganisms by adopting biochar and preparing to obtain the biochar immobilized microbial filler; finally, mixing the biochar immobilized microbial filler with natural river sand according to the mass ratio of 1-6 to 1-8, and preparing to obtain the biochar immobilized microbial filler with a better sewage treatment effect. The invention also discloses a rapid infiltration system for the biochar immobilized microbial filler; the rapid infiltration system comprises a distributing reservoir, a lifting pump, a water distributing system and an infiltration column; the inner part of the infiltration column is filled with the biochar immobilized microbial filler. The preparation method disclosed by the invention overcomes the defect of low total nitrogen removal rate of a CRIsystem by using good properties of the biochar and efficient nitrogen removal effect of the microorganisms.

The invention provides a multi-unit modified sequencing batch reactor and an application thereof. The multi-unit modified sequencing batch reactor comprises an anaerobic reaction unit, a first anoxic reaction unit, a slurry separation unit, an aerobic unit, a first order batch unit and a second order batch unit, and the multi-unit modified sequencing batch reactor also comprises a pre-anoxic unit, a second anoxic reaction unit, a first anoxic/aerobic reaction unit and a second anoxic/aerobic reaction unit. The multi-unit modified sequencing batch reactor can fully utilize carbon sources in raw water and improve the removal rate of total nitrogen, is especially suitable for treating waste water with low carbon-nitrogen ratio, and can also be used for treating waste water with high carbon-nitrogen ratio.