1167 results about "Denitrification process" patented technology

The invention relates to an agrobacterium strain (Agrobacterium sp.) with heterotrophic nitrification-aerobic denitrification capability and an application thereof in nitrogenous effluent treatment. The bacterial strain is characterized in that: 16S rRNA gene contains nucleotide sequence shown in sequence table with a sequence length of 1418bp and a accession number FJ639330 in Genbank. The preservation number thereof is CGMCC No.2962. The agrobacterium of the invention has not only heterotrophic nitrification capability but also aerobic denitrification capability. During nitrogenous effluent treatment, and one aerobic phase can cause ammonian to change into gaseous product with high denitrification efficiency and easy operation and tremendous economic benefit compared with the traditional biological denitrification process.

The invention relates to a fluidized activated carbon combined desulfurization and denitrification process, which comprises the following steps that: flue gas containing SO2 and NOx is mixed with activated carbon in a fluidized state, the temperature of the flue gas is adjusted by temperature-regulating and humidifying water, and SO2 is absorbed, oxidized and removed at the lower part of a circulating fluidized bed reaction tower; ammonia gas is injected into the upper part of the reaction tower and is reacted with NOx in the flue gas to realize the removal of the NOx; the purified flue gas passes through a gas-solid separation device which separates the activated carbon, part of the activated carbon is sent into the circulating fluidized bed reaction tower, and part of the activated carbon flows into a spiral microwave regeneration unit, so that the activated carbon is regenerated to realize the recycling of the activated carbon. The fluidized activated carbon combined desulfurization and denitrification process of the invention realizes the efficient recycling of the activated carbon and improves the reliability of a system.

The present invention relates to a wastewater treating system and method for removing pollutants of carbon, nitrogen, phosphorous, comprising: a first reactor contains methanogenic bacteria, PAO and denitrifying bacteria for eliminating the organic carbon in denitrification by denitrifying bacteria, adsorbing partial organic carbon and releasing phosphate by PAO and; metabolizing organic carbon to form methane gas by methanogenic bacteria; a second reactor disposed at the rearward of first reactor, second reactor treats the effluent from first reactor by denitrifying bacteria and PAO, denitrifying bacteria is able to denitrifying the nitrate and PAO is able to process the phosphorous releasing; a third reactor disposed rearward of second reactor, which comprises PAO, heterotrophic bacteria and nitrifying bacteria, wherein PAO is applied for phosphorous accumulating process, the heterotrophic bacteria is applied for carbon removal process, the nitrifying bacteria is applied for nitrifying process; and a membrane separation reactor disposed inside or rear of third reactor to separate various microorganisms and the treated effluent. The present invention applies methanogenic bacteria in the system for decreasing the amount of waste sludge efficiently and reduce power consuming.

The invention relates to a method of removing nitrate in aquaculture water, relating to treat aquaculture water. The invention comprises a sulfur autotrophic denitrification and biodegradation polymer carbon source heterotrophic denitrification device, the invention is characterized in that: the sulfur autotrophic denitrification section and the biodegradation polymer carbon source heterotrophic section are series-connected from up to down according to the proportion of 1:1 to form a denitrifying device; after the integrated denitrifying device forms film, the aquaculture water enters from the water inlet of the lower part of the integrated denitrifying device, and flows through the filling layer of the sulfur autotrophic denitrification section from up to down to remove partial nitrate, the remained nitrate in the aquaculture water and the sulfate anion generated in the process of the sulfur autotrophic denitrification section enter the filling layer of the biodegradation polymer carbon source heterotrophic section, so as to remove the remained nitrate in the aquaculture water and also generate gaseous nitrogen, the reducing bacteria of the sulfate reduces the sulfate anion to hydrogen sulfur; the treated aquaculture water flows out from the water outlet of the lower part of the integrated denitrifying device; the gaseous nitrogen and hydrogen sulfur are exhausted from exhaust opening.

A nitrification-denitrification process using magnetic seeding and magnetic separation to treat water is provided. The process includes biologically converting ammonia to nitrates with a biofilm disposed on magnetic seed. Suspended solids are removed by mixing flocculant and magnetic seeds with the water and magnetically removing floc formed floc from the water.

Deep desulfurization of hydrocarbon feeds containing undesired organosulfur and organonitrogen compounds to produce a hydrocarbon product having low levels of sulfur-containing and nitrogen-containing compounds, is achieved by first subjecting the entire feed to an extraction zone to separate an aromatic-rich fraction containing a substantial amount of the refractory organosulfur and organonitrogen compounds and an aromatic-lean fraction containing a substantial amount of the labile organosulfur and organonitrogen compounds. The aromatic-lean fraction is contacted with a hydrotreating catalyst in a hydrotreating reaction zone operating under mild conditions to convert the labile organosulfur and organonitrogen compounds. The aromatic-rich fraction is oxidized to convert the refractory organosulfur and organonitrogen compounds to oxidized organosulfur and organonitrogen compounds. These oxidized organosulfur and organonitrogen compounds are subsequently removed, producing a stream containing reduced levels of organosulfur and organonitrogen compounds.

The invention relates to a bacteria strain for short-cut denitrification and an application thereof. The short-cut denitrification bacteria strain is arthrobacter creatinolyticus FDN-1 and is preserved in Ordinary Microorganism Center of China Committee for Culture Collection of Microorganisms on March 11, 2010, and the preservation number is CGMCC No. 3657. The bacteria strain can directly adopt nitrite nitrogen as a substrate to complete the short-cut denitrification process. When the arthrobacter creatinolyticus FDN-1 is used for processing ammonia-contained waste water, the technique is simple, high denitrification activity can be still obtained under the condition that low-concentration organic carbon source exists, and at the same time the high-concentration organic carbon source can be withstood. When the bacteria strain is in use, the system is rapid to start, and a vast application prospect can be realized in the denitrification treatment process of different types of waste water.

The invention discloses an SCR denitrification process and a denitrification device of an ammonia injection grid adopting non-unidiameter injection orifices. Through the ammonia injection grid adopting the non-unidiameter injection orifices, the diameter size of the ammonia injection orifices is gradually reduced along with the flow direction of ammonia gas so that the quantity of ammonia gas injected by the ammonia injection orifices keeps same in the process of ammonia injection, therefore, the mixed length of ammonia gas and flue gas can not be affected, and the denitrification effect is ensured.

The present invention provides a system for removing mercury in exhaust gas, in which mercury is removed from exhaust gas of a boiler, characterized in that between a denitrification apparatus and a wet type desulfurization apparatus, an NH₃ decomposition catalyst and a mercury oxidation catalyst are provided, and mercury having been oxidized into mercury chloride is removed by the wet type desulfurization apparatus. Also, it provides a method for removing mercury in exhaust gas, characterized in that the mercury removing method includes an NH₃ decomposition process and a mercury oxidation process, which are provided between the denitrification process and a wet desulfurization process, and mercury having been oxidized into mercury chloride is removed in the wet desulfurization process.

The invention relates to a bacterial strain used for short-cut denitrification for nitrogen removal and its application. The bacterial strain used for short-cut denitrification for nitrogen removal is flavobacterium mizutaii FDN-2, which is preserved in China general microbiological culture collection center on March 11, 2012 and has a preservation number of CGMCC NO.3659. The bacterial strain can directly utilize nitrite nitrogen as a substrate to complete a short-cut denitrification process. When treating ammonia-containing wastewater with the flavobacterium mizutaii FDN-2 of the invention,the process is simple, and the flavobacterium mizutaii FDN-2 can tolerate a high concentration organic carbon source. When the flavobacterium mizutaii FDN-2 in the invention is put into use, a systemcan be rapidly initiated, so that the flavobacterium mizutaii FDN-2 boasts very broad application prospects in various nitrogen removal processes of wastewater.

The invention relates to a promoting method for selective non-catalytic reduction (SNCR) of nitrogen-oxide, which is a technological method of adding addition agent to promote the denitrification process in the SNCR denitrification process for the power plant boiler and industrial furnace and other members, belonging to the nitrogen-oxide control technical field. The invention discloses a SNCR nitrogen-oxide method with the coal dust, natural gas or syngas as addition agent, in allusion to the problem of narrow suitable temperature range and lacking retention time existing in general SNCR denitrification technical application, which is characterized in that: the denitrification reaction rate is increased; the temperature range suitable for SNCR reaction is widen; the denitrification rate is increased and the leakage of ammonia is decreased. The promoting SNCR nitrogen-oxide method has advantages that: the reform is simple; the implementing is easy; the adoptive addition agent is cheap and available; the dosage is a little, so the combust process in the furnace is not influenced and no obvious secondary pollution is brought.

The invention relates to a Kocuria palustris strain and applications thereof. The strain is Kocuria palustris FSDN-A, and is preserved in the China General Microbiological Culture Collection Center on July 14, 2011, wherein a preservation number is CGMCCNO.5061. According to the present invention, the strain can adopt nitrite nitrogen or nitrate nitrogen as a substrate to complete a denitrification process; when the Kocuria palustris FSDN-A is adopted to treat ammonia-containing wastewater, characteristics of simple process, high denitrogenation activity, and high concentration organic carbon source tolerance are provided; after the strain is poured, the system is rapidly started; and the strain has broad application prospects in wastewater denitrogenation treatment processes, and is especially suitable for treatment of wastewater containing nitrogen oxides and organic pollutants.

The invention discloses a smoke desulfurization and denitrification integration method and a special device thereof. The method is characterized in that a wet-method process is used in one technological system to simultaneously remove sulfur dioxide and nitrogen oxide in the smoke; an ammonium method is used for desulfurization, ammonia water is also used as a desulfurizer of the sulfur dioxide and a neutralizing agent for byproduct nitric acid produced in the denitrification process; an oxidization reduction method is used for the denitrification, a desulfurization byproduct ammonium sulfite or ammonium bisulfite is used as a reducing agent, urea is used as a reducing agent, a quinine-contained hydroxyl compound is used as a catalyst, air is blown into the denitrification circulating liquid so as to provide the dissolving oxygen and the oxidant for the oxidization reaction of the nitrogen oxide; a byproduct ammonium nitrate of the denitrification reaction is placed into the desulfurization liquid so as to recycle the nitrogen ammonium; and ammonia nitrogen chemical fertilizer ammonium sulfate and ammonium nitrate are recycled, and the entire technological flow is free from discharging sulfur-contained or ammonia nitrogen-contained waste liquid out of the system. Due to the adoption of the method, the integration of the desulfurization and the denitrification can be realized, the device is miniaturized, and no waste liquid is discharged in the technological process.

The invention discloses a sewage treatment method for simultaneously removing phosphor and nitrogen in a process of reinforcing autotrophic denitrification of sulfur and belongs to the technical field of sewage treatment. According to the method, pyrite, sulfur and siderite are adopted for strengthening a denitrification process of the wastewater and the effect of simultaneously removing phosphor and nitrogen is promoted. According to the method, pyrite and sulfur are used as sulfur sources and siderite is used as a carob source in a reaction system. The synergistic effect of the pyrite and sulfur can strengthen the utilization of the thalli for the siderite, so that the denitrification capacity can be reinforced. The ferric and ferrous ions, which are released by pyrite and siderite, and phosphate radical ions can form the ferric phosphate sediment, so that the dephosphorization capacity is reinforced. The method has an excellent effect, is low in cost and is suitable for engineering application.

The present invention relates to a deep denitrification process and device for domestic sewage without additional carbon source. The present invention is a combination process composed of anaerobic acidification tank, micro-aeration vertical underflow wetland and horizontal underflow wetland. The specific process is as follows: The domestic sewage enters the anaerobic acidification tank; the effluent from the anaerobic tank enters the micro-aeration vertical subsurface flow wetland; the treated sewage from the micro-aeration vertical subsurface flow wetland enters the horizontal subsurface flow constructed wetland. The effluent from horizontal subsurface flow wetlands can be used to supplement static landscape water bodies and other purposes. The present invention controls the ratio of NH4+-N/NO3--N in the horizontal subsurface flow wetland influent to 1-1.4:1 through the adjustment of appropriate process parameters, and the actual BOD5/N is far lower than the theoretical value of denitrification BOD5/N Under these conditions, anaerobic ammonium oxidation can be stably realized in constructed wetlands, forming a low-cost, high-removal sewage deep denitrification process. Micro-aeration vertical flow wetlands + horizontal subsurface flow wetlands can be applied to sewage treatment plants. Advanced water treatment can also be used for decentralized domestic sewage treatment. The invention has the advantages of simple structure, low cost and convenient operation and maintenance, and can achieve a TN removal rate of over 95%, stable pollutant removal effect, and effluent water quality up to Class IV standard of surface water.

Methods and systems are provided for reducing ammonia partially by a denitrification process. A stream containing ammonia is contacted with oxygen to form a first product stream in low dissolved oxygen conditions. The ratio of oxygen to nitrogen is about 2.28 g O₂/g N—NH₃ (2.28 grams of oxygen per gram of nitrogen in ammonia) or less. The first product stream is then exposed to organic matter in an amount of 0.57 g COD/g N—NH₃ (0.57 grams of chemical oxygen demand per gram of nitrogen in ammonia). This microbial reaction ultimately produces nitrogen gas, water, and carbon dioxide.

The invention relates to multistage anaerobic, aerobic and anoxic dephosphorization and denitrogenation technology, which is mostly suitable for treating urban domestic sewage. The sewage is divided into two parts, namely approximately 30 percent of the sewage is mixed with return sludge and enters into an anaerobic tank, and most of the sewage exceeds the anaerobic tank and directly enters into an anoxic tank for denitrogenation in a multipoint mode; after denitrogenation is completed, the mixed solution is mixed with a small part of the sewage and enters into a secondary settling tank for sludge-water separation; and denitrogenation reaction is continuously completed during sludge-water separation; and the return sludge and nitrite nitrogen and nitrate nitrogen of discharged water are reduced, and residual sludge is discharged regularly. The multistage anaerobic, aerobic and anoxic dephosphorization and denitrogenation technology has high phosphor and nitrogen removal rate, reduces the capacity of a structure, saves investment, fully utilizes carbon sources and simultaneously reduces direct oxygen consumption because the sewage does not directly enter into an aerobic tank and then the carbon sources in the sewage do not directly contact oxygen, and improves the catch rate of air bubbles and obviously saves the aeration cost due to ultrahigh sludge concentration in the aerobic tank under the condition of blast aeration.

The invention provides a device and method for treating low-C/N (carbon/nitrogen) ratio urban sewage by an anoxic/aerobic SBR-DEAMOX (denitrifying ammonium oxidation) denitrification process. One part of the urban sewage firstly enters an anoxic/aerobic SBR reactor and is subjected to pre-denitrifying and nitrifying reaction; and the produced nitrifying liquid is mixed with the other part of raw sewage, and the mixture enters a partial DEAMOX reactor for denitrification. The method comprises the following steps that: 65-85% of the raw water enters the anoxic/aerobic SBR reactor; the pre-denitrifying process is performed by use of the carbon source in the raw water to reduce the residual NO3<->-N of the system in the previous cycle; the NH4<+>-N is oxidized into NO3<->-N by aeration; the nitrifying liquid and 15-35% of the raw water together enter the DEAMOX reactor; and by taking the NO2<->-N produced by partial denitrifying as an electron acceptor, the NH4<+>-N in the raw water generates N2 through anaerobic ammonium oxidation reaction to realize deep denitrification of low-C/N ratio urban sewage. The technology makes full use of the carbon source in the raw water, does not need an external carbon source, saves energy consumption of aeration, and is an economical and efficient new means for solving the problem in the denitrification of low-C/N ratio urban sewage.

The invention discloses a method for synchronously removing nitrogen and phosphorus in sewage containing nitrogen and phosphorus, belonging to the field of sewage treatment. The method comprises the steps of (1) screening thiobacillus denitrificans: screening thiobacillus denitrificans from anaerobic activated sludge and taking as target strain, wherein thiobacillus denitrificans utilizes sulphur source in ferrous sulfide to conduct autotrophic denitrification; (2) preparing fillers of a reactor: directly adding ferrous sulfide with the particle size smaller than 25mm in a reaction container; (3) adding sewage: feeding sewage to be treated into the reaction container, wherein the sewage to be treated is the sewage containing nitrogen and phosphorus with the pH value of 5.0-9.0; (4) conducting the autotrophic denitrification process: conducting the mixed reaction for 2 to 6d at the temperature of 10 DEG C-40 DEG C under the anaerobic condition in the reaction container, reducing NO2<-> and NO3<-> in water to be N2 by thiobacillus denitrificans while simultaneously oxidizing ferrous sulfide by thiobacillus denitrificans, and simultaneously, precipitating phosphorus in water by utilizing iron ions (being oxidation products); and (5) separating solid and liquid. According to the method, the technology for removing nitrogen by utilizing thiobacillus denitrificans and the technology for removing phosphorus by using iron ions are fused naturally, the reaction cost is low, and the processing effect is good.

The invention discloses a culture method of a nitrosomonas sp. flora and a treatment method of waste water containing ammonia nitrogen. The ammonia nitrogen concentration and the pH value of a matrix are increased during an enrichment process, and free NH3 with higher concentration is maintained, thereby gradually achieving the purposes of eliminating nitrobacter sp. and enriching nitrosomonas sp. and obtaining a nitrosomonas sp. flora. Then, the obtained nitrosomonas sp. flora is taken as seeds, the expanded culture is carried out by utilizing self-prepared ammonia nitrogen waste water or high ammonia nitrogen waste water as a culture liquid, the nitrosomonas sp. flora after the expanded culture is inoculated into a biochemical treatment pool for improving the removal efficiency of ammonia nitrogen by biochemical treatment, or the nitrosomonas sp. flora after the expanded culture is directly used for removing the ammonia nitrogen of the ammonia nitrogen waste water, and the optimal proposal is used in the aerobic nitrification stage of the shortcut nitrification-denitrification process for accumulating nitrite nitrogen as an electron acceptor for denitrification directly. The method has simple process and outstanding effect of treating the waste water containing the ammonia nitrogen.

The invention discloses an ammonia-spraying grid device for SCR-method flue gas denitrification, which comprises an ammonia-spraying grid consisting of bundles of metal pipes, wherein each metal pipe is provided with a nozzle in the radial direction; the nozzle is communicated with the metal pipe; and the included angle between the opening direction of the nozzle and the flow direction of flue gas is between 0 and 90 degrees. The invention also discloses an SCR-method flue gas denitrification process adopting the ammonia-spraying grid device. The process adopts the ammonia-spraying grid to distribute ammonia/air gas mixture sprayed into an inlet flue of a denitrification reactor, and adjusts ammonia spray distribution according to the concentration of NOx in the inlet flue of the reactor so as to mix the NOx in the flue gas with NH3 sprayed in well, thus the mixing effect of the NH3 and the flue gas as well as denitrification efficiency can be effectively improved. A grid-type ammonia spraying-distributing-mixing device of the invention has the advantages of simple structure, low mixture resistance, good distribution effect, insusceptibility to ash deposition, capability of effectively protecting ammonia-spraying grid nozzles from wear, reducing the mixture distance of ammonia and the flue gas in an inlet of the denitrification reactor, improving the utilization rate of denitrification catalysts, reducing the height of the denitrification reactor and reducing the resistance of a flue gas denitrification system, thereby greatly reducing the unit cost of flue gas denitrification.

In the invention discloses an energy-saving treatment method of high strength ammonia wastewater, which comprises procedures of pre-processing, short-cut nitrification, micro-electrolysis and after-treatment. The method is characterized in that firstly wastewater is preprocessed to transform Kjeldahl nitrogen into amino nitrogen, then the wastewater enters a main body of the process to be processed. In a short-cut nitrification tank, the amino nitrogen in the wastewater is nitrated and controlled to a nitrite nitrogen stage, then a micro-electrolysis reactor is employed to replace anaerobic denitrification or ammonoxidation process to be denitrified, the nitrite nitrogen and organic pollutants in the wastewater are highly effectively degraded and are further subsequently processed by employing biological method and physicochemical oxidation method, and outlet water of the wastewater reaches standards. The method makes full use of water quality of raw water, the additional medicament consumption is saved, the process flow is shortened, and the process operation is simplified. Compared with the conventional denitrification process, the denitrification rate is increased, the total nitrogen removal rate reaches 60%-75%, and the treatment effect of degrading hardly degradable organics is remarkably increased. The treatment cost of wastewater per ton by employing novel method can be reduced by 30-50%.

The invention discloses a control method for a partial nitrification-anaerobic ammonia oxidation integrated SBR (Sequencing Batch Reactor) denitrification process. The method consists of a dissolved oxygen-ammonia nitrogen control method and a pH-ammonia nitrogen control method respectively, wherein the dissolved oxygen-ammonia nitrogen control method comprises the steps that a dissolved oxygen on-line electrode and an ammonia nitrogen on-line electrode are utilized, the aeration rate is controlled through the dissolved oxygen on-line electrode, furthermore the concentration level of NO2-N in an SBR is controlled so as to synchronously carry out the partial nitrification and the anaerobic ammonia oxidation reaction in one same SBR, and the ammonia nitrogen residual concentration in the SBR is controlled through the ammonia nitrogen on-line electrode; and the pH-ammonia nitrogen control method comprises the steps that a pH on-line electrode and the ammonia nitrogen on-line electrode are utilized, an aeration system is controlled to stop through the decreasing amplitude delta pH1 of the pH at the nitration period, the aeration system is controlled to start through the increasing amplitude delta pH2 of the pH in the anaerobic ammonia oxidation period, the partial nitrification and the anaerobic ammonia oxidation reaction are carried out in one same SBR alternatively, and the ammonia nitrogen residual concentration in the SBR is controlled through the ammonia nitrogen on-line electrode.

The invention discloses a sequencing batch internal circulation biological denitrification process. The process mainly comprises four steps of water feeding, biological denitrification reaction, precipitation and water and mud discharge. The biological denitrification reaction comprises an internal circulation reaction from short-cut nitrificaition treatment to deoxidation treatment, anaerobic ammoxidation treatment and to the short-cut nitrificaition treatment, and the short-cut nitrificaition treatment, the deoxidation treatment and the anaerobic ammoxidation treatment are carried out in three intercommunicated different reaction areas of one reactor. The invention further discloses a biological denitrification device. The device is separated into three intercommunicated reaction areas, that is, a short-cut nitrificaition treatment reaction area, a deoxidation treatment reaction area and an anaerobic ammoxidation treatment reaction area. The device is further equipped with an aerating device, an internal circulation pump, a water distributor and the like. The process has the advantages of convenient operation management, low energy consumption, high denitrification efficiency and stable treatment effect, and the device matching the process has the advantages of compact structure, convenient use, low cost and the like.

The invention relates to the technical field of microbial-process water treatment, and particularly discloses a material for removing nitrates in water by an autotrophic microbe denitrification process and a preparation method thereof. The material is granular; and the material contains a simple substance sulfur and calcium carbonate in a mass ratio of 1.25:1-3.0:1. By compositely forming the simple substance sulfur and calcium carbonate in the granular material, the material has a rough surface, is beneficial to microbial attachment, and can provide an electron donor sulfur, an inorganic carbon source and an alkalinity-regulating buffering agent for microbes after being added once, so that the reaction is carried out continuously and efficiently, and the nitrates in the water can be completely converted into nitrogen; and thus, the material has high nitrate removal efficiency, does not need any additional additive, and is convenient to use. Underground water treated by the material hardly contains nitrates and NH4<+>-N, and achieves the national drinking water standard. The preparation method is simple to operate and easy to control. The finished product is stable and easy to transport, and thus, is suitable for industrialized popularization and application.

The present invention discloses a combined artificial wet land domestic sewage treatment method. Said combined artificial wet land is formed from front vertical-flow artificial unit land and rear surface-flow artificial wet land which are series-connected together. Firstly, the domestic sewage can be fed into precipitation tank to remove sand and large-granule suspended solids, then fed into vertical-flow artificial wet land to implement filtration treatment, in the vertical-flow artificial wet land the artificial mixed matrix can be filled and the ornamental plants can be planted, then the sewage can be fed into the surface-flow artificial wet land to make purification treatment, in the surface-flow wet land the water plants, flower plant and vegetables can be planted or the fishes can be bred.