87 results about "Ammonium oxidation" patented technology

The invention discloses a method for starting an anaerobic ammonium oxidation reactor to treat high-salt nitrogenous wastewater. Anaerobic sludge and aerobic sludge are inoculated to a reactor, starting strategies are as follows: at first, anaerobic ammonium oxidation bacteria are enriched in the reactor through maintaining the conditions of anaerobism, organic carbon source-free feed water and no saltness, and a microflora system which takes the anaerobic ammonium oxidation bacteria as dominant bacteria is built; then, salt-tolerant anaerobic ammonium oxidation bacteria are preferentially selected under the conditions of low nitrogen concentration and low saltness, non-dominant bacteria are elutriated, and a microflora system which takes the salt-tolerant anaerobic ammonium oxidation bacteria as dominant bacteria is built; and finally, the nitrogen concentration and saltness are gradually increased, so that the ammonium oxidation bacteria can be suitable for high nitrogen concentration and high saltness environments. Through a mode of gradually changing a feed water base material, the problem of slow anaerobic ammonium oxidation bacteria enrichment under saltness inhibition is solved, the starting mode is simple and practicable, and the difficulty in starting a high-salt wastewater anaerobic ammonium oxidation treatment system is lowered.

The invention discloses a DEAMOX (denitrifying ammonium oxidation) based efficient biological nitrogen and phosphors removal device adopting improved A/O (anoxic/oxic) four-point step-feeding as well as an application method of the device, and belongs to the technical field of biological sewage treatment. The DEAMOX technology is realized in an anoxic area of the A/O step-feeding technology, a traditional high carbon source dependency type DEAMOX mode is changed into a low carbon source dependency type nitrogen removal mode with combination of short-cut denitrification and anaerobic ammonium oxidation, and meanwhile, a pre-anoxic area is set, so that the influence of NO3<-> carried by return sludge on anaerobic phosphorus release is eliminated and high efficiency of nitrogen and phosphorus removal during treatment of low carbon source urban sewage with the technology is guaranteed. The device adopting the technology comprises an urban sewage raw-water tank, a pre-anoxic area, an anaerobic area, a first section of oxic area, a first section of anoxic area, a second section of oxic area, a second section of anoxic area, a third section of oxic area, a sedimentation tank and a water outlet pipe sequentially in the water-flow direction, wherein sponge filler is arranged in the first section of anoxic area and the second section of anoxic area, so that a DEAMOX reaction is realized for nitrogen removal. The device and the application method thereof have the advantages of low carbon source dosage, low aeration energy consumption and low operation cost.

The invention belongs to the field of biological treatment of sewage and discloses a device and a method for treating urban domestic sewage by coupling of short-cut nitrification anaerobic ammonium oxidation and denitrification treatment. The device mainly comprises a short-cut nitrification anaerobic ammonium oxidation and denitrification coupled SBR reactor. In a first stage which is a high-ammonia-nitrogen reinforcement stage, ammonia nitrogen is added into the urban domestic sewage to obtain high-ammonia-nitrogen low-carbon-nitrogen-ratio sewage which then enters the SBR reactor, short-cut nitrification anaerobic ammonium oxidation is mainly realized through low-oxygen aeration, and high total nitrogen removal load is finally realized by high-ammonia-nitrogen reinforcement of main functional bacteria namely ammonium oxidation and anaerobic ammonium oxidation bacteria. In a second stage which is a transition stage, influent ammonia-nitrogen concentration reduction and low-oxygen aeration are carried out. In a third stage which is an urban domestic sewage treatment stage, anaerobic stirring, low-oxygen aeration and anoxic stirring are performed respectively to realize removal of total nitrogen and COD in sewage. According to data, compared with integrated sewage directly used for urban domestic sewage treatment, integrated sewage subjected to high-ammonia-nitrogen reinforcement has advantages of stable nitrogen removal effects and energy saving and consumption reduction due to low-oxygen aeration in the aeration stage.

The invention relates to an efficient, energy-saving and consumption-reducing sewage treatment method for resource recovery. Inflow sewage and return sludge are sufficiently mixed in an activated sludge adsorption tank, most carbon and a small part of nitrogen in the sewage are transferred to the return sludge, effluent enters a settling pond for solid-liquid separation, clear water and residual sludge are drained, the residual sludge enters an efficient anaerobic digestion reactor, hydrogen or biogas and digested sludge are obtained, biogas slurry produced after dewatering of the digested sludge is conveyed into a fluidized bed reactor provided with a settling zone through MAP (magnesium ammonium phosphate), and part of residual biogas slurry obtained with an MAP method and clear water drained from the settling pond enter an anaerobic ammonium oxidation, denitrification and oxidation system respectively for denitrification; or, the clear water drained from the settling pond and the biogas slurry are merged, and denitrification treatment is performed through dominant algae and nitrogen-fixing bacteria; dominant algae adopt chlorella; finally, water is discharged. Carbon, nitrogen and phosphorus elements in sewage can be comprehensively utilized, and the method has the advantages of energy outward transportation, phosphorus recovery, low nitrogen transformation energy consumption or nitrogen recovery, greatly shortening of the reaction time and the like.

The invention provides a quickly-vitrified fire resisting cable material. The fire resisting cable material is prepared from the following raw materials in parts by weight: 40-50 parts of ethylene-vinyl acetate copolymer, 30-40 parts of polyethylene, 20-35 parts of natural rubber, 30-40 parts of butadiene styrene rubber, 4-6 parts of a compatilizer, 1-2 parts of zinc oxide, 20-30 parts of argil, 10-15 parts of kaolin, 5-6 parts of medical stone, 6-7 parts of garnet, 1-2 parts of 3-aminopropyl trimethoxy silane, 3-4 parts of rapeseed oil, 1-2 parts of pentaerythritol, 1-2 parts of melamine cyanurate, 1-2 parts of molybdenum trioxide, 4-6 parts of ammonium molybdate, 1-2 parts of copper oxide, 1-2 parts of polytetrafluoroethylene micropowder, 10-12 parts of DIBP (diisobutyl phthalate), 6-8 parts of tributyl acetocitrate, 2-4 parts of epoxyoctyl stearate, 1-2 parts of a crosslinking agent TAIC (triallyl isocyanurate), 1-2 parts of ferrocene, and 12-15 parts of a modified filler. The fire resisting cable material is high in fire resistance. At high temperature, the fire resisting cable material can be quickly vitrified to protect the normal use of a cable. Meanhwile, the fire resisting cable material is environment-friendly and high in weather resistance.

The present invention provides an ammonia oxidation/decomposition catalyst including a support composed of an oxidizable and reducible metal oxide and a catalytically active metal supported thereon. By bringing the ammonia oxidation/decomposition catalyst including a support composed of an oxidizable and reducible metal oxide and a catalytically active metal supported thereon into contact with ammonia and air at ordinary temperature, the support in a reduced state reacts with oxygen to generate oxidation heat, and the temperature of the catalyst layer is increased in a moment. Once the temperature of the catalyst layer is increased to a temperature at which ammonia and oxygen react with each other, the ammonia oxidation reaction proceeds autonomously after that. The heat generated in this exothermic reaction is used in the course of decomposing ammonia in the presence of the catalytically active metal, thereby producing hydrogen.

The invention discloses apparatus and method for removing nitrogen and phosphorus by adopting a denitrifying ammonium oxidation (DEAMOX)-based post anoxic filter enhanced anaerobic-anoxic-axic+biological aerated filter (AAO+BAF) process, and belongs to the field of sewage treatment by adopting an activated sludge method. The apparatus for removing nitrogen and phosphorus by adopting the DEAMOX-based post anoxic filter enhanced AAO+BAF process mainly consists of AAO treatment, a secondary sedimentation tank, a BAF and a post anoxic filter. By controlling average hydraulic retention time to be within 3-8 hours in an anoxic zone under the condition of low C/N ratio, the method for removing nitrogen and phosphorus by adopting the DEAMOX-based post anoxic filter enhanced AAO+BAF process is capable of synchronously realizing denitrification and phosphorus removal. The BAF is utilized so as to realize highly efficient nitrification. The post anoxic filter is arranged so as to mix ammonia nitrogen (NH4<+>-N) in the water discharged from the secondary sedimentation tank with nitrate nitrogen (NO3<->-N) in the water discharged from the BAF; and carbon source is added, so that short-cut denitrification and DEAMOX reaction occur in the post anoxic filter. Thus, the disadvantage of an AAO + BAF process, namely existence of nitrate nitrogen, is solved so as to further remove total nitrogen in municipal sewage. The apparatus and method for removing nitrogen and phosphorus by adopting the DEAMOX-based post anoxic filter enhanced AAO+BAF process are suitable for construction, upgrade reconstruction and the like of municipal wastewater treatment plants under low C/N ratio municipal sewage conditions; and requirements on total nitrogen and stable quality of discharged water are met.

The invention provides a device and method for deep nitrogen and phosphorus removal by continuous flow AO-BCO (Biological Contact Oxidation)-DEAMOX (Denitrifying Ammonium Oxidation) and belongs to thefield of biological sewage treatment. The device mainly comprises a raw water tank, an anaerobic zone, an aerobic zone, a secondary sedimentation tank, an intermediate water tank, a BCO reactor and an anoxic filter tank. The method mainly is that a pre-AO process is used for biological phosphorus removal; an effluent is divided into two sections after mud and water separation in the secondary sedimentation tank, wherein one section of effluent (50-60 percent) enters BCO for nitrification and then enters the anoxic filter tank; the other section of effluent (40-50 percent) directly exceeds theBCO to enter the anoxic filter tank, so that an optimum matrix ratio is provided for DEAMOX reaction. Therefore, the deep nitrogen removal of sewage is realized. The device and the method provided bythe invention are suitable for the treatment of the low-C/N urban domestic sewage, the effluent water quality is stable, and the energy consumption can be saved by 40-50 percent.

The invention relates to an improved method for resolving an ammonium salt in an acrylonitrile non-ammonium-sulfate process and is mainly used for solving the problem that the energy consumption is high during ammonium salt resolving in the prior art. According to the technical scheme, the method comprises the following steps: (1) enabling a reaction gas I and a low-ammonium absorption liquid I to come into contact with unreacted ammonium in a quenching tower so as to obtain a high-ammonium absorption liquid II and a ammonium-free reaction gas II; (2) performing steam stripping on the high-ammonium absorption liquid II in a stripping tower and then performing oil-water separation so as to obtain a high-ammonium absorption liquid III; heating the high-ammonium absorption liquid III in a resolving tower and performing the steam stripping so as to obtain an ammonium gasflow III and an ammonium dihydrogen phosphate crystal IV; dissolving the low-ammonium absorption liquid V; returning the absorption liquid V into the quenching tower for absorbing the unreacted ammonium; and (3) performing rectification separation on the ammonium gasflow III in an ammonium rectification tower so as to obtain ammonium IV with high purity; and returning the ammonium IV into an ammonium oxidation reactor and reacting. Thus, the problem in the prior art is solved well. The method provided by the invention can be applied to an industrial device of acrylonitrile.

The present invention provides a biological process for reducing the levels of nitrogen and phosphorous in wastewater, wherein said wastewater comprises at least 100mg/L total nitrogen wherein said process comprises feeding said wastewater into a reaction vessel in at least two steps, wherein said reaction vessel comprises an active biomass comprising nitrifying and denitrifying organisms and polyphosphate accumulating organisms (PAOs), wherein at least the first feed step is followed by a non-aerated period of sufficient duration to result in sufficiently low concentrations of NOx species in the wastewater to allow for accumulation of polyhydroxyalkanoates in the PAOs, and at least the first non-aerated period is followed by an aerated period of sufficient duration to allow for ammonium oxidation by the nitrifying organisms and assimilation by the PAOs of at least a portion of the phosphorous in the wastewater.

The invention discloses an anaerobic ammonium oxidation strain preservation method. The method includes: flushing sludge containing an anaerobic ammonium oxidation strain with inorganic salt solution,and keeping in a preservation container; adding a protecting agent into the preservation container, well mixing, removing dissolved oxygen in mixed solution, and preserving at 4-25 DEG C, wherein theprotecting agent is a mixture of water and an anaerobic ammonium oxidation bacterium extracellular polymeric substance. By adoption of the protecting agent which is a biological endogenous substance,biological exclusion is avoided, and guidance significance to anaerobic ammonium oxidation strain preservation at different temperature conditions can be achieved. The invention further discloses ananaerobic ammonium oxidation strain preservation recovery method. The recovery method includes that the anaerobic ammonium oxidation strain is taken out from the preservation container, flushed with water and the inorganic salt solution respectively and recovered in a reactor. By adoption of the methods, the anaerobic ammonium oxidation strain can be preserved effectively, and the denitrificationperformance of the preserved sludge can be recovered in a short time.

The invention discloses a device and a method for processing high ammonia-nitrogen wastewater and domestic sewage by combining continuous flow partial nitrification/ anaerobic ammonia oxidation with DEAMOX (DEnitrifying AMmonium OXidation), and belongs to the field of sewage and sludge biotreatment. The device comprises a high ammonia-nitrogen wastewater storage tank, an up-flow sludge bed USB (Universal Serial Bus) reactor, a middle water tank, a domestic wastewater storage tank, an SBR (Sequencing Batch Reactor) and a water discharging tank. The method comprises the following steps: high ammonia-nitrogen wastewater enters the up-flow sludge bed USB reactor; ammonia nitrogen is converted into nitrogen and nitrate nitrogen by ammonia oxidizing bacteria and anammox bacteria; effluent and domestic sewage simultaneously enter the SBR; nitrate nitrogen in the effluent and ammonia nitrogen in the domestic wastewater are converted into nitrogen and nitrate nitrogen by denitrifying bacteria and anammox bacteria. According to the device and the method, the problem of excessive effluent nitrate nitrogen when a partial nitrification/ anaerobic ammonia oxidation technology is used is effectively solved, and meanwhile, the efficient denitrification of the domestic sewage is realized.

The invention relates to a method for deep denitrification by means of a denitrification ammonium oxidation moving bed biofilm reactor (MBBR) process, belonging to the technical field of sewage treatment. The method comprises the steps of adding MBBR filler into an anaerobic area and an anoxic area, controlling denitrification reduction in a nitrous stage, and enabling the produced nitrite and ammonia nitrogen in the raw sewage to be subjected to an anaerobic ammonium oxidation reaction so as to realize deamination in a way of denitrification ammonium oxidation. The method applies denitrifyingbacteria and anaerobic ammonia oxidizing bacteria into sewage treatment, and a carbon source and energy can be saved by means of denitrification ammonium oxidation, so that the advanced nitrogen removal of the sewage is realized.

The invention provides a device for deeply treating secondary effluent of urban sewage through partial reduction, coupling and ammonium oxidation of nitrate, and a real-time control method, and belongs to the technical field of sewage biological treatment. The secondary effluent of the urban sewage is deeply treated through partial reduction, coupling and ammonium oxidation of the nitrate for which an organic carbon source in the urban sewage is utilized to provide an electron donor, and an automatic control system is arranged in a sequencing batch reactor (SBR) and comprises chemical oxygen demand, ammonia nitrogen and nitrate nitrogen online monitoring sensors; and NH4+-N, NO3--N and COD signals which are collected online are input into an online parameter control instrument, and by setting an automatic control program, an adjusting signal is output and acts on all executing unit controllers to adjust the mass and concentration ratios of COD/NO3--N and NH4+-N/NO3--N in the reactor intime. The denitrification efficiency in the anaerobic ammonium oxidation process of the urban sewage is improved, the organic carbon source in the urban sewage is sufficiently utilized, the operatingcost is lowered while the nitrite accumulation efficiency is improved, operation is easy, and the urban sewage can be stably and efficiently denitrified.

Provided is a wastewater treatment apparatus and a wastewater treatment method, in which denitrification process by anaerobic ammonium oxidation method can be stably performed at low cost. The wastewater treatment apparatus includes an ammonium oxidation tank and a heating tank in which the microbial sludge withdrawn from the ammonium oxidation tank is subjected to heat treatment. A wastewater treatment method is to heat the microbial sludge withdrawn from the ammonium oxidation tank by using heat supplied from a digestion tank in which waste sludge is digested by anaerobic microorganisms or from a heat source for heating the waste sludge to be digested in the digestion tank, and to return the microbial sludge, in which activity of nitrite oxidizing bacteria is reduced by the heat treatment, to the ammonium oxidation tank, so that the ammonium nitrogen contained in the wastewater is oxidized to nitrite nitrogen.

The invention relates to a method for processing ammonia-nitrogen wastewater. As an improvement, nitrogen-containing wastewater is processed through zero-valent iron loaded on montmorillonite and naerobic ammonium oxidation bacteria. The nitrogen-containing wastewater is processed through the zero-valent iron (MMT-ZVI) loaded on the montmorillonite and activated sludge through coupling; compared with a method of only adding the zero-valent iron ZVI without adding the MMT-ZVI, active sites of the zero-valent iron loaded on the montmorillonite are increased, stability is enhanced, and the denitrification efficiency is higher. By means of the method, compared with the method of only adding the zero-valent iron, the water outlet pH is stable and cannot goes beyond the normal range, the water pH does not need to be specially adjusted, the great growth and reproduction of microorganisms are facilitated in the wastewater long-term treatment process, and a good treatment effect can be kept fora long time.

The invention discloses a medical waterproof anti-rusting coating and a preparation method thereof. The medical waterproof anti-rusting coating comprises the following raw materials: water, epoxy resin, an ethylene propylene diene monomer, diphenyl ether resin, poly zinc oxide resin, phosphoric acid, potassium dichromate, ammonium molybdate, iron oxide red and zinc oxide. The medical waterproof anti-rusting coating can prevent rusting or corrosion when being used on medical instruments, a coating film is smooth and bright in appearance, the viscosity of the coating is 60-80s, first-class adhesion property can be achieved, the coating is resistant to salt mist, is free of abnormity within 10-30 days, resistant to water for 20-60 days, free of bubble or peeling off and resistant to salt and free of abnormity within 30-50 days, the surface drying time is 1-4 hours, the actual drying time is 18-22 hours, the coating is simple in preparation method and can be widely produced to replace conventional materials constantly, and the raw materials can be simply and easily obtained.

The invention relates to a novel spraying device and a neutralization method. With an ammonium oxidation reaction gas cooling tower in prior arts, multilevel spraying spray amount distribution is not reasonable; cooling effect is poor; and ammonium neutralization effect is poor. The invention mainly aims at solving the problems. The invention provides the novel spraying device and the neutralization method. According to the spraying device, nozzles form an arrangement of multiple spraying levels according to geometric shapes; the spraying amounts of the multiple spraying levels are gradually reduced from bottom to top; by weight, the spraying amount of the last spraying level is 0.5-1 time that the spraying amount of the next spraying level. With the technical scheme, the problem is well solved. The device can be applied in an industrial device of ammonium oxidation reactions.