600 results about "Biological oxidation" patented technology

A wastewater treatment process having improved solids separation characteristics and reduced biochemical oxygen demand (BOD) in the purified wastewater comprising the steps of: passing wastewater through a main aerobic biological oxidation zone and therein oxidizing a portion of the BOD a portion of the ammonia nitrogen content (NH3-N); passing the effluent from said aerobic biological oxidation zone to an aerobic/mixing zone and therein mixing said effluent with effluent from the anoxic/anaerobic zone; passing the effluent from said aerobic/mixing zone to a settling zone and therein separating purified wastewater having reduced BOD and suspended solids, and sludge containing suspended solids; passing a portion of the sludge formed in the settling zone and volatile acids to an anoxic/anaerobic zone and therein increasing the extracellular polymer content of said sludge, the release of phosphorus into solution and the reduction of nitrate nitrogen to molecular nitrogen gas; and recycling an effective amount of the effluent from said anoxic/anaerobic zone to said aerobic/mixing zone. In an alternative embodiment, a volatile acid is added to a zone to which no additional oxygen has been added that is in the flow path from the main aerobic biological oxidation zone or, alternatively, it may be added to the anoxic/anaerobic zone and the thus-treated effluent is passed to the aerobic/mixing zone wherein phosphate is removed from the effluent.

The invention relates to a process for extracting gold from low-grade difficultly-treatable gold ore containing arsenic and carbon. The process is characterized in that: the gold ore has the characteristics of high clay mineral content, large fine ore amount after grinding, and the like. The process comprises the following steps of: grinding raw ore to 10 to -30 millimeters; sieving ore through a sample sieve of 1 to -2 millimeters or washing the ore with water so as to separate fine ore from the ore; floating gold concentrate by using the obtained fine ore; performing direct heap leaching on ore of +2 millimeter and performing biological oxidation; performing medium transformation such as acid washing, water washing, alkali washing and the like on the biologically-oxidized ore and cyaniding directly so as to extract gold, wherein gold is extracted from the floated gold concentrate by biological oxidation-cyaniding and carbon soaking-pressure oxidation-cyaniding and gold extraction or baking, oxidation and cyaniding. Due to the adoption of the process, the problem of permeability of gold ore is solved and the gold extracting rate is effectively increased from 2 to 5 percent during direct heap leaching and cyaniding to 55 to 65 percent. The process has the advantages of simple process, high gold extracting rate, low pollution, high benefit and the like.

The invention belongs to the technical field of environment protection and particularly relates to a treatment process of organic wastewater containing high-concentration ammonia nitrogen, which is characterized by comprising the following steps: 1, carrying out pretreatment; 2, carrying out anaerobic treatment, and leading effluent from a coagulation/air floatation pool to an upflow anaerobic sludge blanket (UASB) reactor, wherein the hydraulic power stays for 40 to 120 hours; and 3, treating in a membrane bioreactor system. Through microanaerobic/aerobic environments on a surface layer, as well as the absorption by a microporous structure and biological oxidation action, various pollutants such as organic matters, nitrogen and phosphorus in the wastewater can be removed from wastewater of an ecological base flow, and when the ecological base flow is introduced to a membrane biological reactor (MBR) system, the impact resistance and treatment efficiency of the biological treatment unit can be improved.

The invention discloses an enzyme-chemocatalysis racemization removing preparation method for L-glufosinate-ammonium. According to the method, a one-pot reaction manner is adopted, under the molecular oxygen, immobilization D-amino acid oxidase catalyzes D-enantiomer in an enantioselectivity mode into 2-imino-4-(hydroxy methyl phosphonyl) butyric acid in a dehydrogenation mode, and palladium-ammonium formate catalyzes 2-imino -4-(hydroxy methyl phosphonyl) butyric acid into DL-glufosinate-ammonium in an in-situ reduction mode. Hydrogen peroxide produced in the process is efficiently decomposed into water and oxygen through catalase. Complete reacemization removing of DL-glufosinate-ammonium and efficient preparing of L-glufosinate-ammonium are achieved through biological oxidation-chemical reduction circulation. The method has the advantages that the process is simple, cost is low, environmental friendliness is achieved, and energy is saved. High-concentration DL-glufosinate-ammonium can be converted into L-glufosinate-ammonium. The yield is 90%, the optical purity of the product is 99%, and the method is suitable for industrial production of L-glufosinate-ammonium.

The invention relates to a deep processing method of wastewater in the coal chemistry industry. The method comprises the following steps in sequence: subjecting the effluent, which has been processed by a secondary biochemical treatment for wastewater in coal chemistry industry, to a chemical oxidation treatment and a biological oxidation treatment in sequence. The processing method adopts a technology integrating the chemical oxidation and biochemical oxidation, thus overcomes the shortage of high operation cost of the chemical oxidation technology and the shortage of low COD elimination rate of the biochemical oxidation technology, and achieves the degradation of partial organic pollutants in wastewater. The processed wastewater reaches the discharge or recycle standard, and the pollution to the environment is reduced. The processing method has the advantages of high processing efficiency, low operation cost, and strong adaptability for wastewater in coal chemistry industry, the processed wastewater reaches the national environmental requirements, and thus the processing method can achieve good economic and social profits.

The invention provides a process for treating antibiotic pharmaceutical wastewater. The process comprises the following steps that: A, pharmaceutical wastewater is subjected to precipitation separation, enters a primary biological oxidation pond, is added with yeast or mould for biochemical treatment, stays in water for 6 to 72 hours, is taken out from the water, and then is subjected to solid-liquid separation; B, the wastewater treated in a step A is oxidized, wherein oxidation conditions are as follows: the pH of the wastewater is regulated to be between 3 and 4.5; hydrogen peroxide and divalent iron reagent are added for oxidation; oxidation time is 1 to 10 hours; the molar ratio of the hydrogen peroxide H2O2 to divalent iron Fe is 1 to 50; and the hydrogen peroxide is 1 to 10 times the concentration of antibiotics in the wastewater; or the oxidation conditions are as follows: the pH of the wastewater is regulated to be between 7 and 11; ozone is supplied for oxidation; the dosage of the ozone is 30 to 120 mg/L; and the oxidation time is 1 to 10 hours; C, the wastewater treated in a step B is subjected to solid-liquid separation, enters a secondary biological oxidation pond, and then is oxidized to remove substances easy to biodegrade; and D, the wastewater treated in a step C is precipitated, and then supernatant is discharged.

This invention is related to a process of disposing urban sewage, which comprise the steps of coagulate filtration, ozone oxidation, biological oxidation to dispose urban sewage, so that the residual undegradable organic substances, bacteria and virus in the second-class urban sewage can be removed and the water can be recycled. According to different usages of the recycled water, the process also comprises reverse osmosis or nanoscale filtration treatment to further remove the residual organic and inorganic substances in the water. The process is a combination of coagulate filtration, ozone oxidation, biological oxidation and reverse osmosis, designed to resolve such problems as urban sewage disposal and water recovery. The process can obtain high-quality recycled water with a low cost, showing high cost performance, which is important to resolving urban water depletion, raising the utilization rate of water resources, reducing environmental pollution and promoting sustainable development of the society.

The invention discloses an anaerobic biological oxidation water pollution remediation method with Fe3+ in hematite as an electron acceptor. According to the method, Fe3+ in hematite serves as the electron acceptor and is loaded with functional microbial florae, and reduction-state pollutants in water are subjected to oxidation removal in the anaerobic or anoxic environment, wherein functional microorganisms include Geobacter sulfurreducens and Shewanella spp.. The method is wide in application range, low in cost, ideal in effect and especially suitable for remediating polluted water with high remediation difficulty.

A multi-stage treatment for effluent or sewage is carried out by pre-oxidation treating for waste calcium water in production of sodium alginate, decalcifying treating, solid-liquid separating for mixed effluent, oxidation pre-treating, biological filtering, oxidation treating, air-floating treating, flocculating, depositing, efficient ozone circulation and oxidation treating for mixed comprehensive water, de-coloring, filtering, biological oxidation treating and reverse osmosis treating. It's safe, reliable, rational, standard, cheap and efficient, it has better quality and zero-effluent discharge, and saves water sources.

An apparatus for treating the petrochemical sewage by aerating, bio-filtering and ozone oxidizing is composed of bio-filtering pool and ozone oxidizing unit. Its method includes such steps as primary bio-filtering, biologic oxidizing, aerating for filling oxygen, ozone oxidizing, and bio-filtering to form a treating circulation.

The invention discloses a processing method for a malodorous gas of a chemical area sewage plant, and particularly relates to a chemical absorption-biological oxidation-absorption combined processing method. The malodorous gas enters a chemical washing tower, is subjected to absorption, oxidation and humidification in the washing tower, then enters a biological filter tower, contacts with microbe inoculated on filler surfaces, then enters an absorption device after being degraded by the microbe, and is discharged after being further purified by an adsorbent. An empty bed residence time of the gas in the biological tower is 10-120 s; and an empty bed residence time of the gas in the absorption device is 0.5-120 s. A nutrition liquid needed by the microbe in the biological filter tower is effluent of a secondary sedimentation tank of a sewage treatment plant or diluted raw water of a buffer and homogenization tank. The chemical absorption-biological oxidation-absorption combined processing method can remove hydrogen sulfide and volatile organic compounds from the malodorous gas of the chemical area sewage plant efficiently and realizes standard discharge. The method has the advantages of simple process flow, simple operations, low investment and operation cost, high processing efficiency and no secondary pollution.

The invention discloses a new type immersion ore bioreactor to proceed biological oxidation of sulfide mineral in biological metallurgical technical domain, which is characterized by the following: adopting internal ring gas-flow elevating type reactor; using compressed air as liquid hoisting power to accelerate the macrography mixing of material and mass transfer course; and providing oxygen for growth of microbe and biological oxidation of mineral; lightening the attrition and damage of microbiological thallus caused by ore sand greatly; comparing to traditional stirring type immersion ore bioreactor; composing by cylindrical tank and bottom of tank; assembling three built-in type guild shell to decrease the height of reactor; making the high diameter ratio (H/D) reach 1-1.5 range of the reactor. This invention possesses merits of soft stirring, small hurt for cell, good mass transfer effect and simple structure, which compared to traditional method.

This invention relates a wastewater purifying system in hospitals, comprising interconnected grilles, a regulating disinfection pool, a coagulation pool, a preliminary settling tank, a hydrolysis-acidification pool, an aerobic bio-filter, a secondary settling tank, an advanced oxidation device, a sludge pool and a recycling impounding reservoir. The regulating disinfection pool is used to accumulate original wastewater released from every source and the advanced oxidation device is used to oxidize remained organic matters into inorganic molecules via chemical and biochemical methods or via physical methods and could be an electric biological oxidation treatment device. This system possesses high purifying degree and purified water from this system can be used as reclaimed water.

The invention discloses a reclaiming method of valency element from acidic rocan biological oxidation extract gold waste liquid, which comprises the following steps: adding acidic rocan biological oxidation extract gold waste liquid and precipitant into autoclave at the same time; depositing selectively; realizing arsenic iron separation; adopting filtering technology; realizing solid and liquid separation; leading solid phase into iron-oxide red preparing process; leading liquid into process of reclaiming rocan; adjusting the solution to neutral with solid-liquid; condensing at 0-4 deg.c; crystallizing to Na2SO4.10H2O; returning the tail liquid to the first process; using to formulating queous alkali. The good effect of this invention can realize effective segregation of rocan and iron of acidic rocan biological oxidation extract gold waste liquid.

The invention discloses a distributed domestic sewage treatment method. The method combines process units of anaerobic, jet oxygenation, biological oxidation, artificial wetland and the like together to perform anaerobic, aerobic and wetland ecological three-stage treatment on the domestic sewage so as to effectively reduce CODcr and BOD5 of the domestic sewage; and dephosphorization and denitrification are performed, and the effluent is stable and reaches the standards before emitting. A jet oxygenation pulse water distributor is adopted in the jet oxygenation, and the jet oxygenation pulse water distributor oxygenates the anaerobic effluent and provides pre-oxygenation treatment for a subsequent aerobic process; the biological oxidation is performed in a trickling filtration tower which is designed with 2 to 3 layers and provided with vent holes, a ceramic filler is placed in the trickling filtration tower, and the trickling filtration tower distributes water by adopting time control pulse so that the re-oxygenation effect of the trickling filtration tower can be improved and no power is consumed; and the artificial wetland is designed in an undercurrent form, proper fillers such as coal cinder, plaster, gravels and the like are placed in the artificial wetland, and pollutants can be further degraded and removed from the wetland environment. The method is suitable for standard-reaching treatment of rural or urban distributed domestic sewage.

The invention discloses a method for treating wastewater produced in a process for directly liquefying coal. The method for treating the wastewater comprises the following steps of: treating wastewater produced in the process for directly liquefying the coal by a catalytic wet air oxidation method to obtain wastewater subjected to primary treatment; and performing secondary treatment on the wastewater subjected to primary treatment by a biological oxidation method. According to the method for treating the wastewater produced in the process for directly liquefying the coal, the wastewater produced in the process for directly liquefying the coal is treated by the catalytic wet air oxidation method, so the chemical oxygen demand (COD) removal rate of the wastewater can reach over 80 percent, phenol, aldehyde and other substances which have the toxic effects on microorganisms can be oxidized into micromolecule carboxylic acid and other substances which can be decomposed by the microorganisms easily, and wastewater which is further subjected to biological oxidation can be discharged under the condition of meeting the standard. The method is simple, the wastewater produced in the process for directly liquefying the coal can be treated in a centralized and unified way, and independent treatment is not required; and therefore, treatment efficiency is greatly improved.

The invention belongs to the field of mineral resource comprehensive utilization, and relates to methods for reduced leaching of oxidized ore and oxidation leaching of sulfide ore through biological and chemical catalysis, in particular to a biological-chemical metallurgy method by jointly utilizing the oxidized ore and the sulfide ore. The reduced leaching of the metal oxidized ore and the oxidation leaching of the metal sulfide ore are realized by utilizing auxoautotrophs, auxohetertrophs or a mixture thereof under mild conditions; and the mixture ratio of the metal oxidized ore to the metal sulfide ore can be adjusted by adding organic biomass. The leachate is purified, concentrated and crystallized into metal sulfates which are then reduced and thermally decomposed into products of sulfur dioxide and metal oxides; and the sulfur dioxide is subjected to biological oxidation to prepare sulphuric acid for recycling.

The invention relates to a method for highly-efficiently performing hazard-free and biochemical treatment on alkaline residue from oil refinery, which mainly comprises the following steps: diluting and neutralizing the alkaline residue; performing two stages of biological pretreatment on alkaline residue sewage produced by the dilution and neutralization; and filtering the alkaline residue sewage subjected to the two stages of biological oxidation pretreatment, introducing the filtered alkaline residue sewage into an oxidation column, catalyzing and oxidizing the alkaline residue sewage at the normal temperature and under the normal pressure, performing a subsequent third stage of biological oxidation treatment on the alkaline residue sewage which is catalyzed and oxidized with ozone until the alkaline residue sewage reaches a standard, and discharging the alkaline residue sewage. The method has the advantages of low investment, low operating cost and high pollutant removal rate.

The invention discloses a method for treating electroplating wastewater. The method comprises the following steps: (1) primary physical-chemical treatment; (2) secondary physical-chemical treatment: after the discharged water generated in step (1) is subject to homogenizing treatment, adding sodium hypochlorite into the homogenized water, then adding sodium pyrosulfite into the obtained product to remove residual chlorine, and adding aluminum chlorhydroxide into the obtained product; and (3) biochemical system treatment: adding appropriate biochemical sewage into the product obtained in step (2), mixing the biochemical sewage and the product, then feeding the obtained mixture into a biological hydrolysis pool; controlling the mixture under appropriate conditions and within an appropriate retention time; carrying out reduction on the obtained mixture by utilizing facultative anaerobes; and hydrolyzing the obtained discharged water subjected to reduction, feeding the discharged water into an aerobic biological oxidation pond, and then carrying out mass propagation of engineering bacterias under an appropriate condition by using organic pollutants in wastewater. By using the method provided by the invention, the total treatment rates of a system are as follows: the treatment rate of heavy metal is greater than or equal to 99.7 percent, the treatment rate of ammonia nitrogen is greater than or equal to 90 percent, and the treatment rate of chemical oxygen demand (COD) is greater than or equal to 88 percent, therefore, the electroplating wastewater treated by using the method comprehensively meets the requirements of the Discharge Standard for Pollutants from Electroplating Industry (GB21900-2008).

Process for regenerating, recovering and utilizing low-concentration organic effluent is carried out by biological oxidation treating for low-concentration organic effluent, entering it into tilted-plate settling tank, adding flocculating agent into inlet pipe of tilted-plate settling tank, depositing while separating out supernatant fluid, two-stage filtering by fibrous filter and quartz sand filter, filtering by security filter, passing into high-pressure pump, entering into reverse osmose filter and separating. It's cheap, stable and convenient, COD removing rate reaches 96%, ammonia-nitrogen removing rate reaches 99%.

The invention belongs to the technical field of methane desulfurization, and particularly relates to a methane biodesulfurization method. The methane biodesulfurization method comprises the following steps that: a circulating liquid containing desulfurizing bacteria is sprayed down by a spraying head at the top part of a desulfurization tower, methane is blown into a gas inlet pipe from the lower part of the desulfurization tower, and is fully contacted with the circulating liquid in the middle filler, the desulfurizing bacteria contained in the circulating liquid oxidizes and removes hydrogen sulfide in the methane by the action of biological oxidation, wherein 2.0-2.5L methane liquid is added into each cubic meter of circulating liquid every day. The methane biodesulfurization method has the characteristics that the control is convenient, the operation is simple, and the desulfurization efficiency is high.