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596 results about "Sulphate reduction" patented technology
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SRB are capable of causing severe corrosion of iron material in a water system because they produce enzymes which have the power to accelerate the reduction of sulphate compounds to the corrosive hydrogen sulphide, thus SRB act as a catalyst in the reduction reaction. SRB occur naturally in surface waters, including seawater.
Apparatus for on-site production of nitrate ions
InactiveUS7514058B1Enhanced overall recoveryWater treatment parameter controlWater treatment compoundsMicrobial enhanced oil recoverySulfate-reducing bacteria
An apparatus and method produces nitrate ions on-site from water, natural gas and air extracted in proximity to the apparatus. The apparatus generates nitrate ions and brings the nitrate ions into contact with an aqueous system. Hydrogen sulfide present in the aqueous system is removed and the production of hydrogen sulfide by sulfate-reducing bacteria (SRB) is eliminated by introducing into the system nitrate ions, whereby denitrifying microorganisms, using nitrate, outcompete the sulfate-reducing bacteria for the available carbon nutrients, thus preventing the SRB from producing hydrogen sulfide. Nitrate ions generated by the apparatus and added to the aqueous system which contains the denitrifying microorganisms can enhance oil recovery by means of microbial enhanced oil recovery mechanisms.
Owner:NITRA GEN LLC
Method for restoring mine entironment
InactiveCN101037268ALow costLow infrastructure costWaste water treatment from quariesWater contaminantsEcological environmentSulfate-reducing bacteria
A method of repairing mine ecological environment comprises the treatment of mine environment contamination, wherein the tailings, the barren rock, the smelting slag, the waste water from ore cleaning, the waste water from smelting, the acid mine drainage and the ore yard leachwater which are generated from mine development are collected into the tailings storage, at the same time, sludge and organic matter capable of being degradated by microbiology are added therein, and then the tailings storage is given an anaerobic environment artificially, so that, under the action of microbiology and sulfate reducing bacteria, sulfur ion is generated and the pH value of the tailings storage is increased, a plurality of heavy metal ions are cured and settled by sulfur ion to avoid migration, a biomembrane layer-sulfate reducing bacteria reducing-induction biomineralization precipitation composite geochemical barrier is generated in the tailings storage. The repairing of mine ecological environment is realized by the treatment of mine environment contamination. The present invention can be used for tailings storage pollution prevention in tour, and can be used for closing the repairing of mine ecological environment, or can be used for designing new tailings storage by using the technology of the present invention.
Owner:ELION ECOLOGICAL RESTORATION
Method for removing nitrate nitrogen from aquaculture water
InactiveCN101200332AImprove effluent qualityEasy working condition controlTreatment with anaerobic digestion processesDevice formBiodegradable polymer
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.
Owner:SHANGHAI FISHERIES UNIV
Use of prokaryote viruses to remediate bio-fouling
InactiveUS8252576B2Extended service lifeLower cost of capitalBacteriaArchaeabacteria virusesProkaryote organismsSulphate reduction
Owner:PHAGE BIOCONTROL RES
Biological Clean Fuel Processing Systems and Methods
InactiveUS20120003705A1Reduce carbon emissionsImprove planting efficiencyBacteriaBiofuelsSulfate-reducing bacteriaFuel treatment
Methods and systems to achieve clean fuel processing systems in which carbon dioxide emissions (1) from fossil fuel consumption sources (2) may be processed in at least one processing reactor (4) containing a plurality of chemoautotrophic bacteria (5) which can convert the carbon dioxide emissions into biomass (6) which may then be used for various products (21) such as biofuels, fertilizer, feedstock, or the like. Sulfate reducing bacteria (13) may be used to supply sulfur containing compounds to the chemoautotrophic bacteria (5).
Owner:WESTERN RES INST INC
Compositions for removing hydrocarbons and halogenated hydrocarbons from contaminated environments
InactiveCN1668535AReduce concentrationLow costOther chemical processesWater treatment compoundsSorbentSulfate
The invention provides a bioremediation composition for in situ bioremediation of soil and / or groundwater contaminated with hydrocarbons, comprising an adsorbent capable of adsorbing said hydrocarbons, a mixture of facultative anaerobes capable of metabolizing said hydrocarbon under sulfate-reduction conditions, a sulfate-containing compound that releases sulfate over a period of time, and a nutrient system for promoting growth of said anaerobes, wherein said nutrient system includes a sulfide scavenging agent.
Owner:REMEDIATION PROD INC
Method for treating heavy metal-containing acidic waste water and recycling heavy metal with biomass fixed bed
InactiveCN101402491AWide variety of sourcesIncrease loadBiological water/sewage treatmentSulfate-reducing bacteriaSludge
The invention discloses a method for treating acidic waste water containing heavy metal and reclaiming the heavy metal through a biomass fixed bed, which is characterized in that dry solid biomass capable of being decomposed by microbes is granulated and filled into a container with a supporting layer and a water distributing device so as to form a fixed bed microbe reactor; sewage disposal plant sludge containing sulfate reducing bacteria is taken as the source of microbe bacteria on the fixed bed, and the microbes are cultured, proliferated and acclimated to adapt to the environment of the biomass filler fixed bed through the backflow circulation of the outputted water or taking ferrous sulfate aqueous solution as the inputted water; acid effluent containing heavy metallic ions is led into the fixed bed for direct filtration; and when the water filtering speed can not meet the preset requirements, the operation is stopped, substances in the fixed bed are taken out, the heavy metal is reclaimed through smelting, and the fixed bed microbe reactor is refilled. The method is suitable for waste water containing Cr2O7 <2->, AsO3 <2->, Cu <2+>, Hg <2+> Ag <+>, Cd <2+> and the like. The method can be used for reclaiming the valuable metal resources with low waste water treatment cost.
Owner:HEFEI UNIV OF TECH
Sulfate reducing bacteria-phosphate solubilizing bacteria and application thereof in combined remediation of cadmium contaminated soil
ActiveCN104450552AIncrease productionImprove securityBacteriaContaminated soil reclamationSulfate-reducing bacteriaPhosphate
The invention discloses a bacterial strain b capable of resisting the growth of heavy metal Cd and reducing sulfate, and a bacterial strain capable of resisting the growth of the heavy metal Cd and solubilizing phosphate. The classification and name of the bacterial strain b and the bacterial strain are respectively enterbacter ludwigii SRB-2-5U-2 and pseudochrobactrum saccharolyticum LB-4-4-1c, which are already preserved in the Common Microbe Center of the China Committee for Culture Collection of Microorganisms. The bacterial strains disclosed by the invention can be used for simultaneously remediating the surface soil, deep soil and rhizosphere soil of a plant, reducing the pollution of Cd to surface water and underground water, and also improving the activity and fertility of the soil.
Owner:西安金博瑞生态科技有限公司
Inhibition of biogenic sulfide production via biocide and metabolic inhibitor combination
ActiveUS20050238729A1Inhibit productionInhibit sulfide productionHeavy metal active ingredientsBiocideSulfide productionSulfate-reducing bacteria
Biogenic sulfide production is synergistically inhibited by treating sulfate-reducing bacteria (SRB) with a biocide and a metabolic inhibitor. The biocide directly kills a first portion of the SRB. The metabolic inhibitor inhibits sulfate-reducing growth of a second portion of the SRB without directly killing the second portion of the SRB. The treatment of SRB with both a biocide and a metabolic inhibitor provides effective biogenic sulfide inhibition at significantly lower concentrations than would be required if the biocide or metabolic inhibitor was used alone.
Owner:UNIV TECH INT +1
Method for simultaneously removing SO2 and NO in flue gas by biological reduction and complexing absorption
ActiveCN101327397AAchieve governanceReasonable workmanshipDispersed particle separationAir quality improvementAnaerobic reactorPhotochemistry
The present invention belongs to the smoke purification technical field, and discloses a method for deoxidizing integrating, complexing and absorbing the organism and removing SO2 and No in the smoke, which is characterized in that alkaline absorption solution containing the ferrous-iron complexing agent Fe<II>(L) is arranged inside an absorption tower; SO2 is neutralized in the absorption solution, and NO is absorbed by the complexing iron; the smoke is exhausted from the top of the absorption tower; the absorption tail solution enters into an anaerobic reactor, and SO3<2> or SO4<2> in the tail solution is deoxidized to sulfide by sulfate reducting bacteria; the sulfide deoxidizes Fe<II>(L)-NO, Fe<III>(L) and other N-S compound in the tail solution to Fe<II>(L) and N2; at the same time, the sulfide is oxidized to simple sulfur; the absorption tail solution containing the Fe<II>(L) is directly returned to the smoke absorption tower to be used as desulphurization denitration absorption solution. The method of the present invention has the advantages that the micro-organism smoke desulphurization method and the complexing absorption smoke denitration method are combined, so that the sulfur dioxide and the nitrogen oxide can be synchronically removed, and the sulfur resource can be recycled; the complexing iron absorption agent can be cycled for use.
Owner:DALIAN UNIV OF TECH
Method for increasing waste water treating efficiency by improving activity of sulfate reducing bacteria
InactiveCN1458083ARaise the pHImprove adaptabilityTreatment with anaerobic digestion processesWater/sewage treatment by neutralisationSulfate-reducing bacteriaHigh activity
The present invention belongs to the waste water treating technology utilizing sulfate reducing bacteria. Upwards flowing anaerobic composite bed bioreactor and mixed sulfate reducing bacteria are used in treating acid waste water containing Cr2O72-, CrO42-, Cu2+, Zn 2+, Mn2+ and other heavy metal ions. The present invention has high activity of sulfate reducing bacteria and high waste water treating efficiency. The present invention features that inside the reactor or waste water tank, simple substance iron is added to result in waste water pH value of 5.5-8.5, and that the biochemical reaction is performed at 25-30 deg.c. The present invention has the advantages of addition of simple substance iron, raised waste water pH value, improved bacteria living environment, high metabolic activity of the bacteria, reinforced capacity of the sulfate reducing bacteria, raised bacteria adaptability and waste water treating capacity.
Owner:TIANJIN UNIV
Device and method for comprehensively treating acidic sulfate organic waste water based on biological desulfurization
InactiveCN102795739AAchieving processing powerFacilitate conversion and strippingMultistage water/sewage treatmentWater basedSulfate-reducing bacteria
The invention belongs to the field of environmental engineering, and in particular relates to a device and a method for comprehensively treating acidic sulfate organic waste water based on biological desulfurization. The method comprises the following steps of: 1, reducing sulfate in the organic waste water, blowing hydrogen sulfide off, namely (1-1) mixing the acidic sulfate organic waste water and sulfide-containing recirculation water in an anaerobic digestion reactor, controlling the pH of the mixture to be 5.0 to 6.0, and thus obtaining a hydrogen sulfide-containing acidic mixed solution, and (1-2) introducing inert gas, blowing the hydrogen sulfide off, adding sulfate reducing bacteria, reducing the sulfate to form sulfide, obtaining the sulfide-containing recirculation water and returning to the step (1-1); and 2, absorbing, oxidizing and recycling the hydrogen sulfide, namely (2-1) absorbing the hydrogen sulfide blown off in the step (1-2) by using a weak alkaline solution, adding sulfur-oxidizing bacteria, oxidizing the hydrogen sulfide to form elemental sulfur, separating to obtain the elemental sulfur and effluent, and (2-2) treating the effluent for recycling. By the device and the method, sulfate innocent treatment and resource recovery treatment are realized.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI
Microorganism for controlling harm of oil field sulfate reductive bacterium and application thereof
InactiveCN1920004AReduce corrosion costsEliminate pollutionBacteriaBiological water/sewage treatmentMetaboliteDenitrifying bacteria
The invention relates the microorganism agent used to control oil field sulfate-reducing bacteria and its application. The invention can used to control oil field secondary depletion sulfate-reducing bacteria and microorganism. The water outlet system of secondary depletion technology comprises sulfate-reducing bacteria, H2S and sulphide, which can cause corrosion and pollution of sulphide. Microorganism agent comprises denitrifying bacteria culture, nutrescin and synergic nutrescin. 0.01-1wt% denitrifying bacteria culture, 5-100g / L culture and 10-200ppm synergic nutrescin. Microorganism agent can avoid SRB growing, SRB producing H2S, and removing sulphide. At the same time, metabolite can improve recovery efficiency.
Owner:SHENYANG INST OF APPL ECOLOGY CHINESE ACAD OF SCI
Acidophilus sulfate reducing bacterium strain and application thereof
ActiveCN104630097AGood ventilationEasy to trainBacteriaMicroorganism based processesMicroorganismSulfate
The invention discloses an acidophilus sulfate reducing bacterium strain FKB and a method for acidification control with the strain. The acidophilus sulfate reducing bacterium strain FKB is desulfospornosinus sp, and is preserved at the China General Microbiological Culture Collection Center (CGMCC for short) on November 27, 2014; and the preservation number is CGMCC No.10072. The strain is prepared into a liquid microbial inoculum after fermentation culture; and soil is simply improved with lime, chicken manure, a phosphate fertilizer and the like and then the liquid microbial inoculum can be used together with a plant stabilizing technology to perform the acidification control on soil of mining wastelands such as refuse dumps and tailings ponds; and the targets of acidification restraint, ecological regreening and mine land rehabilitation are reached.
Owner:SHAOGUAN TAOLIN GREEN TECH
Method for strengthening indigenous microbes and improving oil recovery by improving microbial florae in oil deposit
The invention provides a method for strengthening indigenous microbes and improving oil recovery by improving microbial florae in an oil deposit. The method comprises the following steps of: (1) analyzing composition of microbial florae in the oil deposit; and (2) introducing exogenous microbes into the oil deposit according to an analysis result, so that the oil deposit with the introduced exogenous microbes contains the following microbes: hydrocarbon-oxiding bacteria, fermentative bacteria, heterotrophic bacteria, methanogenic bacteria, sulphate-reducing bacteria, and nitrate-reducing bacteria. Due to the adoption of the method provided by the invention, by adding the exogenous microbes into the oil deposit, the structure of the microbial florae in the oil deposit is improved, the function of the microbial florae in the oil deposit is strengthened, as a result, the oil displacement effect is improved, and the application range of microbial oil recovery technology is enlarged.
Owner:INST OF MICROBIOLOGY - CHINESE ACAD OF SCI
Chemical control method for corrosion microorganism in pipeline conveyance system and product
InactiveCN101244856AEffective eradicationLow costScale removal and water softeningWater/sewage treatment using germicide/oligodynamic-processSulfate-reducing bacteriaChemical control
The invention relates to three compound stabilizer reagents which can effectively protect various water pipelines, water containers and the relevant equipment of the water conveyance system from biodeterioration or scaling and the treatment method and the utilization of the biodeterioration. Particularly, by utilizing the three compound stabilizer reagents acting on the water conveyance system in different period respectively, the addition dosage and the time can change according to different water quality, different microorganism pollution degree and different water treatment demand, wherein each compound stabilizer reagent main component has different sterilization mechanisms and the emphases of the reagent is also different, so that serious corrosion caused by the drug resistance of the bacteria can be solved and the sulfate reducing bacteria, the saprophyte, the iron bacteria, the nitrite bacteria, the ammonium bacteria and algae in the water conveyance system can be completely killed. The compound stabilizer reagents is suitable for the control of pipeline scaling and the pipe wall biodeterioration of the oil field water injection system, the circulating water system and the central air-conditioning cooling water system.
Owner:WUHAN TEXTILE UNIV
Odor control
InactiveUS7160712B2Reduce and eliminate odorWater treatment parameter controlSpecific water treatment objectivesSynechococcusOxygen
Owner:NOVOZYMES AS
Method for treatment of metal waste water by sulfate reducing bacteria growing up with electric current
InactiveCN102642930AAvoid secondary pollutionEasy to operateWaste water treatment from quariesWater contaminantsSulfate-reducing bacteriaPollution
The invention belongs to the technical field of treatment of waste water, and particularly relates to a method for reduction of sulfate into sulfide and treatment of metal waste water by sulfate reducing bacteria growing up with electric current. The sulfate reducing bacteria provided by the invention is a mixing bacteria group, which comprises Desulfobulbus propinonicus, geobacter sulfurreducens. Under the condition of lacking organic carbon resource, an electrode is used as the only electronic donator for growing, sulfate is reduced into sulfide via bioelectrical chemistry, and the sulfide is applied to the treatment of metal waste water. According to the method provided by the invention, the defect that organic carbon resource is needed to be used as the electronic donator is overcome,the operation is simple, the secondary pollution is zero, the cost is low, and is particularly suitable for the treatment on organic carbon metal waste water of mine waste water, metal smelting wastewater, electric plating waste water and the like.
Owner:CHENGDU INST OF BIOLOGY CHINESE ACAD OF S
Anti-bacterial anti-corrosive coating material for inner wall of oilfield reinjection water pipeline
The invention relates to an anti-bacterial anti-corrosive coating material for the inner wall of an oilfield reinjection water pipeline, comprising solvent-free organic fluorine modified epoxy resin as base material and hybridized organic-inorganic fungicide and filling materials, etc. The coating material has good anti-bacterial performance and anti-corrosive performance, and has good self-cleaning and antisetoff performance. The coating material has good workability, and can be used on wet metal surface. The coating material has fast drying speed, good thoughness and rigidity, good adhesiveforce with the base coat,and flat and smooth film. The coating material has good bactericidal effect on sulfate reducing bacteria, iron bacteria and the like, good broad-spectrum bactericidal action,fast sterilization speed, high sterilization efficiency, no pollution to the environment, and no toxicity to human body.Thereby, the coating material has a wide application prospect.
Owner:SINOPEC PETROLEUM ENG DESIGN
Nutrient for inhibiting sulfate reducing bacteria in oilfield water and application of nutrient
ActiveCN101746897ALow costThe implementation process is simpleWaste based fuelTreatment with anaerobic digestion processesPhosphateSulfate-reducing bacteria
The invention relates to a nutrient for inhibiting sulfate reducing bacteria in oilfield water and application of the nutrient. The nutrient contains the following components by weight percent: 20-95 percent of cane molasses or beet molasses, and / or 1-45 percent of ammonium phosphate, and / or 0.5-10 percent of ammonium chloride, and / or 0.5-2.5 percent of ammonium sulfate, and / or 1-18.5 percent of ammonium nitrate, and / or 0.05-49 percent of sodium nitrate; and / or 0.05-1 percent of diammonium hydrogen phosphate, and / or 0.05-1.2 percent of disodium hydrogen phosphate, and / or 0.5-2 percent of dipotassium phosphate and / or 0.05-1.5 percent of potassium dihydrogen phosphate. The nutrient with weight accounting for 0.5-5 percent of weight of filled water is taken, is dissolved by using constructional injection water or oilfield surface water and is squeezed into stratum by a pump truck through a water injection well. The nutrient can activate nitrifying bacteria flora in source bacteria flora of stratum water or oilfield source water and can inhibit the growth of sulfate reducing bacteria. After 16 hours to 52 days, the content of sulfate reducing bacteria is 0-102 / mL. The yield of crude oil is increased by 10 percent to 30 percent.
Owner:PETROCHINA CO LTD
Method for removing carbon, nitrogen and sulfur in waste water
ActiveCN102745868AImprove biodegradabilityHigh removal rateWaste based fuelTreatment with anaerobic digestion processesSequencing batch reactorChemical oxygen demand
The invention belongs to the technical field of waste water treatment and relates to a process method for conducting removal treatment on waste water containing carbon, nitrogen and sulfur, in particular to a method for removing the carbon, the nitrogen and the sulfur in the waste water. The method comprises five processing steps of oxidation treatment, neutralization sediment, sulfate reduction,methane generation and deep treatment by a sequencing batch reactor. Firstly ferrite and hydrogen peroxide are added in the waste water to conduct redox to obtain first-class effluent after being mixed, then alkali is added to conduct coagulating sedimentation to remove organic matters to obtain second-class effluent, a two-phase anaerobic process is introduced to conduct sulfate reductive treatment, methane generation treatment is carried out to obtain energy methane raw materials and fourth-class effluent, and finally the deep treatment is carried out on the fourth-class effluent by using the sequencing batch reactor, and purified effluent is obtained through treatments of an aerobic process and an anaerobic process. The method is strong in practical applicability, safe and stable in operation and good in treatment effect, chemical oxygen demand and removal rates of ammonia nitrogen and sulfate are more than 95%, and the effluent quality reaches the standard.
Owner:长沙市凌志环保设备有限公司
Method for biological treatment of sulfate wastewater employing synchronous electric catalysis of anode and cathode
ActiveCN103319002AImprove the reduction of SO
<sub>4</sub>
<sup>2-</sup>
rateReduce consumptionTreatment with aerobic and anaerobic processesSulfate-reducing bacteriaSulfur
The invention provides a method for biological treatment of sulfate wastewater employing synchronous electric catalysis of an anode and a cathode. The method comprises the following concrete steps of: (1) building an electric catalytic bioreactor, which includes a cathode reaction zone, a buffer zone and an anode reaction zone; (2) inoculating mixed bacteria of sulfate reducing bacteria inside the cathode reaction zone, leading to a culture medium, electrifying and acclimatizing, and cultivating for 3-5 days at 28-34 DEG C, so as to achieve cathode hanging membrane of the sulfate reducing bacteria; (3) inoculating sulfur-oxidizing bacteria inside the anode reaction zone, leading to the culture medium to cultivate for 5-7 days at 25-30 DEG C; and (4) starting a reactor, leading the sulfate wastewater to the cathode reaction zone of the reactor, and enabling the sulfate wastewater to flow out of the reactor after flowing inside the anode reaction zone through the buffer zone. By adopting the method, control of an S<2->oxidization process is achieved when the reduction speed of the sulfate reducing bacteria for reducing SO4<-2> is improved. Thus, the yield of S produced by biological metabolism of the wastewater is improved.
Owner:INST OF PROCESS ENG CHINESE ACAD OF SCI
Nutrient source immobilized sulfate reducing bacterium globules as well as preparation method and application thereof
InactiveCN106636057ALarge specific surface areaLow priceWater contaminantsOn/in organic carrierWater bathsCross-link
Owner:HUNAN UNIV
System and methods for biological selenium removal from water
A biological system for removing selenium from waste water comprises a first immobilized cell bioreactor (ICB) and a selenide removal module. The first ICB comprises a chamber having a substrate housed therein and situated to contact the waste water flowing therethrough during use. Anaerobic microorganisms are supported on the substrate, and comprise selenium respiring bacteria capable of reducing selenates and selenites to insoluble elemental selenium and / or sulfate reducing bacteria capable of reducing selenates and selenites to insoluble elemental selenium or to soluble selenides. The selenide removal module includes metallic or oxidized iron compounds capable of chemically reacting with selenide or sulfide compounds in the waste water to form iron selenide or iron sulfide precipitates.
Owner:UOP LLC
Method and apparatus for removing sulfate in high-salt petrochemical wastewater
ActiveCN103771670AImprove biodegradabilityImprove dehydration effectSludge treatmentTreatment with aerobic and anaerobic processesSulfate-reducing bacteriaSludge
The invention relates to a removing method and a removing apparatus for sulfate in high-salt petrochemical wastewater, and belongs to the technical field of wastewater treatment. According to the present invention, in order to provide a method with characteristics of low cost, simpleness, convenience and high sulfate removal rate, and an apparatus thereof, according to the principle of conversion of sulfate into hydrogen sulfide with sulfate reducing bacteria, residual sludge produced by a high-salt petrochemical wastewater treatment system precipitation tank is subjected to ultrasonic wave degradation through an ultrasonic wave treatment, the obtained sludge or sludge supernatant and high-salt petrochemical wastewater are mixed, and then enter an anoxic tank or anaerobic tank so as to provide a carbon source for the sulfate reducing bacteria, and a blowing removing manner under a N2 solution is adopted to remove the hydrogen sulfide so as to reduce inhibition effects of hydrogen sulfide and other sulfides on the sulfate reducing bacteria; and the sulfate reduction can be effectively promoted, the sulfate removal rate can be increased, the calcium sulfate scaling tendency can be reduced, the maintenance period and the service life of the equipment can be prolonged, and the system stability is increased.
Owner:CHINA PETROLEUM & CHEM CORP
Dissimilatory sulfate reduction as a process to promote denitrification in marine recirculating aquaculture systems
InactiveUS7462284B2Promote autotrophic denitrificationPromote dissimilatory sulfate reductionWater treatment parameter controlWater contaminantsHigh concentrationSludge
Owner:UNIV OF MARYLAND BALTIMORE COUNTY
Process for treating acid wastewater in mine and reclaiming valuable metals in wastewater
InactiveCN101746918AReduce inhibitionReduce consumptionWater/sewage treatmentMultistage water/sewage treatmentPhase splittingSulfate
The invention provides a process for treating acid wastewater in a mine and reclaiming valuable metals in the wastewater. The process comprises the following steps: (1) introducing the acid wastewater to a plurality of contact reactors in sequence and subsequently to a sulfate-reducing bioreactor; (2) through the control of return flow rate of a post-stage reactor, realizing the operation of each contact reactor in different pH, precipitating different metals; and (3) adopting food processing wastewater with the COD concentration of between 10,000mg / L and 100,000mg / L as a carbon source, and introducing the food processing wastewater to the sulfate-reducing bioreactor. In the process, the Cu2+removing rate in the acid wastewater of the mine reaches 99 percent, the Fe2+removing rate reaches 95 percent, the Fe3+removing rate reaches 90 percent, the pH of the processed wastewater is neutral, and the wastewater reaches the standard and can be discharged. The process has the advantages of utilizing the organic wastewater with the COD concentration of between 10,000mg / L and 100,000mg / L as the carbon source to reduce the cost of the carbon source, utilizing the design of phase splitting to reduce the inhibition of metallic ions to the wastewater, adopting return flow to reduce the inhibition of S2-ions to bacteria, and controlling the return flow rate to realize the selective precipitation of various valuable metals of the wastewater in each contact reactor on. The whole process can reduce the operating cost by 30 to 50 percent.
Owner:GENERAL RESEARCH INSTITUTE FOR NONFERROUS METALS BEIJNG
Oil field sewage bactericide and preparation method thereof
ActiveCN103478164ALarger than surfaceImprove adsorption capacityBiocideDisinfectantsSulfate-reducing bacteriaIron bacteria
The invention discloses an oil field sewage bactericide and a preparation method thereof, belonging to the technical field of chemical agents for oil fields and preparation thereof. The oil field sewage bactericide is prepared by mixing the following components in percentage by mass: 10-15% of nano titanium dioxide powder, 0.5-2% of crosslinking agent, 5-10% of surfactant, 5-10% of oxidizer and the balance of water. The bactericide can be deposited on pipe walls, bent angles and other parts along with a liquid flow; a main agent can be slowly diluted out, has persistent chemical action and causes no corrosion to pipelines; the comprehensive sterilizing rate of the bactericide with respect to sulfate reducing bacteria, saprophytic bacteria and iron bacteria can be still up to 90% or above 18 days after filling; and the filling period of the chemical agent is 15-25 days which is 10-15 times longer in comparison with a common chemical agent, thereby greatly relieving the operation intensity and lowering the cost.
Owner:CHINA PETROLEUM & CHEM CORP +1
Biological desulfurizing device for transforming sulfur-containing compound to elemental sulfur
InactiveCN101037271AAvoid pollutionRealize resourcesTreatment using aerobic processesWater contaminantsSulfateTower
An apparatus is provided for removing smoke, composition containing sulfur in waste water and recycling simple substance sulfur by effective biology reactor and integrated autocontrol. A desulfurizing apparatus is mainly composed of SO2 absorbing tower, sulfate deoxidized anaerobic reactor, H2S tourill, simple substance sulfur generating reactor, sulfur precipitation tank, cycle pump, filter press and sulfur storage pot.
Owner:阮文权 +2
Method and device for treating oily sludge
InactiveCN102001806AImprove qualityQuickly break down complex structuresSludge treatment by oxidationElectrochemical responseMicro bubble
The invention relates to a method and a device for treating oily sludge. Under the action of an applied electric field and by adopting an electrochemical oxidation method, the oil-in-water and water-in-oil structure of emulsified oil is quickly broken, and the oily sludge serving as an electrolyte releases oil drops; oil is quickly taken by a large number of micro bubbles to the liquid level to be recycled under the action of applied air flotation; oily sludge flocs are subjected to electrochemical reaction on the surface to produce various active free radicals which have high activity and oxidability and mainly comprise hydroxyl, and organic pollutants are degraded to be converted into water and carbon dioxide; the active free radicals can destroy a microbial cell structure and kill sulfate reducing bacteria and saprophytic bacteria through a series of oxidation chain reactions; the sludge is powerfully dehydrated, so that the water quality of dehydrated water meets the water quality standard of oil field reinjection, and the sludge can be recycled; and a mud cake is nontoxic and harmless and can be used for soil improvement, fertilizers, building materials and the like.
Owner:朱同德 +1
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