20 results about "Sulphate reduction" patented technology

The invention relates to an anaerobic sulfate reduction biological bed reactor for removing multiple pollutants. The anaerobic sulfate reduction biological bed reactor comprises a multilayer anaerobic sulfate reduction biological reactor main body, a reflux system, a feeding system and a backwashing system. A coupling process of a reflux system and an adjusting sedimentation tank is designed in the reactor, and sulfur ions generated in effluent of the reactor flow back to the front end and react with heavy metals in inflow in advance to generate precipitates and separate the precipitates. Meanwhile, the iron-based enhancer with ferrous sulfide as a main component is obtained by reacting part of effluent of reflux with ferrous sulfate, and the reactor is enhanced by adopting different modes according to the water quality condition of the inlet water, so that the removal effect is improved. According to the strategy, the operation cost is reduced, more importantly, before the wastewater enters a biological reaction core area, toxicity inhibition of heavy metal on functional microorganisms is eliminated, and the problem of system collapse caused by the heavy metal in a traditional one-step method is solved.

The invention relates to a method for in-situ remediation of hexavalent chromium contaminated soil and application of the method, according to the method, a nutritional additive solution and a sulfate reduction biological agent are added into the hexavalent chromium contaminated soil, and a nutritional additive contains organic acid salt. According to the method, the organic acid salt serves as a chelating agent to enable insoluble hexavalent chromium to be dissolved out of soil particles, meanwhile, the organic acid salt serves as a nutrition additive to promote reproduction and growth of sulfate reducing bacteria, sulfate is reduced into negative bivalent sulfur through the sulfate reducing bacteria, and the dissolved hexavalent chromium is reduced into trivalent chromium through the negative bivalent sulfur; finally, the purpose of treating the hexavalent chromium contaminated soil is achieved.

The embodiment of the utility model provides acid mine wastewater treatment equipment. The acid mine wastewater treatment equipment comprises a reactor and a gas supply device, the reactor comprises a container and a membrane assembly arranged in the container, the membrane assembly is used for attaching a biological membrane and provided with a gas inlet, and the gas supply device is communicated with the gas inlet of the membrane assembly and used for supplying a gaseous electron donor to the membrane assembly. According to the acid mine wastewater treatment equipment disclosed by the embodiment of the utility model, the biological activity of sulfate reducing bacteria is relatively strong, the sulfate reducing efficiency is relatively high, metal precipitates are easy to precipitate and collect, and the difficulty and the cost of callback to neutrality are relatively low and even callback to neutrality is not needed.

The invention discloses a method for evaluating the potential of oil reservoir resource transformation through a thermochemical sulfate reduction reaction. The evaluation method comprises the following steps: simulating a process that crude oil is transformed by a thermochemical sulfate reduction reaction in a magnesium sulfate aqueous solution environment; performing quantitative analysis on all phase-state main organic-inorganic products in the reacted product, and establishing a thermochemical sulfate reduction reaction modified crude oil substance balance model through the relationship between the weight production rate of the organic-inorganic products and the reaction time; the evolutionary process of recoverable oil and gas resources in different stages of transformation of crude oil by the thermochemical sulfate reduction reaction is obtained, and the quantity and composition of the recoverable oil and gas resources in different stages of transformation of the thermochemical sulfate reduction reaction are evaluated, so that the resource potential of oil reservoirs transformed by the thermochemical sulfate reduction reaction is evaluated. The evaluation method provided by the invention reflects the dynamic evolution process of the TSR reformed oil reservoir so as to evaluate the resource potential of the deep TSR reformed oil reservoir, and a reasonable and scientific basis is provided for deep oil-gas exploration.

The application discloses a method for realizing simultaneous denitrification and desulfurization by coupling sludge incineration flue gas and sludge drying condensate water, which comprises the following steps: carrying out oxidation treatment on the dust and ash removed incineration flue gas by ozone oxidation; using sludge drying condensate water anaerobic digestion effluent as the only absorption liquid to absorb the incineration flue gas, so that NO x and SO x in the flue gas are transferred to the liquid phase; the absorption liquid is introduced into a short-cut denitrification reactor, and short-cut denitrification anaerobic ammonia oxidation and sulfate reduction anaerobic ammonia oxidation are utilized to realize simultaneous denitrification and desulfurization. The application realizes flue gas desulfurization and denitrification and sludge drying condensate water denitrification by coupling the incineration flue gas and the sludge drying condensate water and utilizing anaerobic ammonia oxidation and sulfate reduction anaerobic ammonia oxidation, and the reagent adding and operation cost are greatly saved.

The invention discloses a self-purification prediction simulation method for a petroleum hydrocarbon polluted site under soil-water interaction based on COMSOL Multiphysics, and the method comprises the steps: obtaining historical meteorological data, and constructing a rainfall flux simulation process through a function; taking the rainfall flux as an upper boundary source item for driving the three-phase fluid to move, and constructing a three-phase fluid motion model; simulating and predicting a migration path and a phase transformation process of the dissolved phase petroleum hydrocarbon in a water phase; constructing a migration path of an electron acceptor and a migration path of gas-phase oxygen, establishing a degradation kinetic model of each path, calculating a total biodegradation flux through aerobic degradation, nitrate reduction degradation and sulfate reduction degradation, and correcting the degradation kinetic models of the paths by using correction factors; biodegradation flux and a three-phase fluid motion model are coupled, rainfall flux is constructed through a piecewise function and annual rainfall data and is directly associated to core parameter soil water phase pressure, and the physical consistency of a driving mechanism is enhanced.

This disclosure relates to systems for wellbore drilling and methods for preparing wellbore drilling fluid. The system can include a drilling fluid tank that holds wellbore drilling fluid for introduction into a wellbore, an additive distribution component fluidly coupled to the drilling fluid tank that holds a first additive, and a computing device communicatively coupled to the additive distribution component. The methods can include a computing device performing at least the following: receiving drilling parameters that identify wellbore drilling conditions of a wellbore drilling system, calculating a thermochemical sulfate reduction (TSR) proxy value of the wellbore. In response to determining that a predicted hydrogen sulfide concentration meets a predetermined threshold, the computing device can determine a first quantity of a first additive to be added to the wellbore drilling fluid and combine the first quantity of the first additive with the wellbore drilling fluid.

This invention discloses a process and system for treating low C / N wastewater using heterotrophic denitrification coupled with sulfur autotrophic denitrification, comprising the following steps: S1. Deoxygenating the low C / N wastewater with a first biogas to obtain deoxygenated wastewater; S2. Treating the deoxygenated wastewater with the first biogas slurry using heterotrophic denitrification to obtain heterotrophic denitrified wastewater; S3. Treating the heterotrophic denitrified wastewater with sulfur autotrophic denitrification to obtain sulfur autotrophic denitrification wastewater; S4. Treating the sulfur autotrophic denitrification wastewater, a second biogas, and a second biogas slurry with heterotrophic sulfate reduction and stripping to obtain a hydrogen sulfide-containing aqueous solution; S5. Performing biological desulfurization on the hydrogen sulfide-containing aqueous solution to obtain effluent. This application combines sulfur autotrophic denitrification with heterotrophic denitrification, utilizing the alkalinity generated by heterotrophic denitrification to supplement the alkalinity consumed by sulfur autotrophic denitrification, providing a wastewater treatment process that is simple to operate, produces no sulfides, and yields compliant effluent.

Method for microbial in-situ treatment and in-situ remediation for the sustainable immobilization of inorganic pollutants in contaminated waters, surrounding aquifer areas and zones, and extraction residues by sequencing and controlling activated natural mineral formation processes, characterized in that a buoyant reactive material is introduced into the contaminated waters, surrounding aquifer areas and zones, and extraction residues as bulk material and / or by controlled flushing as a solid-water mixture via naturally occurring hydraulic connections and / or engineered inlets and outlets with technical systems and equipment, wherein the reactive material consists of a buoyant solid carrier material in the form of a foam glass substrate made of glass powder and blowing agent.with a silicate coating consisting of hydrogen-releasing and / or sulfate-reduction-promoting substances and at least one additive homogeneously embedded in the silicate coating, and the silicate coating of the reactive material stimulates the metabolic processes of autochthonous sulfate-reducing microorganisms by reducing site-specific and / or supplied sulfate to sulfide, and sulfide formation and gradual surface oxidation of formed sulfides occur on the floating reactive material through oxygen present from inflowing groundwater or through the gradual supply of oxygen via technical systems and facilities for the formation of pyrites and iron oxides through gradual surface oxidation on the floating reactive material, wherein hydrogen is released at rates of 0.0005 mol / kg*d to 0.0005 mol / kg*d during contact of the reactive material with the polluted waters.0.5 mol / kg*d is released and autotrophic microbial sulfate reduction is stimulated with reduction rates of 0.75 mg / l*d to 70 mg / l*d.

The application discloses a method for two-stage prediction and optimization of process performance of sulfur circulation coupled denitrification phosphorus removal, comprising: first, preparing data sets for sulfate reduction amount and phosphorus removal rate respectively; in the first stage, taking anaerobic stage process parameters as input, selecting machine learning algorithm, cross-validation method and search method to realize prediction of sulfate reduction amount; in the second stage, taking anoxic stage process parameters and sulfate reduction amount prediction value as input, selecting machine learning algorithm, cross-validation method and search method to realize prediction of phosphorus removal rate; in the model training process, the model is evaluated through the coefficient of determination R 2 and the root mean square error RMSE, and the optimal model is selected according to the evaluation result. According to the optimal model, a scheduling platform is built, and performance prediction and optimization control of the sulfur circulation coupled denitrification phosphorus removal system are realized according to the scheduling platform.

This application relates to the field of acidic mine wastewater treatment and sulfide resource recovery technology, specifically providing a method and system for hydrogen-driven synergistic biological treatment of acidic mine wastewater and sulfide resource recovery. The method includes: introducing acidic mine wastewater into an HSR-MBR unit; under anaerobic conditions with hydrogen as the sole external electron donor, reducing sulfate to sulfide ions and generating alkalinity through hydrogen autotrophic sulfate-reducing bacteria; and the sulfide ions reacting with Fe... 3+ The biofilm reacts with other heavy metal ions to form insoluble heavy metal sulfide particles; these particles are periodically sludged off the biofilm; the treated mixture is then introduced into a solid-liquid separation unit for membrane separation to obtain purified effluent and sulfide-containing biomass retained by the membrane; all biomass rich in heavy metal sulfides is collected for resource recovery. This application achieves integrated treatment of acidic mine wastewater through "co-removal of pollutants and targeted conversion of resources" within a single system.

This invention relates to the field of wastewater treatment materials technology, and discloses a bio-iron sulfide composite packing material, its preparation method, and its application. The raw materials for preparing the bio-iron sulfide composite packing material of this invention include limestone gravel, iron hydroxyl oxide, nutrient solution I, and sulfate-reduced sludge; wherein the limestone gravel contains 70%–80% limestone by mass. This composite packing material not only has a simple preparation process, low cost, and readily available raw materials, but also allows the immobilized and adsorbed sulfate to be recycled in the secondary bio-sulfidation stage, achieving sulfur recycling and effectively avoiding secondary pollution problems caused by excessive sulfate production.

The application provides a baffle type membrane bioreactor and method for partitioned resource utilization of sulfate wastewater, and relates to the field of wastewater treatment. The reactor is divided into a sulfate reduction compartment, an anaerobic-microaerobic transition compartment and a sulfur oxidation compartment which are sequentially connected in series by a baffle plate arranged in the vertical direction. The sulfate reduction compartment is provided with a first filler area. The anaerobic-microaerobic transition compartment is provided with a gas curtain device and a second filler area from bottom to top. The sulfur oxidation compartment is provided with a third filler area and a sulfur trapping device from bottom to top. The first filler area, the second filler area and the third filler area are respectively used for filling fillers loaded with sulfate reducing bacteria, H2S adsorption fillers and fillers loaded with sulfur oxidizing bacteria. The application realizes effective separation of sulfate reducing bacteria and sulfate oxidizing bacteria in space, and overcomes the problems of poor system stability, low sulfur conversion rate and low recovery rate caused by cross interference and bacterial population inhibition in the reaction zone.

The invention discloses a wastewater treatment system and method based on sulfur recovery and denitrification, and belongs to the technical field of wastewater biological treatment. The system comprises an anaerobic reactor, a low-oxygen reactor, a primary precipitator, an aerobic-anoxic reactor and a secondary precipitator which are communicated in sequence. The method comprises the following steps: wastewater enters an anaerobic reactor for sulfate reduction; anaerobic effluent enters a low-oxygen reactor to oxidize sulfide into elemental sulfur; sulfur-containing sludge separated by the primary precipitator enters an anoxic section of the aerobic-anoxic reactor after wall breaking, and nitrate nitrogen is reduced into nitrogen by utilizing elemental sulfur and an organic carbon source in the sludge as electron donors for sulfur autotrophic denitrification and heterotrophic denitrification respectively. Through the process of anaerobic sulfur production, low-oxygen sulfur fixation and oxygen-deficient sulfur utilization, oriented conversion and resource recovery of sulfur elements are achieved, the requirement for an external carbon source is lowered, and the method has the advantages of being high in denitrification efficiency, low in sludge yield and low in treatment cost.

The invention relates to the technical field of underground water treatment, in particular to an efficient sulfate reduction complex microbial inoculant, application and a remediation method of high-concentration combined polluted underground water. The enterobacter ETL-1 strain is preserved in the China General Microbiological Culture Collection Center on July 4, 2025, and the preservation number is CGMCC (China General Microbiological Culture Collection Center) No.35106. The enterobacter ETL-1 strain is preserved in the China General Microbiological Culture Collection Center on July 4, 2025; the SRB Desulfovibrio DS-1 strain is preserved in the China General Microbiological Culture Collection Center (CGMCC) on August 21, 2025, and the preservation number of the SRB Desulfovibrio DS-1 strain is CGMCC No. 46609. The ETL-1 provides an electron donor H2 to excite the activity of DS-1, the sulfate reduction rate in polluted underground water is increased, rapid vulcanization modification of Fe reduction particles is achieved, and reducible and degradable composite pollutants such as high-concentration chlorinated hydrocarbon and hexavalent chromium are efficiently removed.

The application discloses a device and a method for degrading florfenicol by using photo-activated humic acid and biogenic sulfite, and belongs to the technical field of wastewater treatment and environmental remediation. A cylindrical hollow light reaction cage is coaxially arranged in the reactor main cavity. A plurality of holes are formed in the side wall and the bottom of the light reaction cage, and a plurality of foam ceramic plates loaded with humic acid are filled in the light reaction cage. The area between the light reaction cage and the reactor main cavity forms a sulfate-reducing sludge zone. A light-rotation-coupling central stirrer is located at the center axis of the reactor main body, is hollow, and is provided with a fiber bundle for providing light. The outer part has double-section staged stirring blades. The application realizes in-situ utilization of biogenic sulfite and degradation of pollutants, has the advantages of low energy consumption, no secondary pollution, stable operation and the like. The core of the application is to construct a coupling reaction system of "sulfate reduction-sulfite generation-visible light excitation of hydrated electrons", so that efficient degradation of pollutants is realized.

The present application relates to a method for in-situ remediation of chlorinated hydrocarbon contaminated soil and groundwater and its application, which adds nutrient aid solution and sulfate-reducing bacteria agent into the chlorinated hydrocarbon contaminated soil and groundwater, the nutrient aid contains organic acid salt and ferrous salt with complexation. In the method of the present application, the organic acid salt as nutrient aid promotes the growth of sulfate-reducing bacteria, which reduces sulfate to negative bivalent sulfur, and the negative bivalent sulfur reacts with divalent iron ion to generate ferrous sulfide; the organic acid salt as complexing agent forms water-soluble complex with iron ion, and promotes the dissolution of iron in non-water-soluble iron oxide in soil particles, which greatly increases the generation amount of ferrous sulfide. The organic acid salt prevents the passivation of ferrous sulfide after reducing chlorinated hydrocarbon. The above-mentioned water-soluble complex of organic acid ferrous salt, ferrous sulfide and sulfide system can efficiently reduce high-concentration chlorinated hydrocarbon pollution at low cost, solve the inhibition of high-concentration chlorinated hydrocarbon on anaerobic dehalogenation bacteria, and lay a foundation for subsequent combined use of anaerobic dehalogenation biological remediation technology.

The invention discloses a method for synchronously treating sulfate wastewater and excess sludge of a sewage plant based on mutual promotion of sulfur and carbon metabolism, and belongs to the field of water pollution control and resource recycling. According to the invention, the residual sludge of the sewage plant is used as a unique carbon source to realize synchronous treatment of sulfate wastewater and sludge in situ. The addition amount of 200-800mg / L of sulfate radicals has a remarkable promotion effect on the fermentation of the excess sludge, so that the theoretical fermentation acid yield in a sludge fermentation coupling sulfate reduction system can be increased by 1.4-6.6 times, the removal rate of high sulfate radicals reaches 97%, and the recovery amount of elemental sulfur reaches up to 12.9% of the total dry weight of the sludge. Under different sulfate radical concentrations, the sludge reduction rate within 12 days of fermentation is increased by 15%-65%. Meanwhile, a sulfur reduction product capable of accelerating the fermentation process is produced in the sulfate reduction process, so that mutual promotion of sulfur metabolism and carbon metabolism is realized. According to the method, additional organic matters and additional pretreatment means are not needed, and sulfate wastewater treatment and waste sludge resource utilization of a sewage plant can be realized in situ.

The present application provides a kind of mineral sulfide and / or sulfate content detection method and device, it is related to analytical detection technical field.The present application is determined using stage temperature combustion iodometric method, first in low temperature stage (500~700 DEG C) oxidation reaction is carried out, and the sulfide in the mineral to be detected is oxidized into sulfur dioxide;Again in high temperature stage (1150~1350 DEG C) reduction reaction is carried out, and the sulfate in the combustion residue is reduced into sulfur dioxide, and the sulfur dioxide generated in low temperature stage and high temperature stage is titrated respectively by iodometric method, and then the content of sulfide and / or sulfate in the mineral to be detected is calculated, the sulfide, sulfate and total sulfur content in the mineral to be detected can be obtained simultaneously in one detection process, and then the sulfur form distribution information in the mineral to be detected is obtained.Moreover, the method provided by the present application is simple in operation, short in time consumption, low in risk of sulfur form conversion, high in detection accuracy, and suitable for industrial detection application.

The invention discloses a method for synchronously removing nitrate and sulfate in wastewater by utilizing polybutyric acid butanediol ester. According to the method, an up-flow denitrification biological filter is adopted, PBS is filled in the up-flow denitrification biological filter to serve as a unique solid slow-release carbon source and a biofilm carrier, wastewater is pumped in from the bottom of a reactor and flows upwards through a PBS filler layer, and a denitrification reaction and a sulfate reduction reaction are conducted in different height intervals through a biofilm on the surface of filler respectively; the synchronous removal of nitrate and sulfate is realized. The stable slow release performance and carrier function of PBS are utilized, carbon source competition of denitrifying bacteria and sulfate reducing bacteria is effectively reduced through microbial function layering, and the method has the advantages of being low in operation cost, free of secondary pollution, good in effluent quality, simple in process and the like, and is suitable for deep treatment of wastewater containing nitrate and sulfate.