131 results about "Sulphide oxidation" patented technology

A process for treating oilfield waste water includes contacting the oilfield waste water with hydrogen peroxide, the oilfield waste water comprising sulfide; oxidizing the sulfide to sulfur; and precipitating the sulfur to form treated water from the oilfield waste water. A process for recycling oilfield waste water includes combining the oilfield waste water and hydrogen peroxide, the oilfield waste water comprising sulfide; oxidizing the sulfide to sulfur; forming a precipitate comprising a colloidal sulfur precipitate, a bulk sulfur precipitate, or a combination comprising at least one of the foregoing; removing the precipitate from the oilfield waste water to form treated water; introducing an additive to the treated water; and disposing the treated water in a subterranean environment.

The invention discloses a multifunctional microorganism soil repairing agent as well as preparation and application thereof and belongs to the fields of biological techniques and environment protection. The multifunctional microorganism soil repairing agent is made of the following raw materials in parts by weight through uniform mixing: 30-60 parts of nano chitosan, 10-20 parts of humic acid, 10-20 parts of nano charcoal and 20-30 parts of a composite microbial agent, wherein the composite microbial agent is prepared from fresh benzene bacillus, B.sonorensis, lysinibacillus sphaericus, bacillus licheniformis, bacillus circulans, bBacillus thuringiensis, achromobacter denitrificans, saccharothrix australiensis, Rhodococcus zopfii, pseudonocardia sulfidoxydans and pseudonocardia dioxanivorans through purification, optimization, fermentation and drying dehydration. The multifunctional microorganism soil repairing agent disclosed by the invention is capable of replacing conventional physical and chemical repairing techniques, is capable of degrading complex pollutants, is wide in repairing range, is capable of preventing soil degradation and inhibiting diseases and insects in environments, and has the advantages of being good in repairing treatment effect, low in cost and economic and environment-friendly.

The present invention is directed to a precious metal recovery process in which carbonaceous material, such as preg robbing carbon, is floated after sulfide oxidation to separate the carbonaceous material from the precious metal.

The invention discloses a preparation method of high-effect sulfur autotrophic denitrification granule sludge. Self-constructed upward flow granule sludge reactor is utilized, and the high-effect sulfur autotrophic denitrification granule sludge can be repeatedly prepared under a specific formula and a hydraulic condition. The sulfur autotrophic denitrification granule sludge is utilized under an anoxic condition, nitrate can be efficiently reduced into nitrogen, meanwhile, sulfide is oxidized into sulfate, and the effluent does not contain denitrification intermediate products such as nitrite and nitrous oxide or residue sludge, so that secondary pollution does not exist. A novel excellent and efficient method is provided for treatment of nitrogenous wastewater. No residual sludge is generated in the treatment technology, secondary pollution is avoided, the floor area of the structures is reduced, the investment and operation cost is reduced, the process target of treatment of wastes with processes of wastes against one another is achieved, and biologically synchronous nitrogen and sulfur removal process is further developed and enriched.

The present invention relates to a novel approach for nitrate removal from a marine recirculating system (10) wherein high concentrations of sulfate found in seawater is used in combination with sludge (20) collected from fish growing tanks (12) to promote dissimilatory sulfate reduction to hydrogen sulfide. The sulfide is used as an electron source to promote autotrophic denitrification in an up-flow fix bed bioreactor (16), followed by nitrification in a nitrification unit (14). By utilizing the symbiotic relationship between the sulfate-reducing and sulfide-oxidizing bacterial community, nitrate accumulation is controlled in the recirculating water of the system thereby reducing water exchange in the marine recirculating system.

The invention belongs to the technical field of water treatment, and relates to a method for removing sulfide from wastewater. In the method, a wastewater treatment container which is provided with a wastewater inlet and a wastewater outlet is arranged, wherein the top of the container is closed and provided with an air outlet; a dissolved air releaser is arranged below the liquid level in the container; an air dissolving device is arranged outside the container, and air is dissolved in the wastewater under high pressure; the wastewater which is needed to be treated passes through the container, and all of or part of the wastewater passes through the air dissolving device, so that a large amount of air is dissolved in the wastewater under the high pressure to form dissolved air water; anda large amount of oxygen dissolved in the dissolved air water reacts with the sulfide under the high pressure to oxidize the sulfide, the dissolved air water enters the container through the dissolved air releaser, pressure is suddenly reduced, the air dissolved in the dissolved air water and the sulfide in the form of hydrogen sulfide in the wastewater are separated out simultaneously to form small bubbles to be separated from the wastewater, and the residual sulfide is removed from the wastewater, so that the sulfide is removed from the wastewater. The process is simple, convenient to operate and stably operated.

The invention relates to a system and method for removing disulfide from regeneration exhaust gas of caustic fluid used in liquid gas sweetening process. The system comprises a water-washing tank, a membrane separator and an oxidation tank, wherein the top and bottom of the inner wall of the water-washing tank are separately provided with a water-washing tank demister and a water-washing tank gas distributing plate which are fixed through bolts; the top of the water-washing tank is connected with the bottom of the membrane separator through a gas discharge pipe; the inside of the membrane separator is provided with a microporous membrane internal part and a coalescence plate which are fixed through bolts; the top of the membrane separator is connected with the oxidation tank through another gas discharge pipe; and the top and bottom of the inner wall of the oxidation tank are separately provided with an oxidation tank demister and an oxidation tank gas distributing plate. The realization method of the invention involves the microbubble water-washing technology, the microporous membrane separation technology and the sulphide oxidation technology. The beneficial effects of the system and method of the invention are as follows: no power is consumed, the recycled disulfide can be used as the chemical raw material, the desulfurization efficiency is high, the cost for treating the exhaust gas is low, and the system and method are environmentally friendly and economical.

The invention relates to the field of environmental engineering and biochemical engineering, in particular to a method and a device for recovery coupling of biological sulfur and carbon dioxide for producing biogas. The method comprises the following steps of (1) using an alkali absorption liquid to absorb hydrogen sulfide and converting hydrogen sulfide into sulfide after coarse methane is subjected to dust removing treatment, using sulfur-oxidizing bacteria to oxidizing the sulfide into elemental sulfur, separating the elemental sulfur and mother solution, adjusting pH of the mother solution to be alkaline mother solution for absorbing the hydrogen sulfide again and simultaneously obtaining methane without the hydrogen sulfide; and (2) performing deep dehydration to the methane without the hydrogen sulfide and obtained in the step (1), and adopting a polyimide or cellulose acetate organic polymeric membrane to separate methane and carbon dioxide in a finally-obtained gas mixture to obtain high-purity carbon dioxide and biogas methane. By means of the method, the biogas is prepared through the methane, the biological sulfur and the high-purity carbon dioxide are obtained, and the economic benefit of the methane is improved through the biogas, the biological sulfur and the high-purity carbon dioxide.

The invention relates the technology of using thermophilic and acidophilic bacteria to treat sulphide field, comprising the following steps: screening and domesticating the thermophilic and acidophilic bacteria to get the high effective biooxidation strain; training it to get inoculation liquid whose thalline density is above 1X108 per liter; mixing the inoculation liquid, sulphide powder and culture medium of thermophilic and acidophilic bacteria, carrying out biological oxidation reaction, and when the copper ion of chalcopyrite in sulphide powder dissolving out above 70%, or 70% lattice structure of chalcopyrite destroyed, terminating the reaction. The technology uses the microbe direct oxidation action and metabolite indirect oxidation action to oxygenize the sulphide in ore to sulphate, destroying the sulphide lattice and discharging the precious metal ion.

A heat transfer component that is resistant to both corrosion and fouling is disclosed having a heat exchange surface formed from a silicon containing steel composition including an alloy and a non-metallic film formed on a surface of the alloy. The alloy is formed from the composition η, θ, and ι, in which η is a metal selected from the group consisting of Fe, Ni, Co, and mixtures thereof, θ is Si, and ι is at least one alloying element selected from the group consisting of Cr, Al, Mn, Ti, Zr, Hf, V, Nb, Ta, Mo, W, Sc, La, Y, Ce, Ru, Rh, Ir, Pd, Pt, Cu, Ag, Au, Ga, Ge, As, In, Sn, Sb, Pb, B, C, N, P, 0, S and mixtures thereof. The non-metallic film comprises sulfide, oxide, carbide, nitride, oxysulfide, oxycarbide, oxynitride and mixtures thereof. The surface roughness of the heat transfer component is less than 40 micro inches.

The invention discloses an expandable high-melt-strength polypropylene resin and a preparation method thereof. The method comprises: reacting and extruding raw materials including polypropylene, ultrahigh molecular weight polyethylene, petroleum resin, hyperoxide, bis[gamma-(triethoxysilyl)propyl]tetrasulfide, zinc oxide, stearic acid and the like in a parallel double screw extruder to obtain high-melt-strength polypropylene; and mixing the high-melt-strength polypropylene with liquid paraffin and azodicarbonamide at a high speed to obtain the expandable high-melt-strength polypropylene resin. The method disclosed by the invention is simple, low in investment and environment-friendly, and the extrusion performance of the melt is high.

The invention relates to a new method of desulfurization for oil products and solvent recovery, comprising the following steps of: oxidizing sulfide in the oil products by organic or inorganic peroxide, then compositing imidazole ionic liquid and alcohols or alcamines and alcohols derivate or alcamines derivate according to a definite proportion, which are used as desulfurizer, and extracting and removing the oxide of organic sulfur or inorganic sulfur in the oil products. At the same time, the added ironic liquid has the advantages of designable structure and polarity, so the new method can improve the desulfurization degree above 98 percent, after desulphurizinig heavy oil with higher boiling point, performing the solvent recovery by back-extracting alcohols, alcamines, ethers, nitriles with lower boiling point and the derivates of alcohols, alcamines, ethers and nitriles, while light oil with lower boiling point can perform the solvent recovery by means of reduced pressure distillation.

The invention relates to a high-salt organic industrial wastewater treatment process method for effectively solving the problems that the prior art is high in investment cost, low in efficiency and poor in effect. According to the technical scheme, the method comprises the following steps: a) performing pretreatment on plasticizer wastewater; b) adsorbing by using resin; c) mixing; d) reducing sulfate; e) oxidizing sulfide; f) precipitating elemental sulfur; g) generating methane under an anaerobic condition; h) oxidizing in biologic contact; j) participating for the second time. By adopting the method, pollutants in wastewater can be effectively eliminated, so that the pollution on the environment is reduced, and meanwhile phthalic acid recycled after resin adsorption can be further reused as a plasticizer production raw material, so that the method is innovation of organic industrial wastewater treatment.

The invention belongs to the field of metallurgical chemical industry, and particularly relates to a method for leaching nickel and molybdenum from an amorphous nickel-molybdenum sulfide mineral by oxidative conversion. According to the technical scheme, the method comprises the following steps: mixing the amorphous nickel-molybdenum sulfide mineral which is finely ground with water to prepare pulp; adding the pulp into a pressure kettle, introducing industrial oxygen, and performing temperature rising reaction under the pressure of 0.8-2.0 MPa and at the temperature of 110-200 DEG C; converting the nickel and the molybdenum into sulfates, dissolving the sulfates into a solution, and filtering the pulp to obtain a leachate containing nickel sulfate and molybdenum sulfate acyl. The characteristics of large specific surface area and high activity of the amorphous nickel-molybdenum sulfide mineral are fully utilized; under the condition that acid is not added, colloidal sulfide is directly converted into sulfuric acid and sulfate in an oxidative manner, so that the nickel and the molybdenum can be leached, the process flow is short, conventional roasting is not needed, harmful smoke pollution is avoided, the process is clean, the consumption of reagents is low, and the leaching rate of metal is high.

The invention discloses a method for pre-oxidizing oil field waste water by using the air, which comprises the following steps: introducing the air into oil field waste water to form free oxygen or dissolved oxygen in the oil field waste water; oxidizing the ferroins in the oil field waste water to form ferric ions by using the oxidization action of the free oxygen or dissolved oxygen, hydrolyzing the ferric ions to form Fex(OH)m(3x-m) and colloidal precipitate and oxidizing sulfides to form sulfur; and removing the sulfur by flocculation, sedimentation and filtration. The method has the advantages that: thermodynamic stability of the treated oil field waste water is improved, so that the water quality can keep constant and the suspended material content keeps constant and meets standards at a well mouth in the process of delivering the oil field waste water to a water distributing station and the well mouth; in the pre-oxidization process, no chemical is used, no extra sludge is produced, no pollution is produced and resources and cost are saved, so the pre-oxidization process is a 'green chemical' process; and the pre-oxidization process in which the operation is simple, convenient and safe, is easy to regulate and realize automation, has high adaptability to water volume and is convenient to promote and use.

The invention relates to a high-temperature biological heap leaching method of primary copper sulphide ores. The method comprises the following steps of: (1) crushing primary copper sulphide ores, and uniformly mixing the crushed primary copper sulphide ores with a sulphur source, wherein the sulphur content of a mixture of the primary copper sulphide ores and the sulphur source is more than 3wt%, and the sulphur source is sulfide, sulphide ore and/or sulphur which can oxidize microorganisms and generate heat; (2) building the mixture which is formed by uniformly mixing the ores with the sulphur source to form an ore pile, and laying an inflation pipeline at a pile bottom and embedding oxygen and temperature probes in the pile in a pile building process; and (3) after the ore pile is built, leaching, and supplying oxygen into the ore pile through the inflation pipeline at the same time until the leaching is completed. According to the method, sulfide is oxidized under the action of microorganisms to release a great quantity of heat, so that the pile temperature is maintained at high temperature, and finally, the high-temperature leaching of the primary copper sulphide ores is realized.

The present invention provides a new method for rapidly and sensitively detecting the total sulfide amount in natural gas. According to the present invention, negative ion mode dopant assisted photo ionization ion mobility spectrometry is adopted as the base detection technology, purified air, oxygen or mixed gas of high-purity nitrogen and oxygen is adopted as carrier gas and drift gas, regent ions having oxidability are formed in the dopant assisted photo ionization source, and sulfides in natural gas are oxidized into the high-valence sulfides having the strong electronegativity so as to achieve the determination on the total sulfur content of the sulfides in the natural gas.

Utilization of process and equipment for oxidation of metal sulfides, preferably two step metal sulfide oxidation reactions, and more preferably with looping back of second step oxide to the first step as an oxidizing agent, to generate sulfur dioxide and a useful metal or metal oxide, and react the sulfur dioxide with halogen (iodine or bromine) and water to produce sulfuric and halogen acid under moderate process conditions and equipment requirements and then dissociating the halogen acids (HI or HBr) to halogen and hydrogen as an overall environmentally and cost efficient and otherwise acceptable safe process for producing hydrogen and other useful products.

Disclosed is a sulfide removing process from diesel oil by oxidizing and absorbing, which pertains to oil processing field. The process is characterized by using hydrogen dioxide solution as oxidizing agent, oxidizing benzothiophene sulfide into corresponding sulphoxide or sulfone using titanium and silicium molecular screen as catalyst at temperature of 30-80 DEG C and under normal pressure, absorbing oxidation products by solid adsorbent to achieve object of sulfur removing, with removing ratio of benzothiophene reaching 100%. Effects and advantages of the invention is simultaneously carrying out oxidizing and absorbing, with mild condition, simple apparatus, high activity of catalyst, catalyst and adsorbent which are easy to recycle, high recycling ratio of diesel oil.

This invention discloses a process for micro-aerobic treatment of molasses alcohol wastewater. The process comprises: (1) introducing a small amount of oxygen into a micro-aerobic reactor to culture active sludge rich in sulfate-reducing bateria, methanogen and colorless sulfur bacteria; (2) adjusting the pH value of molasses alcohol wastewater to 6.5-7.0 in an adjustment pool, introducing into the sludge bed of the micro-aerobic reactor, and keeping the hydraulic retention time in the micro-aerobic reactor for 8-24 h; (3) reducing the sulfate in the wastewater into sulfide by sulfate-reducing bacteria, then oxidizing the sulfide into sulfur by colorless sulfur bacteria, and discharging sulfur with the outflow water; (4) introducing the biogas produced from methane into a gas-collection tank, and then refluxing to the precipitation zone of the micro-aerobic reactor; (5) refluxing the outflow water from the micro-aerobic reactor to the sludge bed at a refluxing rate of 50-300%. The process has such advantages as good treatment effect, and little pollution.

The invention discloses three-dimensional, ordered, mesoporous titanosilicates wherein the Ti is in a tetrahedral geometry and exclusively substituted for Si in the silica framework. Such titanosilicates find use as catalysts for epoxidation, hydroxylation, C—H bond oxidation, oxidation of sulfides, aminolysis of epoxide and amoximation, with approx. 100% selectivity towards the products.

The invention discloses a microbial capsule for tailing remediation and a three-in-one tailing in-situ remediation method. In the prior art, the operation and maintenance cost of acid wastewater treatment is high, the duration time is long, and the treatment effect is unstable. The invention provides a microbial capsule for tailing restoration. The microbial capsule comprises a porous calcium carbonate ball and a microbial agent loaded on the porous calcium carbonate ball. The microbial capsule can effectively inhibit the oxidation of sulfide minerals, and the microbial inoculum is not easy to lose. According to the separation layer, modified environmental minerals and metal ions are combined together, and a modified environmental mineral-metal combination is used as a separation substance, so that acidic wastewater formed after sulfide in an upper-layer tailing pond is oxidized can be prevented from permeating to a lower layer; and air on the upper layer is prevented from entering the bottom layer to oxidize sulfide minerals. On the basis, the isolation layer not only achieves the effect of adsorbing and isolating the pyrite, but also can oxidize sulfide minerals on the mineral surface layer through metal ions.