32results about How to "Reduce the concentration of hydrogen sulfide" patented technology

The invention relates to a method for identifying a useful protein of brewery yeast. More specifically, the invention relates to (a) cultivating yeast under a predetermined cultivation condition; (b) extracting a protein sample from the cultivation product of the yeast; (c) separating the protein sample by a protein separation means, selecting a target peak or spot, and recovering the target protein or a fragment thereof contained in the peak or spot; (d) determining the amino acid sequence of the target protein; (e) comparing the amino acid sequence determined in step (d) with the amino acid sequence determined in advance based on all or a part of genome sequence information of bottom fermenting yeast; (f) identifying the target protein and the gene encoding the target protein based on the results of comparison; and (g) analyzing functions of the identified gene to identify characters given to the yeast by the gene.

A system for removing undesirable compounds from contaminated air includes a biofilter having porous glass media. Hydrogen sulfide is removed from contaminated air by passing the contaminated air through the biofilter.

The invention relates to the kitchen waste treatment field, in particular to a two-phase anaerobic fermentation method for kitchen waste. The two-phase anaerobic fermentation method for kitchen waste includes the steps of: 1) sending leached oil water into a grease separation system to undergo grease separation, recovering the separated grease, and carrying the separated wastewater and the kitchen waste conveyed by a lifting screw conveyor to a crushing separation system; 2) carrying out crushing and separation; 3) conducting hydrolytic acidification; 4) inputting the waste slurry subjected to hydrolytic acidification in a hydrolysis tank into a heat exchanger, performing heating, then sending the waste slurry into a fermentation tank to undergo anaerobic fermentation; 5) conducting re-fermentation, and subjecting biogas to desulfurization treatment; and 6) recovering biogas residue and biogas. The method provided by the invention applies the two-phase anaerobic technology to the kitchen waste industry, and can effectively avoid the easy acidification phenomenon of high concentration organic waste anaerobic fermentation. The multifunctional tank integrating gas production, gas storage and desulfurization is adopted in the invention, and the gas production efficiency is improved.

The invention provides a nanometer air deodorizing and purifying liquid and a preparation method thereof. The nanometer air deodorizing and purifying liquid comprises, by weight, 25-35 parts of nanometer titanium dioxide, 23-28 parts of corn polypeptide, 8-12 parts of nanometer calcium peroxide, 8-12 parts of a dispersant and 13-36 parts of water. According to the nanometer air deodorizing and purifying liquid, the size effect, the quantum effect, the interface effect and the tunnel effect among different components are reasonably applied, and the remarkable deodorization effect is achieved. After ammonia is treated by the air purifying liquid, the ammonia concentration is as low as 0.01 mg / m<3>, the hydrogen sulfide concentration is as low as 0.002 mg / m<3>, and the odor concentration is as low as 118. The raw materials are easy to obtain, the cost is low, the deodorization effect is remarkable, the preparation method is simple and convenient, and industrial application and promotion are facilitated.

The invention relates to a method for preparing a vulcanization type gasoline hydrogenation upgrading catalyst. Gasoline hydrogenation catalysts are treated by vulcanizing agents with multiple sulfur ions and organic nitride which is used as a passivator at the low temperatures, active components in the gasoline hydrogenation catalysts comprise a type or a plurality of types of Mo and W of VI B groups and Co and Ni of VIII B groups, and stabilizers comprise a type or a plurality of types of Zn and Cd of II B groups, Na and K of I A groups and rare earth metal La and Ce. The method has the advantages that cascade full vulcanization can be carried out on metal oxide or precursors of the metal oxide, and strong acidic sites in ZSM-5 molecular sieve composite carriers can be selectively passivated; the vulcanization type gasoline hydrogenation upgrading catalyst prepared by the aid of the method is short in on-stream time, high in hydrogenation and olefin reduction upgrading activity, selectivity, carbon deposition resistance and liquid yield and low in octane number loss, and accordingly the method and the vulcanization type gasoline hydrogenation upgrading catalyst are particularly applicable to producing clean gasoline components from inferiorly catalytically cracked gasoline by means of hydrogenation and olefin reduction upgrading at a low cost.

The invention discloses a multifunctional base modifier and a preparation method thereof. The multifunctional bottom modifier includes: peanut shell powder, peanut antimicrobial peptide, peanut water-soluble dietary fiber, tea polysaccharide, diatomaceous earth, xanthan gum, cerium ammonium nitrate, zeolite powder, Bacillus pumilus, Bacillus subtilis, swamp red Pseudomonas, Lactobacillus plantarum, Saccharomyces cerevisiae. Preparation method: cerium ammonium nitrate and xanthan gum are catalyzed by microwaves to make xanthan gum polysaccharide-cerium complex; mix it with diatomite, Bacillus pumilus, Bacillus subtilis, Rhodopseudomonas palustris, Lactobacillus plantarum , beer yeast to make microcapsule preparation; peanut shell powder, peanut antibacterial peptide, peanut water-soluble dietary fiber, tea polysaccharide, microcapsule preparation and zeolite powder are mixed and granulated. The multi-functional bottom modifier has the functions of adsorbing heavy metals, degrading pesticide residues and drug residues, resisting harmful bacteria and viruses, degrading organic matter, reducing the concentration of ammonia nitrogen, nitrite, and hydrogen sulfide in water and bottom, improving bottom quality, and improving water transparency. Function.

The invention discloses an NHD desulphurization-decarbonization absorption process. The invention is characterized in that the NHD desulphurization and decarbonization are finished in one absorption tower, systemic circulation is low, running equipment is less, and hydrogen sulphide at the outlet of the absorption tower is not more than or equal to 2ppm and CO2 index can be less than or equal to 5% according to follow-up product requirement. The concentration of the hydrogen sulphide in regenerated acid gas is over 70%, and the hydrogen sulphide can be directly used by downstream products. The invention has the advantages of simple process, reasonable energy utilization, convenient operation, low investment and small occupied space, and is suitable for the purification system for producing methanol, synthetic ammonia or other gases.

The invention discloses a method for elimination and inhibition of hydrogen sulfide in oil well production. The method comprises a measure for processing a water well tube pillar and a water injection near-well zone, as well as a measure for processing an oil well tube pillar and a near-well zone of oil well tube pillar. The method disclosed by the invention has the advantages that generation of the hydrogen sulfide during the oil well production can be eliminated and inhibited efficiently and safely; the method has good effects and a long-term measure validity period especially for the inhibition of hydrogen sulfide which is generated from bacteria breeding; the maximum decrease rate of the hydrogen sulfide concentration reaches 99.68%; the method disclosed by the invention can obviously reduce the hydrogen sulfide concentration at different well temperatures; and a green and environment-friendly bactericide can be selected during biologic inhibitor selection of the method disclosed by the invention, so that fewer influences are brought to environments. The method is an economic, practical and environment-friendly technological measure for controlling the hydrogen sulfide generation.

The invention relates to a rotational flow strengthening method and device for purifying sulfur production tail gases by the Claus method, and provides a rotational flow strengthening method for purifying sulfur production tail gases by the Claus method. The method comprises the following steps of: (i) after heat exchange treatment for sulfur production tail gases by the Claus method, mixing the treated tail gases with hydrogen for hydrogenation reaction so as to reduce and hydrolyze elemental sulfur, SO2, COS and CS2 carried in tail gases to H2S; (ii) primarily cooling gases obtained in step (i) and absorbing H2S by countercurrent to remove waterdrops entrained in the gases while performing secondary cooling; (iii) absorbing H2S by countercurrent from the gases obtained in step (ii) for rotational flow separation so as to further remove H2S, and meanwhile rotationally separating amine liquid entrained; and (iv) burning the purified tail gases obtained in step (iii), and cooling to be discharged to atmosphere. The invention further provides a rotational flow strengthening device for purifying sulfur production tail gases by the Claus method.

The invention relates to a desulfurizing system for biogas containing high-concentration hydrogen sulfide. The desulfurizing system comprises a biogas inlet, a biogas flowmeter, a biogas cabinet, a wet-process desulfurizing tower, a gas-water separator, a plurality of dry-process desulfurizing towers in serial connection or parallel connection, an outlet gas detector, a biogas fan and a biogas utilization pipeline which are sequentially communicated through biogas, and both spraying liquid after being treated by the wet-process desulfurizing tower and liquid of the gas-water separator enter adesulfurizing liquid regeneration and treatment device. The desulfurizing system combines wet-process desulfurizing with dry-process desulfurizing, and concentration of hydrogen sulfide can be loweredfrom higher than 20000ppm to below 100ppm to meet biogas energy utilization needs. the desulfurizing system is low in running cost, economic benefit can be generated utilizing biogas after being treated by the system, and generated byproducts can be sold as goods, so that many things are achieved at one stroke.

The invention discloses a method and a device for removing hydrogen sulfide in a gas phase through oxidation. The device comprises a settling tank, an extracting pump, a filtering membrane, an ultra gravity rotary packed bed, a separator, a balanced tank and a regeneration ultra gravity machine, wherein the extracting pump and the filtering membrane are sequentially connected between the settling tank and the ultra gravity rotary packed bed; the balanced tank is connected between the settling tank and the separator; the ultra gravity rotary packed bed is communicated with the balanced tank; the settling tank and the separator are sequentially connected with the extracting pump and the filtering membrane; and the extraction pump and the filtering membrane are sequentially connected between the settling tank and the regeneration ultra gravity machine. A technology flow of pre-oxidation sweetening, ultra oxidation sweetening, sulfur settlement, and regeneration is adopted for the method. According to the method and the device, the ultra gravity machine is adopted to replace the traditional low-mass-transfer-efficiency reactor, and the ultra gravity rotary packed bed reactor is adopted both in hydrogen sulfide oxidation and catalyst regeneration, the process mass transfer efficiency is intensified greatly, and the regeneration time oxidation sulfur removing time and the desulfurizing agent regenerating time are shortened.

The invention discloses a method for utilizing fresh jujube fermentation to prepare a pig feed. According to the method, whole fresh jujubes are used as main raw materials and are compounded with peanut meal, tea meal, DDGS, lysine residues, composite trace elements and compound vitamins; the microbial additive prepared from enterococcus faecium, bacillus natto, candida utilis and trichoderma longibrachiatum are added, and sealed anaerobic fermentation is performed at the temperature of 16-23 DEG C for 5 days, and then fermentation succeeds; it is detected that the flavonoid content in the feed after fermentation is greater than 2000 mg / kg, and the cyclic adenosine monophosphate content is greater than 7.0 mg / kg. The fermented feed can be used for feeding pigs, improves the production performance and immune functions of pigs and reduces the influence of the concentration of ammonia and hydrogen sulfide in a piggery and the mineral element content in pig manure content, and the feed cost is reduced.

The invention discloses a method for increasing methane production efficiency in organic waste anaerobic process. The method is characterized in that powder containing no less than 15% of free ferric iron oxides is added into an anaerobic biochemical system to be uniformly blended, wherein the anaerobic biochemical system produces methane by utilizing organic wastes; and ferric ions released when microbes reduce the ferric iron oxides in the anaerobic process can promote the activity of anaerobic bacteria such as methane bacteria and the like, thus increasing the production rate and yield of methane by utilizing organic wastes. The method can be widely used for increasing the methane production rate and yield of an energy utilization system for biogas production of municipal domestic waste, agriculture product processing wastes, excess sludge of sewage treatment plants, feces of intensifying raising farms and the like and improves the utilization rate of renewable energy sources of organic wastes.