440results about How to "Lower pH value" patented technology

The invention relates to a saline-sodic land reclamation and control method. Wide and deep research is long developed on the reclamation of saline-sodic land at home and abroad, and more focuses on engineering measures than applies biological techniques; although achievement has been made, some insurmountable difficulties still exist. The saline-sodic land reclamation and control method comprises the following steps: bulk deep loosening, applying soil deep loosening agents and saline-sodic soil improvement agents to deep loosening soil, purposefully and proportionally applying biologically organic fertilizer according to the composition of soil detected by adopting a nutrient balance method and a nitrogen phosphorus and potassium proportioning method which both comprise the following steps: subtracting soil nutrient-supplying amount from the fertilizer requirement of target yield, supplementing the balance through fertilizing, hathpace ridge forming, draining water and controlling salt, planting green manure-saline alkali tolerant high-yielding grass crop jerusalem artichoke to thoroughly improve the soil.

The invention relates to a magnesium oxysulfate cement board and a method for preparing the same by using a semidry method. The magnesium oxysulfate cement board comprises a heat insulation core layer and strength structure layers respectively compounded on the two surfaces of the heat insulation core layer. The heat insulation core layer is a layer structure formed by stirring and pressing magnesium oxysulfate which is used as a gelatinizing agent and a light material which is used as a filler. Each strength structure layer is a layer structure formed by the magnesium oxysulfate which is used as the gelatinizing agent. The magnesium oxysulfate cement board disclosed by the invention has the outstanding substantive characteristics that a plate material with a multilayer composite structure is formed by mixing the magnesium oxysulfate utilized as the gelatinizing agent with the light material and / or a reinforcing fiber; the structure of the core layer has the characteristics of light weight and good heat preservation and heat insulation effects; the strength structure layers on the two surfaces of the core layer have the characteristics of bending resistance and high compression strength; and meanwhile, the magnesium oxysulfate cement board is low in PH value and has no chlorine content. Therefore, the occurrence of the moisture absorption and the halogenation are avoided; the corrosion on materials, such as plant fibers, metal pieces and the like, is avoided; and the application range is widened and the service life is prolonged.

The invention relates to a water-based rust conversion antirust primer which is characterized in that: the primer comprises the following components with the corresponding percentage by weight : main conversion agent 5-35, auxiliary conversion agents 2-15, film forming material 40-55, penetrant 0.2-1.0, humectant 1-10, anti-forming agent 0.1-0.5, corrosion inhibitor 0.2-0.5 and solvent 0.5-8; the process is as follows: adding deionized water to a charging basket and heating the water to 60-80 DEG C with aliphatic alcohol polyethenoxy ether added, adding propylene glycol and starting a high-speed dispersion machine for agitation, later on adding tributyl phosphate, potassium sorbate, tannic acid and one of the auxiliary conversion agents and cooling down to 20-33 DEG C after agitating for 30-55 minutes, and adding vinyl chloride-modified acrylic resin latex and discharging material after agitating for 10-20 minutes. The invention has the advantages of direct application to steel surfaces with rust, thorough conversion of rust, excellent adhesive force of a conversion film, good flexibility, adaptation to various forms, and good compatibility with various top coatings.

The invention discloses an anti-stress anti-diarrhea growth-promotion Chinese herbal medicine feed additive for a weaned pig, which is obtained by carrying out the superfine grinding and mixing on the following components at the mass ratio: 1-5 parts of Astragalus mongholicus, 1 part of Scutellaria baicalensis, 1 part of malt, 1 part of liquorice, 1-5 parts of dangshen, 1-5 parts of poria cocos and 1-5 parts of largehead atractylodes rhizome. According to the Chinese herbal medicine feed additive disclosed by the invention, the weaned pig growth performance can be improved, and the Chinese herbal medicine feed additive has the anti-diarrhea effect; the gastrointestinal tract development of the weaned pig can be promoted; the activity of the digestive enzyme of the gastrointestinal digestive tract of the wigged pig can be improved to promote the development of the pig digestive enzyme system; the micro-ecological environment of the digestive tract of the pig can be regulated and stabilized to accelerate the pig to grow; the antioxidation function of the wigged pig organism can be improved so as to improve the compensatory capability of the wigged pig organism on external irradiation; the intestinal mucosa form of the wigged pig can be improved so as to alleviate the intestinal villus withering of the wigged pig and promote the tract of the wigged pig to restore; and the immunologic function of the intestinal mucosa of the wigged pig can be regulated.

The invention discloses a farm fertilizer produced by biologic technology, in particular a decomposing agent for rapidly decomposing straws at low cost, the mixture ratio of which is aerobic bacillus subtilis Cohn 20%, Bacillus licheniformis 10%, aspergillus flavus 20%, chaetomiaceae 20%, absidia corymbifera 20%, and saccharomycetes 10%. The production procedures are: extracting different beneficial decomposed bacteria from organics from different environments, purifying, rejuvenating, breeding and culturing; inoculating the cultured bacterial strains into disinfected solid culture medium; fermenting for 4-5 days under 25-50 DEG C, airing dry so that the residual moisture in the bacterial strains is 25%; mixing, agitating evenly and packing the aired solid bacterial strains into solid decomposing agent. As the invention is made by using a unique optimization and combination of aerobic bacterial group and a high and new technology and production process, the invention is a pure biologic product, is free from smell and harm for making organic fertilizer by effectively decomposing wastes in the countryside, and the fermenting speed is high, the cost is low, and the source of raw material is wide. The invention has improved the soil structure and reduces environmental pollution.

The invention relates to a composition for improving soil, in particular relates to a saline-alkali soil conditioner. The saline-alkali soil conditioner is prepared by mixing the following components by weight percent: 20%-35% of sulfur powder, 20%-30% of humic acid, 5%-10% of bentonite, 20%-25% of magnesium sulfate heptahydrate, 8%-12% of calcium superphosphate, 1%-2% of zinc sulfate heptahydrate and 2%-3% of boric acid. The saline-alkali soil conditioner can be used for regulating acid-base level of the soil, and effectively supplementing microelements in the soil, improving the nutritional deficiency symptom of crops, chelating harmful heavy metal elements in the soil, reducing saline and alkali degree, promoting the soil to form a granular structure, improving root growth environment of crops, enhancing saline and alkali resistance of crops, disease resistance and cultivation of resilience, reducing the harm of saline and alkali to plant roots, and releasing the effective phosphorous solidified by the soil, increasing soil fertility, holding water and saving fertilizer so as to finally and completely improve the soil, recover the soil fertility, increase both production and income and improve crop quality and utilization rate of the fertilizer.

The invention discloses an organic-inorganic improvement fertilizer for saline-alkali soil and a preparation method thereof. The organic-inorganic improvement fertilizer is prepared from, 20-30 parts of bentonite, 20-30 parts of zeolite, 20-30 parts of flue gas desulfurization gypsum, 10-20 parts of dehydrated sludge, 20-30 parts of humic acid, 10-20 parts of coal ash, 20-30 parts of ardealite, 10-20 parts of peat, 10-20 parts of straw meal, 10-20 parts of animal waste, 2-8 parts of microbial inoculation bacteria and 2-5 parts of emulsified asphalt. The invention further provides a preparation method of the organic-inorganic improvement fertilizer for saline-alkali soil. According to the organic-inorganic improvement fertilizer, the physicochemical character of soil can be improved, soil permeability and moisture and fertilizer preservation can be improved, the soil ion exchange rate can be improved, the PH value can be buffered, the chemical fertilizer consumption can be reduced, the crop yield can be improved, the product quality can be improved, the soil improvement effect can be improved, and the soil improvement cycle can be shortened.

The invention relates to a saline-alkali soil conditioner and a preparation method thereof. The saline-alkali soil conditioner is constituted by glacial acetic acid, citric acid, oxalic acid and tap water. The preparation method comprises the following steps: weighing the tap water, citric acid and oxalic acid according to weight ratio and placing in a reaction kettle; starting stirring, warming up to 40 DEG C to 60 DEG C for 0.5 hour to 1 hour; weighing the glacial acetic acid according to weight ratio and placing in the reaction kettle; stirring, warming up to 50 DEG C to 60 DEG C for 0.5 hour to 1 hour; cooling down to 25 DEG C to 40 DEG C; carrying out measurement packaging after the samplings pass the inspection to obtain the finished product of saline-alkali soil conditioner. The saline-alkali soil conditioner in the invention is simple in manufacturing process, low in raw materials and production cost, and can realize the improvement of soil physicochemical property, inhibit theascending of saline matter and neutralizing the alkalinity of the soil.

The invention relates to an injectable temperature sensitive gel used for filling and repairing damaged tissues. The gel is characterized in that: medical-grade hyaluronic acid and chitosan are used as gel raw materials; the gel swelling ratio is 2-500; and a temperature sensitive temperature is 32-37 DEG C. The gel provided by the invention has the advantages that the injection temperature sensitive gel has physical and chemical properties of a general gel, also has injectable and temperature sensitive properties and a good fluidity at a room temperature and is easy for injection; the formability in organisms is good and the degradation is slow so that the general gel can not be compared; a cross-linking agent is not used for the gel so that harms of the cross-linking agent to a human body are avoided; a gel system can prolong a persistence time of the gel in a body, and also can continuously stimulate the body to produce reactions so that the tissue in-situ regeneration and repair is promoted and the filling quality is increased; and the gel simultaneously has the advantages of reducing bacterial invansion, anticoagulation and low allergic reaction and the like.

The acidifying agent as fodder additive is compounded with several kinds of organic acid with lactic acid as main component and / or organic acid salt, and features that it has total organic acid amount of 45-53 wt% and silica hydrate as carrier. The acidifying agent has good compatibility and strong acidifying effect, and its coated product has no corrosion and harm, and no destruction to protein and vitamins and may be mixed well with various feed components.

The invention discloses a healthcare electronic cigarette juice capable of preventing and curing decayed teeth. The health electronic cigarette juice mainly contains 3-5%w / v of a tobacco extract, 40-50%w / v of propylene glycol, 10-15%w / v of purified water, 3-5%w / v of a tobacco flavor, 0.2-1%w / v of a stabilizer, 3-8%w / v of a thickener, 0.5-4%w / v of xylitol, 0.5-4%w / v of L-arabinose and 3-9% w / v of sodium fluoride solution. As the healthcare electronic cigarette juice capable of preventing and curing the decayed teeth contains the xylitol and the sodium fluoride, the healthcare electronic cigarette juice has the effect of preventing and curing the decayed teeth, and increasing the teeth strength; and the cigarette juice can also have healthcare function and prevent and cure the decayed teeth of oral cavity and teeth while enjoying smoking and smoke exhalation.

The invention discloses a method for decreasing a pH value of a ternary material. The method comprises the following steps of: washing the ternary material which serves as a raw material by using deionized water or a solution which contains HCO3<->; performing suction filtration on the material; placing the material into a muffle furnace, and performing multi-step sintering; and ball-milling and grinding the material, and thus obtaining powder. The method has the advantages that 1) the material is washed by using the deionized water, resources are fully utilized, and the method is simple, easy to operate and low in cost; 2) when heated, the solution which contains the HCO3<-> is decomposed into water and carbon dioxide, which are environment-friendly and pollution-free; and 3) the method is novel, the pH value of the ternary material can be successfully decreased, and the electrochemical performance of a battery is improved.

The invention discloses a method for making a fermenting bed for ecological pig breeding by using composite strain culture, in particular relates to a method for making the fermenting bed by using a plurality of microorganisms. The invention comprises the steps of preparing the culture and making the fermenting bed. In the invention, the culture is mainly prepared by microzyme, lactobacillus, actinomycetes, photosynthetic bacterium and mycelial fungus according to proportion. The culture after being activated is stirred uniformly with organic padding pro rata, piled, fermented, prepared into the fermenting bed, and then can be used for breeding live pigs. The method solves the problems of long fermenting starting time of the organic padding, unstable microbial inoculum, strict requirements on the fermenting conditions and materials as well as short service life in the existing ecological pig breeding method. The method uses the composite strain culture to build ecological colony house; the fermenting starting time of the organic padding is short, which can be 1 to 2 days in summer and 3 to 5 days in winter; the strain activity is strong; the decomposing process can be finished in 1 to 3 days; the effect lasts for long; and the fermenting bed can be continuously used for 5 to 8 years. Moreover, the method is green and environmental friendly.

The invention discloses an industrial sludge treatment method and a method for preparing various fertilizers by using the treated industrial sludge. The industrial sludge treatment method comprises the following steps of: after industrial sludge is diluted, adding a heavy metal ion capturing and precipitating agent DTCR and reacting the agent with heavy metal ions in waste solution so as to generate water-insoluble chelated salt; adding a polyacrylamide flocculating agent to ensure that the chelated salt forms flocculent precipitates; and removing the flocculent precipitates to obtain sludge water, and adding potato water into the sludge water to ferment the sludge. The method for preparing various fertilizers by using the treated industrial sludge comprises the following steps of: preparing a powdery biological bacterial fertilizer by taking the sludge water obtained from the treated sludge as a raw material; and preparing a granular organic fertilizer and a fertilizer for changing saline and alkaline lands into fertile farmlands by taking the powdery biological bacterial fertilizer as a raw material. The industrial sludge treatment method has low cost and does not cause secondary pollution to the environment. The biological bacterial fertilizer and the granular organic fertilizer which are produced by the invention are used in lands of various areas, the yield is improved by 15 to 20 percent; and the fertilizer for improving the saline and alkaline lands has extremely obvious saline and alkaline transformation effect.

The present invention relates to a cylindrical spraying tower for eliminating the sulfur dioxide in the flue gas and a method for eliminating the sulfur dioxide in the flue gas with the spraying tower thereof, wherein the spraying tower is provided with two vertical clapboards and is provided with a defroster at the outlet, the clapboard is provided with an opening thereby dividing the absorbing area to three areas and dividing the serous fluid tank into two sections. The flue gas contacts with the spraying serous fluid concurrently and then countercurrent in the area of the absorbing area and is discharged through the defroster. The excellent desulfurizing effect is realized and the method is especially suitable for the wet limestone gypsum flue gas desulfurization technique of the large-scale thermal power plant with the power more than 300MW.

The invention discloses a method for producing chicken manure fermented feed, which comprises the following steps that: fully mixing fresh chicken manure with a carrier, and sterilizing and cooling the mixture to obtain a mixed material for standby; mixing and dissolving food-grade glucose in water to obtain nutrient fluid; mixing bacteria solution of yeast with bacteria solution of lactobacillus to prepare mixed bacteria solution; fully mixing and sealing the prepared mixed material, nutrient fluid and mixed bacteria solution in a plastic bag for fermentation at a temperature of between 25 and 35 DEG C for 2 to 4 days to obtain a fermentation material; and drying the fermentation material prepared by the steps; and when the water content in the fermentation material is reduced below 10 percent, crushing the fermentation material to obtain a finished product of the chicken manure fermented feed. By the method, parasite ova and harmful bacteria contained in the raw chicken manure can be removed, and the chicken manure can be prepared into the feed with good palatability and rich nutrition.

The invention discloses a forest planting method for saline and alkaline lands. The forest planting method comprises the steps of digging pits in saline and alkaline land blocks according to the shapes of micro-moist irrigation devices, scattering a compound fertilizer to the bottoms of the pits, placing micro-moist irrigation devices and plants in the pits, and carrying out soil covering and backfilling. By virtue of the special compound fertilizer with microbial activity, the soil fertility can be durably provided, and the micro-moist irrigation devices can be automatically and manually regulated to irrigate, so that the water is saved, and the maintenance is facilitated; the soil condition of a planting region is effectively improved, the pH value is decreased from originally 8.7 to 7.4, the alkalization degree of soil is decreased to about 2.5%, the total porosity of soil is increased to about 50%, and the air permeability is increased to about 15%; and furthermore, the survival rates of plants are all above 95%.

The invention relates to a method for preserving white fish by removing the scales and the internal organs of the white fish, cleaning the whiter fish, cutting into sections, pretreating, preserving and storing at low temperature. The method comprises the following steps: (1) pickling the pretreated white fish with salt and garlic powder for 5-15min, cleaning the white fish, and soaking into a preservative for 20-40min; (2) subjecting the white fished treated in the step (1) to modified atmosphere packaging by using a modified atmosphere packaging machine; and (3) subjecting the packaged white fish to direct gamma irradiation by using a cobalt 60 irradiation source. The method is easy to operate and practical. Due to the adoption of the method, the freshness and the color of the meat of the white fish can be better kept, and the shelf life of the meat of the white fish can be prolonged. The preservative is convenient to use and is safe and environmentally-friendly.

The invention discloses an injection gel containing submicron hyaluronic acid microspheres and a preparation method thereof. The diameter of each microsphere is 100 nanometers to 50 micrometers. Swelling ratio of the injection gel is 2-2000. The preparation method includes: dissolving biodegradable hyaluronic acid into organic solvent to obtain spinning solution; electrospinning the spinning solution using electrostatic spinning, and crosslinking through coagulating bath to obtain nano / submicron microspheres; dialyzing to purify the microspheres, preparing into injection with phosphate buffer or normal saline, and homogenizing with suspension of a stem cell growth factor system according to a certain volume ratio to obtain the injection gel. The injection gel containing submicron hyaluronic acid microspheres prepared by the method is fine in shaping performance, long in shape preservation, and fine in cell compatibility, and is applicable as therapeutic for ophthalmology and orthopedics, also applicable as tissue-engineered repair materials such as bone tissues, cartilage tissues, blood vessel tissues, heart tissues and nerve tissues or as filling material for plastic surgery.

The present invention discloses a special compound fertilizer for saline-alkali soil and a production method thereof. The compound fertilizer comprises microbial agents, mineral fertilizers, organic fertilizers, slow-release fertilizers, and controlled-release fertilizers. The microbial agents include halophilic bacteria, alkalophilic bacteria, nitrogen-fixing bacteria, phosphate solubilizing bacteria, potassium bacteria, Bacillus subtilis, Bacillus licheniformis and E. coli; the mineral fertilizers include Chinese medical stone, calcite and zeolite; the organic fertilizers include one or more of cow manure, horse manure, chicken manure, humic acid, milk vetch, alfalfa, crushed straw, leaf mold, soybean meal, peanut meal, fermentation product residues; the slow-release fertilizers include calcium superphosphate and urea formaldehyde; and the controlled-release fertilizers include ammonium sulfate, potassium chloride, potassium sulfate and ammonium chloride coated by semi-permeable membranes with different thicknesses. The fertilizer can effectively improve soil structure, reduce salinity and pH value of the soil, increase soil fertility, and maintain lasting fertility, and is particularly conducive to improving the saline soil.

The invention discloses a bloat and grainsick preventing and treating feed for beef cattle. The feed comprises following raw materials in parts by weight: 0.3-0.5 part of magnesium sulfate, 0.3-0.5 part of sea salt, 5-10 parts of atractylodes macrocephala koidz, 10-15 parts of pericarpium citri reticulatae, 5-10 parts of pine needles, 10-15 parts of hawthorn leaves, 2-5 parts of lactic acid bacteria, 2-5 parts of bifidobacterium, 2-5 parts of bacillus subtilis and 0.5-1 part of cellulase. The feed can be used for nourishing the stomach and dispelling cold and can effectively prevent and treat bloat and grainsick; the treatment course is short and the effect is rapid; antibiotics are not used; the relapse possibility of bloat and the grainsick is small; the sources of the raw materials are wide, the cost is low and the production process is simple.

The invention relates to a preparation method for a fluidized bed catalyst with high abrasive resistance and mainly solves the problem of relatively low abrasive resistance of the fluidized bed catalyst in the prior art. The invention better solves the problem through the technical proposal with following steps: (a) a molecular sieve, a caking agent, a base material, thin powder of the catalyst and a liquid medium are evenly blended to form suspension liquid; (b) the pH value of the suspension liquid is controlled to be lower than the isoelectric point of the molecular sieve by over 0.4; (c) the suspension liquid is dried to form a microspheroidal catalyst; (d) the microspheroidal catalyst is baked at high temperature to form a finished product of the catalyst; the catalyst can be applied to the reaction process of manufacturing light olefins from the raw materials such as methanol or dimethyl ether.

The invention provides a mutterlauge recycling and catalyst purifying and regenerating system for pure terephthalic acid (PTA) and the relative method thereof. The method aims at recycling the pure terephthalic acidmutterlauge produced in the process of purifying the pure terephthalic acid (PTA), thereby leading inorganic acid solution to contain no cobalt, purifying the regenerating system with the catalyst, purifying the regenerating system with the cobalt to electrolyze out the cobalt metal, oxidating the catalyst making system to acquire oxidized catalyst, and recirculating to the production process of the pure terephthalic acid (PTA).

The invention discloses a silicon wafer cleaning process. The silicon wafer cleaning process comprises the following steps of (1) using deionized water to clean the surface of a silicon wafer, (2) using an SC-1 cleaning solution to clean the surface of the silicon wafer, (3) using deionized water to clean the surface of the silicon wafer, (4) using a mixed solution containing HF, HCL and H2O to clean the surface of the silicon wafer, and (5) using deionized water to clean the surface of the silicon wafer. According to the silicon wafer cleaning process, due to the fact that the HCL is added to DHF, acidity of the DHF is improved, the metal attachment phenomenon in cleaning fluid cannot easily happen in the high-acidity solution, and the high capacity of removing metal on the surface of the silicon wafer is achieved; compared with a DHF process, the silicon wafer cleaning process has the three advantages that Na, K, Ca, Mg and Al can be further and effectively removed through the HCL; the PH value of the solution of the HCL is lowered, the state of metal complexing ions in the cleaning fluid is controlled, and reattachment of metal is inhibited; the content of Cu2O and the content of CuO on the surface of the silicon wafer can be reduced, and thus the content of Cu on the whole surface of the silicon wafer is controlled.

The invention relates to the technical field of solid drink, and in particular relates to a small molecule peptide solid drink. The small molecule peptide solid drink comprises the following ingredients by mass parts: 30-50 parts of soybean oligopeptide, 30-50 parts of animal oligopeptide, 5-8 parts of collagen peptide, 10-15 parts of apple powder, 3-5 parts of xylo-oligosaccharide and 1-2 parts of fructo-oligosaccharide. With the adoption of the technical scheme proposed by the invention, the small molecule peptide solid drink has the beneficial effects that the small molecule peptide solid drink has high nutrition value, polypeptide is easy to digest and absorb, and the polypeptide as a bioactivator has the functions of coordinating intestines and stomach, enhancing immunity, supplementing nitrogen source quickly and beautifying face.

The invention relates to a composite rice seedling agent and a preparation method thereof. The composite rice seedling agent comprises the following components based on 1000kg: 420-490kg of acidified coal slag, 100-150kg of sulfuric acid, 200-230kg of diammonium phosphate, 70-110kg of ammonium sulfate, 65-85kg of nitro humic acid, 30-40kg of rare earth, 27-35kg of potassium sulfate, 10-12kg of zinc sulfate and 8-10kg of iron sulfate. The composite rice seedling agent provided by the invention can be used for preventing and treating rice seedling blight and improving the disease-resistant capability and development quality of rice seedlings so that the rice seedlings can well thrive.

The invention discloses a three-step improvement method for saline alkali soil. According to the method, the saline alkali soil is improved through three steps that firstly, the saline alkali soil is treated through ardealite, most of salt is taken away from the saline alkali soil, and the pH value of the saline alkali soil is lowered; secondly, the saline alkali soil is treated through bagasse absorption agents, polysilicon acid ferric sulfate, poly-aluminum ferric silicate sulfate and kieselguhr, the content of the salt and the pH value of the saline alkali soil are further lowered, and the soil structure of the saline alkali soil is improved effectively; thirdly, fermentation materials such as mushroom bran and oil cakes are adopted for treatment, the content of the salt in the saline alkali soil is further lowered, the pH value of the saline alkali soil is lowered, the content and category of microorganisms are increased for the saline alkali soil, and the content of organic matter of the saline alkali soil is increased.

The invention provides an acid lixiviation based recycling treatment method of aluminum circulating coagulation sludge. The method is characterized by comprising the following steps of: dehydrating sludge to reduce water content of the aluminum circulating coagulation sludge to be lower than 80%; drying and baking; carrying out acidifying treatment: adding mixture of water and acid to adjust pH value of sludge slurry to 3, controlling reaction temperature to be 38 DEG C and agitating sludge and acid in mixed liquid so that the sludge and the acid sufficiently contacts; separating and purifying; and finally, filtering, evaporating and crystallizing to obtain crystal aluminum salt with a flocculation effect. According to the acid lixiviation based recycling treatment method of the aluminum circulating coagulation sludge, a large part of water and aluminum in the sludge is converted into a flocculating agent and impurities are further removed by separating to purify the flocculating agent, thereby improving the recycling of an aluminum salt flocculating agent, greatly reducing sludge disposal cost and further reducing COD (Chemical Oxygen Demand), pH value, residual organic matters and chromaticity of the sludge wastewater; and therefore, the aim of recycling is realized, the subsequence biochemical treatment is easy to implement and the damage of wastewater discharging to the environment is reduced.

The invention relates to a drinking type acidulant and a preparation method and application thereof. Each 100ml of the acidulant contains components of 15-25ml of formic acid, 25-35ml of lactic acid,15-25g of citric acid, 5-15g of fumaric acid, 1-8g of calcium formate, 1-8g of sodium butyrate and the balance deionized water, wherein all of the components are 100ml. The preparation method comprises the following steps of performing injection according to the amount of 50-80% of the total amount of water to a stirring tank, starting a power supply, performing stirring at 120r / min, slowly addingthe fumaric acid, then adding the calcium formate and the sodium butyrate, performing stirring for 15min, after the fumaric acid, the calcium formate and the sodium butyrate sufficiently dissolve inthe water, slowly adding the citric acid, the lactic acid and the formic acid separately, and finally, adding the remaining water for uniform stirring so as to obtain products. Compared with the priorart, the drinking type acidulant contains various organic acid and organic acid salts, can regulate the acid of a ration system, can reduce the pH value of the digestive tracts of animals, can improve the activity of digestive enzymes, can promote the digestion of nutrient substances, can effectively control diarrhoea of piggies at the weaning and child care period, can regulate the intestinal microecology balanced, and can promote growth of the piggies at the weaning and child care period. Besides, when the drinking type acidulant is drunk, growth and propagation of pathogenic microorganismsin animal organisms, feeds and environment can be greatly reduced, and the usage amount of antibiotics can be directly reduced, so that drug tolerance, remaining and pollution problems caused by antibiotics can be reduced.

The invention belongs to the field of food preservation, and particularly relates to a fresh-keeping method for prolonging preservation duration of strawberries. The method comprises the following steps: selecting materials, preparing strawberry extracts, preparing a mixed chitosan solution, preparing fresh-keeping liquid, and soaking and air drying strawberries. The main components of the fresh-keeping liquid are supernate extracted from the strawberries and chitosan, raw materials of the supernate and the chitosan can be obtained conveniently, and particularly the supernate of the strawberries can be directly extracted from the bought strawberries, and is not required to be separately bought. According to the method, bacillus subtilis is added into the fresh-keeping liquid, so that growth and reproduction of mycete and botrytis cinerea can be effectively inhibited. Active substances, such as subtilin and gramicidin are produced during the growth of bacillus subtilis cells, and have obvious inhibition effects on the mycete and botrytis cinerea; in addition, the bacillus subtilis quickly consumes oxygen in the environment, and produces organic acids, such as lactic acid, so that the PH value of the environment is reduced, the growth of the mycete and botrytis cinerea is indirectly inhibited, and the storage duration is greatly prolonged.