37results about How to "Prevention and Control of Pollution" patented technology

The invention provides a method for acquiring a safe and effective umbilical cord mesenchymal stem cell. A pollution-free umbilical cord mesenchymal stem cell can be prepared by umbilical cord acquisition, umbilical cord transportation, umbilical cord preparation and methods of detecting, screening, adding antibiotics and the like in a cell culturing process, so that the safety can be guaranteed; and improved culture system and culture method are adopted in the separating and culturing processes, so that the separation efficiency is improved, the culturing cycle is shortened, and a high-purity excellent-characterization cell can be obtained. According to the method, the cost can be effectively reduced, the high-quality umbilical cord mesenchymal stem cell can be quickly acquired, injury on cells can be reduced, the culturing cycle can be shortened, pollution can be reduced, and the cell purity can be improved.

The invention discloses a salmonella phage LPSE34. The preservation number of the salmonella phage LPSE34 is CCTCC NO 2018121. The phage is a broad-spectrum salmonella phage and can crack drug-tolerant salmonellas, it is identified that the phage belongs to myoviridae, and the phage is named as LPSE34. The phage LPSE34 is stable in titer at the pH of 4-12 and the temperature of 30-60 DEG C. The invention further discloses application of the salmonella phage in food, especially in chicken and ham systems; and in addition, the invention further discloses a compound edible coating film formed bytaking the phage as an antibacterial substance to be combined with sodium alginate, and compared with antibiotics and chemical preservatives, the phage cannot affect the texture and flavor of food andhas the characteristics of high specificity, no residue and safety. The salmonella phage LPSE34 can serve as a bacteriocidal substance/the antibacterial substance to control pollution of food-borne pathogens to the food and is a very promising biological agent for guaranteeing the food safety.

The invention discloses a salmonella typhimurium bacteriophage T156 and application thereof. The bacteriophage is a broad-spectrum type, can split salmonella and a drug-resistant strain thereof, and is identified as a caudal bacteriophage long-tail bacteriophage family; and the bacteriophage T156 has stable titer with the pH of 3-12 and the temperature of 30-50 DEG C. The bacteriophage provided bythe invention can be used for effectively controlling salmonella typhimurium ATCC 13311 in a food sample, and has the characteristics of high specificity, no residue and safety compared with antibiotics and chemical preservatives.

The invention discloses a method for measuring the content of radioactive elements thorium and uranium in coal gangue. The method comprises the following steps: carrying out microwave digestion on coal gangue in a concentrated nitric acid-concentrated hydrofluoric acid-concentrated hydrogen peroxide system in a closed manner, adding concentrated perchloric acid after the digestion is completed, performing heating on an acid driving instrument to remove fluorine and silicon, heating a sample digestion solution until white smoke comes near, performing cooling, adding nitric acid to dissolve salts, and performing diluting with ultrapure water to obtain a test solution; preparing a series of standard solutions and internal standard solutions, and determining by using an inductively coupled plasma mass spectrometer. According to the invention, hydrogen peroxide is added during microwave digestion, the decomposition of fixed carbon in the sample is obviously promoted, and the dissolution effect of the to-be-detected element is improved. According to the method, the content of the natural radioactive elements thorium and uranium in the coal gangue sample can be rapidly determined, the detection limit of the method reaches 0.0028 mu g/g, the relative standard deviation ranges from 0.75% to 2.54%, and the adding standard recovery rate ranges from 98.00% to 103.60%.

Compositions that include a mixture of biosoluble inorganic fibers and a micaceous binder are described. The compositions can be prepared free of refractory ceramic fibers that are respirable but durable in a physiological medium. The compositions are typically in the form of a sheet material or a paste and can be used, for example, as a protective packing material around the pollution control element or as an insulating material in the end cone region in a pollution control device. Sheet materials formed from the compositions have an area of a X-Y plane that decrease less than about 6 percent when heated to about 900° C.

The invention belongs to the automobile structure field and discloses an automobile fuel evaporation control system; a gasoline fuel tank (1) and a methanol fuel tank (2) are connected with an active carbon tank (10) through a fuel vapor tube (7); the fuel vapor tube (7) is communicated with the methanol fuel tank (2) through methanol tank gravity valves (8, 9) and communicated with the gasoline fuel tank (1) through a gasoline tank gravity valve (6). The invention also provides a fuel evaporation control method adopted by the control system. When the technical proposal is adopted, the gasoline vapor and the methanol vapor are effectively avoided from polluting the environment; the oil vapor is recovered to have the oil-saving effect and reduce the oil consumption. The automobile fuel evaporation control system and the control method have the advantages of simple structure, reasonable design, less pipeline connection, low cost, convenient application, mounting and being applicable to the fuel evaporation discharge control of the flexible fuel automobiles.

The invention discloses a method for evaluation of agricultural soil nitrate nitrogen leaching loss. The method is specifically implemented according to the steps of: dividing a soil profile into surface soil, middle soil and bottom soil; acquiring the respective soil physical clay content percentage of the surface soil, the middle soil and the bottom soil; acquiring a surface soil texture coefficient, a middle soil texture coefficient and a bottom soil texture coefficient; taking importance degree of agricultural soil nitrate nitrogen leaching loss as the basis, conducting weight assignment to all layers of soil to obtain a surface soil texture coefficient weight, a middle soil texture coefficient weight, and a bottom soil texture coefficient weight; calculating a soil nitrate nitrogen leaching loss index, and determining the evaluation criterion. The method provided by the invention evaluates the soil nitrate nitrogen leaching loss degree, then determines the nitrogen application amount of crops and the fertilizing method, and avoids pollution of nitrate nitrogen leaching loss caused by excessive use of nitrogen fertilizer to underground water.

The invention relates to a flue gas desulfurization system for a zinc smelting process. The system comprises a zinc oxide ore pulp manufacturing part, a primary desulfurization part, a secondary desulfurization part and a tertiary desulfurization part. The zinc oxide ore pulp manufacturing part: zinc scum after casting is subjected to ball milling, the metal zinc in the zinc scum is separated, thezinc scum is subjected to a fluorine and chlorine removal process until the fluorine content is not more than 0.1% and the chlorine content is not more than 0.3% in the zinc scum, slurrying is performed in a slurry tank, and then zinc oxide is further refined through a vertical grinding process to form a zinc oxide ore pulp. The primary desulfurization part: the prepared zinc oxide ore pulp is sprayed into a primary absorption tower and reacts with sulfur dioxide in the washed flue gas of the zinc smelting system, the formed zinc sulfite pulp liquid after reaction is concentrated, the supernatant is discharged into an aerated oxidation tank, the bottom flow is subjected to filtration and the filtrate is discharged into the aerated oxidation tank, the solution after oxidation by the aerated oxidation tank is returned to the slurry tank of the zinc oxide ore pulp manufacturing part for cyclic utilization, when the concentration of zinc ion in the solution reaches to be 150 g/L, the solution is fed to a zinc purification system for further treatment, and the filter residue is sent to a zinc sulfite material bin and is subjected to the comprehensive recovery of zinc after the collocation treatment with other zinc-containing materials. The process does not produce harmful waste gas, waste residue and waste water.

The invention discloses a northern orchard ecological soil conservation fertilizing method which includes the steps: I mushroom dreg composting fermentation; II mushroom dreg compost and biological inoculant application; III land preparation; IV cyperus esculentus seed treatment; V cyperus esculentus sowing; VI cyperus esculentus intertillage; VII trace-element fertilizer application to differentfruit trees as required in a growth and development period; VIII cyperus esculentus turnover; IX mushroom dreg application, cyperus esculentus planting and turnover according to the step I to the stepVIII every year of following years. A 'cyperus esculentus green manure, mushroom dreg compost and biological inoculant' method is adopted, cover crops, organic materials and biological inoculants areused in a combined manner, a northern orchard ecological soil conservation fertilizing mode is provided, technical guidance is provided for application of the method to northern ecological and efficient fruit production, and the method is of great significance for chemical fertilizer and pesticide application reduction, agricultural production quality and efficiency improvement, agricultural ecological system quality and stability improvement, green rural construction and sustainable development.

The invention relates to a flue gas desulfurization process used for a zinc smelting system. The process comprises the following steps: preparing ZnO slurry: after zinc scum is casted, performing ballmilling, separating metal zinc, performing defluorination and dechlorination on the scum powder until the fluorine content is not more than 0.1% and the chlorine content is not more than 0.3% in thezinc scum, performing slurrying in a slurrying tank, allowing the obtained slurry to enter a vertical mill process, and further grinding the zinc oxide to form ZnO slurry; performing first-stage desulfurization: spraying a prepared ZnO slurry into a first-stage absorption tower, and reacting the ZnO slurry with sulfur dioxide in washed zinc smelting system flue gas; performing second-stage desulfurization, and performing third-stage desulfurization. The process is characterized in that zinc sulfite slurry formed after the reaction is concentrated, the supernatant is discharged into an aerationoxidation tank, after the bottom stream is filtered, the filtrate is discharged into the aeration oxidation tank, the solution obtained by oxidation in the aeration oxidation tank returns to the slurrying tank in the ZnO slurry preparation part for recycling, after a zinc ion concentration in the solution reaches 150 g/L, the material is sent to a zinc purification system for further treatment without deposition, and the filter residues are sent to a zinc sulfite bin to be treated together with other zinc-containing materials for comprehensive recovery of zinc. The process provided by the invention has no harmful waste gas, waste residues or waste water.

The invention provides a deep-sea bacterial strain capable of preventing and controlling aflatoxin, and particularly relates to a Bacillus circulans FA13 bacterial strain which is formed by separating light-yellow ooze sediment in water of 3203m in depth in South Atlantic, collected in the China General Microbiological Culture Collection Center and numbered as CGMCC No.10663. After the FA13 bacterial strain is fermented under optimized conditions and obtained fermentation supernate is diluted by 30 times, the fermentation supernate can still kill spores of aflatoxin producing bacteria and suppress producing of aflatoxin 100%, in other words, the fermentation supernate has capability of suppressing production of aflatoxin from a growing source, has no suppression effect on intestinal flora and unicellular fungus saccharomyces cerevisia and has higher using safety; active metabolite in fermentation liquid is stable in property and resistant to high temperature, acid and alkali and degrading of pepsin, trypsin and chymotrypsin. The FA13 bacterial strain and a fermentation product thereof can be used for effectively preventing and controlling aflatoxin pollution of feed, grain and field crops.

The invention discloses a proteus mirabilis phage vB_PmiP_pPm05, and an application of the proteus mirabilis phage vB_PmiP_pPm05 in the inhibition or killing of proteus mirabilis in food. The proteus mirabilis phage vB_PmiP_pPm05 is high in amplification efficiency, can be massively amplified in a short time, is wide in temperature and acid-base tolerance range, can effectively prevent and control food pollution caused by proteus mirabilis, and does not influence the texture and flavor of food.

The invention relates to the field of environmental governance methods, and particularly discloses a method for efficiently preventing and controlling cadmium pollution in a wheat-corn rotation system. The method mainly comprises the following steps: applying a fertilizer A which is composed of urea, calcium phosphate, Fe3O4@C-NH2, manganese sulfate, zinc sulfate and magnesium sulfate after wheat reviving, applying the fertilizer A in a corn seedling stage after wheat harvesting, spraying a fertilizer B which is prepared from nano magnesium sulfate, humic acid, Fe3O4@C-NH2, alkyl naphthalene sulfonate and water onto leaf surfaces of the wheat and the corn in a wheat and corn elongation stage, and spraying a fertilizer C which is prepared from nano manganese sulfate, nano zinc sulfate, humic acid, Fe3O4@C-NH2, alkyl naphthalene sulfonate and water onto ears of the wheat and the corn after the grain filling stage of the wheat and the grain flowering stage of the corn. According to the method, roots are controlled and prevented from absorbing cadmium in soil in the seedling stage, leaves are controlled and prevented from absorbing cadmium in atmospheric dust fall in the elongation stage, the ears are controlled and prevented from absorbing cadmium in atmospheric dust fall in the grain filling stage of the wheat and the grain flowering stage of the corn, and the purposes of relay prevention and control in the growth stage, crop rotation system prevention and control and prevention and control cost reduction are achieved.

The invention discloses a modified phosphate fertilizer for preventing and controlling heavy metal pollution in a farmland and an application method thereof. The modified phosphate fertilizer is prepared from modified phosphate rock powder, modified calcium magnesium phosphate fertilizer and calcium superphosphate in a certain proportion. The modified phosphate fertilizer is applied to a tillage layer before crop planting to achieve the purpose of passivating heavy metal cadmium in soil and preventing cadmium from transporting to edible parts of crops. The modified phosphate fertilizer can significantly reduce the cadmium content in the edible parts of rice, vegetables and other crops, significantly reduces the effectiveness of the cadmium in soil, and conforms agricultural products produced in the farmland with mild or moderate heavy metal pollution to food safety standards. At the same time, the modified phosphate fertilizer can provide abundant phosphorus nutrition. After applying the modified phosphate fertilizer, no phosphorus fertilizer is needed. The application amount is 30-150 kg/mu, and the cost is low.