1262results about How to "Pollution control" patented technology

The invention relates to a method for realizing harmless comprehensive treatment of human excrements through adopting biotechnology, in particular to a comprehensive technology used for the harmless centralized treatment of human excrements in urban areas. The method comprises the following steps that: (1) human excrements, aquatic plants and terrestrial plants are added in a fermenter, and then a composite strain mixed solution of microzyme, bacillus and lactobacillus is fed into the fermenter so as to carry out aerobic fermentation and anaerobic fermentation in turn; (2) the biogas generated during fermentation is fed into a biogas generating set so as to generate electricity; (3) the products after fermentation undergoes solid-liquid separation, and the solid fermentation products are made into solid organic fertilizer through dewatering, drying, preparation and regranulation; (4) the liquid fermentation products is obtained after solid-liquid separation undergo decoloring, filtration and settlement layering, in the liquid, the sublayer liquid in the solution is made into liquid organic fertilizer through coarse filtration, secondary filtration, sterilization and preparation and the supernatant is made into rinsing meeting effluent standard through aeration and settlement filtration. The method can realize clean, environment-friendly and energy-saving ecological production.

The invention discloses a construction material produced from industrial residue, aims to provide a construction material having the advantages of light weight, sound insulation, heat insulation, low cost, fire resistance, dense products, high rigidity and the like, and solves the problems with land occupation and pollute environment of phosphate slag and phosphogypsum at the same time. the invention is realized through the following technical scheme: phosphate slag and phosphogypsum are used as raw materials for producing the construction material, which comprises the following components by the weight part: 35 to 65 parts of phosphate slag, 10 to 40 parts of phosphogypsum, 5 to 15 parts of lime, 15 to 28 parts of cement, 0.1 to 0.4 part of light aggregate, 0.02 to 0.05 part of soluble glass, 0.02 to 0.05 part of water-reducing agent, 0 to 0.004 part of retarding agent, 0 to 0.005 part of early-strength admixture, and 0 to 0.008 part of foam killer; the components are weighed by the formula weight part and added to a blender; water is added to the blender with the water-to-material proportion being 4 to 10 and mixed evenly with the materials; and the solution is cast into a die and natural air dried after molding. Dies with different structures can be used according to purposes to conduct cast molding. The construction materials such as wall plates, guardrail decoration pillars, door and window sleeves, vase sleeves and the like can be produced.

The invention discloses simultaneous removing device and method of various pollutants by an electrocatalytical oxidation combining lime-gypsum method. The device comprises a spraying and cooling device, an electrostatic enhancement reactor, a Venturi device, a double-circulation integrated absorption tower of various pollutants and a wet type electrostatic defroster, wherein after smoke is cooled by the spraying and cooling device, the smoke enters the electrostatic enhancement reactor and is subjected to corona discharge processing in a corona discharge area formed in the electrostatic enhancement reactor; the processed smoke enters the double-circulation integrated absorption tower of various pollutants and is sprayed to remove dust and absorb in the absorption tower; and the purified smoke sequentially enters a corrugated plate defroster and the electrostatic defroster on the upper part of a spraying tower so as to remove aerosol in the smoke. The invention has the advantages that various pollutants can be simultaneously removed, and meanwhile, the pollution of fine granules and the aerosol can be effectively controlled; various pollutants can have higher removal efficiency; and the removal and the absorption of by-products cannot cause secondary pollution to environment.

The invention discloses an ecological combined treatment method and device for rural distributed sewage. The method comprises the steps of A) rural sewage collection and pretreatment; B) treatment by a biological filter; C) treatment by an artificial wetland and a stabilization pond; D) ecological landscape configuration. The device is characterized in that a main water inlet pipeline is respectively connected with a lattice pool and a regulation pool, the regulation pool is connected with a horizontal flow biological filter through a water distribution pipe, the horizontal flow biological filter is connected with a vertical flow biological filter through a filter screen-water distribution pipe, the vertical flow biological filter is connected with a first-level artificial wetland via a perforated water collection pipe which is horizontally arranged, the first-level artificial wetland is connected with a second-level artificial wetland through an overflow weir, the second-level artificial wetland is connected with the stabilization pond through a straight flow water drain pipe, and a main water drain pipe is arranged at the tail end of the stabilization pond. According to the method, energy consumption is not required, the operation and the maintenance are simple and convenient, and the method further has the advantages of landscape effect, economic benefits, simple structure and low investment; high-efficient purification of rural distributed domestic and farming sewage is realized, and the removal rate of nitrogen, phosphorus, COD and the like in sewage is above 80% after treatment.

The invention relates to a manganese residue compound fertilizer and a preparation method thereof. Manganese ore leached residue is used as the main raw material, a carbonate-containing fertilizer is added to convert calcium sulfate in the manganese residue into calcium carbonate, and the manganese residue compound fertilizer is prepared from the manganese residue containing the calcium carbonate, the lignin-containing additive, and one or more of nitrogen fertilizer, phosphate fertilizer and potash fertilizer. The carbonate-containing fertilizer and the lignin-containing additive can effectively prevent soil from packing together, keep the acid-base balance in soil, and enhance the fertilizer efficiency. The invention can effectively utilize abundant manganese residue generated in electrolytic manganese industry, and provides an effective way for recycling manganese residue.

The invention discloses an additive for improving utilization ratio of silicon crystal line cutting mortar as well as a preparation method and application method of the addictive. The additive is composed of the following raw materials in percentage by weight: 50-96.5% of polyethylene glycol, 1-10% of penetrating agent, 1-20% of ether alcohol surfactant, 0.5-10% of extreme pressure resistant chelator and 1-10% of assistant detergent. The preparation method comprises the steps of weighing and mixing the raw materials. The application process comprises the following steps: 1. carrying out the first line cutting the mortar and recovering the mortar; 2. adding the additive: adding the additive to the recovered mortar after the first linear cutting based on the weight ratio of 1:100 plus / minus 10, and then evenly stirring; 3. carrying out the second line cutting; and 4. carrying out the third line cutting and recovering the mortar. The addictive is reasonable in design and has good use effect and practicable value, addictive preparation and use processes are simple, operation is convenient, and the defects of the existing silicon wafer cutting fluid such as more severe pollution, higher rejection rate, high production cost, low utilization ratio and the like can be overcome.

The invention discloses a zearalenone toxin gradation enzyme and a coding gene and application thereof. The enzyme is derived from Gliocladiumroseum and is protein in (a) or (b): (a) protein consisting of an amino acid residue sequence of SEQIDNO: 1 in a sequence table; and (b) protein which is derived from the SEQIDNO: 1, has a zearalenone degradation activity and is formed through carrying out substitution and / or deletion and / or addition of one or a plurality of amino acid residues on the amino acid residue sequence of SEQIDNO: 1 in the sequence table. The zearalenone toxin degradation enzyme has highly-efficient degradation effect on zearalenone (ZEN).

The invention discloses an environment-friendly slow-releasing long-standing compound fertilizer which belongs to polyelement compound fertilizer and a production method thereof. The fertilizer comprises the following raw material ingredient (by parts by weight): 10-40 parts of powdered rock phosphate, 10-40 parts of potassium feldspar, 15-40 parts of coal gangue, 10-20 parts of magnesite powder, 10-30 parts of nitrogenous fertilizer, 8-18 parts of swell soil, 1-3 parts of kieselguhr and 0.3-1 part of trace element; the powdered rock phosphate, the coal gangue and proper amount of coke are roasted for 8-16 hours at 500-800 DEG C, cooled, crushes and screened by a 60-mesh sieve. The invention provides an environment-friendly energy-saving fertilizer capable of improving soil with comprehensive effective fertilizer composition, slow releasing and high fertilizer utilization ratio. Meanwhile, the environment-friendly slow-releasing long-standing compound fertilizer is suitable for various soils and growth of various crops and the preparation method thereof is provided. The problems of low fertilizer utilization ratio, environment pollution, hardening soil, high production cost and the like in the prior art are solved.

The invention relates to an iron-carbon micro-electrolysis-dynamic membrane wastewater deep treatment process. The process comprises the following steps: pretreating pollutants in industrial wastewater by iron-carbon micro-electrolysis so as to remove partial pollutants and improve the biochemical performance of the wastewater; then, carrying out microorganism degradation by mainly using mixed liquids in a hydrolysis acidification pool and an aerobic dynamic membrane reaction pool so as to remove the pollutants; and finally, completing the solid-liquid separation and water discharge process of the mixed liquid with a dynamic membrane assembly. The invention aims at providing the iron-carbon micro-electrolysis-dynamic membrane wastewater deep treatment process which is simple in process flow and efficient; the process can be effectively used for removing the difficultly-degradable organic substances in the industrial wastewater and improving the biochemical performance of the wastewater, and has obvious decoloring effect and good solid-liquid separation effect; the effluent is clear and does not contain suspended particles; and the process is suitable for standard-reaching discharge and deep treatment of various industrial wastewaters (such as dyeing and printing wastewater, pharmaceutical wastewater, heavy metal wastewater, coking wastewater, paper-making wastewater and the like), and the index of the quality of the treated effluent can meet the water quality standard of reused water.

The invention belongs to the technical field of fertilizers and specifically relates to a water-retention and slow-release fertilizer. The water-retention and slow-release fertilizer comprises the following raw materials in parts by weight: 70-80 parts of coated slow-release fertilizer or low-solubility slow-release fertilizer, 15-20 parts of water retention agent, 1-2 parts of biological bacteria, 5-10 parts of humic acid and 5-15 parts of soil conditioner. The prepared water-retention and slow-release fertilizer disclosed by the invention has the advantages of low cost and simplicity and convenience in application, and can adjust the water absorbency of the fertilizer according to different crops, soil, climate and other conditions and be widely applied to grain crops, cash crops, horticultural plants and the like. The water-retention and slow-release fertilizer disclosed by the invention has long effective period, and can greatly reduce the loss of the fertilizer caused by volatilization and eluviation, enable the limited fertilizer and water to be fully absorbed and utilized by the plants, achieve the integration of the water and the fertilizer and improve the soil. Through the application of the water-retention and slow-release fertilizer, the irrigation cost of farmland can be reduced and the high-efficient water conservation purpose can be achieved. The water-retention and slow-release fertilizer disclosed by the invention can greatly improve the utilization rate of nutrients and effectively control the pollution of the crops and an environment caused by the application of the fertilizer.

The invention discloses a cellulose acetate / nano titanium dioxide mixed media hollow fiber positive osmotic membrane. 0.05-4.0% (w / w) of nano titanium dioxide and 0.01-1.0% (w / w) of oxidized graphene are added into a solution composed of N-methyl-pyrrolidone or dimethylacetamide or dimethylformamide and 1,4-dioxane, 3.0-21.0% (w / w) of additives is added, uniform stirring is carried out for 5-60min, then 15.0-40.0% (w / w) of cellulose acetate is added, full stirring is carried out at a temperature of 20-70 DEG C, the mixture is allowed to stand, and a hollow fiber positive osmotic membrane is obtained through spinning. The osmotic membrane employs 1M of NaCl as a drive liquid and deionized water as a raw material liquid, the water flux is 16.5L / m2h, the reverse salt flux is less than 3.5g / m2h, and the contact angle is 60.2 degrees in test time of 1h.

The invention relates to a dust inhibiting agent used during the railway transportation process of powdered materials and a preparation method thereof, the dust inhibiting agent comprises the following raw materials: polyvinyl alcohol, starch, polyacrylamide, carboxymethyl cellulose, natural plant glue, a surfactant, an antifreeze auxiliary agent, and a bacteriostatic agent. The dust inhibiting agent provided by the invention can inhibit the dust pollution brought by railway transportation of powdered materials, especially inhibits the PM 2.5, is capable of solving the antifreeze problem when using the dust inhibiting agent in winter, and achieves the goals of safety and environment-friendliness.

The invention relates to the technical field of a paddy rice planting method, in particular to an environment-friendly nuisance-free paddy rice planting method. The method comprises the following steps: tilling a field, that is, tilling a field for planting the rice and applying a biogas fertilizer to the paddy field; preparing seeds and raising rice seedlings, that is, selecting a high-quality rice variety with compact plant shape, strong resistance and high yield, then sterilizing and soaking the seeds for seeding use, or soaking the seeds and raising the seedlings for transplantation; seeding the rice seeds or transplanting the raised rice seedlings; driving green ducks which are 18-20 days old or adult ducks to the paddy field within 25-40 days after the rice seedlings come out or 10-20 days after the rice seedlings are transplanted by throwing; driving the ducks from the paddy field or feeding the ducks in a duck shed in the paddy field to prevent the ducks from eating immature rice grains and resulting in yield reduction when the rice seedlings are in a milk ripe stage and a dough ripe stage; and harvesting the rice grains after the rice grains become mature. In cultivation and field management, the method helps scientifically manage various links of paddy rice growth, effectively control pest damages to the paddy field by feeding the ducks in the paddy field in different rice growth periods, thus promoting ecological balance, controlling pesticide pollution, ensuring good agricultural environment and promoting yield increase of the rice.

The invention discloses a cellulose acetate / functionalized graphene mixed media hollow fiber positive osmotic membrane. 0.05-3.0% (w / w) of graphene is added into a solution composed of N-methyl-pyrrolidone or dimethylacetamide or dimethylformamide and 1,4-dioxane, 2.0-20.0% (w / w) of a polyethylene glycol or polyvinylpyrrolidone / lithium chloride composite additive with a volume ratio of 7:1 is added, stirring is carried out for 15-60min, then 10.0-35.0% (w / w) of cellulose acetate is added, stirring is carried out, the mixture is allowed to stand, and a casting film solution. The casting film solution is squeezed into an annular gap of a nozzle, goes through an air gap of 2-20cm, and goes into deionized water with a temperature of 20-60 DEG C, solidification is carried out, and a positive osmotic membrane is obtained after washing. When 1M of NaCl is employed as a drive liquid and deionized water is employed as a raw material liquid, the water flux is 18.3L / m2h, the reverse salt flux is less than 3.3g / m2h, and the contact angle is 57.5 degrees.

The invention discloses a plasma evaporation deposition lanthanide thermal barrier coating ceramic layer with a long service life, a high insulation performance and a composite structure, and a preparation method thereof, and belongs to the technical field of thermal barrier coating. The ceramic layer material comprises lanthanum zirconate or cerate; the thermal barrier coating comprises a bonding layer, a first ceramic layer and a second ceramic layer which are prepared on a base body, wherein the first ceramic layer adopts a YSZ coating; the second ceramic layer comprises the lanthanum zirconate or cerate; in the preparation method of the ceramic layer, the pressure of a vacuum chamber is lower than 1 mbar; through adjusting parameters of spraying electric power, current, gas flow rate, temperature of the basal body, powder feeding rate, spraying distance and the like, the YSZ coating layer and the lanthanide thermal barrier coating ceramic layer which are provided with microstructures of columnar crystal structures, layered structures, layered structures and columnar crystal structures, or nano- structured coating and the like can be obtained. The service life of the thermal barrier coating is long and the heat-insulating property is favorable.

The invention discloses an anti-seepage system and a landfill structure. The anti-seepage system is applied to landfills, and comprises an anti-seepage layer, a liquid and gas flow guide layer and a pre-drained liquid filtering layer, wherein the anti-seepage layer is a waterproof breathable granular layer; the liquid and gas flow guide layer is arranged above the anti-seepage layer; and the pre-drained liquid filtering layer is arranged above the liquid and gas flow guide layer and is a permeable brick layer. The landfill structure comprises an underground soil layer, the anti-seepage system, a waste layer and an earth surface soil layer, wherein the anti-seepage system is laid on the underground soil layer; the waste layer is positioned on the anti-seepage system; and the earth surface soil layer is embedded above the waste layer. Water-proof breathable sand is used as a main anti-seepage material, the water-proof breathable sand has water-proof breathable function, solves the problems that waste produces toxic gas and prevents soil and underground water from being polluted by percolate; and the anti-seepage material is a flexible material, does not produce cracks under the action of shearing force of the stratum and can effectively keep the anti-seepage effect.

The invention discloses a method for removing smelly substances in water, which comprises the following steps: 1. preparing an inorganic nano catalyst, an organic high-polymer basal film material, additives, a solvent and the like into a film casting solution at certain temperature, and preparing a flat or hollow-fiber or tubular inorganic-organic hybrid photocatalytic separation film; and 2. putting the inorganic-organic hybrid photocatalytic separation film on a film filter unit, and filtering smelly-substance-containing water to be treated in a dead end filtering or cross-flow filtering mode under the conditions of a proper light source. The photocatalytic unit and the film separation unit which are mutually independent are organically fused into one unit for operation, and thus, the invention can simultaneously have the advantages of both photocatalysis and film separation. The method disclosed by the invention has the advantages of simple technique, no need of reagents, high operation reliability, compact equipment and easy automatic control; and the method can effectively remove smelly substances in water, reduce the film pollution, prolong the service life of the film, and lower the technological cost.

The invention relates to a preparation method for a graphite type carbon nitride nano-rod modified electrode and application of the graphite type carbon nitride nano-rod modified electrode in the photoelectric chemical detection of copper ions, belonging to the technical field of detection of metal ions. A photoelectric chemical detector is a three-electrode system, wherein a reference electrode in three electrodes is a saturated calomel electrode, an auxiliary electrode is a platinum electrode, and a working electrode is graphite type carbon nitride nano-rod material modified ITO (indium tin oxide) conductive glass. The photoelectric chemical detector has high sensitivity, selectivity and anti-interference capability, and can be used for rapidly detecting metal ions, and the application fields of graphite type carbon nitride are widened.

The invention relates to a method for breeding adult crabs in rice fields. In the method, a rice, one-year crab species and soybean triune three-dimensional ecological planting and breeding model is adopted. The method has the following advantages that: the method is a new planting and breeding technology which improves the rice and crab symbiosis entironment and realizes pollution-free and eutrophicating rice and crab products by utilizing the mutual control and mutual promotion effects of the biological chains formed among such living beings as rice, pests, river crabs and the like according to organic combination of growth regularity of rice and the living beings; space, land resources and water resources are reasonably utilized and three-dimensional production of the rice fields is realized; and the regulation behavior of the natural ecosystem is simulated in the artificial ecosystem, diseases, pests and weeds in the rice fields are controlled by breeding crabs in the rice fields, ecological equilibrium is promoted and pesticide pollution is controlled, the rice yield can be increased, the agriculture cost can be lowered, increase of income of the farmers can be realized and the resource-conserving and environment-friendly ecological agriculture capable of realizing sustainable development is realized.

The invention discloses a quick and intensive straw management method based on ecological conversion via housefly metabolism. The method comprises the following steps of: housefly species collection and clean breeding and acclimatization, induction and stabilization of straw conversion adaptation housefly strains, breeding of cellulose high expression housefly strains, pretreatment of straw housefly maggot bioconversion, stabilization of industrialized straw conversion housefly strains, and production of industrialized housefly maggot products. Compared with the prior art, the method has the advantages that biotechnologies are adopted for functional induction and filtration of seed maggot straw ecological conversion, passage and engineered cultivation, a machinery crushing method and a biofermentation technology are adopted, and a modernized engineering means is adopted, so that intensive straw management based on microbe fermentation and insect metabolic conversion is realized. Compared with other methods, the method provided by the invention has the advantages of high ecological degree, high bioavailability, short rotten period, high product quality, high extra-value output of resources, non-environmental pollution, and scientific proportion and high fertilizer efficiency.

The invention relates to a blue algae water bloom active carbon and a preparation method thereof. The active carbon is produced by drying the blue algae water bloom alga mud at the hign temperature of 250 to 600 DEG C for 0.5 to 2 hours. The invention starts a new trail for utilizing the blue algae water bloom as a resource. The method can effectively produce active carbon with blue algae water bloom, which can not only save resources but also is favorable to protect the ecological environment and finally the purpose of treating pollution and reducing the pollution treatment cost can be realized.

The invention provides a device and a method for cleaning hydraulic pipelines, in particular to a nitrogen purging device (cleaning device) for hydraulic pipelines, which has good cleaning effect, high efficiency and not pollution. The nitrogen purging device for hydraulic pipelines adopts the structure that a gas drier used for the drying treatment of nitrogen, a gas filter used for the filtering treatment of nitrogen and a flow control valve used for regulating the output flow of nitrogen are connected in series on an output pipeline which is connected with a nitrogen source. In addition, the cleaning method for hydraulic pipelines adopts nitrogen after being dried and filtered to purge the hydraulic pipelines.

The invention belongs to the field of medical biological technique and discloses a method for digitally detecting micro-mutation by using a micro-emulsion clone amplified bound water gel microsphere chip. The method detects the micro-mutation by combining the microsphere mediated micro-emulsion clone amplifying technique with the water gel chip fixing microsphere fluorescence detection and digitization analysis techniques. The method promotes the positive relevance ratio of micro-mutation, has low cost, high sensitivity and fine specificity and is applied to quantitatively measuring micro-mutation of various low abundance tumor relative genes.

The invention provides a method of a pulse-jet membrane bioreactor and a device for realizing the method. The method adopts a jet aerator to replace a traditional blower to realize the cross-flow scouring effect of membrane components; wherein, circulating fluid flows through the jet aerator at high speed; air enters the jet aerator in a pulse way by a valve controlled by PLC and jets at the bottom through a gas spreading distributor; the PLC system regulates the cross-flow state of gas-liquid two-phase flow on the membrane surface by changing circulation flow rate and pulse frequency, so as to improve the scouring effect of the air to the membrane surface, to further control membrane pollution, to improve the energy utilization efficiency of a circulating pump and to reserve energy. The use of the jet aerator also increases the utilization efficiency of oxygen and improves sludge degradation effect. The device has the advantages of low operation energy consumption and low operation noise, slight membrane pollution, less early investment in equipment, simple structure of the device, small occupation area, simple and convenient operation and convenience in automatic running and control.

The invention relates to a squeezing type sludge dehydrating device and operation method, belonging to a technical field of sludge dehydrating device. The device comprises a housing, a material vat, and a hydraulic cylinder, wherein the material vat and the hydraulic cylinder both are arranged on the housing, the hydraulic cylinder is arranged above or below the material vat; the material vat is cylindrical, the upper end of the material vat is open and the lower end is closed, water outlet holes are distributed on sidewalls of the material vat; the upper end of the material vat is provided with a press plate that is matched with the inner diameter of the material vat, the back of the press plate is connected with the piston of the hydraulic cylinder or the slide plate at the upper part of the housing, the housing is provided with a locator, the material vat is arranged fixedly on the chassis of the housing, the upper part of the material vat is provided with a material inlet; a water baffle disc is arranged at the bottom of the material vat; the hydraulic cylinder is provided with a hydraulic oil pipe, when the hydraulic cylinder is started, the piston of the hydraulic cylinder drives the press plate to move in the material vat or drives the material vat to move upwardly, so as to apply force on the sludge in the material vat, when the sludge in the material vat is squeezed by the press plate repeatedly , the water content of the sludge is reduced.

The invention relates to a method for recycling arsenic-containing waste residues, which comprises the two steps of the alkaline leaching of the arsenic-containing waste residues and acid-washing separation of extract. The method comprises the following specific steps of: mixing the arsenic-containing waste residues, an inorganic strong alkaline solid and an alkaline leaching medium according to a certain ratio, reacting for 10 to 180 minutes by mechanically stirring and then filtering, and performing safe landfill in the subsequent process, wherein compared with the quality of non-processed residues, the quality of filter residues is reduced by 80 to 98 percent; adding filter liquor into concentrated acid for acid washing at the temperature of between 10 and 25 DEG C for 1 to 2 hours, wherein the added amount of an acid-washing medium is 5 to 10 volume percent of the alkaline leaching solution; filtering the mixture, and after washing filter residues with 0.02 to 1 percent dilute acid, drying to obtain As2O3 powder (the purity is over 95 percent); and returning acid-washing filter liquor and dilute acid washing liquor to the alkaline leaching step. The method has the advantages of simple process, convenience of operation, low cost, small secondary pollution and the like, and at the present, arsenic-containing waste residues pour in the environment, the method has the obvious economic, social and environmental benefits.

The present invention discloses an ecological fertilizer, a preparation method of the ecological fertilizer, and an application of the ecological fertilizer in agricultural or forestry production, and belongs to the fields of agriculture and forestry. According to the present invention, the ecological fertilizer adopts raw fertilizer as the core, an organic coating liquid, plant probiotics, medium element additives and microelement additives are coated on the outer of the core. Compared to the prior art, with the ecological fertilizer provided by the present invention, according to different nutrient requirements of crops in different growth stages, a lot of nutrients can be long-acting and balancedly provided for the crops, the sensitive medium elements and the microelements are added to the special products of different crops, and the generations of the nutritional deficiency symptoms of plants, vegetables and other crops can be controlled.

The invention relates to a double cropping rice nitrogen-saving high-yield production method. A double cropping rice planting region is selected; 15 to 30 days before late rice is harvested, astragalus sinicus planting is carried out; after the late rice is harvested, ditching is carried out according to an astragalus sinicus planting technology; 30 to 50kg of calcium magnesium phosphate fertilizer is applied per mu; 1 to 2kg of potassium chloride used as a base fertilizer is applied per mu; 10 to 15 days before early rice is transplanted, dry tillage and plowing pressing are carried out; land preparation is carried out according to the early rice planting requirements; azolla is bred; and after shoal water of field water, which has a height of 1.5 to 3.5cm, is kept for 8 to 10 days, the base fertilizer is applied to carry out early rice transplanting. During growth of the early rice and the late rice, duckweed utilization is naturally carried out; before the late rice is transplanted, a sustained-release nitrogen fertilizer is applied in one step as the base fertilizer; and on mid-to-late September in the next year, circulation operation of farming of planting astragalus sinicus green manure crops and the like is carried out. According to the invention, astragalus sinicus green manure is planted during the slack winter season of double cropping rice planting, the azolla is bred during growth of rice, the rice special sustained-release nitrogen fertilizer is applied to the late rice in a decreasing manner, the astragalus sinicus and the azolla are utilized to fix nitrogen and adsorb carbon, the land is maintained by the land, organic materials and an organic nitrogen source are provided for rice, nutritive substances in the double cropping rice field, which are easy to loss, are adsorbed, non-point source pollution is reduced and fertilizer supply and the fertilizer requirement of rice are coordinated and consistent.

The invention provides a flue gas desulfuration control system for large coal-fired power plant and comprises an imaginary machine part which is a flue gas desulfuration simulation platform, a DCS control system which comprises control points arranged at in-site in a scattered way as well as working stations, monitors, printers, data servers and dual redundant optical fiber circular communication networks used for interconnection of the components; a real electricity part which is a real electricity part for flue gas desulfurization simulation platform and comprises an in-site input signal collection system, an in-site measurement and control instrument and an executing mechanism for simulation platform output signal. In addition, the real electricity part collects simulation signal and state of device coherent with in-site signal and sends into the flue gas desulfuration simulation platform through the DCS control system for performance check and control operation, and then outputted signal gets into the executing mechanism through the DCS control system and control of real device is realized. The invention is good for research and development of process, new technology and electrically controlled device of large desulfuration device, and then effectively controls carbon dioxide pollution of atmosphere and protects environment.

The invention discloses a method for recycling upper part residual coal and backfilling a goaf by utilizing full-mechanized caving mining in an extremely thick coal seam, and belongs to the field of coal mining. The method is specific to the extremely thick coal seam and is a green method which can be used for recycling the residual coal effectively and specifically comprises the following step: on the premise of determining the height of a caving zone, combining the operations of repeatedly mining upper part abandoned coal or residual coal, preliminarily screening in a pit and backfilling the goaf with gangue. According to the method, residual coal resources are effectively recycled, and environmental pollution caused by transporting the gangue to the ground is avoided, and the problem of surface subsidence is effectively solved.