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

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 provides an intelligent paddy field surface shallow-water wetland system capable of preventing and controlling nitrogen and phosphorus loss. The system comprises a central control system, a pump station, an irrigation system, a paddy field and a water level regulating gate, wherein the central control system comprises a data acquisition and analysis module, a control base station and a signal receiver; the data acquisition and analysis module comprehensively analyzes water and fertilizer management and a growth stage of aquatic crops determines field surface water level, transmits the information to the pump station and the water level regulating gate, controls start and stop of a water pump at the pump station and regulates the water level of the water level regulating gate; the data acquisition and analysis module reduce the water level of the paddy field in advance before rainfall through combination with weather forecast, and the system produces passive drainage as little as possible; when active drainage is required, water retention time in the field is ensured not to be shorter than required time, so that flow out of a large amount of tail water containing high-concentration nitrogen and phosphorus can be avoided. By means of absorption and purification of nitrogen and phosphorus by the field, agricultural non-point pollutants are discharged out of the area to the smallest extent on the premise that stable and high yield of crops is guaranteed.

This invention discloses an automatic machine for collecting and treating medical wastewater, which comprises a water inlet pipe, a suction pipe, a medium tank, a water discharge pipe, a collection bag or a bagging machine, a valve and a negative pressure source. The water inlet pipe and the suction pipe are set above the medium tank. The water discharge pipe is at the bottom of the medium tank. The collection bag or the bagging machine is assembled on the water discharge pipe, and can be dissembled. The suction pipe is connected to the negative pressure source. Controlling valves are mountedon the water inlet pipe, the suction pipe and the water discharge pipe. Medical wastewater is sucked into the medium tank, sealed in the bag, absorbed by high-absorbency resin and turned into water gel, so the piling difficulty and leakage contamination during transportation are avoided. The method realizes automatic medical wastewater collection, suction, sealing, gelation and sterilization, thuscan avoid pollution.

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 provides a 5N grade high-purity molybdenum trioxide production process, using crude sodium molybdate containing tungsten, vanadium and other impurity elements as raw material, through multi-stage ion exchange to achieve: deep separation of molybdenum and metal impurities, molybdenum and non-metallic Impurities are separated in depth, and the obtained high-purity sodium molybdate solution is transformed to obtain high-purity ammonium molybdate solution. After the high-purity ammonium molybdate solution is formed into a solid product by acid precipitation, the whole process of closed transportation and operation is adopted to finally obtain the total product impurities. 5N grade high-purity molybdenum trioxide with content ≤10ppm. The technical parameters of the production process of the invention are precisely controlled, and the equipment and environmental pollution are strictly prevented and controlled.