154results about How to "Realize harmless disposal" patented technology

The invention relates to a long-acting organic compound fertilizer and a manufacturing method thereof, which belongs to the manure field. By taking sludge in a municipal sewage treatment plant as main raw material, adding zeolite, urea, ammonium diacid phosphate, potassium chloride and sodium silicate, then being stirred and mixed with the urea, the ammonium diacid phosphate and the potassium chloride after sludge compression, zeolite drying, stirring and mixing, natural air drying or kiln drying and grinding, and spraying the sodium silicate so as to granulate, dry, disinfect and sterilize the mixture, a product is then produced. The long-acting organic compound fertilizer and the manufacturing method solve the problem of land occupation of the sludge in the sewage treatment plant and secondary pollution, and realize the harmless disposal and resource utilization of the sludge. The fertilizer ensures that crops has good growth power, high plants, more grains, stronger lodging resistance and obvious stimulation effect and ensures that the quality of agricultural products is improved. Furthermore, the fertilizer can increase the ability of reserving nutrients in soil, can modify acid or saline alkali sandy soil, can improve soil aggregate structure, can keep fertilizer efficiency and resist crop diseases.

The present invention provides a refinery oily sludge disposal system which realizes non-hazardous treatment of oily sludge and effectively solves the problem of resource treatment and utilization of the oily sludge, the refinery oily sludge disposal system has the advantages of skid-mounted design, compact structure and small floor area, the refinery oily sludge disposal system includes an oily sludge reservoir, a quenching and tempering unit, a centrifugal processing unit, a pelletizing and drying unit, a thermal cracking unit and an exhaust gas treatment unit, the quenching and tempering unit, the centrifugal processing unit and the pelletizing and drying unit are respectively arranged on a quenching and tempering centrifugation drying integrated skid body, the exhaust gas treatment unit and the thermal cracking unit are respectively arranged on a thermal cracking exhaust gas integrated skid body, and the invention also provides a refinery oily sludge disposal method.

The invention discloses a method for producing nanosilicon dioxide and by-product hydrochloric acid through chlorosilane waste gas, and belongs to the field of chlorosilane waste gas recycling in the polycrystalline silicon industry. The method includes the steps that chlorosilane waste gas and water vapor react, gas-liquid separation is conducted on the reaction product to obtain the nanosilicon dioxide, gas obtained through gas-solid separation is cooled, most of the water vapor is condensed, part of hydrogen chloride is absorbed, the rest of the gas where gas-liquid separation is conducted is washed through hydrochloric acid and industrial water, and high-concentration hydrochloric acid is obtained. According to the method, the water vapor and the chlorosilane waste gas perform a gas-vapor hydrolysis reaction so that the nanosilicon dioxide can be obtained, and gas-solid separation is conducted on tail gas through the industrial water and the hydrochloric acid so that the concentrated hydrochloric acid can be obtained. The water vapor is mainly used as the hydrolysis reagent of the mixed chlorosilane waste gas, the high-concentration hydrochloric acid is used as absorbent, less impurity elements are brought in, and the quality of silicon dioxide and the concentrated hydrochloric acid is ensured. Harmless processing of the chlorosilane waste gas is achieved, and silicon elements and chlorine elements in the waste gas are recycled.

A harmless recycling treatment process for urban sludge carries out urban sludge treatment through the prior pulverized coal boiler and coal conveying and tail exhaust treatment systems in a power plant. In the treatment process, flue gas extracted from the front part of an air preheater of a power plant pulverized coal boiler is mixed with flue gas extracted from the back part of a power plant boiler dust remover into flue gas with the temperature ranging between 140 and 180 DEG C; the flue gas is conveyed to a sludge drier to carry out sludge drying; and the dried sludge is fed into a powerplant coal conveying system, mixed with coal, and then fed into a furnace to carry out incineration for power generation so as to realize the recycling utilization of the sludge. The coal and dry sludge are burnt in a boiler and discharged flue gas is fed into the power plant boiler dust remover and a wet desulphurization system for treatment; and the flue gas after the drying and tail gas generated by storing and conveying the dry sludge are discharged into a power plant desulphurization system for treatment, so that the standard discharge of pollutants is realized and secondary environmentalpollution is eliminated. The harmless recycling treatment process makes effective use of the prior power plant boiler and coal conveying, burning, dust removal and desulphurization facilities, and has the advantages of simple equipment, less investment, short construction cycle and low operating cost.