Sludge dehydration conditioning agent and its preparation method and use method

Abstract

The invention discloses a sludge dehydration conditioning agent and its preparation method and use method and belongs to the technical field of environment engineering. The sludge dehydration conditioning agent is obtained by mixing calcium carbide slag, marble slag, carbides and cured sludge according to a mass percentage ratio of (4-6): (2-4): (2-4): (4-6). The preparation method comprises respectively fragmenting calcium carbide slag, marble slag, carbides and cured sludge, carrying out ball milling and carrying out mixing according to a ratio to obtain a uniform mixture. The use method of the sludge dehydration conditioning agent comprises mixing sludge and the sludge dehydration conditioning agent according to a mass ratio of 1: (0.05-0.1) to obtain a uniform mixture, carrying out standing for 1 day, and carrying out dehydration treatment on the sludge mixture to obtain sludge with water content less than 50% and pH of 5-10. The sludge dehydration conditioning agent has the advantages of low cost, simple operation and obvious dehydration effects, has a wide raw material source, can be fully mixed with sludge easily, and can effectively improve a sludge combustion heat value. The sludge treated by the sludge dehydration conditioning agent can be recycled. The sludge dehydration conditioning agent realizes sludge harmlessness, quantitative reduction and recycling application.

Description

technical field [0001] The invention belongs to the technical field of environmental engineering, and in particular relates to a sludge dehydration conditioner, a preparation method and a use method. Background technique [0002] At present, the methods of sludge treatment and disposal mainly include incineration, composting for agricultural use, land sanitary landfill, production of building materials, ocean treatment, etc. Among them, sludge incineration and landfill are the best ways to realize the reduction, harmlessness and resource utilization of sludge. The main disposal method is an ideal method in sludge disposal at the present stage, which can meet more and more stringent environmental requirements. Sludge incineration is the most thorough disposal method. After incineration, the volume of sludge is reduced by 85% to 95%, and the quality is reduced by 70% to 80%. Part of the sludge suitable for resource utilization; sludge landfill is a relatively mature technolog...

AI Technical Summary

Problems solved by technology

At present, the deep dehydration methods of sludge at home and abroad mainly include natural drying, heat source drying, mechanical dehydration, etc. Among them, natural drying relies on infiltration and evaporation to reduce the moisture content of sludge, which occupies a large area and has a slow dehydration speed. , the moisture content of the sludge in 7 days is only reduced by about 20%. It is not only easily affected by rainfall, temperature, humidity, etc., but also has a strong smell. The treatment process of rapid evaporation of medium water, at present, the thermal energy drying equipment of sludge is mostly used as supporting facilities of waste incineration plants, and the heat energy generated by waste incineration is recycled to improve the utilization rate of heat energy. After drying, the moisture content of sludge is lower than 10%. It occupies less land and is easy to control, but the investment and operation costs are high, and the requirements for management and operation technology are also high; mechanical dehydration is to pretreat the sludge, improve the dehydration performance of the sludge and then use the equipment for dehydration. At present, the most The general pretreatment method is to add inorganic salt or polymer coagulant such as quicklime, active magnesium salt, aluminum salt, etc. The water content of the sludge after treatment is between 45% and 80%, and the effect is obvious, but the dehydration effect depends on the admixture Therefore, finding a sludge dehydration conditioner with a wide source of raw materials, low cost and good effect is the focus of current research on sludge reduction, harmlessness and resource utilization