Compound sludge dehydrating agent as well as preparation method and application thereof

Abstract

The invention discloses a preparation method and application of a compound sludge dehydrating agent. The compound sludge dehydrating agent is mainly prepared from the following raw materials in parts by weight: 2 to 5 parts of an organic high molecular material, 10 to 15 parts of clay mineral, 30 to 45 parts of phosphate, 25 to 35 parts of metal oxide and 5 to 10 parts of an industrial byproduct. The compound sludge dehydrating agent disclosed by the invention can be used for effectively reducing the moisture content of sludge, the utilization amount is less and the effect is rapid; the moisture content of the sludge treated by the compound sludge dehydrating agent can be reduced to 40 percent to 45 percent and the volume of the sludge is reduced; meanwhile, the preparation method of the compound sludge dehydrating agent is simple and the materials are easy to obtain; the cost is low and the sludge dehydrating effect is stable; the influences on the environment are small so that the compound sludge dehydrating agent has a good market prospect in the aspect of sludge treatment.

Description

technical field [0001] The invention belongs to the field of sludge treatment, and in particular relates to the preparation and application of a composite sludge dewatering agent. Background technique [0002] Sludge refers to the solid, semi-solid and liquid waste produced in the process of sewage treatment. Its composition is complex, and it is an aggregate formed by suspended solids in sewage, microorganisms, organic substances adsorbed by microorganisms, and products of microbial metabolic activities. . . With the development of industry, the acceleration of urbanization and the development of domestic sewage treatment business, urban sludge is an inevitable product of urban sewage treatment plants. The total water treatment volume and treatment degree of sewage plants will continue to expand and improve. volume is also increasing. It is estimated that the annual sludge output of China's urban sewage treatment plants has exceeded 30 million tons. Sludge treatment and...

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Problems solved by technology

The moisture content of the sludge in the urban sewage treatment plant is still 80%-90% after being filtered by the filter press. It is difficult to quickly reduce the moisture content, and the sludge volume is very large, which hinders its subsequent treatment and increases transportation costs, affecting land use.

At present, the commonly used sludge dewatering agents include polyacrylamide, iron salt, aluminum salt, slaked lime, etc. These dehydrating agents consume a lot of sludge dewatering, and the effect is not very prominent, so a new type of effective dehydrating agent is urgently needed Sludge dewatering agent

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