A kind of high-efficiency sludge dewatering method

Abstract

The invention discloses an efficient dehydrating method for sludge. The method realizes automatic and efficient operation of a sludge treatment system through a self-control system. The method comprises the following steps: first, pre-concentrating sludge by means of a natural gravitational field or a manual gravitational field generated by machinery (by adopting concentration or floating manner); adding an inorganic conditioner in the sludge tempering process for further pre-treatment; and dehydrating by means of filter pressing equipment which is higher in pressure to further improve the dehydrating effect so as to efficiently dehydrate sludge in an urban sewage plant. The method can remarkably reduce the moisture content of sludge, reduce the volume of sludge, improve the sludge character, solves the difficulty in conveying and storing the sludge and lower the disposal cost of the sludge, thereby laying a good foundation for final disposal and utilization of the sludge.

Description

technical field [0001] The invention relates to a method for treating sludge in an urban sewage plant, in particular to a new method for efficiently dehydrating sludge in an urban sewage plant. Background technique [0002] With the acceleration of urbanization and increasingly stringent environmental standards, investment in environmental governance has been greatly enhanced. In recent years, a large number of sewage treatment plants have been built in China, and the amount of sludge produced has increased year by year. By the end of 2011, 3,135 sewage treatment plants had been built nationwide, with a sewage treatment capacity of 136 million m 3 d -1 ; It is estimated that in the next five years, 27 million tons of sludge with a water content of 80% will be produced every year. Sludge is a kind of solid waste with complex composition. If it is not properly treated and disposed of, it will cause great environmental hazards. Since the sludge with high moisture content is ...

AI Technical Summary

Problems solved by technology

Take the sludge dewatering method of Xiamen Water Affairs Group Co., Ltd. as an example: a sludge dehydration method, CN101691272B, in which the sludge stagnates in the gravity thickening tank for a long time, and the moisture content of the sludge after chemical conditioning is still higher than 95 %, because the water content of the sludge after conditioning is relatively higher than that of this method, if measured by the same volume of filter press sludge, the amount of sludge with the same water content produced by this method is less than that of this method. That is, the sludge treatment efficiency of this method is lower than that of this method

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