A method for deep dewatering of sludge

Abstract

The invention discloses a deep sewage dehydration method which comprises the following steps: preparing a deep inorganic sludge dehydration agent, namely recycling qualified products or wastes generated in a sintering or use process of clay bricks, and crushing the qualified products or wastes so as to obtain the deep inorganic sludge dehydration agent; carrying out a sludge prehydrolation process, namely primarily dehydrating sludge so as to obtain concentrated sludge; carrying out a deep sludge-free dehydration process to deeply dehydrate the sludge; conveying the concentrated sludge into asludge flocculation tank, powering on a stirring device to stir the sludge, putting the deep inorganic sludge dehydration agent into the flocculation tank, uniformly stirring, powering on a conveyingpump to convey mixed sludge into a filtering cavity of a plate-frame filter press, and powering on the plate-frame filter press to squeeze the mixed sludge, thereby obtaining dried sludge. By adoptingthe deep sewage dehydration method, the sludge can be dehydrated when a flocculant is not used, and a solid content of the dehydrated sludge is up to 40% or greater.

Description

technical field [0001] The invention relates to the field of sludge dewatering, in particular to a method for deep sludge dewatering. Background technique [0002] Sewage biological treatment technology is increasingly accepted and widely used, but in the process of rapid development of sewage biological treatment technology, a problem that was once ignored but now is widely concerned and urgently needs to be solved is the by-products produced in the process of sewage biological treatment - Treatment and disposal of excess sludge. [0003] The first and key step in the treatment and disposal of excess sludge is dehydration. The purpose of sludge dehydration is to reduce the moisture content of sludge, transform the sludge from liquid to solid, and achieve volume reduction or volume reduction of sludge. Create conditions for transport, disposal or recycling. At present, sludge dehydration mainly includes vacuum filtration dehydration, centrifugal dehydration and filter pres...

AI Technical Summary

Problems solved by technology

At present, sludge dehydration mainly includes vacuum filtration dehydration, centrifugal dehydration and filter press dehydration. After dehydration, the solid content of sludge is basically less than 20%. It is difficult to directly dispose or utilize sludge with 20% solid content. The method overcomes the bottleneck of sludge dewatering technology and can increase the solid content of sludge to more than 40%. In these dehydration methods, relatively high-cost flocculants are needed in the dehydration process, which makes the cost of dewatering remain high and brings great pressure to manufacturers. Comes a greater cost burden

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