A conditioning method for high-dry sludge dehydration

Abstract

The invention discloses a regulation method for high-dryness dehydration of sludge. The method comprises the following steps: sludge in a sludge digestion tank is conveyed to a sludge regulation pool through the gravity action or by a conveying pump, then a ferric chloride solution and quick lime are added into the regulation pool by virtue of a chemicals feeding pump, a mixer is used for mixing through sensing the liquid level, and sludge is fed into a plate and frame filter press from the regulation pool after the regulation is over. The method is a regulation method, based on which sludge and conditioners are mixed uniformly and the sludge mechanical dehydration performance is remarkably improved.

Description

technical field

[0001] The invention relates to a conditioning agent and a conditioning system for high-dry dehydration of urban sludge, belonging to the field of environmental engineering. Background technique

[0002] By the end of 2011, a total of 3,135 urban sewage treatment plants had been built in cities and counties in my country, with a sewage treatment capacity of 136 million m 3 d －1 , produces nearly 22 million tons of dewatered sludge (80% water content) annually. Since the urban sludge in our country is mainly the residual sludge discharged from the secondary biochemical treatment of the sewage treatment plant or the mixed sludge mixed with the primary sedimentation tank, it has high organic matter content, strong hydrophilicity, and uneven particle size distribution. Therefore, the mechanical dehydration is performed directly, and its dehydration performance is very poor, which brings many problems to its handling and operation.

[0003] At present, there ar...

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