| The sludge is leavings of the deposit and the foam in the process of disposing the sewage. It is the second production. With the development of the economic in our country and the increase of the population the pollution becomes more and more severity. The output of the sludge also increases with large rang which needs to be disposed.So it is very important that using the physics or chemical method to change the character of the sludge and made it dehydration easily. By research of the sludge sedimentation and the dehydration , get the most compatible flocculating agent and the best conditions which provide the parameter for the engineering design and the management during the pretreatment of the sludge.In this paper, sludge of experiment is come from New District wastewater plant of SuZhou and pilot scale of water plant of TaiHu. The experiment of freeze/thaw treatment is carried out under artificial condition to explore the factors that influence the curing of sludge. Comparing the dimension of sludge and analyzing the efficiency of dewatering and settleability of treated sludge show that sludge-dewatering is optimal at -12℃in this experiment, firm content is more than 10%, and is up to 30% after vacuum filtration, moisture content of filter cake is about 66.5% .The experiment indicates that sludge specific resistance of wastewater sludge change more significant than that of aluminum sludge.This study can enrich freeze-thaw theory, extend the application field of freeze–thaw in environmental engineering, the application of freeze-thaw in sludge treatment and pollution remove is helpful to boost, create the new field freeze-thaw.
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