Abstract
The sludge should have conditioning to enhance the characteristic of dewatering belong to its bad dewatering performance. The means we always use is chemical conditioning which is adding flocculants to the sludge to cooperate the machine dewatering. The single use of inorganic flocculants will increase the weight of the filtered mud cake and the results are generally not good. The synthetic organic polymer flocculants usually have good results but also have harmful effects on environment. The natural modification polymer flocculants and microbial flocculants have small adverse impact on environment with good effect in sludge dewatering and their application will be more and more widely with the development to the depth.
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