With the condition of water-pollution becoming more and more serious,the purifying treatment of water becomes more and more important.Among the methods of treatment,flocculation has been paid more attention.However,the selection of flocculants is the decisive factor.Flocculating agents include inorganic flocculants,organic flocculants and microbial flocculants according to their different chemical components.The organic flocculants are widely used for their little dosage,fast flocculation and free effect of...