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Coagulation Mechanism and Coagulant Development Status at Home and Abroad

ZHENG Yi1,DING Yue-tang2,LI Feng3,LIU Yi-man1, SUN Jing-mei1(1.School of Environment Science and Technology,Tianjin University,Tianjin 300072,China;2.Qingdao City Drainage Administration,Qingdao 266071,China;3.Tianjin Construction Design Institute,Tianjin 300074,China)  
Development of new coagulants or combination of various coagulants to enhance the coagulation process is a new problem faced by many present water treatment plants after implementation of the Water Quality Standards for Urban Water Supply(CJ/T 206-2005).Therefore,the coagulation theory,coagulant development and application status at home and abroad were analyzed systematically.It was brought forward that extraction of bio-coagulants, co-coagulation of combined coagulants and coagulation models based on the typing theory would be the trend of coagulation theory and coagulant development in the future.
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