Enhanced coagulation is recommended as the best available technology for NOM control by USEPA. Applying increased dosages of coagulant and pH adjustment are two common recommended options to enhance NOM removal. However, both of these methods have some disadvantages.

Our group have studied the mechanisms of coagulant hydrolysis and the interaction between NOM and coagulant hydrolyzed products in coagulation processes. Based on the new view of coagulation mechanism, the target and techniques for NOM removal by enhanced coagulation for Chinese water treatment plants were rendered. Some new high efficient coagulant agents were developed, e.g. Composite polyaluminum chloride (HPAC) which has 30% higher efficiency than traditional coagulants, and was industilized and widely used in several urban water treatment plants in Beijing and Tianjin, China.