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Abstract
The objective of this paper is to explore the synergistic combination of coagulation with biological processes for drinking water treatment on the basis of on‐site biofilters and jar tests. Three raw water sources in China were tested. Zeta potential was chosen as a major parameter. Experimental results indicated that biological processes can result in significant change of zeta potential of water flow, making the zeta potential of effluent less negative than that of raw water. The observation of biofilm morphology with scanning electronic microscope showed that the biofilm is in the shape of a cobweb and can hold a large number of turbidity particles. The combination of biotreatment with coagulation can enhance process efficiency and save coagulant significantly. Results in this paper suggested that further explorations are needed to determine the best support medium for biofilm growth and the best combination of coagulation with biotreatment in different situations.