Effect of the Backwashing Cycle on the Performance of a Hybrid Coagulation-Ceramic Membrane System Treating River Water

Abstract

Different membrane fouling mechanisms occur during the membrane filtration, with an initially rapid membrane permeate flux decrease and followed by a low membrane permeate flux decrease. In this study, performance of a hybrid coagulation-ceramic membrane system treating river water under backwashing cycles of 30 minutes and 2 hours was investigated. The backwashing cycle was chosen corresponding to the rapid membrane permeate flux decreasing period and the following low decreasing period. The results showed that a backwashing cycle of 2 hours could improve the removal efficiency of total organic carbon while not UV254. The system removed turbidity efficiently under all the conditions, and the particles in the effluent mainly had size in the range of 2-5 µm. During the long-term operation, the membrane permeate flux also decreased rapidly during the initial period and then followed by a slow decreasing period. The backwashing cycle of 2 hours maintained a relatively high membrane permeate flux than that of 30 minutes
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