Adaptability of ultrafiltration and its pretreatment process in three types of feed water

In order to get the best performance of ultrafi ltration (UF) process in the pilot test, this paper chooses the appropriate coagulant for coagulation process used as the pretreatment of UF process, investigates the key infl uence factor of coagulant dosage, membrane fouling and permeability, and proposes a method to optimize the operation parameters of UF process. In this study, UF module is fed with three different types of raw water to verify the adaptability of UF membrane. The results indicate that polymer ferric sulfate (PFS) is the appropriate coagulant for low temperature seawater due to its economical efficiency and good coagulation performance, and the content of the silica in the raw water is the key infl uence factor of coagulant dosage. During the UF process, the UF membrane module (SXL-225 FSFC) could offer the permeate of stable quality characterizations, which meets the feeding requirement of RO. But the key influence factor of the membrane fouling is not the temperature but the components of feed water, especially the content of silica and other colloids.