科研之友
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摘要
In recent years, the shortened process with ultrafiltration (UF) membrane has shown excellent performance due to its small land use and high water purification efficiency. However, severe membrane fouling was induced by microorganisms after long time operation. Therefore, the corresponding behavior of UF membrane fouling was investigated with ultraviolet (UV) pretreatment. The results showed that UV pretreatment (180 μW?cm-2) could effectively slow down the bio-pollution. The dead/live rate of microorganisms in the membrane tank increased from 39.90%/60.10% to 66.40%/33.60% after running for 60 days. The concentration of extracellular polymeric substance released by microorganisms with UV pretreatment was 76.50% of that without UV pretreatment. In addition, the transmembrane pressure only increased to 34.40 kPa after 60 d of operation for this process with UV pretreatment, while it significantly increased to 41.50 kPa without UV pretreatment. Due to broad sterilization and unsustainable characteristics of UV pretreatment, little variation of microbial community and abundance in the cake layer was observed between these two processes. Moreover, the effluent quality was little influenced by UV pretreatment.
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