This study used UV/O-aMBR system for treating polluted surface water with COD around 10 mg/L, to improve the removal of non-biodegradable components. UV/O was used in the recirculation stream, partially treating the recalcitrant in aMBR permeate to improve its biodegradability, and then send back to aMBR for biodegradation. Removal performance of UV/O-aMBR system with recirculation ratio 20, 40, 60 and 80% was tested and compared. The removal of COD, UV and NH-N increased with the increment of recirculation ratio. UV/O-aMBR system has higher recalcitrant removal performance and less membrane fouling. The fluorescent dissolved organic matter (FDOM) was largely reduced in UV/O-aMBR system, and the system hydrophilicity was higher than aMBR system. The Modified Stover Kincanoon model was able to describe UV/O-aMBR system; and has higher Umax than aMBR system. UV/O-aMBR can be develop as an effective technology in improving recalcitrant removal in polluted surface water treatment.
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