Abstract
In this study, powdered activated carbon (PAC) was used to improve the operational performance of ultra-filtration (UF) membrane bioreactor (MBR) system. At first, two runs of tests were carried out to investigate the effect of MLSS and SCOD in MBR on UF membrane permeate flux. It was found that the majority of the increasing resistance was attributed to cake resistance, while in the reactor with higher COD, the fouling resistance increased at a rate higher than the cake resistance did. On this base, a model of protection layer was proposed to illustrate the phenomenon of UF membrane fouling. Following that, PAC was added into the test reactor to enhance the formation of protection layer. During the operational period of 32 days, compared with the control system, test system obtained higher removals for COD, NH4+-N, TN and TP by 7.5%, 6.8%, 5.5% and 12.6%, respectively. And fouling rate of the UF membrane in it was also lowered.
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