Effective control of membrane fouling in MBR with flat-sheet ceramic membrane—Effect of particle size of activated carbon
Membrane bioreactor(MBR)was constructed for municipal wastewater treatment using flat-sheet ceramic membrane with high mechanical strength and excellent scrabbing resistance,and the roles of granular activated carbon(GAC)and powdered activated carbon(PAC)in membrane fouling control and pollutant removal were comparatively studied.The results showed that GAC exhibited a better fouling mitigation effect in the early stage of MBR operation due to its stronger scrabbing on membrane surface,and the growth rate of transmembrane pressure(TMP)decreased by 17％,but the fouling mitigation effect of GAC was not obvious in the middle and later operation stages.In comparison,PAC displayed a significant advantage in membrane fouling control during the middle and later operation stages,the TMP growth rate decreased by 28％.Mechanism analyses showed that the extracellular polymeric substances(EPS)content in the mixed liquor of PAC-MBR was decreased by 49％,while the average size of activated sludge flocs increased by 102 pm.Moreover,the addition of PAC in MBR increased the total nitrogen(TN)removal by 17％,the removal rate of COD also increased.The results of this study provide a technical support for the effective membrane fouling control and efficient operation of MBR with flat-sheet ceramic membranes.
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