Mitigation of membrane biofouling in membrane bioreactor treating sewage by novel quorum quenching strain of Acinetobacter originating from a full-scale membrane bioreactor

A novel quorum quenching (QQ) strain, Acinetobacter guillouiae ST01, was isolated from a full-scale membrane bioreactor (MBR) and characterized for its QQ activities. Batch reactor studies at lab-scale showed that A. ST01 exhibited higher activity against acyl homoserine lactones (AHLs) with an oxo group compared to those without group. The organism then inoculated (10%) in MBR (Q-MBR) treating sewage over 48 days found reduce sensing (QS) by reducing AHL concentrations the sludge biofilm of Q-MBR. concentration polysaccharides reduced up 30% both relative control, whereas protein were 40% 47% biofilm, respectively. Q-MBR fouling rates halved. These results indicate is promising strain biofouling reduction real wastewater.