Treatment of campus wastewater by hybrid membrane bioreactor

Hybrid membrane bioreactor (HMBR), which was developed by adding biofilm carriers into conventional membrane bioreactor, was investigated for simultaneously removing organic carbon and nitrogen in campus wastewater. This study showed that HMBR was able to obtain high pollution removal efficiency, with COD and NH₄⁺-N removal efficiency averaged at 88% and 97.5%, respectively, during the experimental period. The activity of activated sludge predicted by specific oxygen utilization rate (SOUR), decreased gradually with time from 80 mg/(kg·min) to 30 mg/(kg·min). During the study it came to the fluctuation of organic loading rate (OLR) and nitrogen loading rate (NLR), and the result indicated that low loading rate had some effects on sludge supernatant turbidity (ST) and membrane fouling.