Pilot Study on Vertical Anoxic-Oxic Submerged Membrane Bioreactor with Nylon Screen for Sewage Treatment

To decrease further the footprint of common anoxic-oxic submerged membrane bioreactor (A-O SMBR), a vertical structure on A-O SMBR was introduced in this paper. A nylon screen (NS) was placed in the oxic zone together with hollow fiber membrane (HF). With the reactor working, sludge flocs adsorbed on the NS surface and formed a "dynamic membrane" gradually, which could intercept pollutants in sewage. The results showed that the effluent quality of NS was similar to HF, but its cost and fouling were both less than HF. Therefore, in some condition, it could be considered that the screen instead of micro-filtration membrane was used in MBR.