Abstract
A combination of cell immobilization and membrane aeration approaches was used in a biological reactor to treat NH4+ in wastewater. Nitrifying microorganisms, immobilized by polyvinyl-alcohol (PVA) and attached to the surface of a silicone membrane tube, were used to develop a novel reactor for nitrification. The immobilized biofilm had a rubber-like elasticity and resisted shear stress over 5 months of operation. The reactor removed 95% of ammonium, added at 1.97 g N m−2 d−1, with O−2 enriching the membrane.
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