Abstract
A laboratory scale hollow fibre membrane bioreactor which used bubbleless membrane aeration was tested over 5 months for its ability to treat synthetic sewage. A biofilm was grown on the surface of 280 μ diameter, gas permeable, sealed-end, polypropylene based fibres. The fibre lumens were pressurized with pure oxygen and synthetic sewage was pumped over the surface of the biofilm. At the highest volumetric COD (chemical oxygen demand) loading of 8.94 kg/m 3/d and a hydraulic retention time (HRT) of 36 min, 86% COD removal was achieved. A daily backwash was necessary to prevent channelling. The oxygen transfer efficiency was 100%.
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