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Pilot-Scale MBR and RO Process for COD, Nitrogen and Phosphorus Removals of Mixed Domestic – Industrial Wastewater at 30°C in Singapore

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A pilot-scale modified University of Cape Town (UCT) activated sludge – membrane reactor (MBR) followed by a RO unit was adopted to study treatment and reuse of the mixed domestic-industrial wastewater at Jurong Water Reclamation Plant (WRP) in Singapore. Nutrient removal especially enhanced biological phosphorus removal (EBPR) in warm climate, which is a relatively unexplored topic, is one of the main focuses. Detailed investigation on the process performance and mass balance of the whole process and individual reactors were conducted. The COD removal efficiency was high and nitrification was almost completed. However, EBPR was poor as little COD was being taken up by phosphorus accumulating organism (PAO) while a substantial amount was taken up by glycogen accumulating organism (GAO) in the anaerobic reactor indicating an overwhelming dominance of GAO. COD, NH4 +-N, NO3 -N and PO4 3−-P concentration differences cross the membrane were found and possible reasons were discussed. The feasibility to reuse both the MBR permeate and RO product were suggested accordingly.
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Keywords: Wastewater treatment and reuse; membrane bioreactor; nutrient removal; reverse osmosis

Document Type: Research Article

Publication date: 2011-01-01

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