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Simultaneous Nitrification-Denitrification and Phosphorous Removal (SNDPR) in Continuously Fed and Aerated Membrane Bioreactor

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Conventional membrane bioreactors (MBR) used in municipal wastewater treatment require additional processes to remove nutrients. Previous researches have proposed low dissolved oxygen (DO) concentration or intermittent aeration in order to provide two or more of the different environmental conditions in a tank for nitrogen or simultaneous nitrogen and phosphorous removal. This paper will, for the first time, demonstrate the achievability of simultaneous nitrogen and phosphorous removal without cycling of air and/or feed in MBR system for the treatment of a synthetic medium strength municipal wastewater. This was achieved through operating under low dissolved oxygen (DO) and a high biomass concentration. More than 98% of influent COD was removed. Total nitrogen removal was 55%, out of which 75% was through simultaneous nitrification-denitrification (SND) and 25% through assimilation into the biomass. Surprisingly, more than 98% phosphorous was removed and microbiological analysis showed the presence of PAOs in the activated sludge. The operating MLSS was between 16-23 g/L. The optimum DO found to be 0.7-0.8 mg/L.
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Document Type: Research Article

Publication date: 01 January 2004

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