Interaction of denitrification and P removal in anoxic P removal systems

Abstract This paper compares municipal wastewater (MWW) as a carbon source with other volatile fatty acids (VFAs) such as acetic acid, propionic acid and butyric acid in biological nutrient removal (BNR) processes. Biomass specific denitrification rates (SDNR) using acetic acid, butyric acid, propionic acid, MWW and primary effluent from batch studies were 107.2, 77.1, 37.9, 31.1 and 30.0 mg NO3–N/g VSS·d respectively. SDNR for acetic acid derived from batch experiments and respirometric studies were identical while for the MWW the discrepancy between the two methods was about 31%. Phosphorus (P) release was observed only after nitrate concentration dropped to

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