Abstract
The partial nitrification-anammox (PN/A) process can remove nitrogen from wastewater by converting approximately half of the ammonium to nitrite by ammonium oxidizing bacteria (AOB), followed by converting the remaining ammonium and nitrite to N2 by anammox bacteria. Both the MBBR and IFAS processes can achieve the PN/A process in a single-stage reactor under appropriate operation. In this study, steady state simulation using SUMO™ was conducted to investigate the effects of key parameters (DO and COD/N ratio) on the PN/A process in both MBBR and IFAS. Results showed that MBBR and IFAS achieved about 90% total nitrogen removal by PN/A process with energy-efficient aeration and low COD/N ratios when treating domestic wastewater. IFAS achieved optimal nitrogen removal with lower DO concentration whereas MBBR showed better nitrogen removal at low COD/N ratio. Biomass concentration and process rates indicated that partial nitrification occurred throughout the biofilm of MBBR but mainly in the activated sludge of the IFAS.
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