Journal
BIORESOURCE TECHNOLOGY
Volume 219, Issue -, Pages 411-419Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2016.07.114
Keywords
Partial nitritation; Anammox; Denitrification; Fermentation; Biological nitrogen removal
Funding
- Natural Science Foundation of China [51478013]
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This study presents a novel process (i.e. PN/SFDA) to remove nitrogen from low C/N domestic wastewater. The process mainly involves two reactors, a pre-Sequencing Batch Reactor for partial nitritation (termed as PN-SBR) and an anoxic reactor for integrated Denitrification and Anammox with carbon sources produced from Sludge Fermentation (termed as SFDA). During long-term Runs, NO2/NH4+ ratio (i.e. NO2-N/NH4+-N calculated by mole) in the PN-SBR effluent was gradually increased from 0.2 to 37 by extending aerobic duration, meaning that partial nitritation turning to full nitritation could be achieved. Impact of partial nitritation degree on SFDA process was investigated and the result showed that, NO2/NH4+ ratios between 2 and 10 were appropriate for the co-existence of denitrification and anammox together in the SFDA reactor, and denitrification instead of anammox contributed greater for nitrogen removal. Further batch tests indicated that anammox collaborated well with denitrification at low C/N (1.0 in this study). (C) 2016 Elsevier Ltd. All rights reserved.
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