Impact of partial nitritation degree and C/N ratio on simultaneous Sludge Fermentation, Denitrification and Anammox process

[Display omitted] •A simultaneous nitrogen removal and sludge reutilization process was verified effective.•Enhanced nitrogen removal was achieved in treating low C/N domestic wastewater.•Strong acceptance for wide NO2−/NH4+ ranges was demonstrated feasible for SFDA.•Denitrification and anammox join...

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Bibliographic Details
Published in:Bioresource technology 2016-11, Vol.219, p.411-419
Main Authors: Wang, Bo, Peng, Yongzhen, Guo, Yuanyuan, Yuan, Yue, Zhao, Mengyue, Wang, Shuying
Format: Article
Language:English
Subjects:
Ammonia - chemistry
Ammonia - metabolism
Anammox
Biological nitrogen removal
Bioreactors
Carbon - analysis
Carbon - chemistry
Carbon - metabolism
Denitrification
Fermentation
Nitrogen - analysis
Nitrogen - chemistry
Nitrogen - metabolism
Partial nitritation
Sewage - chemistry
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Summary:[Display omitted] •A simultaneous nitrogen removal and sludge reutilization process was verified effective.•Enhanced nitrogen removal was achieved in treating low C/N domestic wastewater.•Strong acceptance for wide NO2−/NH4+ ranges was demonstrated feasible for SFDA.•Denitrification and anammox jointly contribute to N removal with C/N of 1.0 or lower. 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).
ISSN:0960-8524
1873-2976
DOI:10.1016/j.biortech.2016.07.114