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Control of Partial Nitritation of Centrate in a Sequencing Batch Reactor
Author(s) -
Miot Alexandre,
Pagilla Krishna R.
Publication year - 2010
Publication title -
water environment research
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.356
H-Index - 73
eISSN - 1554-7531
pISSN - 1061-4303
DOI - 10.2175/106143010x12609736967044
Subject(s) - sequencing batch reactor , environmental science , waste management , chemistry , environmental engineering , sewage treatment , engineering
This research identified suitable conditions for long‐term inhibition of nitrite‐oxidizer bacteria (NOB) in a sequencing batch reactor for the treatment of centrate by over‐nitrite pathways. The NOB were inhibited by free ammonia concentrations greater than 20 mg NH 3 ‐N/L combined with a dissolved oxygen concentration less than 0.3 mg O 2 /L and a temperature of 30°C. The experiments were performed in a laboratory‐scale 2.5‐L reactor fed with synthetic and actual centrate from a full‐scale wastewater treatment plant (800 to 1500 mg NH 4 + ‐N/L). The influence of influent‐alkalinity‐to‐ammonium ratio (AAR) on the effluent‐nitrite‐to‐ammonium ratio (NAR) also was investigated. The control of the effluent NAR was possible by adjusting the influent AAR when NOB inhibition was maintained and when total alkalinity depletion took place before the end of the cycle. The maximum nitritation rate of 860 mg NO 2 − ‐N oxidized/L·d was obtained when the influent NH 4 + ‐N concentration was 800 mg NH 4 + ‐N/L and the hydraulic retention time was 1.7 days.