Application of CANON process for nitrogen removal from anaerobically pretreated husbandry wastewater

In this study, the removal of nitrogen from anaerobically pretreated husbandry wastewater using a continuous stirred tank reactor of a completely autotrophic nitrogen removal over nitrite (CANON) process coupled with a simple aeration setup was investigated. The reactor was operated with anaerobical...

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Bibliographic Details
Published in:	International biodeterioration & biodegradation 2019-01, Vol.136, p.15-23
Main Authors:	Huynh, Tuong Vy, Nguyen, Phuoc Dan, Phan, The Nhat, Luong, Duy Ha, Truong, Thi Thanh Van, Huynh, Khanh An, Furukawa, Kenji
Format:	Article
Language:	eng
Subjects:	Aeration Alkalinity Ammonia Anaerobic processes Anaerobically pretreated husbandry wastewater Anammox AOB CANON Chemical oxygen demand Continuously stirred tank reactors Dissolved oxygen Heterotrophs Husbandry Hydraulics Nitrogen Nitrogen removal Organic chemistry Oxidation Reactors Wastewater Wastewater treatment Water treatment
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Summary:	In this study, the removal of nitrogen from anaerobically pretreated husbandry wastewater using a continuous stirred tank reactor of a completely autotrophic nitrogen removal over nitrite (CANON) process coupled with a simple aeration setup was investigated. The reactor was operated with anaerobically pretreated husbandry wastewater at hydraulic retention times (HRTs) of 16, 8, and 6 h with stepwise increased in average nitrogen loading rates (NLRs) of 0.47, 0.95, and 1.16 kg N m−3 d−1. The highest and stable nitrogen removal was obtained at HRT of 8 h (NLR of 0.95 kg N m−3 d−1). The key operating conditions were intermittent aeration for maintaining low dissolved oxygen concentrations (0.1–0.2 mg l−1) and alkalinity adjustment for obtaining pH values of 7.6–7.8. The effluent quality met Vietnamese husbandry wastewater standard for total nitrogen (400 mg l−1) in the feed wastewater reduced ammonia oxidizing bacteria (AOB) activity. At shorter HRT (6 h), the washout of fine bioflocs containing aerobic heterotrophs and AOB occurred, while the reddish anammox granules still remained in the reactor. [Display omitted] •A completely autotrophic nitrogen removal over nitrite (CANON) process was efficiently applied for nitrogen removal from anaerobically pretreated husbandry wastewater.•Anammox bacteria fully grew from the seed anaerobic heterotrophic granules.•Stratification of ammonia-oxidizing bacteria (AOB) in bioflocs and anammox bacteria in granules occurred in a continuous stirred tank reactor (CSTR).
ISSN:	0964-8305 1879-0208