Journal
BIORESOURCE TECHNOLOGY
Volume 130, Issue -, Pages 390-397Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2012.12.066
Keywords
Partial nitrification; Denitrification; Anammox; Fertilizer industry effluent; Single reactor
Funding
- University Grants Commission, New Delhi [37-375/2009(SR)]
- UGC- Emeritus fellowship
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A simultaneous partial nitrification, anammox and denitrification (SNAD) process was developed for the treatment of ammonia laden effluent of a fertilizer industry. Autotrophic aerobic and anaerobic ammonia oxidizing biomass was enriched and their ammonia removal ability was confirmed in synthetic effluent system. Seed consortium developed from these was applied in the treatment of effluent in an oxygen limited bench scale SNAD type (1L) reactor run at ambient temperature (similar to 30 degrees C). Around 98.9% ammonia removal was achieved with ammonia loading rate 035kgNH(4)(+)-N/m(3) day in the presence of 46.6 mg/L COD at 2.31 days hydraulic retention time. Qualitative and quantitative analysis of the biomass from upper and lower zone of the reactor revealed presence of autotrophic ammonia oxidizing bacteria (AOB), Planctomycetes and denitrifiers as the dominant bacteria carrying out anoxic oxidation of ammonia in the reactor. Physiological and molecular studies strongly indicate presence of anammox bacteria in the anoxic zone of the SNAD reactor. (C) 2012 Elsevier Ltd. All rights reserved.
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