Effects of operational parameters on the treatment of nitrate-rich wastewater by autohydrogenotrophic denitrifying bacteria

Mousavi, S. and Ibrahim, S. and Aroua, M.K. (2013) Effects of operational parameters on the treatment of nitrate-rich wastewater by autohydrogenotrophic denitrifying bacteria. Water and Environment Journal. pp. 1-10. ISSN 17476585, DOI https://doi.org/10.1111/wej.12076.

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Abstract

The effects of the C/N ratio, as well as hydrogen gas and substrate concentrations, on the treatment of nitrate-rich wastewater by autohydrogenotrophic denitrifying bacteria in sequencing batch reactors were investigated. Among the various C/N ratios applied in this study, a C/N ratio of 4 was found to be the most suitable ratio that resulted in faster growth and adaptation. The denitrification rate improved with less accumulation of nitrite with increasing H2 sparging time. Moreover, an increase in nitrate concentration resulted in high nitrite accumulation. The nitrite accumulated to 601mg/L NO2-N when the nitrate concentration was 1000mg/L NO3 —N. The specific degradation rates for nitrate and nitrite were found to be 27.8mg NO3 —N/g MLVSS/d and 50mg NO2 —N/g MLVSS/d, respectively, when the C/N ratio was 2, and H2 as electron donor was sparged for 1min with 2h interval. © 2013 CIWEM.

Item Type:	Article
Funders:	UNSPECIFIED
Additional Information:	Export Date: 13 February 2014 Source: Scopus Article in Press Language of Original Document: English Correspondence Address: Mousavi, S.; Department of Environmental Health, Kermanshah University of Medical Sciences, Kermanshah 6715777157email: seyyedarm@yahoo.com
Uncontrolled Keywords:	Autohydrogenotrophic bacteria, C/N ratio, Denitrification, Sequencing batch reactor, Wastewater
Subjects:	T Technology > T Technology (General) T Technology > TA Engineering (General). Civil engineering (General)
Divisions:	Faculty of Engineering
Depositing User:	Mr Jenal S
Date Deposited:	02 Apr 2014 01:44
Last Modified:	03 Jul 2017 08:18
URI:	http://eprints.um.edu.my/id/eprint/9422

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