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Please use this identifier to cite or link to this item: http://hdl.handle.net/10373/648

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Title: Effect of nitrate on methanogenesis at low redox potential
Authors: Akunna, Joseph C.
Bernet, N.
Moletta, R.
Affiliation: University of Abertay Dundee. School of Contemporary Sciences
Keywords: Anaerobic sludge
Denitrification
Methane
Nitrate
Redox potential
Issue Date: Dec-1998
Publisher: Taylor & Francis
Type: Journal Article
Refereed: peer-reviewed
Rights: Published version (c)Taylor & Francis, available from http://dx.doi.org/10.1080/09593331908616785
Citation: Akunna, J.C., Bernet, N. and Moletta, R. 1998. Effect of nitrate on methanogenesis at low redox potential. Environmental Technology. 19(12): pp.1249-1254. Available from: http://dx.doi.org/10.1080/09593331908616785
Abstract: Batch tests were used to study the contribution of redox potential to the inhibition of methanogenesis by nitrates. Using cultures containing cysteine solution which lowered the redox potential to about -300 mV, it was found that methane production started only after the total reduction of all oxides of nitrogen. However, it was observed that cysteine enhanced methanogenesis for cultures not containing nitrate. These cultures produced more methane than those without cysteine. Furthermore, cysteine was also found to enhance denitrification. Denitrification rates were 7 and 3.5 mg NO3-N gVSS-1 h-1 for cysteine and non cysteine-containing cultures respectively. This study shows that to have simultaneous denitrification and methanogenesis processes in a continuous single reactor would require a reactor system with zones of different nitrate concentrations, so that denitrifying and methanogenic populations could coexist and flourish.
URI: http://hdl.handle.net/10373/648
ISSN: 0959-3330
Appears in Collections:Science Engineering & Technology Collection

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