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Please use this identifier to cite or link to this item: http://hdl.handle.net/10204/4504

Title: Relationships between sulphate reduction and COD/VFA utilisation using grass cellulose as carbon and energy sources
Authors: Mulopo, J
Greben, H
Sigama, J
Radebe, V
Mashego, M
Burke, L
Keywords: Biological sulphate removal
Batch reactors
COD/VFA production
Rumen microorganisms
Sulphate reducing bacteria
Issue Date: Jul-2010
Publisher: Humana Press (Springer Imprint)
Citation: Mulopo, J, Greben, H, Sigama, J et al. 2010. Relationships between sulphate reduction and COD/VFA utilisation using grass cellulose as carbon and energy sources. Applied Biochemistry and Biotechnology, Vol. 162, pp 1-11
Series/Report no.: Journal Article
Abstract: The release of mine effluents can have a damaging impact on receiving water bodies. Therefore, treatment of mine waters before discharge is imperative. A novel biological SO2/4 removal technology has been developed whereby the degradation/fermentation products of grass cellulose, volatile fatty acids (VFA), function as the electron donors and SO2/4 as the electron acceptor. The aim of the study presented here was to elucidate the interactions between the cellulose degradation rate, the chemical oxygen demand (COD), VFA production and its/utilisation rate as well as the sulphate reduction rate. To this end, two stirred batch reactors were operated: a test and a control reactor. The results showed that high COD and VFA concentrations were achieved after cellulose degradation, which resulted in a rapid decrease in the SO2/4 concentration in the test reactor. The VFA results indicated that propionic and butyric acids were preferentially utilised, producing acetate. In the control reactor, the VFA and the COD production increased initially at the same rate, followed later by a decrease at a similar rate. These results suggest that the degradation products formed were utilised by the methanogenic bacteria to produce methane rather than by the sulphate-reducing bacteria, since the control reactor contained no sulphate (Visser 1995). Furthermore, these results showed a clear relationship between the COD/VFA production and the SO2/4 reduction in the test reactor and between the COD and VFA pattern in the control reactor.
Description: Copyright: 2010 Human Press (Springer). This is a post print version of the work. The definitive version is published in Applied Biochemistry and Biotechnology, Vol. 162
URI: http://www.springerlink.com/content/r738v5p143662882/fulltext.pdf
ISSN: 0273-2289
Appears in Collections:Pollution and waste
General science, engineering & technology

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