CR(VI) reduction by bio- and bioinorganic catalysts via use of biohydrogen: a sustainable approach to remediation of wastes

Humphries, A., Penfold, D.W. and Macaskie, L.E. (2007) CR(VI) reduction by bio- and bioinorganic catalysts via use of biohydrogen: a sustainable approach to remediation of wastes. Journal of Chemical Technology and Biotechnology, 82 (2). 182 - 189.

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Abstract

Use of biologically‐produced hydrogen (bio‐H2) as an electron donor for Cr(VI) reduction by native and palladized cells of Desulfovibrio vulgaris NCIMB 8303 was demonstrated. The bio‐H2 was produced fermentatively by Escherichia coli HD701 (a strain upregulated with respect to formate hydrogenlyase expression) using glucose solution or two industrial confectionery wastes as fermentable substrates. Maximum Cr(VI) reduction occurred at the expense of bio‐H2 using palladized biomass (bio‐Pd(0)), with negligible residual Cr(VI) remaining from a 0.5 mmol dm−3 solution after 2.5 h. Use of bio‐H2 as the electron donor for Cr(VI) reduction by agar‐immobilized bio‐Pd(0) in a continuous‐flow system gave 90% reduction efficiency at a flow residence time of 0.7 h, which was maintained for the duration of bio‐H2 evolution by E. coli HD701. This study shows the potential to remediate toxic metal waste at the expense of food processing waste, as a sustainable alternative to landfilling.

Item Type:	Article
Divisions:	Crop and Environment Sciences (to 31.07.20)
Depositing User:	Mr Darren Roberts
Date Deposited:	06 Nov 2018 21:54
Last Modified:	29 Nov 2018 14:14
URI:	https://hau.repository.guildhe.ac.uk/id/eprint/16377

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