A potential remediation technique for groundwater contaminated by bromate has been investigated, utilising biological bromate reduction to bromide by augmentation of indigenous microbial populations. This technique, involving addition of a carbon source to contaminated groundwater, is being developed as an ex-situ methodology analogous to commercial denitrification systems, but may also havein-situ applications. Trials have focussed on a laboratory-scale anaerobic suspended growth chemostat system, investigating glucose addition to real groundwater supplies. Steady states for a range of glucose and bromate concentrations demonstrated bromate reduction up to 700μgl−1 (50% of 1400μgl−1 influent) with glucose excess (above 52mgl−1), but specific reduction rates (up to 2.83μmol Br.g dry wt−1hr−1 for 1400μgl−1 bromate influent) were low compared to denitrification (up to 305μmol Ng dry wt−1hr−1). More recent enrichment trials have demonstrated reduction of 32mgl−1 bromate within a 40 hour residence time with specific reduction rates of up to 160.48μmol Br.g dry wt−1hr−1, suggesting the presence of high rate bromate reducing bacterial strains.
Reduction of bromate in groundwater with an ex situ suspended growth bioreactor
R. Butler, A.R. Godley, R. Lake, L. Lytton, E. Cartmell; Reduction of bromate in groundwater with an ex situ suspended growth bioreactor. Water Sci Technol 1 November 2005; 52 (9): 265–273. doi: https://doi.org/10.2166/wst.2005.0334
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