Abstract
A chemo-biological approach for treating sulphate-rich effluent generated during wet scrubbing of flue gas emissions from fossil fuel fired power plants has been discussed. Microbial sulphate reduction was carried out in an anaerobic up-flow packed bed bioreactor (R1) using ethanol as carbon source. More than 90% of Total Equivalent Sulphate (TES) present in the effluent was reduced to sulphide at HRT of 17 h in the tested loading range of 0.58?3.10 kg SO4/m³/day. Mass balance revealed that more than 88% of sulphate reduced was present as dissolved sulphide (HS−) and while only 0.01% was present as H2S(g). The paper discusses the feasibility of converting both H2S(g) and HS− into value-added products such as elemental sulphur and metal sulphide nanoparticles, respectively. Since the amount of H2S generated is very low (0.01%), this paper also suggests recovery of dissolved sulphide from the R1 effluent, as transition metal sulphide nanoparticles.
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