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Short-term temperature impact on simultaneous biological nitrogen-sulphur treatment in EGSB reactor.
Water Science and Technology : a Journal of the International Association on Water Pollution Research 2016 October
Sulphides are present in many wastewater streams; their removal is important due to corrosiveness, toxicity and unpleasant odour, and can be carried out by anaerobic biological treatment. This study focuses on the temperature effect (25-10 °C) on an expanded granular sludge bed (EGSB) reactor for sulphide removal using nitrate as electron acceptor. The reactor was run at a NO3(-)/HS(-) molar ratio of 0.35 and pH of 8.5-9.0. Samples were analysed by ion chromatography (NO3(-), SO4(2-) and S2O3(2-)), spectrophotometry (S(2-)) and by scanning electron microscopy (SEM). S(2-) and NO3(-) removal was 99.74 ± 0.04 and 99.5 ± 2.9%, respectively. Sulphur (S(0)) was found on the outer granule surface and struvite inside the granule, by SEM. Sulphide conversion to sulphur was up to 76%. Temperature transitions and levels influenced S2O3(2-) and SO4(2-) concentrations.
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