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Short-term temperature impact on simultaneous biological nitrogen-sulphur treatment in EGSB reactor
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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−, SO42− and S2O32−), spectrophotometry (S2−) and by scanning electron microscopy (SEM). S2− and NO3− removal was 99.74 ± 0.04 and 99.5 ± 2.9%, respectively. Sulphur (S0) 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 S2O32− and SO42− concentrations.
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