title: Short-term temperature impact on simultaneous biological nitrogen-sulphur treatment in EGSB reactor.
abstract: 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.
authors.affiliation: University College of Southeast Norway, Kjølnes Ring 56, Porsgrunn 3918, Norway E-mail: michal.sposob@hit.no.
authors.forename: Michal
authors.initials: M
authors.lastname: Sposob
authors.affiliation: University College of Southeast Norway, Kjølnes Ring 56, Porsgrunn 3918, Norway E-mail: michal.sposob@hit.no.
authors.forename: Carlos
authors.initials: C
authors.lastname: Dinamarca
authors.affiliation: University College of Southeast Norway, Kjølnes Ring 56, Porsgrunn 3918, Norway E-mail: michal.sposob@hit.no.
authors.forename: Rune
authors.initials: R
authors.lastname: Bakke
mesh_terms: D019149:Bioreactors; D009584:Nitrogen / Q000737:chemistry*; D012722:Sewage / Q000737:chemistry*; D013455:Sulfur / Q000737:chemistry*; D013696:Temperature; D013997:Time Factors; D014865:Waste Disposal, Fluid / Q000379:methods; D014874:Water Pollutants, Chemical / Q000737:chemistry*
chemical_list: D012722:Sewage; D014874:Water Pollutants, Chemical; D013455:Sulfur; D009584:Nitrogen