Journal
BIORESOURCE TECHNOLOGY
Volume 102, Issue 4, Pages 3768-3775Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2010.12.016
Keywords
Biogas; Sulphide; Microaerobic; Sulphide-oxidising bacteria; Sludge digestion
Funding
- CONSOLIDER-INGENIO [CSD2007-00055]
- Spanish Ministry of Education and Science
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Limited oxygen supply to anaerobic sludge digesters to remove hydrogen sulphide from biogas was studied. Micro-oxygenation showed competitive performance to reduce considerably the additional equipment necessary to perform biogas desulphurization. Two pilot-plant digesters with an HRT of similar to 20 d were micro-oxygenated at a rate of 0.25 NL per L of feed sludge with a removal efficiency higher than 98%. The way of mixing (sludge or biogas recirculation) and the point of oxygen supply (headspace or liquid phase) played an important role on hydrogen sulphide oxidation. While micro-oxygenation with sludge recirculation removed only hydrogen sulphide from the biogas, dissolved sulphide was removed if micro-oxygenation was performed with biogas recirculation. Dosage in the headspace resulted in a more stable operation. The result of the hydrogen sulphide oxidation was mostly elemental sulphur, partially accumulated in the headspace of the digester, where different sulphide-oxidising bacteria were found. (C) 2010 Elsevier Ltd. All rights reserved.
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