Journal
WATER SCIENCE AND TECHNOLOGY
Volume 66, Issue 10, Pages 2258-2264Publisher
IWA PUBLISHING
DOI: 10.2166/wst.2012.457
Keywords
anaerobic digestion; biogas desulfurization; headspace; hydrogen sulfide removal; microaerobic conditions
Funding
- Counseling of Education of the Junta de Castilla y Leon
- European Social Fund
- CONSOLIDER-INGENIO of the Spanish Ministry of Education and Science
- [CSD2007-00055]
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The role of the headspace (HS) in the microaerobic removal of hydrogen sulfide from biogas produced during sludge digestion was studied. Research was carried out in a pilot reactor with a total volume of 265 L, under mesophilic conditions. Biogas was successfully desulfurized (99%) by introducing pure oxygen (0.46 NL/L-fed) into the recirculation stream when the HS volume was both 50.0 and 9.5 L. The removal efficacy dropped sharply to approximate to 15% when the HS was reduced to 1.5 L. The system responded quickly to the operational changes imposed: micro-oxygenation stops and variations in supply, as well as HS volume reductions and increases. As the final result, the microaerobic process required a minimum surface into the gas space to occur, which along with the elemental sulfur deposition in this area indicated that the oxidation took place there. Additionally, the pattern of sulfur accumulation suggested that the removal occurred preferentially on certain materials, and pointed to a significant biological contribution.
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