4.8 Article

Sulfide removal by moderate oxygenation of anaerobic sludge environments

期刊

BIORESOURCE TECHNOLOGY
卷 98, 期 3, 页码 518-524

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ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2006.02.011

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sulfide oxidation; micro-aerobic conditions; anaerobic sludge

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Introduction of a limited amount of oxygen to anaerobic bioreactors is proposed as a simple technique to lower the level of sulfide in the biogas. This paper presents the results of a bioreactor study and of batch experiments that were performed to obtain better insight into the fate of sulfur compounds and oxygen during micro-aerobic sulfide oxidation. Introduction of a low airflow (0.7-0.9 m(3) m-3 d(-1), corresponding to an O-2/S molar ratio of 8-10) to a fluidized bed reactor fed with low-sulfate vinasse was sufficient to reduce the biogas H2S-content to an undetectable level. Sulfide was initially oxidized to elemental sulfur, thiosulfate and - most probably - polysulfide. Significant sulfate production did not occur. Bioreactor sludge sampled from the reactor after three weeks' micro-aerobic operation was much faster in oxidizing sulfur than bioreactor sludge sampled during fully anaerobic reactor operation. The reaction proceeded faster with increasing O-2/sulfide ratios. (c) 2006 Elsevier Ltd. All rights reserved.

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