Effect of liquid surface area on hydrogen sulfide oxidation during micro-aeration in dairy manure digesters
Although there are a variety of commercially available biological and chemical treatments for removal of hydrogen sulfide (H2S) from biogas, managing biogas H2S remains a significant challenge for agricultural digesters where labor and operational funds are very limited compared to municipal and ind...
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| Veröffentlicht in: | PloS one 2017-10, Vol.12 (10), p.e0185738-e0185738 |
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| description | Although there are a variety of commercially available biological and chemical treatments for removal of hydrogen sulfide (H2S) from biogas, managing biogas H2S remains a significant challenge for agricultural digesters where labor and operational funds are very limited compared to municipal and industrial digesters. The objectives of this study were to evaluate headspace aeration for reducing H2S levels in low cost plug flow digesters and to characterize the relationship between the liquid surface area and H2S oxidation rates. Experiments with replicate field scale plug flow digesters showed that H2S levels decreased from 3500 ppmv to |
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The objectives of this study were to evaluate headspace aeration for reducing H2S levels in low cost plug flow digesters and to characterize the relationship between the liquid surface area and H2S oxidation rates. Experiments with replicate field scale plug flow digesters showed that H2S levels decreased from 3500 ppmv to <100 ppmv when headspace oxygen levels were 0.5 to 1%. Methane production was not affected by aeration rates that resulted in headspace oxygen levels of up to 1%. Pilot scale experiments using 65 to 104 L desulfurization units showed that H2S oxidation rates increased with increases in liquid surface area. These results support the hypothesis that H2S oxidation rates are limited, in part, by the surface area available for oxygen transfer, and can be increased by growth of biofilms containing H2S oxidizing bacteria. 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The objectives of this study were to evaluate headspace aeration for reducing H2S levels in low cost plug flow digesters and to characterize the relationship between the liquid surface area and H2S oxidation rates. Experiments with replicate field scale plug flow digesters showed that H2S levels decreased from 3500 ppmv to <100 ppmv when headspace oxygen levels were 0.5 to 1%. Methane production was not affected by aeration rates that resulted in headspace oxygen levels of up to 1%. Pilot scale experiments using 65 to 104 L desulfurization units showed that H2S oxidation rates increased with increases in liquid surface area. These results support the hypothesis that H2S oxidation rates are limited, in part, by the surface area available for oxygen transfer, and can be increased by growth of biofilms containing H2S oxidizing bacteria. 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The objectives of this study were to evaluate headspace aeration for reducing H2S levels in low cost plug flow digesters and to characterize the relationship between the liquid surface area and H2S oxidation rates. Experiments with replicate field scale plug flow digesters showed that H2S levels decreased from 3500 ppmv to <100 ppmv when headspace oxygen levels were 0.5 to 1%. Methane production was not affected by aeration rates that resulted in headspace oxygen levels of up to 1%. Pilot scale experiments using 65 to 104 L desulfurization units showed that H2S oxidation rates increased with increases in liquid surface area. These results support the hypothesis that H2S oxidation rates are limited, in part, by the surface area available for oxygen transfer, and can be increased by growth of biofilms containing H2S oxidizing bacteria. Maximum removal rates corresponded to 40 to 100 g S m-2 d-1 of liquid surface area at biogas retention times of 30 to 40 min.</abstract><cop>United States</cop><pub>Public Library of Science</pub><pmid>28976998</pmid><doi>10.1371/journal.pone.0185738</doi><orcidid>https://orcid.org/0000-0001-8129-6736</orcidid><oa>free_for_read</oa></addata></record> |
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| subjects | Aeration Agricultural management Agriculture Animal wastes Bacteria biofilm Biofilms Biogas Bioreactors Chemical treatment dairy manure Dairying desulfurization Digesters Earth Sciences Ecology and Environmental Sciences Engineering and Technology Headspace headspace analysis Hydrogen Hydrogen ion concentration Hydrogen sulfide Hydrogen Sulfide - chemistry labor liquids Low cost Manure Manures Methane - metabolism Methane production microbial growth Oxidation Oxidation-Reduction Oxygen Oxygen transfer Physical Sciences Pilot Projects Plug flow Refuse as fuel Scale (corrosion) Sulfide Sulfides Surface area |
| title | Effect of liquid surface area on hydrogen sulfide oxidation during micro-aeration in dairy manure digesters |
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