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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 (H(2)S) from biogas, managing biogas H(2)S remains a significant challenge for agricultural digesters where labor and operational funds are very limited compared to municipal and...

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Detalles Bibliográficos
Autores principales: Mulbry, Walter, Selmer, Kaitlyn, Lansing, Stephanie
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Public Library of Science 2017
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5627928/
https://www.ncbi.nlm.nih.gov/pubmed/28976998
http://dx.doi.org/10.1371/journal.pone.0185738
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author Mulbry, Walter
Selmer, Kaitlyn
Lansing, Stephanie
author_facet Mulbry, Walter
Selmer, Kaitlyn
Lansing, Stephanie
author_sort Mulbry, Walter
collection PubMed
description Although there are a variety of commercially available biological and chemical treatments for removal of hydrogen sulfide (H(2)S) from biogas, managing biogas H(2)S 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 H(2)S levels in low cost plug flow digesters and to characterize the relationship between the liquid surface area and H(2)S oxidation rates. Experiments with replicate field scale plug flow digesters showed that H(2)S 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 H(2)S oxidation rates increased with increases in liquid surface area. These results support the hypothesis that H(2)S oxidation rates are limited, in part, by the surface area available for oxygen transfer, and can be increased by growth of biofilms containing H(2)S 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.
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spelling pubmed-56279282017-10-20 Effect of liquid surface area on hydrogen sulfide oxidation during micro-aeration in dairy manure digesters Mulbry, Walter Selmer, Kaitlyn Lansing, Stephanie PLoS One Research Article Although there are a variety of commercially available biological and chemical treatments for removal of hydrogen sulfide (H(2)S) from biogas, managing biogas H(2)S 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 H(2)S levels in low cost plug flow digesters and to characterize the relationship between the liquid surface area and H(2)S oxidation rates. Experiments with replicate field scale plug flow digesters showed that H(2)S 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 H(2)S oxidation rates increased with increases in liquid surface area. These results support the hypothesis that H(2)S oxidation rates are limited, in part, by the surface area available for oxygen transfer, and can be increased by growth of biofilms containing H(2)S 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. Public Library of Science 2017-10-04 /pmc/articles/PMC5627928/ /pubmed/28976998 http://dx.doi.org/10.1371/journal.pone.0185738 Text en https://creativecommons.org/publicdomain/zero/1.0/ This is an open access article, free of all copyright, and may be freely reproduced, distributed, transmitted, modified, built upon, or otherwise used by anyone for any lawful purpose. The work is made available under the Creative Commons CC0 (https://creativecommons.org/publicdomain/zero/1.0/) public domain dedication.
spellingShingle Research Article
Mulbry, Walter
Selmer, Kaitlyn
Lansing, Stephanie
Effect of liquid surface area on hydrogen sulfide oxidation during micro-aeration in dairy manure digesters
title Effect of liquid surface area on hydrogen sulfide oxidation during micro-aeration in dairy manure digesters
title_full Effect of liquid surface area on hydrogen sulfide oxidation during micro-aeration in dairy manure digesters
title_fullStr Effect of liquid surface area on hydrogen sulfide oxidation during micro-aeration in dairy manure digesters
title_full_unstemmed Effect of liquid surface area on hydrogen sulfide oxidation during micro-aeration in dairy manure digesters
title_short Effect of liquid surface area on hydrogen sulfide oxidation during micro-aeration in dairy manure digesters
title_sort effect of liquid surface area on hydrogen sulfide oxidation during micro-aeration in dairy manure digesters
topic Research Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5627928/
https://www.ncbi.nlm.nih.gov/pubmed/28976998
http://dx.doi.org/10.1371/journal.pone.0185738
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