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Sulfate-reducing bioreactors subjected to high sulfate loading rate or acidity: variations in microbial consortia

Sulfate-reducing bioreactors are used in e.g. the mining industry to remove sulfate and harmful metals from process waters. These bioreactors are expected to be run for extended periods of time and may experience variations in the influent quality, such as increasing sulfate loading rate and decreas...

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Autores principales: Salo, Marja, Bomberg, Malin
Formato: Online Artículo Texto
Lenguaje:English
Publicado: Springer Berlin Heidelberg 2022
Materias:
Acceso en línea:https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9288570/
https://www.ncbi.nlm.nih.gov/pubmed/35841424
http://dx.doi.org/10.1186/s13568-022-01438-2
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author Salo, Marja
Bomberg, Malin
author_facet Salo, Marja
Bomberg, Malin
author_sort Salo, Marja
collection PubMed
description Sulfate-reducing bioreactors are used in e.g. the mining industry to remove sulfate and harmful metals from process waters. These bioreactors are expected to be run for extended periods of time and may experience variations in the influent quality, such as increasing sulfate loading rate and decrease in pH, while being expected to function optimally. In this study we followed the sulfate removal rate and variation in microbial communities over a period of up to 333 days in three different up-flow anaerobic sludge blanket (UASB) bioreactors being submitted to increasing sulfate loading rate or decreasing pH. Sodium lactate was used as the sole carbon source and electron donor. All three bioreactors contained highly diverse microbial communities containing archaea, fungi and bacteria. Sulfurospirillum and Desulfovibrio were the most prominent bacterial genera detected in the bioreactors receiving the highest sulfate loading rates, and the greatest relative abundance of methanogenic archaea and the fungal genus Cadophora coincided with the highest sulfate reduction rates. In contrast, Sulfuricurvum was dominant in the bioreactor receiving influent with alternating pH, but its relative abundance receded in response to low pH of the influent. All bioreactors showed excellent sulfate removal even under extreme conditions in addition to unique responses in the microbial communities under changing operational conditions. This shows that a high diversity in the microbial consortia in the bioreactors could make the sulfate removal process less sensitive to changing operational conditions, such as variations in influent sulfate loading rate and pH. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s13568-022-01438-2.
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spelling pubmed-92885702022-07-18 Sulfate-reducing bioreactors subjected to high sulfate loading rate or acidity: variations in microbial consortia Salo, Marja Bomberg, Malin AMB Express Original Article Sulfate-reducing bioreactors are used in e.g. the mining industry to remove sulfate and harmful metals from process waters. These bioreactors are expected to be run for extended periods of time and may experience variations in the influent quality, such as increasing sulfate loading rate and decrease in pH, while being expected to function optimally. In this study we followed the sulfate removal rate and variation in microbial communities over a period of up to 333 days in three different up-flow anaerobic sludge blanket (UASB) bioreactors being submitted to increasing sulfate loading rate or decreasing pH. Sodium lactate was used as the sole carbon source and electron donor. All three bioreactors contained highly diverse microbial communities containing archaea, fungi and bacteria. Sulfurospirillum and Desulfovibrio were the most prominent bacterial genera detected in the bioreactors receiving the highest sulfate loading rates, and the greatest relative abundance of methanogenic archaea and the fungal genus Cadophora coincided with the highest sulfate reduction rates. In contrast, Sulfuricurvum was dominant in the bioreactor receiving influent with alternating pH, but its relative abundance receded in response to low pH of the influent. All bioreactors showed excellent sulfate removal even under extreme conditions in addition to unique responses in the microbial communities under changing operational conditions. This shows that a high diversity in the microbial consortia in the bioreactors could make the sulfate removal process less sensitive to changing operational conditions, such as variations in influent sulfate loading rate and pH. SUPPLEMENTARY INFORMATION: The online version contains supplementary material available at 10.1186/s13568-022-01438-2. Springer Berlin Heidelberg 2022-07-16 /pmc/articles/PMC9288570/ /pubmed/35841424 http://dx.doi.org/10.1186/s13568-022-01438-2 Text en © The Author(s) 2022 https://creativecommons.org/licenses/by/4.0/Open AccessThis article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons licence, and indicate if changes were made. The images or other third party material in this article are included in the article's Creative Commons licence, unless indicated otherwise in a credit line to the material. If material is not included in the article's Creative Commons licence and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this licence, visit http://creativecommons.org/licenses/by/4.0/ (https://creativecommons.org/licenses/by/4.0/) .
spellingShingle Original Article
Salo, Marja
Bomberg, Malin
Sulfate-reducing bioreactors subjected to high sulfate loading rate or acidity: variations in microbial consortia
title Sulfate-reducing bioreactors subjected to high sulfate loading rate or acidity: variations in microbial consortia
title_full Sulfate-reducing bioreactors subjected to high sulfate loading rate or acidity: variations in microbial consortia
title_fullStr Sulfate-reducing bioreactors subjected to high sulfate loading rate or acidity: variations in microbial consortia
title_full_unstemmed Sulfate-reducing bioreactors subjected to high sulfate loading rate or acidity: variations in microbial consortia
title_short Sulfate-reducing bioreactors subjected to high sulfate loading rate or acidity: variations in microbial consortia
title_sort sulfate-reducing bioreactors subjected to high sulfate loading rate or acidity: variations in microbial consortia
topic Original Article
url https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9288570/
https://www.ncbi.nlm.nih.gov/pubmed/35841424
http://dx.doi.org/10.1186/s13568-022-01438-2
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