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Coexistence and competition of sulfate-reducing and methanogenic populations in an anaerobic hexadecane-degrading culture
BACKGROUND: Over three-fifths of the world’s known crude oil cannot be recovered using state-of-the-art techniques, but microbial conversion of petroleum hydrocarbons trapped in oil reservoirs to methane is one promising path to increase the recovery of fossil fuels. The process requires cooperation...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
BioMed Central
2017
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5584521/ https://www.ncbi.nlm.nih.gov/pubmed/28878822 http://dx.doi.org/10.1186/s13068-017-0895-9 |
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author | Ma, Ting-Ting Liu, Lai-Yan Rui, Jun-Peng Yuan, Quan Feng, Ding-shan Zhou, Zheng Dai, Li-Rong Zeng, Wan-Qiu Zhang, Hui Cheng, Lei |
author_facet | Ma, Ting-Ting Liu, Lai-Yan Rui, Jun-Peng Yuan, Quan Feng, Ding-shan Zhou, Zheng Dai, Li-Rong Zeng, Wan-Qiu Zhang, Hui Cheng, Lei |
author_sort | Ma, Ting-Ting |
collection | PubMed |
description | BACKGROUND: Over three-fifths of the world’s known crude oil cannot be recovered using state-of-the-art techniques, but microbial conversion of petroleum hydrocarbons trapped in oil reservoirs to methane is one promising path to increase the recovery of fossil fuels. The process requires cooperation between syntrophic bacteria and methanogenic archaea, which can be affected by sulfate-reducing prokaryotes (SRPs). However, the effects of sulfate on hydrocarbon degradation and methane production remain elusive, and the microbial communities involved are not well understood. RESULTS: In this study, a methanogenic hexadecane-degrading enrichment culture was treated with six different concentrations of sulfate ranging from 0.5 to 25 mM. Methane production and maximum specific methane production rate gradually decreased to 44 and 56% with sulfate concentrations up to 25 mM, respectively. There was a significant positive linear correlation between the sulfate reduction/methane production ratio and initial sulfate concentration, which remained constant during the methane production phase. The apparent methanogenesis fractionation factor (α (app)) gradually increased during the methane production phase in each treatment, the α (app) for the treatments with lower sulfate (0.5–4 mM) eventually plateaued at ~1.047, but that for the treatment with 10–25 mM sulfate only reached ~1.029. The relative abundance levels of Smithella and Methanoculleus increased almost in parallel with the increasing sulfate concentrations. Furthermore, the predominant sulfate reducer communities shifted from Desulfobacteraceae in the low-sulfate cultures to Desulfomonile in the high-sulfate cultures. CONCLUSION: The distribution of hexadecane carbon between methane-producing and sulfate-reducing populations is dependent on the initial sulfate added, and not affected during the methane production period. There was a relative increase in hydrogenotrophic methanogenesis activity over time for all sulfate treatments, whereas the total activity was inhibited by sulfate addition. Both Smithella and Methanoculleus, the key alkane degraders and methane producers, can adapt to sulfate stress. Specifically, different SRP populations were stimulated at various sulfate concentrations. These results could help to evaluate interactions between sulfate-reducing and methanogenic populations during anaerobic hydrocarbon degradation in oil reservoirs. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s13068-017-0895-9) contains supplementary material, which is available to authorized users. |
format | Online Article Text |
id | pubmed-5584521 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2017 |
publisher | BioMed Central |
record_format | MEDLINE/PubMed |
spelling | pubmed-55845212017-09-06 Coexistence and competition of sulfate-reducing and methanogenic populations in an anaerobic hexadecane-degrading culture Ma, Ting-Ting Liu, Lai-Yan Rui, Jun-Peng Yuan, Quan Feng, Ding-shan Zhou, Zheng Dai, Li-Rong Zeng, Wan-Qiu Zhang, Hui Cheng, Lei Biotechnol Biofuels Research BACKGROUND: Over three-fifths of the world’s known crude oil cannot be recovered using state-of-the-art techniques, but microbial conversion of petroleum hydrocarbons trapped in oil reservoirs to methane is one promising path to increase the recovery of fossil fuels. The process requires cooperation between syntrophic bacteria and methanogenic archaea, which can be affected by sulfate-reducing prokaryotes (SRPs). However, the effects of sulfate on hydrocarbon degradation and methane production remain elusive, and the microbial communities involved are not well understood. RESULTS: In this study, a methanogenic hexadecane-degrading enrichment culture was treated with six different concentrations of sulfate ranging from 0.5 to 25 mM. Methane production and maximum specific methane production rate gradually decreased to 44 and 56% with sulfate concentrations up to 25 mM, respectively. There was a significant positive linear correlation between the sulfate reduction/methane production ratio and initial sulfate concentration, which remained constant during the methane production phase. The apparent methanogenesis fractionation factor (α (app)) gradually increased during the methane production phase in each treatment, the α (app) for the treatments with lower sulfate (0.5–4 mM) eventually plateaued at ~1.047, but that for the treatment with 10–25 mM sulfate only reached ~1.029. The relative abundance levels of Smithella and Methanoculleus increased almost in parallel with the increasing sulfate concentrations. Furthermore, the predominant sulfate reducer communities shifted from Desulfobacteraceae in the low-sulfate cultures to Desulfomonile in the high-sulfate cultures. CONCLUSION: The distribution of hexadecane carbon between methane-producing and sulfate-reducing populations is dependent on the initial sulfate added, and not affected during the methane production period. There was a relative increase in hydrogenotrophic methanogenesis activity over time for all sulfate treatments, whereas the total activity was inhibited by sulfate addition. Both Smithella and Methanoculleus, the key alkane degraders and methane producers, can adapt to sulfate stress. Specifically, different SRP populations were stimulated at various sulfate concentrations. These results could help to evaluate interactions between sulfate-reducing and methanogenic populations during anaerobic hydrocarbon degradation in oil reservoirs. ELECTRONIC SUPPLEMENTARY MATERIAL: The online version of this article (doi:10.1186/s13068-017-0895-9) contains supplementary material, which is available to authorized users. BioMed Central 2017-09-05 /pmc/articles/PMC5584521/ /pubmed/28878822 http://dx.doi.org/10.1186/s13068-017-0895-9 Text en © The Author(s) 2017 Open AccessThis article is distributed under the terms of the Creative Commons Attribution 4.0 International License (http://creativecommons.org/licenses/by/4.0/), which permits unrestricted use, distribution, and reproduction in any medium, provided you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The Creative Commons Public Domain Dedication waiver (http://creativecommons.org/publicdomain/zero/1.0/) applies to the data made available in this article, unless otherwise stated. |
spellingShingle | Research Ma, Ting-Ting Liu, Lai-Yan Rui, Jun-Peng Yuan, Quan Feng, Ding-shan Zhou, Zheng Dai, Li-Rong Zeng, Wan-Qiu Zhang, Hui Cheng, Lei Coexistence and competition of sulfate-reducing and methanogenic populations in an anaerobic hexadecane-degrading culture |
title | Coexistence and competition of sulfate-reducing and methanogenic populations in an anaerobic hexadecane-degrading culture |
title_full | Coexistence and competition of sulfate-reducing and methanogenic populations in an anaerobic hexadecane-degrading culture |
title_fullStr | Coexistence and competition of sulfate-reducing and methanogenic populations in an anaerobic hexadecane-degrading culture |
title_full_unstemmed | Coexistence and competition of sulfate-reducing and methanogenic populations in an anaerobic hexadecane-degrading culture |
title_short | Coexistence and competition of sulfate-reducing and methanogenic populations in an anaerobic hexadecane-degrading culture |
title_sort | coexistence and competition of sulfate-reducing and methanogenic populations in an anaerobic hexadecane-degrading culture |
topic | Research |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC5584521/ https://www.ncbi.nlm.nih.gov/pubmed/28878822 http://dx.doi.org/10.1186/s13068-017-0895-9 |
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