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https://hdl.handle.net/1822/46344
Título: | Geochemical and microbial community determinants of reductive dechlorination at a site biostimulated with glycerol |
Autor(es): | Atashgahi, Siavash Lu, Yue Zheng, Ying Saccenti, Edoardo Suarez-Diez, Maria Ramiro-Garcia, Javier Eisenmann, Heinrich Elsner, Martin Stams, Alfons Johannes Maria Springael, Dirk Dejonghe, Winnie Smidt, Hauke |
Data: | Mar-2017 |
Editora: | Wiley-Blackwell |
Revista: | Environmental Microbiology |
Citação: | Atashgahi, Siavash; Lu, Yue; Zheng, Ying; Saccenti, Edoardo; Suarez-Diez, Maria; Ramiro-Garcia, Javier; Eisenmann, Heinrich; Elsner, Martin; Stams, A. J. M.; Springael, Dirk; Dejonghe, Winnie; Smidt, Hauke, Geochemical and microbial community determinants of reductive dechlorination at a site biostimulated with glycerol. Environmental Microbiology, 19(3), 968-981, 2017 |
Resumo(s): | Biostimulation is widely used to enhance reductive dechlorination of chlorinated ethenes in contaminated aquifers. However, the knowledge on corresponding biogeochemical responses is limited. In this study glycerol was injected in an aquifer contaminated with cis-dichloroethene (cDCE), and geochemical and microbial shifts were followed for 265 days. Consistent with anoxic conditions and sulfate reduction after biostimulation, MiSeq 16S rRNA gene sequencing revealed temporarily increased relative abundance of Firmicutes, Bacteriodetes and sulfate reducing Deltaproteobacteria. In line with 13C cDCE enrichment and increased Dehalococcoides mccartyi (Dcm) numbers, dechlorination was observed towards the end of the field experiment, albeit being incomplete with accumulation of vinyl chloride. This was concurrent with i) decreased concentrations of dissolved organic carbon (DOC), reduced relative abundances of fermenting and sulfate reducing bacteria that have been suggested to promote Dcm growth by providing electron donor (H2) and essential corrinoid cofactors, ii) increased sulfate concentration and increased relative abundance of Epsilonproteobacteria and Deferribacteres as putative oxidizers of reduced sulfur compounds. Strong correlations of DOC, relative abundance of fermenters and sulfate reducers, and dechlorination imply the importance of syntrophic interactions to sustain robust dechlorination. Tracking microbial and environmental parameters that promote/preclude enhanced reductive dechlorination should aid development of sustainable bioremediation strategies. This article is protected by copyright. All rights reserved. |
Tipo: | Artigo |
URI: | https://hdl.handle.net/1822/46344 |
DOI: | 10.1111/1462-2920.13531 |
ISSN: | 1462-2912 |
e-ISSN: | 1462-2920 |
Versão da editora: | http://onlinelibrary.wiley.com/journal/10.1111/(ISSN)1462-2920 |
Arbitragem científica: | yes |
Acesso: | Acesso aberto |
Aparece nas coleções: | CEB - Publicações em Revistas/Séries Internacionais / Publications in International Journals/Series |
Ficheiros deste registo:
Ficheiro | Descrição | Tamanho | Formato | |
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document_45177_1.pdf | 849,89 kB | Adobe PDF | Ver/Abrir |