Effects of sulfate reducing bacteria and sulfate concentrations on mercury methylation in freshwater sediments

Shao, Dingding; Kang, Yuan; Wu, Shengchun; Wong, Ming Hung

doi:10.1016/j.scitotenv.2011.09.042

Cited by 78 publications

(44 citation statements)

References 24 publications

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“…has been involved in mercury methylation and the in treatment of acid mine drainage (Martins et al 2009a;Shao et al 2012;Deng et al 2016). Desulfovibrio spp.…”

Section: Evaluation Of Pg Impact On the Bacterial Communities Structurementioning

confidence: 99%

Performance and Bacterial Community Shifts During Phosphogypsum Biotransformation

Martins

Assunção

Neto

et al. 2016

Water Air Soil Pollut

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Phosphogypsum (PG) is an industrial waste composed mainly by sulphate, turning it a suitable sulphate source for sulphate-reducing bacteria (SRB). In the present work the capability of two SRB communities, one enriched from Portuguese PG (culture PG) and other from sludge from a wastewater treatment plant (culture WWT-1), to use sulphate from PG, was compared. In addition, the impact of this sulphate-rich waste in the microbial community was assessed. The highest efficiency in terms of sulphate reduction was observed with culture WWT-1. The bacterial composition of this culture was not significantly affected when sodium sulphate from the nutrient medium was replaced by PG as sulphate source. Next generation sequencing (NGS) showed that this community was phylogenetically diverse, composed by bacteria affiliated to Clostridium, Arcobacter and Sulfurospirillum genera and by SRB belonging to Desulfovibrio, Desulfomicrobium and Desulfobulbus genera. In contrast, the bacterial structure of the community enriched from PG was modified when sodium sulphate was replaced by PG as sulphate source. This culture, which showed the poorest performance in the use of sulphate from PG, was mainly composed by SRB related to Desulfosporosinus genus. The present work provides new information regarding the phylogenetic characterization of anaerobic bacterial communities with the ability to use PG as sulphate donor, thus contributing to improve the knowledge of microorganisms suitable to be used in PG bioremediation. Additionally, this paper demonstrates that an alternative to lactate and low-cost carbon source (wine wastes) can be used efficiently for that purpose.

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“…has been involved in mercury methylation and the in treatment of acid mine drainage (Martins et al 2009a;Shao et al 2012;Deng et al 2016). Desulfovibrio spp.…”

Section: Evaluation Of Pg Impact On the Bacterial Communities Structurementioning

confidence: 99%

Performance and Bacterial Community Shifts During Phosphogypsum Biotransformation

Martins

Assunção

Neto

et al. 2016

Water Air Soil Pollut

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“…In this study, all of the concentrations of sulfate in the leachate were much higher than 50 mg L À1 , which exceed the optimal sulfate concentration ranges (20 to 50 mg L À1 ) for Hg methylation by SRB as reported by Gilmour et al (1992). Previous findings suggested that low sulfate concentrations stimulate the reduction of SO 4 2À to sulfide by SRB, and this SO 4 2À reduction stimulates Hg methylation (King et al, 1999;Han et al, 2010;Bergman et al, 2012), whereas high sulfate concentrations that exceed the optimal concentration ranges inhibit methylation (Gilmour et al, 1992;Shao et al, 2012). With the oxygen in the refuse consumed up, the ORP in the landfill decreased and became anaerobic, which was favorable for the reduction of sulfate.…”

Section: Sulfatementioning

confidence: 45%

The dependence of the methylation of mercury on the landfill stabilization process and implications for the landfill management

Chai

Hao

et al. 2015

Chemosphere

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“…For instance, in forested wetland-dominated watersheds, the stimulation of microbial MeHg production would be fueled by the oxidation of abundant organic matter as microbial respiration of organic carbon leads to the development of anoxic conditions which in turn favors sulfate reduction by sulfate reducing bacteria (SRB). The latter are one of the prevalent microbial groups linked to Hg methylation in several published studies (Gilmour et al 1992;King et al 2000;Drott et al 2007;Shao et al 2012). Also, wetlands have been identified as factories of MeHg production (St. Louis et al 1994;Branfireun et al 1999;Hall et al 2008) and would likely behave as sources of both MeHg and DOC to rivers when present within watersheds.…”

Section: Resultsmentioning

confidence: 99%

Linking landscape development intensity within watersheds to methyl-mercury accumulation in river sediments

Donkor

Attibayeba

Gao

2015

Ambio

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An indicator of the disturbance of natural systems, the landscape development intensity (LDI) index, was used to assess the potential for land-use within watersheds to influence the production/ accumulation of methyl-mercury (MeHg) in river sediments. Sediment samples were collected from locations impacted by well-identified land-use types within the Mobile-Alabama River Basin in Southeastern USA. The samples were analyzed for total-Hg (THg) and MeHg concentrations and the obtained values correlated to the calculated LDI indexes of the sampled watersheds to assess the impact of prevalent land use/land cover on MeHg accumulation in sediments. The results show that unlike THg, levels of MeHg found in sediments are impacted by the LDI indexes. Overall, certain combinations of land-use types within a given watershed appear to be more conducive to MeHg accumulation than others, therefore, pointing to the possibility of targeting land-use practices as potential means for reducing MeHg accumulation in sediments, and ultimately, fish contamination.

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Effects of sulfate reducing bacteria and sulfate concentrations on mercury methylation in freshwater sediments

Cited by 78 publications

References 24 publications

Performance and Bacterial Community Shifts During Phosphogypsum Biotransformation

Performance and Bacterial Community Shifts During Phosphogypsum Biotransformation

The dependence of the methylation of mercury on the landfill stabilization process and implications for the landfill management

Linking landscape development intensity within watersheds to methyl-mercury accumulation in river sediments

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