Effect of oxygen, nitrate and aluminum addition on methylmercury efflux from mine-impacted reservoir sediment

Duvil, Ricardi; Beutel, Marc W.; Fuhrmann, Byran C.; Seelos, Mark

doi:10.1016/j.watres.2018.07.071

Cited by 20 publications

(5 citation statements)

References 69 publications

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“…3. This agreed well with the reported results that MeHg content in sediment was lower under aerobic (bubbled with air) than in anaerobic conditions (bubbled with nitrogen) (Duvil et al, 2018). Hg methylation in natural waters has been reported to be predominantly mediated by microorganisms (Jiang et al, 2018).…”

Section: Effects Of Interfacial Oxygen Nanobubblessupporting

confidence: 93%

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Interfacial oxygen nanobubbles reduce methylmercury production ability of sediments in eutrophic waters

Liu

Pan

2020

Ecotoxicology and Environmental Safety

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Eutrophication can induce hypoxia/anoxia and rich organic matter at the sediment-water interface in surface waters. When eutrophic waters are impacted with mercury (Hg) pollution, methylmercury (MeHg) production ability (MPA) of surface sediment would increase and more MeHg might be produced. To tackle this risk, this study firstly collected samples of surface sediment and overlying water from a typical eutrophic lake-Taihu Lake. Then from a sediment-water simulation system, we demonstrated that eutrophic waters were able to methylate Hg spontaneously, and that sediment is the major Hg sink in the system. After the addition of HgCl2 solution (approximately 1 mg L −1 in the slurry), MeHg concentrations in the sediment increased by 11.7 times after 48 h. The subsequent column experiments proved that O2 nanobubbles could significantly decrease the MPA of surface sediment, by up to 48%. Furthermore, we found that O2 nanobubbles could remediate anoxia mainly by increasing dissolved oxygen (from 0 to 2.1 mg L −1), oxidation-reduction potentials (by 37% on average), and sulfate (by 31% on average) in the overlying water. In addition, O2 nanobubbles could also help decrease organic matter concentration, as was revealed by the decline of dissolved organic carbon in the overlying water (by up to 57%) and total organic carbon in surface sediment (by up to 37%). The remediation of anoxia and reduction of organic matter could contribute to the decrease of hgcA gene abundance (by up to 86%), and thus result in the reduction of MPA after the addition of O2 nanobubbles. This study revealed the risk of MeHg production in case Hg pollution occurs in eutrophic waters and proposed a feasible solution for MeHg remediation.

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Section: Effects Of Interfacial Oxygen Nanobubblessupporting

confidence: 93%

“…Among these factors, DO, ORP, and SO4 2− have been suggested to illustrate the redox conditions in the overlying water (Duvil et al, 2018;Zhang et al, 2018). First of all, as shown in Fig.…”

Section: Variations Of Do Orp So 4 2− and Doc In The Overlying Watermentioning

confidence: 99%

Interfacial oxygen nanobubbles reduce methylmercury production ability of sediments in eutrophic waters

Liu

Pan

2020

Ecotoxicology and Environmental Safety

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“…This points out the variability of natural sediments in terms of both reactive Hg and redox-sensitive compounds. Mn(IV)O 2 likely oxidized sulfide minerals, elemental mercury, and/or natural organic matter containing Hg, releasing Hg(II) into solution and increasing its mobility. ,,, Increased Hg(II) and sulfate in solution could potentially stimulate MeHg production if reducing conditions are reestablished. However, oxidizing conditions with low DOC are not conducive to Hg methylation.…”

Section: Discussionmentioning

confidence: 99%

Evaluation of Manganese Oxide Amendments for Mercury Remediation in Contaminated Aquatic Sediments

et al. 2021

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Aquatic sediments are important sources of toxic methylmercury (MeHg) to the environment because they support anaerobic bacteria that methylate inorganic mercury (Hg). Common Hg remediation strategies such as sediment removal or capping can be prohibitively expensive or impractical when compared to in situ treatment methods designed to disfavor Hg methylation and increase sorption of MeHg to solids. Using profundal sediments from a Hgcontaminated reservoir, we assessed the effectiveness of Mn(IV) oxide (MnOx) amendments in decreasing porewater and sediment Hg and MeHg concentrations relative to sediments treated with granular activated carbon (AC) and unamended controls. We conducted two sediment slurry incubation experiments (0−20 days and 0−5 days) using sediments amended with MnOx, AC, or a mixture of the two. X-ray absorption spectroscopy data showed that the MnOx amendments were rapidly reduced to Mn 2+ over the course of the incubation. In both experiments, MnOx addition resulted in elevated oxidation−reduction potential and lower MeHg concentrations in porewater relative to unamended controls after 2−3 days. The MnOx amendments decreased porewater MeHg with similar or greater effectiveness as AC. However, sediments amended with MnOx released inorganic Hg into porewater in some experiments. Coamendment of MnOx with sorbents could curtail diffusion of MeHg from aquatic sediments and slow MnOx reduction while limiting the release of potentially problematic byproducts such as Mn 2+ and Hg(II).

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“…Experiments revealed that the capacity for mercury methylation in vegetated wetlands is higher than in unvegetated wetlands, probably due to higher dissolved organic matter inputs to vegetated wetlands. Duvil, Beutel, Fuhrmann, and Seelos (2018) assessed potential treatments to reduce influx of methylmercury from old mining contaminated profundal sediment. Experimental results suggested sulfidic conditions reduce mercury methylation, mediated by benthic bacteria.…”

Section: Methylation Of Mercurymentioning

confidence: 99%

Substratum‐associated microbiota

Furey

Liess

Lee

2019

Water Environment Research

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This survey of 2018 literature on substratum-associated microbiota presents brief highlights on research findings from primarily freshwaters, but includes those from a variety of aquatic ecosystems. Coverage of topics associated with benthic algae and cyanobacteria, though not comprehensive, includes new methods, taxa new to science, nutrient dynamics, trophic interactions, herbicides and other pollutants, metal contaminants, nuisance, bloom-forming and harmful algae, bioassessment, and bioremediation. Coverage of bacteria, also not comprehensive, focused on methylation of mercury, metal contamination, toxins, and other environmental pollutants, including oil, as well as the use of benthic bacteria as bioindicators, in bioassessment tools and in biomonitoring. Additionally, we cover trends in recent and emerging topics on substratum-associated microbiota of relevance to the Water Environment Federation.

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Effect of oxygen, nitrate and aluminum addition on methylmercury efflux from mine-impacted reservoir sediment

Cited by 20 publications

References 69 publications

Interfacial oxygen nanobubbles reduce methylmercury production ability of sediments in eutrophic waters

Interfacial oxygen nanobubbles reduce methylmercury production ability of sediments in eutrophic waters

Evaluation of Manganese Oxide Amendments for Mercury Remediation in Contaminated Aquatic Sediments

Substratum‐associated microbiota

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