Remediation of arsenic-contaminated groundwater by in-situ stimulating biogenic precipitation of iron sulfides

Pi, Kunfu; Wang, Yanxin; Xie, Xianjun; Ma, Teng; Liu, Yaqing; Su, Chunli; Zhu, Yapeng; Wang, Zhiqiang

doi:10.1016/j.watres.2016.10.056

Cited by 61 publications

(21 citation statements)

References 42 publications

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“…XRD results confirmed that several iron sulfide minerals formed including mackinawite, arsenopyrite, and pyrite, with mackinawite constituting the predominate iron sulfide mineral formed. When comparing the Pi et al (2017) study with the study documented in this thesis there are some distinct difference that need to be pointed out. Firstly, the addition of organic carbon in the injection solution in this study provided SRB with electrons that aided in the reduction of sulfate into hydrogen sulfide.…”

Section: Comparison To Similar Studiesmentioning

confidence: 93%

“…The data presented in this study demonstrates that indigenous SRB in an arsenic contaminated aquifer with slightly reducing conditions can be stimulated by the injection of an added amendment (organic carbon, FeSO4, and fertilizer) to the point of catalyzing sulfate reduction. These conditions led to the formation of arsenian-pyrite and the subsequent decrease Pi et al (2017), the only other field study that was designed to remove arsenic from a contaminated aquifer through the stimulation of SRB and subsequent precipitation of iron sulfide minerals had success with decreasing the overall concentration of arsenic in the aquifer from 593 µg/L to 136 µg/L (77% removal rate). Their short term (55 day) study involved periodic injections of FeSO4 and anoxic water to facilitate a shift to more sulfate reducing conditions and activating in-situ SRB.…”

Section: Comparison To Similar Studiesmentioning

confidence: 99%

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Pyrite Biomineralization and Arsenic Sequestration at a Florida Industrial Site: Imaging and Geochemical Analysis

Wilson¹

2017

Geological Society of America Abstracts With Programs

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A yearlong field-scale bioremediation experiment was conducted at a Florida industrial site, where groundwater in an unconfined aquifer was contaminated by an arsenic-based herbicide. The bioremediation technique stimulated the indigenous sulfate reducing bacteria (SRB) with a nutrient-rich slurry solution containing labile organic carbon, ferrous iron, sulfate, and fertilizer. This amendment induced sulfate reducing conditions and caused the coprecipitation and adsorption of the dissolved arsenic in biogenic pyrite. This research characterized the biogenic pyrite formed and assessed the spatial and temporal changes in groundwater chemistry during the project. Pyrite was characterized using multiple techniques including X-ray diffraction, X-ray fluorescence, scanning electron microscopy, and electron microprobe analysis. These analyses confirmed the rapid formation of pyrite one week after the injection. The pyrite formed either as well-defined euhedral nano-crystals or as spherical aggregates (framboids) 1-50 µm in diameter. The electron microprobe analysis determined that the pyrite contained between 0.05-0.4 weight % of sequestered arsenic. The dissolved arsenic concentration in the water decreased from pre-injection levels of 300-500 ppb to below the site regulatory limit of 50 ppb (> 90% removal rate) during the initial six month period. The reactive transport of the injectant plume was investigated using a conservative chloride tracer and biomineralization of pyrite along two flow transects. The results show that the stimulated pyrite biomineralization accounted for more than 80% of overall arsenic removal and dilution caused less than 20% of concentration reduction. Saturation index calculations show that arsenian-pyrite iii quickly became oversaturated in targeted wells one week after injection of the solution and then remained mostly saturated during the one-year monitoring period, suggesting that the arsenic sequestration was effectively maintained by the stability of arsenian-pyrite. This research presents data showing through the amendment of a nutrient-rich solution, indigenous SBR can effectively sequester arsenic into pyrite at levels great enough to bring dissolved arsenic concentrations below the regulatory or perhaps even drinking water standards. Grants obtained from the National Science Foundation were integral to the execution of this research. I would like to thank the following people who generously gave their time, advice, and criticisms: Dr. Ming-Kuo Lee, Dr. James Saunders, Dr. Ashraf Uddin, and the entire faculty at the Auburn Department of Geosciences. A special thanks to the chair of my advising committee, Dr. Lee, who provided me with invaluable guidance and mentorship during my time at Auburn. He always had an open door and was more than willing to help with any problem or question I encountered. A thanks is also owed to Dr. Saunders for his guidance and hand in recruiting me to Auburn University. Another member of the Geosciences Department that was vital to my research was Dr. Bil...

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Section: Comparison To Similar Studiesmentioning

confidence: 93%

Section: Comparison To Similar Studiesmentioning

confidence: 99%

Pyrite Biomineralization and Arsenic Sequestration at a Florida Industrial Site: Imaging and Geochemical Analysis

Wilson¹

2017

Geological Society of America Abstracts With Programs

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“…Sulfide generated by sulfate-reducing bacteria in aquifers abiotically reduces As-bearing iron oxides to mobilize As 15–17 . If derived ferrous iron is sufficiently available in groundwater, sulfide could form iron-sulfide minerals to further sequester As through co-precipitation and/or adsorption 18–20 . However, the reductive dissolution mechanism only accounts for the initial trigger of arsenate release from iron oxides, but not for the transformation from arsenate to arsenite in reducing aquifers.…”

Section: Introductionmentioning

confidence: 99%

Arsenic mobilization in a high arsenic groundwater revealed by metagenomic and Geochip analyses

Jiang

Wang

et al. 2019

Sci Rep

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Microbial metabolisms of arsenic, iron, sulfur, nitrogen and organic matter play important roles in arsenic mobilization in aquifer. In this study, microbial community composition and functional potentials in a high arsenic groundwater were investigated using integrated techniques of RNA- and DNA-based 16S rRNA gene sequencing, metagenomic sequencing and functional gene arrays. 16S rRNA gene sequencing showed the sample was dominated by members of Proteobacteria (62.3–75.2%), such as genera of Simplicispira (5.7–6.7%), Pseudomonas (3.3–5.7%), Ferribacterium (1.6–4.4%), Solimonas (1.8–3.2%), Geobacter (0.8–2.2%) and Sediminibacterium (0.6–2.4%). Functional potential analyses indicated that organics degradation, assimilatory sulfate reduction, As-resistant pathway, iron reduction, ammonification, nitrogen fixation, denitrification and dissimilatory nitrate reduction to ammonia were prevalent. The composition and function of microbial community and reconstructed genome bins suggest that high level of arsenite in the groundwater may be attributed to arsenate release from iron oxides reductive dissolution by the iron-reducing bacteria, and subsequent arsenate reduction by ammonia-producing bacteria featuring ars operon. This study highlights the relationship between biogeochemical cycling of arsenic and nitrogen in groundwater, which potentially occur in other aquifers with high levels of ammonia and arsenic.

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“…In addition, microbial activity in aquifers can immensely irritate sulfate reduction and increase generation of ferrous sulfide. Through field practice in the middle of Datong Basin in China, the concentration of As in groundwater decreased from 593 to 136 mg/L and removal rate was up to 77% after 30 days (Pi et al, 2017).…”

Section: Other Repair Technologiesmentioning

confidence: 99%

Current Status and Development of Remediation for Heavy Metals in China

Xiao

Ding

Khan

et al. 2019

Appl Env Biotechnol

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At present, the problem of heavy metal pollution is a hot topic in the world. There are significant differences in the types and concentrations of metal ions distributed in each contaminated sites. In China, due to the vast territory and diverse ecoenvironments, the pollution situation is complex and variable, and the composite pollution is particularly obvious. Overall, pollution in the southern provinces is relatively higher than in other provinces, and Cd, Hg, Pb, Cr, As and Ni are listed as the priority pollutants for control. The metals have different physical or chemical specificity that allows them to be treated differently. Toxic Cr(VI) needs to be reduced to non-toxic Cr(III) before removal, whereas Cd(II) can form an insoluble Cd compound precipitate under alkaline conditions. Nevertheless, the characteristics of the soil itself such as pH, humidity, mineral composition, etc., are the hurdles in the process of remediation. Therefore, this review systematically summarizes the characteristics of heavy metal contaminated soil in major areas of China. It also proposes appropriate restoration methods and schemes such as phytoremediation and microbial remediation, which provides a theoretical basis for the elimination of heavy metals from a polluted land.

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Remediation of arsenic-contaminated groundwater by in-situ stimulating biogenic precipitation of iron sulfides

Cited by 61 publications

References 42 publications

Pyrite Biomineralization and Arsenic Sequestration at a Florida Industrial Site: Imaging and Geochemical Analysis

Pyrite Biomineralization and Arsenic Sequestration at a Florida Industrial Site: Imaging and Geochemical Analysis

Arsenic mobilization in a high arsenic groundwater revealed by metagenomic and Geochip analyses

Current Status and Development of Remediation for Heavy Metals in China

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