Removal of Arsenic from Arsenic Rich Sludge by Volatilization Using Anaerobic Microorganisms Treated with Cow Dung

Mohapatra, Debasish; Mishra, Dhaneshwar; Chaudhury, G. Roy; Das, R.P.

doi:10.1080/15320380802007069

Cited by 31 publications

(37 citation statements)

References 20 publications

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“…However, previous studies have indicated that an increase in OM addition does not always result in an increase of As volatilization. 8 Arsine fluxes from CT and DT2 were several times higher than those of Bangladesh paddy soils amended with 10% cow dung or rice straw in a previous study. 10 This was due in part to relatively high As concentration in soil solution in the present study, since the concentration was positively correlated with As flux.…”

Section: ■ Resultsmentioning

confidence: 51%

Arsenic Speciation and Volatilization from Flooded Paddy Soils Amended with Different Organic Matters

Huang

Jia

Sun

et al. 2012

Environ. Sci. Technol.

150

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Arsenic (As) methylation and volatilization in soil can be increased after organic matter (OM) amendment, though the factors influencing this are poorly understood. Herein we investigate how amended OM influences As speciation as well as how it alters microbial processes in soil and soil solution during As volatilization. Microcosm experiments were conducted on predried and fresh As contaminated paddy soils to investigate microbial mediated As speciation and volatilization under different OM amendment conditions. These experiments indicated that the microbes attached to OM did not significantly influence As volatilization. The arsine flux from the treatment amended with 10% clover (cloveramended treatment, CT) and dried distillers grain (DDG) (DDG-amended treatment, DT2) were significantly higher than the control. Trimethylarsine (TMAs) was the dominant species in arsine derived from CT, whereas the primary arsine species from DT2 was TMAs and arsine (AsH 3 ), followed by monomethylarsine (MeAsH 2 ). The predominant As species in the soil solutions of CT and DT2 were dimethylarsinic acid (DMAA) and As(V), respectively. OM addition increased the activities of arseniteoxidizing bacteria (harboring aroA-like genes), though they did not increase or even decrease the abundance of arsenite oxidizers. In contrast, the abundance of arsenate reducers (carrying the arsC gene) was increased by OM amendment; however, significant enhancement of activity of arsenate reducers was observed only in CT. Our results demonstrate that OM addition significantly increased As methylation and volatilization from the investigated paddy soil. The physiologically active bacteria capable of oxidization, reduction, and methylation of As coexisted and mediated the As speciation in soil and soil solution.

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Section: ■ Resultsmentioning

confidence: 51%

Arsenic Speciation and Volatilization from Flooded Paddy Soils Amended with Different Organic Matters

Huang

Jia

Sun

et al. 2012

Environ. Sci. Technol.

150

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“…Arsenic volatilization by anaerobic methanogenic bacteria were enhanced by adding inexpensive nutrient such as cow dung under laboratory condition. Maximum As volatilization (35%) was obtained at a substrate (cow dung) concentration of 25 g/L and initial As concentration of 30 mg/L (Mohapatra et al, 2008). It is possible that the methylating microbes present in the supplied manure increased As loss from the soils (Cullen and Reimer, 1989).…”

Section: Factors Influencing As Bio-volatilization 31 Biostimulationmentioning

confidence: 90%

A review on completing arsenic biogeochemical cycle: Microbial volatilization of arsines in environment

Wang¹,

Sun²,

Jia³

et al. 2014

Journal of Environmental Sciences

137

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a b s t r a c t Arsenic (As) is ubiquitous in the environment in the carcinogenic inorganic forms, posing risks to human health in many parts of the world. Many microorganisms have evolved a series of mechanisms to cope with inorganic arsenic in their growth media such as transforming As compounds into volatile derivatives. Bio-volatilization of As has been suggested to play an important role in global As biogeochemical cycling, and can also be explored as a potential method for arsenic bioremediation. This review aims to provide an overview of the quality and quantity of As volatilization by fungi, bacteria, microalga and protozoans. Arsenic bio-volatilization is influenced by both biotic and abiotic factors that can be manipulated/elucidated for the purpose of As bioremediation. Since As biovolatilization is a resurgent topic for both biogeochemistry and environmental health, our review serves as a concept paper for future research directions.

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“…51 The levels of As methylation and volatilization were enhanced by adding organic matter to soils, such as manure, cow dung, and dried distillers grain. 21,52,53 One possible explanation is that the concentrations of the thiols in soils were increased through the decomposition of organic matters 54 and the uptake of thiols by soil microbes (such as archaea) improved As biomethylation.…”

Section: ■ Discussionmentioning

confidence: 99%

Identification and Characterization of Arsenite Methyltransferase from an Archaeon,Methanosarcina acetivoransC2A

Wang

Sun

Zhu

2014

Environ. Sci. Technol.

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Arsenic is a ubiquitous toxic contaminant in the environment. The methylation of arsenic can affect its toxicity and is primarily mediated by biological processes. Few studies have focused on the mechanism of arsenic methylation in archaea although archaea are widespread in the environment. Here, an arsenite [As(III)] methyltransferase (ArsM) was identified and characterized from an archaeon Methanosarcina acetivorans C2A. Heterologous expression of MaarsM was shown to confer As(III) resistance to an arsenic-sensitive strain of E. coli through arsenic methylation and subsequent volatilization. Purified MaArsM protein was further identified the function in catalyzing the formation of various methylated products from As(III) in vitro. Methylation of As(III) by MaArsM is highly dependent on the characteristics of the thiol cofactors used, with some of them (coenzyme M, homocysteine, and dithiothreitol) more efficient than GSH. Site-directed mutagenesis demonstrated that three conserved cysteine (Cys) residues (Cys62, Cys150, and Cys200) in MaArsM were necessary for As(III) methylation, of which only Cys150 and Cys200 were required for the methylation of monomethylarsenic. These results present a molecular pathway for arsenic methylation in archaea and provide some insight into the role of archaea in As biogeochemistry.

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Removal of Arsenic from Arsenic Rich Sludge by Volatilization Using Anaerobic Microorganisms Treated with Cow Dung

Cited by 31 publications

References 20 publications

Arsenic Speciation and Volatilization from Flooded Paddy Soils Amended with Different Organic Matters

Arsenic Speciation and Volatilization from Flooded Paddy Soils Amended with Different Organic Matters

A review on completing arsenic biogeochemical cycle: Microbial volatilization of arsines in environment

Identification and Characterization of Arsenite Methyltransferase from an Archaeon,Methanosarcina acetivoransC2A

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