Influence of clay minerals on sorption and bioreduction of arsenic under anoxic conditions

Title
Influence of clay minerals on sorption and bioreduction of arsenic under anoxic conditions
Authors
Kurade, Mayur Bharat
Keywords
Adsorption; Arsenic; Bioreduction; Clay minerals; Shewanella putrefaciens
Issue Date
2015-05
Publisher
SPRINGER
Citation
ENVIRONMENTAL GEOCHEMISTRY AND HEALTH, v. 37, Page. 997-1005
Abstract
Adsorption of As(V) on various clay minerals including kaolinite (KGa-1), montmorillonite (SWy-1) and nontronites (NAU-1 and NAU-2), and subsequent bioreduction of sorbed As(V) to As(III) by bacterium Shewanella putrefaciens strain CN-32 were investigated. Nontronites showed relatively higher sorption capacity for As(V) primarily due to higher iron oxide content. Freundlich equation well described the sorption of As(V) on NAU-1, NAU-2 and SWy-1, while As(V) sorption isotherm with KGa-1 fitted well in the Langmuir model. The bacterium rapidly reduced 50 % of dissolved As(V) to As(III) in 2 h, followed by its complete reduction (˃ ca. 98 %) within 12 h. In contrast, sorption of As(V) to the mineral surfaces interferes with the activity of bacterium, resulting in low bioreduction of As(V) by 27 % for 5 days of incubation. S. putrefaciens also promoted the reduction of Fe(III) present in the clay mineral to Fe(II). This study indicates that the sorption and subsequent bioreduction of As(V) on clay minerals can significantly influence the mobility of As(V) in subsurface environment.
URI
http://link.springer.com/article/10.1007%2Fs10653-015-9708-xhttp://hdl.handle.net/20.500.11754/24708
ISSN
0269-4042; 1573-2983
DOI
http://dx.doi.org/10.1007/s10653-015-9708-x
Appears in Collections:
COLLEGE OF ENGINEERING[S](공과대학) > ETC
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