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Distinct Function of Metal-Reducing Bacteria from Sediment andGroundwater in Controlling the Arsenic Mobilization in SedimentaryAquifer | OMICS International | Abstract
ISSN: 2155-6199

Journal of Bioremediation & Biodegradation
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Research Article

Distinct Function of Metal-Reducing Bacteria from Sediment andGroundwater in Controlling the Arsenic Mobilization in SedimentaryAquifer

Kuang-Liang Lu, Chen-Wuing Liu*, Vivian Hsiu-Chuan Liao and Chung-Ming Liao
Department of Bioenvironmental Systems Engineering, National Taiwan University, Taipei, Taiwan, 106, ROC
Corresponding Author : Chen-Wuing Liu
Department of Bioenvironmental Systems Engineering
National Taiwan University, Taipei, Taiwan, 106, ROC
Tel: +886223626480
Fax: +886223639557
E-mail address: [email protected]
Received: January 11, 2016; Accepted: January 22, 2016; Published: January 26, 2016
Citation: Lu KL, Liu CW, Liao VHC, Liao CM (2016) Distinct Function of Metal- Reducing Bacteria from Sediment and Groundwater in Controlling the Arsenic Mobilization in Sedimentary Aquifer. J Bioremed Biodeg 7:326. doi:10.4172/2155- 6199.1000326
Copyright: © 2016 Lu KL, et al. This is an open-a ccess article distributed under the terms of the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original author and source are credited.


Microbially mediated dissolution of iron oxyhydroxides plays a defining role in the arsenic (As) release in most reducing environments, though the nature of this relationship remain unclear. This study aimed to evaluate the microbial processes on the enhancement or inhibition of As release as a function of bacterial enrichments from groundwater and core sediments. Two enrichment cultures of reducing bacteria (RB) used were cultivated from core sediment (RB-S) and groundwater (RB-W). The microcosm experiments were systematically conducted to assess microbially mediated reactions for the mobility of As from sediment into groundwater. From the analysis results, simultaneous bioreduction of As and Fe contributed to the initial elevation of aqueous As. Distinct distribution patterns of aqueous As and Fe between RW-S and RB-W revealed the different microbial activities. RB-W showed strong affinity for solid As, leading to high level of aqueous As. In contrast, RB-S exhibited high reducing ability toward Fe minerals, and the following formation of secondary Fe-As minerals constrained dissolved As. By amending with non-sterile groundwater, we also observed the chelating solubilization of As-contained Fe minerals, leading to the increase of As(III) and Fe(III). This comparative study illustrates the distinct function of indigenous metal-reducing microbes cultured from groundwater and sediment in liberating aquifer As and Fe. Our results provide evidence that the release and sequestration of As are closely related to specific microbial population in aquifer. The limitation of bioavailability of As and carbon source further influences the release of As to groundwater.


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