Enrichment of indigenous arsenate reducing anaerobic bacteria from arsenic rich aquifer sediment of Brahmaputra river basin and their potential role in as mobilization.

Author(s) Ghosh, S.; Gupta, A.; Sarkar, J.; Verma, S.; Mukherjee, A.; Sar, P.
Journal J Environ Sci Health A Tox Hazard Subst Environ Eng
Date Published 2019
Abstract

Anaerobic enrichment of As reducing bacteria in the presence and/or absence of organic carbon (OC) and As from As contaminated soil of Brahmaputra river basin (BRB) (Jorhat, Assam) was performed. Denaturing gradient gel electrophoresis of the 16SrRNA gene sequences amplified from the enriched microbial community indicated occurrence of maximum diversity under conditions receiving no OC (MSM) followed by moderate OC (LB). However, higher OC or As showed antagonistic effect on bacterial enrichment whereas together (BB + As) they showed a synergistic effect. Phylogenetic analysis of the prominent bands revealed an overall abundance of (39%), (39%), , , (13%), and (8.7%). Moderate OC (LB) led to maximum As mobilization i.e. 27.42 µg/L, whereas presence of added As together with high OC (BB + As) enhanced the mobilization process. Mineralogical analyses of the sediments after incubation showed prominent weathering and loss of crystallinity in MSM and LB. Appearance of a new peak corresponding to arsenolamprite (As) in LB and LB + As indicated opening up of secondary phases of the minerals harboring As due to microbial leaching under moderate OC. This is the first study reporting as a potent As dissimilating bacterium isolated from As contaminated subsurface sediment of BRB.

DOI 10.1080/10934529.2019.1579524
ISSN 1532-4117
Citation Ghosh S, Gupta A, Sarkar J, Verma S, Mukherjee A, Sar P. Enrichment of indigenous arsenate reducing anaerobic bacteria from arsenic rich aquifer sediment of Brahmaputra river basin and their potential role in as mobilization. J Environ Sci Health A Tox Hazard Subst Environ Eng. 2019;54(7):635-647.

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