Hydrogeochemical contrasts across the multi-level aquifers of Bengal Basin in Matlab, Bangladesh: implications for arsenic free and low-manganese drinking water sources

Bhattacharya, P. and Hossain, M. and Jacks, G. and Ahmed, K. Matin and Hasan, M. A. and von Bromssen, M. and Frape, S. K. (2016) Hydrogeochemical contrasts across the multi-level aquifers of Bengal Basin in Matlab, Bangladesh: implications for arsenic free and low-manganese drinking water sources. In: 6th International Congress on Arsenic in the Environment: Arsenic Research and Global Sustainability (AS 2016), 19-23 June 2016, Stockholm, Sweden.


Abstract

Targeting shallow, intermediate-deep and deep aquifers, piezometers nests were installed at 15 locations in the Matlab region, an As hotspot in southeastern Bangladesh. Groundwater levels and water quality were monitored for over a three years period. Stable isotopic composition was used to identify the hydrogeological characteristics of different aquifers, hydraulic connectivity between the contaminated and safe aquifers. Within the shallow depth (up to 100m), two aquifers (Aquifer-1 and Aquifer-2) were identified, and groundwater from Aquifer-1 indicated consistently high As concentration was found to be As-enriched (median As levels upto 714 μg/L). Considerable variability in As concentrations were observed in Aquifer-2 wells (6–30 μg/L) comprising relatively oxidized or less reduced red and off-white sands. The intermediate-deep and deep aquifers were found to contain very low As concentration and these aquifers are hydraulically separated from the shallow aquifers. Groundwater depth and elevation and stable isotope signatures also reflect that intermediate-deep and deep aquifers, in most places belong to the same hydrostratigraphic unit (Aquifer-3).


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Item Type: Conference or Workshop Item (Commonwealth Reporting Category E) (Paper)
Refereed: Yes
Item Status: Live Archive
Additional Information: Copyright © 2016 Taylor and Francis Group, London, UK. All rights reserved. No part of this publication or the information contained herein may be reproduced, stored in a retrieval system, or transmitted in any form or by any means, electronic, mechanical, by photocopying, recording or otherwise, without written prior permission from the publisher.
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 July 2013 -)
Faculty/School / Institute/Centre: Current - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 July 2013 -)
Date Deposited: 25 Feb 2020 02:58
Last Modified: 02 Jul 2020 03:17
Uncontrolled Keywords: aquifers; arsenic; groundwater; groundwater pollution; hydrogeology; isotopes; potable water; sustainable development; water quality
Fields of Research (2008): 04 Earth Sciences > 0406 Physical Geography and Environmental Geoscience > 040603 Hydrogeology
09 Engineering > 0904 Chemical Engineering > 090410 Water Treatment Processes
03 Chemical Sciences > 0399 Other Chemical Sciences > 039901 Environmental Chemistry (incl. Atmospheric Chemistry)
URI: http://eprints.usq.edu.au/id/eprint/36013

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