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Groundwater Quality of Meghna River Basin Aquifers

  • Abhijit MukherjeeEmail author
  • Prosun Bhattacharya
  • Kazi Matin Ahmed
Chapter
Part of the Springer Hydrogeology book series (SPRINGERHYDRO)

Abstract

The Meghna river basin in the eastern parts of Bangladesh is regarded as one of the most enriched groundwater systems of South Asia. The river, together with Ganges and Brahmaputra, forms the largest fluvio-deltaic system of the world. The fluvial depositional processes have resulted in the formation of the confined to semi-confined, multilayered aquifer system of the area, with groundwater composition ranging between Ca–HCO3–Ca–Na–HCO3 and Mg–Ca–Cl hydrochemical facies. The highly As-polluted groundwater chemistry is characterized by reducing postoxic environments and being dominated by metal-/metalloid-reducing processes in the presence of abundant organic matter in the abandoned channels of the Meghna floodplains. The various redox-sensitive solutes are found to be coexisting, suggesting partial redox equilibrium condition with overlapping redox zones. The reductively dissolved As, after being liberated from its source minerals, tends to remain in solution because of the complex interplay among the redox-sensitive hydrogeochemical processes.

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Copyright information

© Springer Nature Singapore Pte Ltd. 2018

Authors and Affiliations

  • Abhijit Mukherjee
    • 1
    • 2
    • 3
    Email author
  • Prosun Bhattacharya
    • 4
    • 5
  • Kazi Matin Ahmed
    • 6
  1. 1.Department of Geology and GeophysicsIndian Institute of Technology (IIT)—KharagpurKharagpurIndia
  2. 2.School of Environmental Science and EngineeringIndian Institute of Technology (IIT)—KharagpurKharagpurIndia
  3. 3.Applied Policy Advisory to Hydrogeosciences (APAH) GroupIndian Institute of Technology (IIT)—KharagpurKharagpurIndia
  4. 4.KTH-International Groundwater Arsenic Research Group, Department of Sustainable Development, Environmental Science and EngineeringKTH Royal Institute of TechnologyStockholmSweden
  5. 5.School of Civil Engineering and Surveying & International Centre for Applied Climate Science, Faculty of Health, Engineering and SciencesUniversity of Southern QueenslandToowoombaAustralia
  6. 6.Department of Geology, Faculty of Earth and Environmental SciencesUniversity of DhakaDhakaBangladesh

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