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A Resilient and Nature-Based Drinking Water Supply Source for Saline and Arsenic Prone Coastal Aquifers of the Bengal Delta

Author

Listed:
  • Khurshid Jahan

    (University of Maryland Center for Environmental Science, Cambridge, MD 21513, USA)

  • Anwar Zahid

    (Ground Water Hydrology, Bangladesh Water Development Board, Dhaka 1215, Bangladesh)

  • Md Abul Ehsan Bhuiyan

    (Department of Civil and Environmental Engineering, University of Massachusetts, Amherst, MA 02115, USA)

  • Iqbal Ali

    (Action Research for Community Adaptation in Bangladesh, Dhaka 1212, Bangladesh)

Abstract

Salinity causes a hostile environmental impact throughout the year in the coastal region of Bangladesh, and its severity increases day by day. Because of upstream freshwater flow reduction and massive groundwater extraction, salinity has increased substantially over the last three decades. Moreover, arsenic contamination in shallow groundwater makes the groundwater unsuitable for potable use. Consequently, the coastal area suffers from acute storage of safe water supply. Salinity also negatively impacts human activities, livelihood, agricultural production, and the aquatic ecosystem. Though the shallow aquifer contains high salinity and a small amount of Arsenic (As), the very shallow aquifer (within 3m to 8m) contains fresh water in many areas in the rainy season due to the direct recharge of rainwater. However, rainfall recharge varies significantly depending on the geological and hydrogeological settings. Specifically, up to 50% of annual rainfall is stored in shallow aquifers of Quaternary sands through direct infiltration. The research’s principal objective is to identify the safe and sustainable drinking water source in the arsenic and saline-prone coastal region. Groundwater samples were collected from the different locations of the study area during both dry and wet seasons and examined seasonal variations in groundwater table and salinity levels. The chemical analyses and Physico-chemical parameters indicate that the groundwater samples are suitable for drinking. Except for some groundwater samples from the wet season, the salinity of all samples was under the allowable limit for Bangladesh (<2000 µS/cm), and the targeted aquifer was almost arsenic (50 µg/l) free. Therefore, a comprehensive analysis has been made to accomplish the study goals. Particularly, the groundwater’s electrical conductivity (EC) values of most samples were measured within the limit of fresh or brackish water (<2000 μS/cm). Overall, the results indicate the prospect of a very shallow aquifer as a source of freshwater for drinking purposes throughout the year, considering both arsenic and salinity, which effectively solve the freshwater shortage, especially in the saline-arsenic prone area.

Suggested Citation

  • Khurshid Jahan & Anwar Zahid & Md Abul Ehsan Bhuiyan & Iqbal Ali, 2022. "A Resilient and Nature-Based Drinking Water Supply Source for Saline and Arsenic Prone Coastal Aquifers of the Bengal Delta," Sustainability, MDPI, vol. 14(11), pages 1-22, May.
  • Handle: RePEc:gam:jsusta:v:14:y:2022:i:11:p:6703-:d:828135
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    References listed on IDEAS

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