Modular treatment of arsenic-laden brackish groundwater using solar-powered subsurface arsenic removal (SAR) and membrane capacitive deionization (MCDI) in Vietnam

Hellriegel, U. and Kurz, E. E. Canas and Luong, T. V. and Bundschuh, J. and Hoinkis, J. (2020) Modular treatment of arsenic-laden brackish groundwater using solar-powered subsurface arsenic removal (SAR) and membrane capacitive deionization (MCDI) in Vietnam. Journal of Water Reuse and Desalination, 10 (4). pp. 513-526. ISSN 2220-1319

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Abstract

To evaluate energy efficient concepts for the modular treatment of brackish water, pilot trials for groundwater desalination and arsenic (As) removal were carried out in the Mekong Delta, Vietnam. Groundwater here is affected by naturally occurring high iron (Fe2+) and As concentrations, while, in coastal regions, groundwater is additionally contaminated by high salinity mostly due to seawater intrusion. Desalination was conducted by membrane capacitive deionization (MCDI), which shows low specific energy consumption (SEC). Anoxic groundwater with As(III) and Fe2+ was treated using a pre-oxidation step called subsurface arsenic removal (SAR) with the main advantage that no As-laden waste is produced. The pilot plant was operated using a photovoltaic system (3 kWp) and a small wind turbine (2 kWp). The SEC of drinking water produced was 3.97 kWh/m3. Total dissolved solids (TDS) of 1,560 mg/L were lowered to 188 mg/L, while Fe2+ was reduced from 1.8 mg/L to the below detection limit and As from 2.3 to 0.18 μg/L. The results show that SAR is a feasible remediation technique for Fe2+ and As removal in remote areas, and demonstrate the potential of MCDI for brackish water desalination coupled with renewable energies. However, improvements in energy demand of the MCDI module can still be achieved.


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Item Type: Article (Commonwealth Reporting Category C)
Refereed: Yes
Item Status: Live Archive
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Faculty/School / Institute/Centre: Historic - Faculty of Health, Engineering and Sciences - School of Civil Engineering and Surveying (1 Jul 2013 - 31 Dec 2021)
Date Deposited: 21 Jun 2022 02:44
Last Modified: 30 Nov 2022 08:37
Uncontrolled Keywords: Arsenic removal; Coastal groundwater; Desalination; MCDI; Pilot scale; Renewable energy
Fields of Research (2008): 09 Engineering > 0904 Chemical Engineering > 090403 Chemical Engineering Design
04 Earth Sciences > 0402 Geochemistry > 040202 Inorganic Geochemistry
09 Engineering > 0904 Chemical Engineering > 090410 Water Treatment Processes
09 Engineering > 0905 Civil Engineering > 090508 Water Quality Engineering
09 Engineering > 0907 Environmental Engineering > 090799 Environmental Engineering not elsewhere classified
Fields of Research (2020): 40 ENGINEERING > 4011 Environmental engineering > 401199 Environmental engineering not elsewhere classified
37 EARTH SCIENCES > 3703 Geochemistry > 370302 Inorganic geochemistry
40 ENGINEERING > 4004 Chemical engineering > 400403 Chemical engineering design
40 ENGINEERING > 4004 Chemical engineering > 400411 Water treatment processes
Identification Number or DOI: https://doi.org/10.2166/wrd.2020.031
URI: http://eprints.usq.edu.au/id/eprint/49229

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