Desalination and removal of pesticides from surface water in Mekong Delta by coupling electrodialysis and nanofiltration
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The shortage of drinking water is a major problem in the rural areas of the Mekong Delta, especially, when surface water, a main local direct drinking water source is being threatened by pesticide pollution and salinity intrusion. A hybrid process coupling electrodialysis (ED) and nanofiltration (NF) is proposed as an effective process easy to setup in a small plant to treat complex matrix with high salinity and pesticide concentration as is the Mekong Delta surface water. Performance of the ED–NF integration was evaluated with synthetic solutions based on the comparison with a single NF step generally used for pesticide removal. Both energy consumption and water product quality were considered to assess process efficiency. The ED stage was designed to ensure a 50% removal of salinity before applying NF. As expected, the NF rejection is better in the hybrid process than in a case of a single NF step, especially for pesticide rejection. The integration of a NF stage operated with NF270 membrane consumes less energy than that with NF90 membrane but its efficiency was observed not high enough to respect the Vietnamese guidelines. Using NF90, the optimal recovery rate of the NF stage varies from 30 to 50% depending on the salt content in the feed.
KeywordsMekong Delta Hybrid process Nanofiltration; Electrodialysis Pesticide Desalination
D. L. Nguyen received funding from the Vietnamese government (VIED—Vietnam International Education Development—Project 911) by the University of Science and Technology of Hanoi (USTH) and also support from the Campus France during his stay in France.
- Nguyen DL (2016) Membrane technology for treatment of surface water in the Mekong Delta. University of Montpellier, PhD DissertationGoogle Scholar
- Nguyen, Huu Dung, and Thi Thanh Dung Tran. 1997. Research reports: economic and health consequences of pesticide use in paddy production in the Mekong Delta, Vietnam. International Development Research Centre, Ottawa, Canada.Google Scholar
- Reig M, Casas S, Gibert O, Valderrama C, Cortina JL (2016a) Integration of nanofiltration and bipolar electrodialysis for valorization of seawater desalination brines: production of drinking and waste water treatment chemicals. Desalination 382:13–20. https://doi.org/10.1016/j.desal.2015.12.013 CrossRefGoogle Scholar
- Reig M, Casas S, Valderrama C, Gibert O, Cortina JL (2016b) Integration of monopolar and bipolar electrodialysis for valorization of seawater reverse osmosis desalination brines: Production of strong acid and base. Desalination 398:87–97. https://doi.org/10.1016/j.desal.2016.07.024 CrossRefGoogle Scholar
- Salgın S, Salgın U, Soyer N (2013) Streaming potential measurements of polyethersulfone ultrafiltration membranes to determine salt effects on membrane zeta potential. Int J Electrochem Sci 8:4073–4084Google Scholar
- Thanuttamavong M, Yamamoto K, Ik Oh J, Ho Choo K, June Choi S (2002) Rejection characteristics of organic and inorganic pollutants by ultra low-pressure nanofiltration of surface water for drinking water treatment. Desalination 145:257–264. https://doi.org/10.1016/S0011-9164(02)00420-4 CrossRefGoogle Scholar
- Toan, Pham Van, Zita Sebesvari, Melanie Bläsing, Ingrid Rosendahl, and Fabrice G. Renaud. 2013. Pesticide management and their residues in sediments and surface and drinking water in the Mekong Delta, Vietnam. The Science of the Total Environment 452–453. Elsevier B.V.: 28–39. : https://doi.org/10.1016/j.scitotenv.2013.02.026.CrossRefGoogle Scholar
- Wilbers, Gert Jan, Mathias Becker, La Thi Nga, Zita Sebesvari, and Fabrice G Renaud. 2014a. Spatial and temporal variability of surface water pollution in the Mekong Delta, Vietnam. The Science of the Total Environment 485–486. Elsevier B.V.: 653–65. : https://doi.org/10.1016/j.scitotenv.2014.03.049.CrossRefGoogle Scholar