Effects of Activated Carbon and Cationic Exchange Resin Pretreatments on Groundwater Defluoridation by Reverse Osmosis Process

  • Praphasiri Chantharawong Chiang Mai University
  • Aunnop Wongrueng Chiang Mai University
  • Pharkphum Rakruam Chiang Mai University
  • Suraphong Wattanachira Chiang Mai University
  • Satoshi Takizawa University of Tokyo

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Abstract

The objective of this research was to study the effects of a pretreatment using activated carbon and cationic exchange resin on groundwater defluoridation by a reverse osmosis membrane. Actual groundwater containing a high fluoride concentration was collected and examined. Experiments were operated under controlled conditions: a transmembrane pressure of 0.6 MPa and temperature of 25°C. The reverse osmosis system with activated carbon and cationic exchange resin pretreatments had higher fluoride removal than the one without the pretreatments, 97% compared to 95%, respectively. Additionally, the reverse osmosis system with the pretreatments also produced a higher permeate flux, 1.1 x 10-5 compared 9.6 x10-6 m3/m2·s without the pretreatment. When the reverse osmosis systems with and without pretreatments were fouled, they showed a decrease in fluoride rejection, as well as a permeate flux decline. After the fouled reverse osmosis membranes were chemically cleaned, the permeate flux recovery and the fluoride rejection of the osmosis system with the pretreatments improved.  It could be concluded that the activated carbon and cationic exchange resin played an important role in improving the reverse osmosis system as they contributed to high fluoride rejection and high permeate flux.

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Author Biographies
Praphasiri Chantharawong

Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand

Aunnop Wongrueng

Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand
Center of Excellence on Hazardous Substance Management (HSM), Chulalongkorn University, Bangkok 10330, Thailand

Pharkphum Rakruam

Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand

Suraphong Wattanachira

Department of Environmental Engineering, Faculty of Engineering, Chiang Mai University, Chiang Mai 50200, Thailand

Satoshi Takizawa

Department of Urban Engineering, Graduate School of Engineering, the University of Tokyo, Tokyo 113-8656, Japan

Published
Vol 21 No 2, Mar 31, 2017
How to Cite
P. Chantharawong, A. Wongrueng, P. Rakruam, S. Wattanachira, and S. Takizawa, “Effects of Activated Carbon and Cationic Exchange Resin Pretreatments on Groundwater Defluoridation by Reverse Osmosis Process”, Engineering Journal (Eng. J.), vol. 21, no. 2, pp. 123-132, Mar. 2017.

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