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

Praphasiri Chantharawong; Aunnop Wongrueng; Pharkphum Rakruam; Suraphong Wattanachira; Satoshi Takizawa

doi:10.4186/ej.2017.21.2.123

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

Authors

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

DOI:

https://doi.org/10.4186/ej.2017.21.2.123

Keywords:

Fluoride, permeate flux, reverse osmosis, membrane fouling.

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

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

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

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

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Published In

Vol 21 No 2, Mar 31, 2017

How to Cite

[1]

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”, Eng. J., vol. 21, no. 2, pp. 123-132, Mar. 2017.

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