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Removing arsenic from groundwater in Cambodia using high performance iron adsorbent

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Abstract

In Cambodia, groundwater has been contaminated with arsenic, and purification of the water is an urgent issue. From 2010 to 2012, an international collaborative project between Japan and Cambodia for developing arsenic-removing technology from well water was conducted and supported by the foundation of New Energy and Industrial Technology Development Organization, Japan. Quality of well water was surveyed in Kandal, Prey Veng, and Kampong Cham Provinces, and a monitoring trial of the arsenic removal equipment using our patented amorphous iron (hydr)oxide adsorbent was performed. Of the 37 wells surveyed, arsenic concentration of 24 exceeded the Cambodian guideline value (50 μg L−1), and those of 27 exceeded the WHO guideline for drinking water (10 μg L−1). Levels of arsenic were extremely high in some wells (>1,000–6,000 μg L−1), suggesting that arsenic pollution of groundwater is serious in these areas. Based on the survey results, 16 arsenic removal equipments were installed in six schools, three temples, two health centers, four private houses, and one commune office. Over 10 months of monitoring, the average arsenic concentrations of the treated water were between 0 and 10 μg L−1 at four locations, 10–50 μg L−1 at eight locations, and >50 μg L−1 at four locations. The arsenic removal rate ranged in 83.1–99.7 %, with an average of 93.8 %, indicating that the arsenic removal equipment greatly lower the risk of arsenic exposure to the residents. Results of the field trial showed that As concentration of the treated water could be reduced to <10 µg L−1 by managing the As removal equipment properly, suggesting that the amorphous iron (hydr)oxide adsorbent has high adsorbing capacity for As not only in the laboratory environment but also in the field condition. This is one of the succeeding As removal techniques that could reduce As concentration of water below the WHO guideline value for As in situ.

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Acknowledgments

We thank the New Energy and Industrial Technology Development Organization, Japan, for their financial support from June 2010 to February 2012. We would also like to thank the Ministry of Industry, Mines and Energy, Cambodia, and the Institute of Technology of Cambodia for their continued partnership during the project.

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Authors and Affiliations

  1. Faculty of Agriculture, Kochi University, Monobe Otsu 200, Nankoku City, Kochi, 783-8502, Japan

    Y. Kang, K. Nuki & K. Sakurai

  2. Aqua Design System Co., Ltd., Takasu 2-6-56-203, Kochi City, Kochi, Japan

    R. Takeda

  3. GREEN Co., Ltd., Setominamityou 1-6-5, Kochi City, Japan

    A. Nada

  4. Institute of Technology of Cambodia, P.O. Box. 86, Russian Federation Blvd., Phnom Penh, Cambodia

    L. Thavarith

  5. Department of Potable Water Supply, Ministry of Industry, Mines and Energy, 45 Preah Norodam Blvd., Phnom Penh, Cambodia

    S. Tang

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  1. Y. Kang
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  2. R. Takeda
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  3. A. Nada
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  4. L. Thavarith
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  5. S. Tang
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  6. K. Nuki
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  7. K. Sakurai
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Correspondence to Y. Kang.

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Kang, Y., Takeda, R., Nada, A. et al. Removing arsenic from groundwater in Cambodia using high performance iron adsorbent. Environ Monit Assess 186, 5605–5616 (2014). https://doi.org/10.1007/s10661-014-3806-6

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  • DOI: https://doi.org/10.1007/s10661-014-3806-6

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