Pesticide removals in the nitrifying expanded-bed filter at drinking water treatment plant

  • Nguyet Thi-Minh Dao Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu City, Fukuoka, Japan
  • The-Anh Nguyen Faculty of Water Resources Engineering, Thuy Loi University, 175 Tay Son street, Dong Da district, Hanoi, Vietnam
  • Viet-Anh Nguyen Institute of Environmental Science and Engineering, National University of Civil Engineering, 55 Giai Phong road, Hai Ba Trung district, Hanoi, Vietnam
  • Mitsuharu Terashima Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu City, Fukuoka, Japan
  • Hidenari Yasui Faculty of Environmental Engineering, The University of Kitakyushu, 1-1 Hibikino, Wakamatsu, Kitakyushu City, Fukuoka, Japan

Abstract

The occurrence of pesticides even at low concentrations in drinking water sources might induce potential risks to public health. This study aimed to investigate the removal mechanisms of eight pesticides by the nitrifying expanded-bed filter using biological activated carbon media at the pretreatment of a drinking water plant. The field analysis demonstrated that four pesticides Flutolanil, Buprofezin, Chlorpyrifos, and Fenobucard, were removed at 82%, 55%, 54%, and 52% respectively, while others were not significantly removed. Under controlled laboratory conditions with continuous and batch experiments, the adsorption onto the biological activated carbon media was demonstrated to be the main removal pathway of the pesticides. The contribution of microorganisms to the pesticide removals was rather limited. The pesticide removals observed in the field reactor was speculated to be the adsorption on the suspended solids presented in the influent water. The obtained results highlighted the need to apply a more efficient and cost-effective technology to remove the pesticide in the drinking water treatment process.

Keywords:

biological activated carbon; drinking water treatment; nitrifying expanded-bed filter; pesticide removal.

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Published
14-12-2020
How to Cite
Dao, N. T.-M., Nguyen, T.-A., Nguyen, V.-A., Terashima, M., & Yasui, H. (2020). Pesticide removals in the nitrifying expanded-bed filter at drinking water treatment plant. Journal of Science and Technology in Civil Engineering (STCE) - NUCE, 15(1), 1-13. https://doi.org/10.31814/stce.nuce2021-15(1)-01
Section
Research Papers