We investigated the effect of coagulant basicity on bacteriophage removal from river water by polyferric chloride (PFC). PFC at three basicities (basicity 0.9–2.1) was prepared by means of base titration (NaOH was added to ferric chloride (FeCl3) solution) and the virus removal efficiencies of those PFCs were compared with that of FeCl3 (basicity 0). The virus removal efficiencies of the PFCs were equal to or less than that of FeCl3 at both pH 6 and pH 8. This suggests that, unlike aluminum-based coagulants, increasing the basicity of iron-based coagulants does not improve virus removal efficiency. Furthermore, the relative abundance of monomeric iron(III) species in the PFCs decreased, whereas that of precipitated iron(III) species increased with increasing basicity, as assessed with a ferron method. Colloid charge density also decreased with increasing basicity. Therefore, it is likely that the reduction in the abundance of monomeric iron(III) species led to the reduction in colloid charge density, which then reduced virus removal efficiency. Thus, the development of novel iron-based coagulants with increased virus removal efficiency may not be possible by simply increasing the basicity of the coagulant.
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2 June 2016
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article|
January 29 2016
Effect of coagulant basicity on virus removal from water by polyferric chloride
Nobutaka Shirasaki;
1Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
E-mail: [email protected]
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Taku Matsushita;
Taku Matsushita
1Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
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Yoshihiko Matsui;
Yoshihiko Matsui
1Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
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Takuya Marubayashi
Takuya Marubayashi
1Division of Environmental Engineering, Faculty of Engineering, Hokkaido University, N13W8, Sapporo 060-8628, Japan
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Journal of Water Supply: Research and Technology-Aqua (2016) 65 (4): 322–329.
Article history
Received:
September 14 2015
Accepted:
December 19 2015
Citation
Nobutaka Shirasaki, Taku Matsushita, Yoshihiko Matsui, Takuya Marubayashi; Effect of coagulant basicity on virus removal from water by polyferric chloride. Journal of Water Supply: Research and Technology-Aqua 2 June 2016; 65 (4): 322–329. doi: https://doi.org/10.2166/aqua.2016.104
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