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1 May 2019
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article| April 05 2019
Jana Naceradska;
Jana Naceradska
1Institute of Hydrodynamics of the Czech Academy of Sciences, Pod Patankou 5, 166 12 Prague 6, Czech Republic
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Lenka Pivokonska;
Lenka Pivokonska
1Institute of Hydrodynamics of the Czech Academy of Sciences, Pod Patankou 5, 166 12 Prague 6, Czech Republic
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Martin Pivokonsky
1Institute of Hydrodynamics of the Czech Academy of Sciences, Pod Patankou 5, 166 12 Prague 6, Czech Republic
E-mail: pivo@ih.cas.cz
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Journal of Water Supply: Research and Technology-Aqua (2019) 68 (3): 222–230.
Article history
Received:
November 27 2018
Accepted:
March 12 2019
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Citation
Jana Naceradska, Lenka Pivokonska, Martin Pivokonsky; On the importance of pH value in coagulation. Journal of Water Supply: Research and Technology-Aqua 1 May 2019; 68 (3): 222–230. doi: https://doi.org/10.2166/aqua.2019.155
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Abstract
Many studies have overlooked the role of pH in optimizing coagulation. Herein, the authors emphasize the importance of pH value in coagulation during the production of drinking water. We investigate the influence of pH value on the surface charges and forms of coagulants and impurities intended for removal. A methodology is suggested for optimizing key parameters for efficient coagulation – coagulant dosage and pH value. The study points out that various optimal pH ranges are required for coagulation of specific impurities and their mixtures. For natural organic matter of both humic and algogenic origin, acidic pH values are favourable for their removal through charge neutralization mechanism. Algal cells are effectively coagulated at slightly acidic to neutral pH values due to interactions with coagulant hydroxide precipitates. Inorganic particles are eliminated preferably at around neutral pH values. When mixtures of impurities are coagulated, mutual interaction between the impurities may impact dose of coagulant and also optimal pH ranges.
coagulant dosage, coagulation, jar test, pH optimization
© IWA Publishing 2019
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