Activated carbon is used in many drinking water facilities because it can remove a broad spectrum of contaminants (e.g., herbicides, pesticides, heavy metals, etc.) or to replace anthracite coal in dual media filters. In recent years, liquid chlorine has been substituted by chlorine dioxide (ClO2) because, for instance, it can remove natural organic matter in raw water without formation of harmful disinfection by-products. Interest in chlorine dioxide is due to formation of chlorite (ClO−2), which can be potentially toxic for humans. In this study, the authors investigated the applicability of two activated carbons coming from different matrices (coconuts and bituminous) as technology for chlorite removal. The activated carbons were tested at different conditions (virgin and pre-loaded with some substances) in order to simulate full-scale working situations, and their Freundlich isotherms were determined. The results show a good affinity of virgin carbons in chlorite removal (about 80%), but the pre-loading significantly affected the efficiency of the chlorite removal process, reducing it to only 19%. An investigation into the main removal mechanism used by the carbons for chlorite removal was also done. Results show that activated carbons used both reduction and adsorption processes.
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June 2015
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article|
February 23 2015
Effectiveness in chlorite removal by two activated carbons under different working conditions: a laboratory study
Sabrina Sorlini;
1University of Brescia – DICATAM, via Branze, 43 - 25123 Brescia (BS), Italy
E-mail: [email protected]
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Maria Cristina Collivignarelli;
Maria Cristina Collivignarelli
1University of Brescia – DICATAM, via Branze, 43 - 25123 Brescia (BS), Italy
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Matteo Canato
Matteo Canato
1University of Brescia – DICATAM, via Branze, 43 - 25123 Brescia (BS), Italy
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Journal of Water Supply: Research and Technology-Aqua (2015) 64 (4): 450–461.
Article history
Received:
September 16 2014
Accepted:
January 15 2015
Citation
Sabrina Sorlini, Maria Cristina Collivignarelli, Matteo Canato; Effectiveness in chlorite removal by two activated carbons under different working conditions: a laboratory study. Journal of Water Supply: Research and Technology-Aqua 1 June 2015; 64 (4): 450–461. doi: https://doi.org/10.2166/aqua.2015.132
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