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Influence of drinking water treatments on chlorine dioxide consumption and chlorite/chlorate formation.
Water Res. 2014 May 01; 54:44-52.WR

Abstract

Disinfection is the last treatment stage of a Drinking Water Treatment Plant (DWTP) and is carried out to maintain a residual concentration of disinfectant in the water distribution system. Chlorine dioxide (ClO2) is a widely used chemical employed for this purpose. The aim of this work was to evaluate the influence of several treatments on chlorine dioxide consumption and on chlorite and chlorate formation in the final oxidation/disinfection stage. A number of tests was performed at laboratory scale employing water samples collected from the DWTP of Cremona (Italy). The following processes were studied: oxidation with potassium permanganate, chlorine dioxide and sodium hypochlorite, coagulation/flocculation with ferric chloride and aluminum sulfate, filtration and adsorption onto activated carbon. The results showed that the chlorine dioxide demand is high if sodium hypochlorite or potassium permanganate are employed in pre-oxidation. On the other hand, chlorine dioxide leads to the highest production of chlorite and chlorate. The coagulation/flocculation process after pre-oxidation shows that chlorine dioxide demand decreases if potassium permanganate is employed as an oxidant, both with ferric chloride and aluminum sulfate. Therefore, the combination of these processes leads to a lower production of chlorite and chlorate. Aluminum sulfate is preferable in terms of the chlorine dioxide demand reduction and minimization of the chlorite and chlorate formation. Activated carbon is the most effective solution as it reduced the chlorine dioxide consumption by about 50% and the DBP formation by about 20-40%.

Authors+Show Affiliations

University of Brescia, Department of Civil Engineering, Architecture, Land, Environment and Mathematics, via Branze 43, 25123 Brescia, Italy. Electronic address: sabrina.sorlini@unibs.it.University of Brescia, Department of Civil Engineering, Architecture, Land, Environment and Mathematics, via Branze 43, 25123 Brescia, Italy.University of Brescia, Department of Civil Engineering, Architecture, Land, Environment and Mathematics, via Branze 43, 25123 Brescia, Italy.University of Brescia, Department of Civil Engineering, Architecture, Land, Environment and Mathematics, via Branze 43, 25123 Brescia, Italy.

Pub Type(s)

Journal Article

Language

eng

PubMed ID

24534637

Citation

Sorlini, Sabrina, et al. "Influence of Drinking Water Treatments On Chlorine Dioxide Consumption and Chlorite/chlorate Formation." Water Research, vol. 54, 2014, pp. 44-52.
Sorlini S, Gialdini F, Biasibetti M, et al. Influence of drinking water treatments on chlorine dioxide consumption and chlorite/chlorate formation. Water Res. 2014;54:44-52.
Sorlini, S., Gialdini, F., Biasibetti, M., & Collivignarelli, C. (2014). Influence of drinking water treatments on chlorine dioxide consumption and chlorite/chlorate formation. Water Research, 54, 44-52. https://doi.org/10.1016/j.watres.2014.01.038
Sorlini S, et al. Influence of Drinking Water Treatments On Chlorine Dioxide Consumption and Chlorite/chlorate Formation. Water Res. 2014 May 1;54:44-52. PubMed PMID: 24534637.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Influence of drinking water treatments on chlorine dioxide consumption and chlorite/chlorate formation. AU - Sorlini,Sabrina, AU - Gialdini,Francesca, AU - Biasibetti,Michela, AU - Collivignarelli,Carlo, Y1 - 2014/01/31/ PY - 2013/09/02/received PY - 2014/01/17/revised PY - 2014/01/20/accepted PY - 2014/2/19/entrez PY - 2014/2/19/pubmed PY - 2014/11/5/medline KW - Chlorate KW - Chlorine dioxide demand KW - Chlorite KW - Drinking water treatment plant SP - 44 EP - 52 JF - Water research JO - Water Res VL - 54 N2 - Disinfection is the last treatment stage of a Drinking Water Treatment Plant (DWTP) and is carried out to maintain a residual concentration of disinfectant in the water distribution system. Chlorine dioxide (ClO2) is a widely used chemical employed for this purpose. The aim of this work was to evaluate the influence of several treatments on chlorine dioxide consumption and on chlorite and chlorate formation in the final oxidation/disinfection stage. A number of tests was performed at laboratory scale employing water samples collected from the DWTP of Cremona (Italy). The following processes were studied: oxidation with potassium permanganate, chlorine dioxide and sodium hypochlorite, coagulation/flocculation with ferric chloride and aluminum sulfate, filtration and adsorption onto activated carbon. The results showed that the chlorine dioxide demand is high if sodium hypochlorite or potassium permanganate are employed in pre-oxidation. On the other hand, chlorine dioxide leads to the highest production of chlorite and chlorate. The coagulation/flocculation process after pre-oxidation shows that chlorine dioxide demand decreases if potassium permanganate is employed as an oxidant, both with ferric chloride and aluminum sulfate. Therefore, the combination of these processes leads to a lower production of chlorite and chlorate. Aluminum sulfate is preferable in terms of the chlorine dioxide demand reduction and minimization of the chlorite and chlorate formation. Activated carbon is the most effective solution as it reduced the chlorine dioxide consumption by about 50% and the DBP formation by about 20-40%. SN - 1879-2448 UR - https://www.unboundmedicine.com/medline/citation/24534637/Influence_of_drinking_water_treatments_on_chlorine_dioxide_consumption_and_chlorite/chlorate_formation_ DB - PRIME DP - Unbound Medicine ER -