Bench-scale Cryptosporidium inactivation, pilot-scale disinfection by-product (DBP) formation and bench-scale inorganic DBP control experiments were conducted to evaluate the effectiveness of chlorine dioxide in meeting the current and future enhanced surface water treatment and disinfectant/disinfection by-product rules. A new chlorine dioxide generation process in which dilute, humidified chlorine gas is in contact with solid sodium chlorite was employed for this study. Chlorine dioxide was found to be effective in achieving CT values (pH=8 and temperature=20°C) of approximately 50 and 100 mg · min/l for 1-log and 2-log Cryptosporidium inactivation, respectively. Chlorine dioxide did not form significant amounts of trihalomethanes or haloacetic acids. Water spiked with high bromide concentrations resulted in insignificant amounts of organic DBPs after reaction with chlorine dioxide. Reaction of chlorine dioxide with water constituents resulted in the formation of chlorite and chlorate ions. Addition of ferrous ion is an effective treatment strategy for chlorite ion control.
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June 01 2001
Effectiveness of chlorine dioxide in meeting the enhanced surface water treatment and disinfection by-products rules
Harish Arora
;
1
American Water Works Service Company Inc., 1025 Laurel Oak Road, Voorhees, NJ 080843, USA
Tel: +(856) 346 8272 Fax: +(856) 782 3603; E-mail: harora@amwater.com
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Mark LeChevallier
;
Mark LeChevallier
1
American Water Works Service Company Inc., 1025 Laurel Oak Road, Voorhees, NJ 080843, USA
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David Battigelli
David Battigelli
2
Wisconsin State Laboratory of Hygiene, 2601 Agricultural Drive, Madison, WI 53718 USA
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Journal of Water Supply: Research and Technology-Aqua (2001) 50 (4): 209-227.
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Harish Arora, Mark LeChevallier, David Battigelli; Effectiveness of chlorine dioxide in meeting the enhanced surface water treatment and disinfection by-products rules. Journal of Water Supply: Research and Technology-Aqua 1 June 2001; 50 (4): 209–227. doi: https://doi.org/10.2166/aqua.2001.0019
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Harish Arora, Mark LeChevallier, David Battigelli; Effectiveness of chlorine dioxide in meeting the enhanced surface water treatment and disinfection by-products rules. Journal of Water Supply: Research and Technology-Aqua 1 June 2001; 50 (4): 209–227. doi: https://doi.org/10.2166/aqua.2001.0019
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