The impact of water quality parameters such as organic and inorganic matter as well as chlorine species (free chlorine and monochloramine) on the rate of dechlorination by sodium bisulfite (SBS), sodium thiosulfate (STS) and ascorbic acid (AA) were studied. Reaction rate constants determined for the various dechlorination reactions showed that SBS and AA achieved dechlorination at a faster rate than STS. Organic matter present in the test solution increased the rate of dechlorination by STS but not SBS and AA. AA was found to be ineffective for the removal of monochloramine. The effect of dechlorination chemicals on water quality with respect to pH, turbidity and total organic carbon (TOC) was investigated along with the acute toxicity of the chemicals on the aquatic indicator species Daphnia magna. SBS was determined to have an LC50 of 68 mg/L with no toxicity impacts observed when the concentration was ≤ 20 mg/L for D. magna. AA increased the TOC levels in the treated water and resulted in some D. magna mortality at higher levels. STS had the least impact on daphnia mortality rates, but the use of STS for dechlorination resulted in the largest pH change of test waters compared to the other dechlorination chemicals.
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May 2011
This article was originally published in
Journal of Water Supply: Research and Technology-Aqua
Article Contents
Research Article|
May 01 2011
Comparison of dechlorination rates and water quality impacts for sodium bisulfite, sodium thiosulfate and ascorbic acid
Onita D. Basu;
1Dept of Civil and Environmental Engineering, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada
E-mail: [email protected]
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Nigel P. De Souza
Nigel P. De Souza
1Dept of Civil and Environmental Engineering, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada
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Journal of Water Supply: Research and Technology-Aqua (2011) 60 (3): 167–177.
Article history
Received:
July 28 2010
Accepted:
October 01 2010
Citation
Onita D. Basu, Nigel P. De Souza; Comparison of dechlorination rates and water quality impacts for sodium bisulfite, sodium thiosulfate and ascorbic acid. Journal of Water Supply: Research and Technology-Aqua 1 May 2011; 60 (3): 167–177. doi: https://doi.org/10.2166/aqua.2011.040
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