Comparison of dechlorination rates and water quality impacts for sodium bisulfite, sodium thiosulfate and ascorbic acid

Research Article| May 01 2011 Comparison of dechlorination rates and water quality impacts for sodium bisulfite, sodium thiosulfate and ascorbic acid Onita D. Basu; Onita D. Basu 1Dept of Civil and Environmental Engineering, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada E-mail: onita_basu@carleton.ca Search for other works by this author on: This Site PubMed Google Scholar Nigel P. De Souza Nigel P. De Souza 1Dept of Civil and Environmental Engineering, 1125 Colonel By Drive, Ottawa, ON, K1S 5B6, Canada Search for other works by this author on: This Site PubMed Google Scholar Journal of Water Supply: Research and Technology-Aqua (2011) 60 (3): 167–177. https://doi.org/10.2166/aqua.2011.040 Article history Received: July 28 2010 Accepted: October 01 2010 Views Icon Views Article contents Figures & tables Video Audio Supplementary Data Share Icon Share Facebook Twitter LinkedIn MailTo Tools Icon Tools Cite Icon Cite Permissions Search Site Search Dropdown Menu toolbar search search input Search input auto suggest filter your search All ContentAll JournalsThis Journal Search Advanced Search 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 Download citation file: Ris (Zotero) Reference Manager EasyBib Bookends Mendeley Papers EndNote RefWorks BibTex 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. acute toxicity, ascorbic acid, Daphnia magna, sodium bisulfite, sodium thiosulfate, water dechlorination This content is only available as a PDF. © IWA Publishing 2011 You do not currently have access to this content.