Skip to main content

Comparison of reaction kinetics under varying conditions for dechlorination chemicals

The full text article is not available for purchase.

The publisher only permits individual articles to be downloaded by subscribers.

or click here to sign up for a free trial


The rate of dechlorination using seven different chemicals was studied under a range of dosages, mixing intensities and pH conditions. This kinetic study demonstrates that sodium sulfite, sodium bisulfite, sodium metabisulfite, sodium thiosulfate, and ascorbic acid are needed in excess of the stoichiometric dosage (mg Dechlorination Agent/mg Cl2) to achieve complete dechlorination within less than 1 minute and that the dechlorination reactions were pseudo-first order in terms of the total chlorine concentration in solution. Calcium thiosulfate and hydrogen peroxide on the other hand displayed first order dechlorination kinetics with 1x and 0.1x stoichiometric dosage, respectively achieving complete dechlorination in ≤1 minute. Acute toxicity of the various dechlorination chemicals was completed to help determine which dechlorination agent is also safest for release into the aquatic environment. Hydrogen peroxide was found to have the highest dechlorination rate but was the most toxic compound with respect to Daphnia magna.

Document Type: Research Article


Publication date: January 1, 2008

More about this publication?
  • Proceedings of the Water Environment Federation is an archive of papers published in the proceedings of the annual Water Environment Federation® Technical Exhibition and Conference (WEFTEC® ) and specialty conferences held since the year 2000. These proceedings are not peer reviewed.

    WEF Members: Sign in (right panel) with your IngentaConnect user name and password to receive complimentary access.
  • Subscribe to this Title
  • Membership Information
  • About WEF Proceedings
  • WEFTEC Conference Information
  • Ingenta Connect is not responsible for the content or availability of external websites

Access Key

Free Content
Free content
New Content
New content
Open Access Content
Open access content
Subscribed Content
Subscribed content
Free Trial Content
Free trial content
Cookie Policy
Cookie Policy
Ingenta Connect website makes use of cookies so as to keep track of data that you have filled in. I am Happy with this Find out more