Title page for ETD etd-08142001-093734


Type of Document Master's Thesis
Author Harris, Charissa Larine
Author's Email Address chharris@vt.edu
URN etd-08142001-093734
Title The Effect of Predisinfection with Chlorine Dioxide on the Formation of Haloacetic Acids and Trihalomethanes in a Drinking Water Supply
Degree Master of Engineering
Department Environmental Engineering
Advisory Committee
Advisor Name Title
Dietrich, Andrea M. Committee Co-Chair
Hoehn, Robert C. Committee Co-Chair
Gallagher, Daniel L. Committee Member
Keywords
  • chlorine dioxide
  • disinfection byproducts
  • haloacetic acids
  • trihalomethanes
Date of Defense 2001-07-27
Availability unrestricted
Abstract
In an effort to maintain compliance with current and future United States Environmental Protection Agency regulations governing haloacetic acids (HAAs) and trihalomethanes (THMs), the Blacksburg, Christiansburg, VPI (BCVPI) Water Authority in Radford, Virginia elected to eliminate prechlorination and replace it with preoxidation using chlorine dioxide (ClO2). Prior to full-scale application at the BCVPI Water Treatment Plant, jar testing was done to determine the effects of ClO2 on the formation of HAAs and THMs.

Jar testing results showed a significant reduction in THM formation potential when 2.0 mg/L ClO2 was applied to raw water and chlorination was delayed. Chlorine dioxide doses less than 2.0 mg/L were statistically insignificant in the reduction of THM formation potentials below samples that were prechlorinated according to the BCVPI Water Treatment Plant's current practice. Likewise, ClO2 did not alter HAA formation potentials in such a way that statistical differences could be detected between ClO2 pretreatment and prechlorination, even at a dose of 2.0 mg/L ClO2.

The two inorganic byproducts of ClO2, chlorite and chlorate, were also measured following jar tests. Chlorite concentrations increased with an increased ClO2 dose, but remained below 1.0 mg/L. Chlorate was formed in all jar-test samples.

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