Toxicant Reduction in the Dunny Way CSOby Patrick Romberg, Municipality of Metropolitan, Seattle, Seattle, WA, USA,
Denise Healy, Municipality of Metropolitan, Seattle, Seattle, WA, USA,
Keith Lund, Municipality of Metropolitan, Seattle, Seattle, WA, USA,
Abstract: Combined sewer overflows (CSO) are a source of pollution to receiving waters and need to be controlled. As an interim approach to improving environmental conditions at this site in Seattle, a trial study was conducted to see if the level of toxic chemicals in the discharge could be reduced by locating and eliminating toxicant sources upstream in the sewer system. While over 500 commercial businesses were considered as potential toxicant sources, the study results showed that relatively few of these discharged heavy metals. Industrial laundries were the most predominent source due to their large discharge volumes. Besides controlling commercial sources, there may be a few changes in the collection system itself which could reduce the toxicant loading discharged at this CSO site.
Subject Headings: Toxicity | Combined sewers | Water pollution | Environmental issues | Heavy metals | Overflow | Water discharge | Washington | North America | United States | Seattle
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