Author: Calmer John Karkal Sandeep Laniohan Dennis Johnson Mary Ann
Publisher: Water Environment Federation
ISSN: 1938-6478
Source: Proceedings of the Water Environment Federation, Vol.2002, Iss.14, 2002-01, pp. : 545-555
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Abstract
“Conventional wisdom” has held that dechlorination with sulfites is “complete” and “instantaneous” upon mixing of the dechlorinating agent with typical municipal wastewater treatment plant effluents. Further, it is generally believed that sulfite residuals are stable and not subject to degradation once added to the effluent. Delta Diablo Sanitation District in Antioch, CA, experienced conditions in its dechlorination sampling system in which these widely-held beliefs were found to not hold true. After studying the unusual conditions at the District, the study team came to the following conclusions as applied their special case:
The paper documents that very low concentrations of “slowly dechlorinated” chlorine residuals may be present in the effluent. Problems with conventional analysis techniques are identified, and modified analysis techniques are described to allow for more complete evaluation of dechlorination process performance. Toxicity implications of these findings are also briefly addressed.
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