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Detoxification of Chlorinated Sewage Effluent by Dechlorination in Estuarine Waters

Morris H. Roberts, Jr.
Estuaries
Vol. 3, No. 3 (Sep., 1980), pp. 184-191
Stable URL: http://www.jstor.org/stable/1352068
Page Count: 8
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Since scans are not currently available to screen readers, please contact JSTOR User Support for access. We'll provide a PDF copy for your screen reader.
Detoxification of Chlorinated Sewage Effluent by Dechlorination in Estuarine Waters
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Abstract

Secondary treated sewage was chlorinated to a residual level of 2-10 mg/l in a continuous flow system in the laboratory and diluted to various levels with estuarine water. A portion of the chlorinated sewage effluent was dechlorinated with sodium thiosulfate and the dechlorinated waste was diluted with estuarine water in the same proportions as the chlorinated waste. Menidia menidia, Palaemonetes pugio and Crassostrea virginica were exposed to chlorinated and dechlorinated treatments. High concentrations of chlorinated effluent caused mortalities in M. menidia and P. pugio, whereas similar concentrations of dechlorinated wastes did not cause mortalities. Mortalities in the chlorinated waste are correlated with chlorine residuals. Similarly, the chlorinated wastes depressed the shell deposition rate of C. virginica below 50% of controls at all doses. Dechlorinated waste allowed shell deposition greater than 50% of controls. However, the occurrence of some growth inhibition in C. virginica exposed to dechlorinated waste suggests the presence of toxic material in the waste other than chlorine.

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