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Main Title Effects of Wastewater Treatment and Seawater Dilution in Reducing Lethal Toxicity of Municipal Wastewater to Sheepshead Minnow ('Cyprinodon variegatus') and Pink Shrimp ('Penaeus duorarum').
Author Young, D. R. ; Baumgartner, D. J. ; Snedaker, S. C. ; Udey, L. ; Brown, M. S. ;
CORP Author Environmental Research Lab.-Narragansett, Newport, OR. Mark O. Hatfield Marine Science Center.
Publisher c1989
Year Published 1989
Report Number EPA/600/J-90/332 ;ERLN-N070;
Stock Number PB91-149781
Additional Subjects Marine biology ; Water pollution effects(Animals) ; Toxicity ; Wastewater treatment ; Seawater ; Mortality ; Environmental monitoring ; Chlorination ; Reprints ; Sheepshead minnow ; Pink shrimp ; Cyprinodon variegatus ; Panaeus duorarum
Library Call Number Additional Info Location Last
NTIS  PB91-149781 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 12p
The study was conducted to determine the effects of treatment and seawater dilution of municipal wastewater on marine organisms. An experimental facility was built in southeast Florida that provided both unchlorinated and chlorinated effluent from three standard treatments: primary settling, chemical flocculation, and activated sludge secondary treatment. Exposure tests lasting longer that one month were conducted on the sheepshead minnow (Cyprinodon variegatus) and the pink shrimp (Panaeus duorarum), with each of these six effluent types at seawater dilution ratios of 30:1 100:1, and 300:1. The shrimp showed a much more sensitive response than the minnow. Almost 100% mortality occurred for shrimp exposed to the unchlorinated 30:1 seawater dilutions of primary-settled wastewater, while mortality for the other two effluents were similar to controls. Mortality could not be attributed to any of the chemicals measured in the wastewater. For the 30:1 dilution experiments, chlorination usually resulted in much higher toxicity, increasing the dilution factor from 30:1 to 100:1 reduced the mortality observed (in both unchlorinated and chlorinated tests) essentially to control levels.