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Main Title Fate of water soluble azo dyes in the activated sludge process /
Author Shaul, Glenn M. ; Dempsey, C. R. ; Dostal, K. A.
Other Authors
Author Title of a Work
Dempsey, Clyde R.
Dostal, Kenneth A.
CORP Author Environmental Protection Agency, Cincinnati, OH. Water Engineering Research Lab.
Publisher U.S. Environmental Protection Agency, Water Engineering Research Laboratory,
Year Published 1988
Report Number EPA/600/2-88/030
Stock Number PB88-208251
Subjects Azo dyes--Toxicology ; Hazardous wastes
Additional Subjects Azo dyes ; Activated sludge process ; Dyes ; Carcinogens ; Concentration(Composition) ; Waste treatment ; Environmental fate ; Environment effects ; Biological industrial waste treatment
Library Call Number Additional Info Location Last
NTIS  PB88-208251 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 86 pages : illustrations ; 28 cm
The objective of the study was to determine the partitioning of water soluble azo dyes in the activated sludge process. Azo dyes are of concern because some of the dyes, dye precurors, and/or their degradation products such as aromatic amines (which are also dye precurors), have been shown to be, or are suspected to be, carcinogenic. Specific azo dyes were spiked at 1 and 5 mg/L to pilot-scale treatment systems with both liquid and sludge samples collected. Samples were analyzed by high performance liquid chromatography with ultraviolet-visible detector. Mass balance calculations were made to determine the percentage of the dye compound in the waste activated sludge and in the activated sludge effluent. Of the 18 dyes studied, 11 compounds were found to pass through the activated sludge process substantially untreated, 4 were significantly adsorbed onto the waste activated sludge and 3 were apparently biodegraded.