Record Display for the EPA National Library Catalog


Main Title Fate of Water Soluble Azo Dyes in the Activated Sludge Process.
Author Shaul, G. M. ; Dempsey, C. R. ; Dostal, K. A. ; Holdsworth, T. J. ;
CORP Author Environmental Protection Agency, Cincinnati, OH. Risk Reduction Engineering Lab.
Publisher c1991
Year Published 1991
Report Number EPA/600/J-91/194;
Stock Number PB91-240507
Additional Subjects Azo dyes ; Sulfonic acids ; Activated sludge process ; Separation ; Adsorption ; Biodeterioration ; Carcinogens ; Effluents ; Reprints ; Mass balance calculations
Library Call Number Additional Info Location Last
NTIS  PB91-240507 Some EPA libraries have a fiche copy filed under the call number shown. 07/26/2022
Collation 15p
The objective of the study was to determine the partitioning of water soluble azo dyes in the activated sludge process (ASP). Azo dyes are of concern because some of the dyes, dye precursors, and/or their degradation products such as aromatic amines (which are also dye precursors) 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 (HPLC) with an ultraviolet-visible detector. Mass balance calculations were made to determine the amount of the dye compound in the waste activated sludge (WAS) and in the activated sludge effluent (ASE). Of the 18 dyes studied, 11 compounds were found to pass through the ASP substantially untreated, 4 were significantly adsorbed onto the WAS, and 3 were apparently biodegraded.