ABSTRACT
This chapter describes work that used wastewater from the Greater Cincinnati Mill Creek Sewage Treatment Plant as the influent to some pilot-scale activated sludge process (ASP) systems. Environmental Protection Agency's Water Engineering Research Laboratory, Office of Research and Development has an ongoing study to determine the fate of specific azo dye compounds in the ASP. The objective of the study is to dose pilot plant ASP systems with various azo dyes and monitor each dye compound through the system, analyzing both liquid and sludge samples. If the ASP data fall on or near the calculated line of best fit from the isotherm, then one could conclude that the isotherm provided a good estimate of the dye removal due to adsorption in the ASP studies. Once the additional data are available, relationships between physical and chemical properties and the fate of the compounds will be investigated.
