ABSTRACT
This chapter provides the understanding of the effectiveness of the AGS process in removing faecal indicator organisms compared to the CAS. Pathogens enter the aquatic environment through municipal wastewater discharges; their occurrence in either treated or raw wastewater may contribute to spreading epidemiological water-borne diseases. The compared to parallel activated sludge (CAS) systems operate in a continuous flow mode, and were designed to remove organic matter (C) and nutrients (N and P). Water temperature and dissolved oxygen concentrations were collected directly from the wastewater treatment plants (WWTPs) at the same time the samples were taken. Data is presented in Box-Whisker plots in which the horizontal line across each box represents the median, the interquartile ranges and the outliers represent the confident limit of 95% of the determined concentrations. The mean concentrations of the target organisms in the treated effluent of the different processes (AGS and CAS) were not significantly different for the two studied WWTPs.
