In the present study, concentrations of E1, E2, EE2, and T were variable, however, ranging from 0.97 to 117 ng L1, which likely reflected the variable composition of sewage influent during the study period. Nevertheless, E1, E2, and T levels were significantly higher in STS effluents than ATS and MTP effluent discharges (p < 0.05; Fig. 4), and observation that
was generally consistent with observations for Tiers I and II water quality indicators.