“…Up to now, most studies on antibiotics in WWTPs focused on the concentration levels of certain antibiotics such as sulfamethoxazole, tetracycline and ciprofloxacin in influent, effluent and sludge (Batt et al, 2006b;Gao et al, 2012;Watkinson et al, 2007;Xu et al, 2007). Several recent studies reported the degradation of some antibiotics in activated sludge systems in laboratory conditions (Kim et al, 2005;Li and Zhang, 2010;Suarez et al, 2010).…”