The hospital effluent was first continuously treated in the coagulation-flocculationpilot plant at three different conditions: (i)without external additions (blank); (ii) using 25 mg L1 ofAl2(SO4)3 as coagulant; and (iii) in the presence of 25 mg L1 ofFeCl3. The selection of these operational conditions was based onthe results obtained during batch experiments, which indicatedthat working at the higher coagulant dose of 50 mg L1 did not leadR
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