摘要：Since discovery of harmful disinfection by products (DBPs) like trihalomethanes (THMs) and haloacetic acids (HAAs) in chlorinated waters the removal of organic DBPs precursors gained priority in drinking water treatment. Historically, coagulation process was arranged to remove turbidity, typically related to pathogens occurrence, but nowadays it is usually optimized/enhanced for total organic carbon (TOC) reduction. This work dealt with the removal of TOC and turbidity by means of enhanced coagulation process using Al2(SO4)3⋅18 H2O and FeCl3⋅6H2O as coagulants for jar test without pH adjustment according to USEPA procedure. 15% of TOC removal required by USEPA D/DBPs rule (1998) was achieved using 30-50 mg l-1 of both coagulants. On the other hand, for compliance with more stringent MCL for total THMs in Italy (30 μg l-1) higher TOC removal (>30%) which needed of higher coagulants doses (80 mg l-1), was obviously required. Those high coagulant doses were also to be used for the compliance with the turbidity standard (<1NTU).
关键词：enhanced coagulation; pathogens control; TOC and turbidity removal; TTHMFP
