Abbas H.Sulaymon - University of Baghdad, Engineering College, Environmental Engineering Department
Abdul-Fattah M.Ali
Saadi K.Al-Nasiry

Experimental measurements were conducted to determine the level of Natural organic matter (NOM) and its disinfection by-products formation potential (DBPFP) for Tigris River water in Baghdad. The results showed that raw water total organic carbon (TOC) levels have a potential to produce concentration of trihalomethane (THM) exceeding the USEPA guideling of 80 ??/l during most of the year. At TOC concentration of 2.2 mg/l GAC system showed a , relatively , low carbon usage rate of 43 mg GAC per liter water treated. Enhanced coagulation showed TOC removal efficiency of 18% and 23% with aluminum sulfate or ferric chloride respectively and without initial pH reduction. Removal efficiency increased to 22% and 24% when initially pH was reduced to 6.5 pretreatment with EC with a prior pH reduction to 6.5 had increased the GAC bed life by 59% .

Surface water , activates carbon , enhanced coagulation