Research Article Characterization of Natural Organic Matter in Conventional Water Treatment Processes and Evaluation of THM Formation with Chlorine

which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. This study investigates the fractions of natural organic matter (NOM) and trihalomethane (THM) formation after chlorination in samples of raw water and the outputs from ozonation, coagulation-flocculation, and conventional filtration treatment units. All the water samples are passed through various ultrafiltration (UF) membranes. UF membranes with different molecular size ranges based on apparent molecular weight (AMW), such as 1000, 3000, 10,000, and 30,000 Daltons (Da), are commonly used.The NOM fraction with AMW < 1000Da (1 K) is the dominant fraction within all the fractionated water samples. Its maximum percentage is 85.86 % after the filtration process and the minimum percentage is 65.01 % in raw water samples. The total THM (TTHM) yield coefficients range from 22.5 to 4