NOM is known as precursors to produce disinfection by-products such as THMs and HAAs in drinking water
treatment. In this study, NOM removal and THMs reduction were investigated by comparing the conventional
and enhanced coagulation through jar-test. Additionally the efficiency of the coagulation was studied on
activated carbon adsorption using adsorption isotherms for natural waters. The experimental data were
simulated with IAST to investigate adsorbability of the NOM adsorption as multi-components isotherms. The
results showed that enhanced coagulation could reduce 10 to 30% more of DOC and 5 to 20% more of
THMs than those of conventional coagulation, respectively. The order of adsorption capacity on activated
carbon showed that the enhanced coagulation had the highest capacity, the conventional coagulation and
raw water. The order of adsorption capacity can be explained by increase of strong adsorbable fraction and
decreasing initial DOC concentration by enhanced coagulation.