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Aquatic organic matters refer to chemical compounds that result from natural processes in the environmental including algae metabolic reactions and decomposition of organic matter. The removal of NOM is the most effective effort to minimize the generation of disinfection by-products (DBPs). Aims of this research are to compare various treatments in controlling aquatic organic matters, which caused the formation of the carcinogenic compound. Combination processes of pre-chlorination, coagulation with alum and FeCl3 and adsorption with powdered activated carbon (PAC) was applied under different dosage. TOC and UV254 were measured to quantify organic matters, Fourier Transform Infrared (FTIR) was applied to identify organics properties, and CHCl3 was measured to know carcinogenic concentration. The results showed that pre-chlorination only caused the formation of lower molecular weight, pre-chlorination followed by coagulation combined with adsorption showed a better result than coagulation-adsorption only. FeCl3 coagulant is more effective than alum. Aromatic compounds are a precursor for the formation of CHCl3, since removal UV254 along with CHCl3 concentration.

PERFORMANCE OF PRE-CHLORINATION, COAGULATION AND ADSORPTION FOR CONTROLLING THE FORMATION OF CARCINOGENIC COMPOUND IN TREATED WATER