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Combining dissolved organic matter (DOM) in raw water (RW) with DOM in treated wastewater (TWW) can react with chlorine and pose emerging disinfection by-products (DBPs). This study evaluated DOM based on the molecular weight (MW) size fractionation, trihalomethane, iodinated-trihalomethane, haloacetonitrile, and trichloronitromethane formation potential (THMFP, I-THMFP, HANFP, and TCNMFP) of the RW from the U-Tapao Canal, Songkhla, Thailand and the RW mixed with TWW (RW + TWW) samples. The RW and RW + TWW were treated by coagulation with poly aluminum chloride. The DOM of RW and RW + TWW and their treated water was distributed most in the MW below 1 kDa. The MWs of 3–10 kDa and 1–3 kDa were the active DOM involved in the specific THMFP for the RW + TWW. The MW of &lt; 1 kDa in the RW + TWW resulted in a slightly high specific I-THMFP and HANFP. The MW of 1 − 3 kDa in the coagulated samples had a high specific I-THMFP. The MW of &gt; 10 kDa in the coagulated RW + TWW was a precursor for a particular HANFP. Monitoring systems for measuring the level of TWW mixed with RW and an effective process to enhance the efficiency of traditional water treatment must be set up to produce a consumer-safe water supply.

Emerging disinfection by-products formation of various molecular weight organic matter fractions in raw water contaminated with treated wastewater