The objective of this study was to investigate the formation of trichloronitromethane (TCNM) from threonine precursors in the process of combined UV and chlorine disinfection. The effects of pH, threonine initial concentration, free chlorine concentration, light intensity and the addition of tertbutanol (TBA) on the formation of TCNM were investigated under UV/chlorine condition. UV/chlorine disinfection could enhance the formation of TCNM during chlorination of threonine and reached the maximum value within five minutes, then the concentration of TCNM began to decrease gradually due to the photodegradation of TCNM. Under UV/chlorine condition, the formation of TCNM from threonine increased with the increase of pH value, UV light intensity, threonine initial concentration, and free chlorine concentration. As TBA has little effect on formation of TCNM from threonine, so hydroxyl radical does not play a most important role in TCNM formation under UV/chlorine condition. The results of this study could be very useful for controlling HNMs formation and contribute to the development of new disinfection method for the drinking water.
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