LEVELS AND EFFECTIVE FACTORS ON HALOACETIC ACIDS FORMATION IN DRINKING WATER

Disinfection byproducts (DBPs) in drinking water are important due to the probable risks they pose to human health. In this study, drinking water samples were collected from 11 points from water transmission lines to the distribution system as well as district municipal demineralization plant (DMDP) for the first time in Bushehr from October 2015 to May 2016 for haloacetic acids (HAA5) analysis by using a GC-ECD. The effects of pH, temperature, chlorine dosage, UV-254, TOC, SUVA, different water sources, seasonal and spatial variations were evaluated and the concentration level of HAA5 was compared with drinking water guideline. The results revealed that the monochloroacetic acid and monobromoacetic acid were the major haloacetic acids found in all water samples, which accounted for 42.65 and 47.03% of HAA5, respectively. HAA5 concentration levels in almost 40.9% of the samples were higher than the maximum contaminant level (MCL) contents set by Environmental Protection Agency (EPA). Significant correlation was observed between monobromoacetic acid concentration level with pH and temperature, as well as dichloroacetic acid concentration level with UV-254.