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The objective of this research was to determine the impact of ultraviolet (UV) treatmentcombined with chlorination/chloramination on natural organic matter (NOM) reactivity and theformation of regulated and unregulated disinfection byproducts (DBPs). Previous research hasdemonstrated that DBP precursors are contained within the different polarity groups of NOM(Kitis et al., 2002; Liang et al., 2003). Laboratory-controlled studies were performed usingNOM concentrated from a full-scale surface water treatment plant by reverse osmosis (RO) andfractionated on XAD resins according to polarity and acid/base/neutral properties. Differencesin DBP formation were investigated through various combinations of UV, chlorination, andchloramination treatments in the presence/absence of nitrate and bromide among the NOMfractions and these differences compared to those produced with the same treatments on theoriginal RO concentrate. With the addition of medium pressure UV irradiation prior tochlorination of the RO concentrate, the chlorine demand increased by 35% and the concentrationof chloroform doubled. Trichloronitromethane and dimethylnitramine formation increased as aresult of medium pressure UV followed by chlorination or chloramination whilenitrosodimethylamine formation increased as a result of medium pressure UV followed only bychlorination. The use of concentrated fractions also permitted observations of trends in theformation of nitrogen-containing byproducts that are often below detection in disinfected naturalwaters. UV effects on DBP formation were confirmed with Suwannee River natural organicmatter. Includes 10 references, tables, figures.

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Edition: Vol. - No. Published: 11/01/2009 Number of Pages: 7File Size: 1 file , 790 KB