The objective of this research was to determine the impact of ultraviolet (UV) treatment
combined with chlorination/chloramination on natural organic matter (NOM) reactivity and the
formation of regulated and unregulated disinfection byproducts (DBPs). Previous research has
demonstrated 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 using
NOM concentrated from a full-scale surface water treatment plant by reverse osmosis (RO) and
fractionated on XAD resins according to polarity and acid/base/neutral properties. Differences
in DBP formation were investigated through various combinations of UV, chlorination, and
chloramination treatments in the presence/absence of nitrate and bromide among the NOM
fractions and these differences compared to those produced with the same treatments on the
original RO concentrate. With the addition of medium pressure UV irradiation prior to
chlorination of the RO concentrate, the chlorine demand increased by 35% and the concentration
of chloroform doubled. Trichloronitromethane and dimethylnitramine formation increased as a
result of medium pressure UV followed by chlorination or chloramination while
nitrosodimethylamine formation increased as a result of medium pressure UV followed only by
chlorination. The use of concentrated fractions also permitted observations of trends in the
formation of nitrogen-containing byproducts that are often below detection in disinfected natural
waters. UV effects on DBP formation were confirmed with Suwannee River natural organic
matter. Includes 10 references, tables, figures.
| Edition : | Vol. - No. |
| File Size : | 1
file
, 790 KB |
| Note : | This product is unavailable in Ukraine, Russia, Belarus |
| Number of Pages : | 7 |
| Published : | 11/01/2009 |
