Full Description

A significant fraction of the total organic halogen(TOX) in drinking water cannot be accounted for byknown specific disinfection byproducts (DBPs). Extensivestudies have been conducted to investigate factorsaffecting the formation of trihalomethanes andhaloacetic acids, the two groups of regulated DBPs.However, the formation and control of the other,unidentified halogenated DBPs, which may havepotential health risks, have not been well studied.This research evaluated the effect of reaction time,pH, dosage, and temperature on the formation ofunknown TOX (UTOX) during chlorination and chloramination.Results showed that the formation ofunknown DBPs significantly decreased as chlorinationor chloramination pH increased. Greater conversion ofUTOX to measurable byproducts occurred withincreasing reaction time, pH, dosage, and temperatureduring chlorination. The UTOX-to-TOX ratioincreased with reaction time but decreased with pHand dosage during chloramination.Study results can help water suppliers better controlthe formation of unknown DBPs as well as regulatedDBPs, thus reducing health risks associated with halogenatedDBPs in drinking water. Includes 31 references, table, figures.

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Edition: Vol. 100 - No. 8 Published: 08/01/2008 Number of Pages: 14 File Size: 1 file , 1 MB