UV disinfection with low dosage of 40 mJ/cm
mineralize DOM, but might split chemical bonds or change the
characteristics of functional groups of DOM. This modiﬁcation
of DOM structure by UV is likely not to stimulate biological re-
growth and bioﬁlm formation in distribution system, but can
have negative effects on water quality by increase of chlorine
demands and DBP formation with following post-chlorina-
tion, especially in medium pressure and vacuum UV systems.
To guarantee the safety of drinking water from pathogenic
microorganisms and harmful DBPs at the same time, the
processes to reduce the precursors of DBP are required when
considering UV installation.
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