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UV Oxidation and Disinfection Product Bulletins
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Summary: Until a few years ago,UV disinfection at economical
doses,was considered an ineffective barrier to
Cryptosporidium and Giardia cysts and oocysts.
However,pioneering research launched and funded by
Calgon Carbon Corporation in 1996,led to the
discovery that these organisms could be inactivated and
rendered non-pathogenic,at substantially less dose
levels than ever imagined.This discovery revealed
that broad-band UV light provided better than 99%
inactivation of both Cryptosporidium and Giardia at
UV doses of less than 10mJ/cm2.This discovery contra-
dicted all previous thought on the merits of UV used to
protect drinking waters and led to a Patent on the
process in 1998.
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Summary: The use of ultraviolet light irradiation has emerged as a
viable new technology for the disinfection of large water
supplies, particularly with regard to Cryptosporidium
inactivation. Bioassay tests, which use non-pathogenic
test organisms as surrogates, are typically used to
validate UV reactor performance. The use of bioassay
validations, with high flow rates, become impractical
and uneconomical.The difficulty in handling adequate
quantities of test organisms and the requirements for
large volumes of water under controlled conditions,
presents a major problem. Handling contaminated
water during and after tests presents a number of
issues. Finding a consistent water supply of 20 mgd
adds to these difficulties. How are engineers to scale
up design, provide for performance and specifications,
in a timely and cost effective manner?
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