DISINFECTION--Barrier UV - B Series

energy
output at the desired disinfection
wavelength of 254 nm. Wasted energy is
minimized and power consumption can
be as much as 70% lower than an equivalent
medium-pressure system. Also,
Spektrotherm lamps have a longer operating
life (10,000 hrs vs. 3-5,000 hrs) than
medium-pressure lamps, resulting in fewer
lamp replacements. In addition, since the
low-pressure lamps operate at a lower temperature,
they are less prone to fouling,
requiring no wiping and infrequent chemical
cleaning, and can tolerate no-flow conditions
over an extended period of time
without overheating. Finally, solid amalgam
lamp technology lessens the environmental
risk associated with liquid mercury.
REACTOR VALIDATION
In potable water applications, it has been
determined that a UV dose of 40 mJ/cm2
is required to consistently achieve 4 log
inactivation of the most prevalent pathogens.
To verify that a UV system is capable
of delivering this dose, and to avoid
the need for expensive on-site bioassay
testing, a reactor validation is required.
Proper certification requires the dose delivery
to be measured by actual bioassay
testing, not inferred performance based
on modeling. Presently, there are only two
facilities in the world that are recognized
for certifying UV systems (?NORM, in
Austria, and DVGW, in Germany) for municipal
drinking water applications. The
Barrier UV System has been certified
by the Austrian ?NORM M5873-1
standard to provide the required UV
dose for potable water applications.

long-effective useful life of low-pressure,
low-intensity lamps while producing up to
five times more UV-C output (watts). This
minimizes system size and reduces overall
capital and operating costs, since up to 80%
fewer lamps are required (compared to
conventional low-pressure systems) to deliver
the same absolute UV disinfection
power. In addition, using a solid amalgam
as opposed to liquid mercury, these lamps
are temperature-stable for the wide temperature
ranges encountered in potable water
applications (32 - 113