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Introduction: Disinfection by UV Light
[Part II] |
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WIDE DISINFECTION SPECTRUM
THROUGH DIFFERENT TYPES OF LAMPS
The Barrier L series of Siemens Water Technologies is based on
the low pressure method (monochromatic lamps), the
Barrier M series on the medium pressure method (polychromatic
lamps). With these two series, Siemens Water Technologies is
in a position to offer the optimal solution depending
on the application, and manufactures individual UV
systems in accordance with customer requirements.
MONOCHROMATIC LAMPS (LOW PRESSURE METHOD)
The UV-C emission spectrum of (amalgam-) low pressure lamps emits a single energy
line at 253.7 nm being exactly the wave length mainly
responsible for the destruction of microorganisms.
This wavelength is absorbed by the cell nucleus of
the micro-organisms and destroys their DNA. Low pressure
lamps are regarded as extremely effective because
disinfection is achieved with low use of energy therefore
resulting in a good price-performance ratio. A special
characteristic is the temperature optimisation of
the Siemens Water Technologies low pressure lamps: optimal
disinfection is achieved at a water temperature between
5 and 15 °C.
This type of lamp is a particularly economical solution for flow rates up to
approx. 65 m3/h.
POLYCHROMATIC LAMPS (MEDIUM PRESSURE METHOD)
These lamps emit a wide wave spectrum destroying not only the DNA of microorganisms
but also the cell membrane, proteins, lipides and
enzymes. The microorganisms are therefore no longer
able to activate their repair mechanism. The design
of this type of UV systems is very compact. Applications
range from flow rates of 20 m3/h up to approx. 1000
m3/h caused by the disinfection spectrum of the lamps
(higher flow rates on demand). The selection of the
appropriate type of lamps depends on the respective
application and the conditions on site.
Siemens Water Technologies specialists choose the
most effective and economical solution
together with the customer.
Back:  Disinfection by UV Light [Part I]
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