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COMPARATIVE DISINFECTION EFFICIENCY OF PULSED AND CONTINUOUS-WAVE UV IRRADIATION TECHNOLOGIES
Citation:
BOHREROVA, A., H. SHEMER, R. Lantis, CHRISTOPHER IMPELLITTERI, AND K. G. LINDEN. COMPARATIVE DISINFECTION EFFICIENCY OF PULSED AND CONTINUOUS-WAVE UV IRRADIATION TECHNOLOGIES. 10.1016/j.watres, M. Henze (ed.), WATER RESEARCH. Elsevier Science Ltd, New York, NY, 42(12):2975-2982, (2008).
Impact/Purpose:
to publish information
Description:
Pulsed UV (PUV) is novel UV irradiation system that is a non-mercury lamp based alternative to currently used continuous-wave systems for water disinfection. To compare the polychromatic PUV irradiation disinfection efficiency with that from continuous wave monochromatic low-pressure (LP) and polychromatic medium-pressure (MP) UV systems, three alternative methods for UV fluence measurement were utilized for each technology. Two types of actinometry (ferrioxalate and iodate/iodide) and absolute spectral emission methods were used for fluence measurement. All three methods were in good agreement. Once accurate and reliable methods for fluence measurement were established, the inactivation of E. coli and phages T4 and T7 were investigated under each technology. Inactivation was significantly faster using PUV irradiation compared to LP or MP UV lamps at equivalent fluence levels. A significant fraction of the enhanced PUV inactivation efficiency was due to wavelengths greater than 295 nm.
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COMPARATIVE DISINFECTION EFFICIENCY OF PULSED AND CONTINUOUS-WAVE UV IRRADIATION TECHNOLOGIES