TY - JOUR
T1 - Improvement of water disinfection process by UV-C irradiation
AU - Said, Myriam Ben
AU - Mustapha, Mounir Ben
AU - TraBelsi, Dhekra
AU - Hassen, Abdennaceur A.
AU - Abdeljellil, Chammam
PY - 2011
Y1 - 2011
N2 - In order to improve the process of water disinfection (waste water and drinking water) by UV-C irradiation, a low pressure UV lamp was supplied by two types of electronic power: traditional power at 50 Hz and high frequency power at 64 KHz. The simulation of bacterial inactivation kinetics using a mathematical model of « series-events » demonstrated the ability of the high frequency UV lamp to provide an effective UV dose capable of inactivating bacteria over a shorter exposure time than that determined for a conventional UV-C lamp. Moreover, the determination of bacterial reactivation factor (Cr) after a rest time in the presence and or in absence of visible light showed an irreversible inactivation in the tested bacteria of the photo-dependent and photo-independent reactivation mechanisms in the case of irradiation by the high frequency UV-C lamp. The increase in the bacterial inactivation without subsequent reactivation, for a reduced time of UV exposure, is consistent with the increase of the monochromatic UV spectral radiant flux at 253,7 nm provided by the high frequency power supply UV-C lamp (64 KHz). The increase of germicidal UV flux overcomes the disadvantages related to the use of a conventional UV lamp, namely the determination of a lethal dose and problems related to bacterial reactivation after treatment by ultraviolet light.
AB - In order to improve the process of water disinfection (waste water and drinking water) by UV-C irradiation, a low pressure UV lamp was supplied by two types of electronic power: traditional power at 50 Hz and high frequency power at 64 KHz. The simulation of bacterial inactivation kinetics using a mathematical model of « series-events » demonstrated the ability of the high frequency UV lamp to provide an effective UV dose capable of inactivating bacteria over a shorter exposure time than that determined for a conventional UV-C lamp. Moreover, the determination of bacterial reactivation factor (Cr) after a rest time in the presence and or in absence of visible light showed an irreversible inactivation in the tested bacteria of the photo-dependent and photo-independent reactivation mechanisms in the case of irradiation by the high frequency UV-C lamp. The increase in the bacterial inactivation without subsequent reactivation, for a reduced time of UV exposure, is consistent with the increase of the monochromatic UV spectral radiant flux at 253,7 nm provided by the high frequency power supply UV-C lamp (64 KHz). The increase of germicidal UV flux overcomes the disadvantages related to the use of a conventional UV lamp, namely the determination of a lethal dose and problems related to bacterial reactivation after treatment by ultraviolet light.
KW - Bacterial inactivation kinetics
KW - Bacterial reactivation
KW - Eletronic power
KW - UV irradiation
KW - UV low pressure lamp
UR - http://www.scopus.com/inward/record.url?scp=84857572049&partnerID=8YFLogxK
U2 - 10.7202/1006475ar
DO - 10.7202/1006475ar
M3 - Article
AN - SCOPUS:84857572049
SN - 0992-7158
VL - 24
SP - 241
EP - 250
JO - Revue Des Sciences De L'Eau
JF - Revue Des Sciences De L'Eau
IS - 3
ER -
