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Modelling of reactivation after UV disinfection: Effect of UV-C dose on subsequent photoreactivation and dark repair
Ist Teil von
Water research (Oxford), 2007-07, Vol.41 (14), p.3141-3151
Ort / Verlag
Oxford: Elsevier Ltd
Erscheinungsjahr
2007
Quelle
MEDLINE
Beschreibungen/Notizen
The increased use of UV radiation as a wastewater treatment technology has stimulated studies of the repair potential of microorganisms following treatment. In this study, samples of unfiltered secondary effluent were irradiated with seven levels of UV-C doses (50–200
mW
s/cm
2) from six low-pressure lamps in an open-channel UV disinfection system. Following irradiation, samples were incubated at 20
°C under photoreactivating light or in darkness. Samples were analysed for 240
min following incubation.
The logistic model is proposed to explain the relation between photoreactivation and the UV-C dose received by the microorganisms. That model accurately fitted the data obtained in photoreactivation experiments, permitting interpretation of the estimated kinetic parameters:
S
m and
k
2. In the experiments carried out in darkness, a slight reactivation is observed (<0.1%), followed by a decay period in which survival decreases. In order to model this last period, a modification was made to the logistic model by including a term of mortality that assumes a zero-order kinetic. The parameters
S
m and
k
2, in both photoreactivation and darkness, show an exponential dependence on the UV-C inactivating dose. It is possible to predict their values, and hence the reactivation curve, from the equations proposed in this work.