Abstract: The effects of UV intensity and turbidity on selected microbial
indicator inactivation were investigated. Results showed that UV disinfection
was effective in killing all the selected microbial indicators, the resistance
order of the microorganisms was as follows: MS-2 coliphage >
Bacillus subtilis > E. coli > Staphylococcus aureus
and Candida albicans. UV intensity had influence on the inactivation of all the
microorganisms, high UV disinfection efficency was obtained with higher UV
intensity. Turbidity had impact on the bacteria inactivation rate, but there
was no evidence that turbidity had any negative contribution to MS-2 coliphage.
Under the same UV dosage, higher UV intensity could overcome the negative
influence of turbidity on UV performance, enhanced microorganism inactivation
effect in turbidity water.
Keywords: UV disinfection, intensity, exposure time, microbial indicator