Effects of UV intensity and water turbidity on microbial indicator inactivation.
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.
Liu
Wen-jun
WJ
Department of Environmental Science and Engineering, Tsinghua University, Beijing, China. wjliu@tsinghua.edu.cn
Zhang
Yong-ji
YJ
D001412:Bacillus subtilis / Q000528:radiation effects; D001673:Biodegradation, Environmental; D002176:Candida albicans / Q000528:radiation effects; D003090:Coliphages / Q000528:radiation effects; D004203:Disinfection / Q000379:methods*; D004307:Dose-Response Relationship, Radiation; D004926:Escherichia coli / Q000528:radiation effects; D009391:Nephelometry and Turbidimetry; D013211:Staphylococcus aureus / Q000528:radiation effects; D013997:Time Factors; D014466:Ultraviolet Rays; D014865:Waste Disposal, Fluid / Q000379:methods*