Full Description

In recent years, ultraviolet (UV) technology for drinking water disinfection has experienced rapidgrowth in North America and Europe driven by the needs of disinfection byproduct reduction andcontrol of emerging pathogens, such as Cryptosporidium, that are resistant to chlorination. TsinghuaUniversity did some work based on pilot scale UV system in Dongguan. The objective of this study was toevaluate the efficacy of UV systems for drinking water under pilot-scale conditions (continuous flowsystem) and compared with the collimated beam results using the same water quality. Theexperimental results showed that: UV was effective against E. coli and TBC. B. subtilis, and MS2was more UV-resistant especially when UVT was below 90%; the inactivation of microorganismsby UV could be described with first-order kinetics using fluence-inactivation data from laboratorystudies in CB tests for a certain fluence range, no inactivation at low fluences (shoulder) and nofurther increase of inactivation at higher fluences (tailing) was observed for some challengemicro-organisms; water quality and UV sensitivity of microorganism influenced the inactivationrate; for the daily monitor results of 13000 hours, UV could be a stable disinfectant fortotal coliform and TBC; and, the lamp intensity of the online monitor showed that the lamp efficiency decaywas limited within the first 12000 hours. Includes 10 references, tables, figures.

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Edition: Vol. - No. Published: 11/01/2008 Number of Pages: 13File Size: 1 file , 790 KB