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This study investigated the influence of virus-particle association on ultraviolet (UV)disinfection. Specifically, the objectives of the study were to determine whether colloidalparticles could protect viruses from UV light and to determine which particlecharacteristics enhance protection. Three types of particles (kaolin clay, humic acid, andactivated sludge particles), two coagulants (alum and ferric chloride), two viral surrogates(MS2 coliphage and bacteriophage T4), two filtration conditions (no filtration or 0.5-micron filtration), and two UV doses were considered in a series of jar tests designed asfactorial experiments to evaluate the effect of particle characteristics (size, composition)on UV disinfection of particle-associated viruses. The results suggest that particulateorganic content is a critical parameter in the protection of waterborne viruses from UVdisinfection. The findings reinforce the importance of a multi-barrier approach topathogen control that includes the effective physical removal of particles and particle-associatedpathogens prior to disinfection. Includes 32 references, figures.

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Edition: Vol. - No. Published: 11/15/2004 Number of Pages: 10File Size: 1 file , 350 KB