Effect of UV Dose on Pathogen Inactivation

If the pathogens exist in a disperse form, the UV light can directly reach them and hence a complete disinfection can occur. The disinfection rate can then be described by first-order reaction kinetics, which is also called as Chick-Watson model (11)  

When a batch reactor is used in the disinfection, Eq. (14) can be integrated to 

Note that depends on operational parameters. The important parameter is the UV intensity (I). Thus, we have. 

The log-linear inactivation of pathogens in a batch reactor is determined as 

As shown in Eq. (19), lower density of particles (NE) present in the bulk liquid medium would lead to higher inactivation of pathogens. In the operation, either size 

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