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Water Lecture 3 A. Disinfection B. Water Safety Plans - page 17 / 47

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Disinfection Kinetics

Disinfection is a kinetic process; defined as a rate of kill over time

Increased inactivation with increased exposure or contact time.

Chick's Law: disinfection is a firstorder reaction. (NOT!)

Multihit-hit or concave up kinetics:  initial slow rate; multiple targets to be “hit”

Concave down or retardant kinetics:  initial fast rate; decreases over time

Different susceptibilities of microbes to inactivation; heterogeneous population

Decline of of disinfectant concentration over time

CT Concept: Disinfection can be expressed at the product of disinfectant concentration X contact time

Applies best when disinfection kinetics are first order

Disinfectant concentration and contact time have an equal effect on CT products

Applies less well when either time ofrconcentration is more important.

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