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Water Lecture 3 A. Disinfection B. Water Safety Plans - page 21 / 47

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 Microbial Inactivation Kinetics

First-order or exponential kinetics assumed

Chick’s Law and Chick-Watson Model

Assumption is often not met in practice

CT concept wrongly assumes 1st-order kinetics always occur

Departures from 1st-order kinetics are common

Retardant curves: “persistent fraction”; mixed populations; aggregation

Declining rate:  decline in disinfectant concentration over time.

“Shoulder” curves: multihit kinetics; aggregation

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