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Water Lecture 3 A. Disinfection B. Water Safety Plans - page 18 / 47

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Disinfection Kinetics:  Chick’s Law First-Order or Exponential Kinetics

Assumes:

all organisms are identical

death (inactivation) results from a first-order or “single-hit” or exponential reaction.

Chick's law:

- dN/dT = kN

where:

N = number (concentration) of organisms

T = time

ln Nt/No = -kT

where No = initial number of organisms

Nt = number of organisms remaining at time = T

No = initial number of organisms (T = 0)

Also:

N/No = e-kT

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