Basis of disinfection
Inactivation of micro-organisms in a disinfection plant depends on the time that the micro-organism are exposed to the disinfectant. This is described by Chick’s law:
dn / dt = kN
dn/dt= necessary time to inactivate n micro-organisms
k =time constant depending on disinfectant,type of micro-organism and water quality
N =number of live micro-organisms t =time.
This differential equation can be integrated within limits to give the following equation:
N0=number of micro-organisms at the start
N1=number of micro-organisms after time t.
Based on the results of Chick’s law, Watson’s law can be developed:
Λ = coefficient of specific toxicity
C =concentration of disinfectant
n =exponent (normally around 1)
t =time after start-up.
This means that the relation between the number of active and inactive micro-organisms is a product of the concentration of the disinfectant and the exposure time.
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