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Water Lecture 3 A. Disinfection B. Water Safety Plans - page 8 / 47

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Factors Influencing Disinfection Efficacy and Microbial Inactivation (Continued)

Type of Disinfectant and Mode of Action

Free chlorine: strong oxidant; oxidizes various protein sulfhydryl groups; alters membrane permeability; also,

oxidize/denature nucleic acid components, etc.

Ozone:  strong oxidant; ditto free chlorine

Chlorine dioxide: strong oxidant; ditto free chlorine

Electrochemically generated mixed oxidants:  

strong oxidant; probably ditto free chlorine

Combined chlorine/chloramines:  weak oxidant;

denatures sulfhydryl groups of proteins

Ultraviolet radiation:  nucleic acid damage:

thymidine dimer formation, strand breaks, etc.

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