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Water Lecture 3 A. Disinfection B. Water Safety Plans - page 14 / 47

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Factors Influencing Disinfection Efficacy and Microbial Inactivation - Water Quality

Particulates: protect microbes from inactivation;

consume disinfectant

Dissolved organics:  protect microbes from inactivation; consumes or absorbs (for UV radiation) disinfectant; Coat microbe (deposit on surface)

pH:  influences microbe inactivation by some agents

free chlorine more effective at low pH where HOCl predominates

neutral HOCl species more easily reaches microbe surface and penetrates)

negative charged OCl- has a harder time reaching negatively charged microbe surface

chlorine dioxide is more effective at high pH

Inorganic compounds and ions:  influences microbe inactivation by some disinfectants; depends on disinfectant

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