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Wastewater Disinfection by PAA: Relating Residual Measurements and Inactivation

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With its potential for low (if any) disinfection byproduct (DBP) formation and easy retrofit for chlorine contactors, peracetic acid (PAA) or use of PAA in combination with other disinfectant technologies may be an attractive alternative to chlorine-based disinfection. Examples of systems that might benefit from use of PAA are water reuse schemes or plants discharging to sensitive receiving bodies. Though PAA is in use in numerous wastewater treatment plants in Europe, its chemical kinetics, microbial inactivation rates and mode of action against microorganisms are not thoroughly understood.

This paper presents results from experimental studies of PAA demand, PAA decay and microbial inactivation together with a complementary modeling analysis. Model results are used to evaluate techniques for measurement of PAA concentration and to develop hypotheses regarding the mode of action of PAA in bacterial inactivation. Kinetic and microbial inactivation rate data were collected for typical wastewaters and may be useful for engineers in evaluating whether to convert from chlorine to PAA disinfection.
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Document Type: Research Article

Publication date: 2005-01-01

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