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The work described in this paper has been undertaken to validate the CT values of the ozonecontactors of the DesBaillets (1136 MLD) water treatment plant (Montreal, Quebec, Canada) by means of abiodosimetric technique. Indigenous aerobic spore formers (ASF) were used as surrogates formonitoring disinfection efficacy.Four biodosimetric assays were completed on-site over a 6-week period. The approachdeveloped involved the implementation of reference biodosimetric curves followed by thefull-scale validations.Reference biodosimetric curves were generated using an ozone pilot apparatus (18Lpm). A precise measurement of ASF inactivation was obtained using a high-volumefiltration technique (10 L).The following day, full-scale ozone experiments were performed. Those assays alsoenabled the calculation of the regulatory CTsub1/sub0 and the CTsubIDDF/sub values. The effective CTwas calculated based on the reference curve developed on the pilot contactor. CTvalues were then compared to evaluate the accuracy of the models and validate theirpredictions. Includes 20 references, figures.

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Edition: Vol. - No. Published: 11/01/2006 Number of Pages: 10File Size: 1 file , 430 KB