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The main objective of this study was to characterize the effects of disinfectant concentration on the inactivation kinetics of A. hydrophila (ATCC 7966), focusing on the use of monochloramine. Preparation of bacterial suspension, experimental matrix, monochloramine disinfection, and viability assessment are all discussed. The inactivation kinetics was characterized by a lag phase followed by a pseudo-first order phase. Two different curves were observed corresponding to relatively low (0.5 and 1.1 mg/L as Cl2) and high (5.0 and 10.5 mg/L as Cl2) monochloramine concentrations. Each inactivation curve comprised an initial lag phase followed by a phase of pseudo-first order kinetics. The data were fit with the delayed Chick-Watson model. The lag phase for the low monochloramine concentrations corresponded to a relatively higher CT of 4.23 mg-min/L compared to that of 2.56 mg-min/L observed at the higher concentrations. Furthermore, the post-lag phase inactivation rate at relatively low monochloramine concentrations was 1.55 times lower compared to that at high monochloramine concentrations. These results were consistent with those reported by Dunahee and Mari¿as (2000) for E. coli. These authors also observed two distinct inactivation curves at low (0.1 and 1.0 mg/L as Cl2) and high (3.5 and 7.5 mg/L as Cl2) monochloramine concentrations. Includes 10 references, figures.

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Edition: Vol. - No. Published: 11/01/2002 Number of Pages: 5File Size: 1 file , 280 KB