Predicting disinfection performance in continuous flow systems from batch disinfection kinetics

Disinfection processes have often been characterized by the "CT" concept i. e., the product of disinfectant residual and contact time (perhaps as a fun ction of pH, temperature, and other water quality variations) produces a gi ven level of disinfection. The objective of this work was to develop and va lidate the use of reaction kinetic models for disinfection process design. Using bench scale (batch) kinetic information, and hydraulic characterizati on of pilot scale continuous disinfection processes, predictions of continu ous process performance were made using a segregated flow model. These pred ictions were compared to independent experimental measurements of actual in activation in pilot scale processes. Preammoniation, free residual chlorina tion, and ozonation were used on two waters from Portland, Oregon (US). Org anisms used were Giardia muris, bacteriophage MS2, and Escherichia coli. (C ) 1998 Published by Elsevier Science Ltd. All rights reserved.