A STUDY ON THE INJURY PROCESS OF ESCHERICHIA-COLI INDUCED BY CHLORINE

In this study, we tried to evaluate the physiological state of E. coli exposed to chlorine by using non-selective media and media supplement ed with different concentrations of selective agent. A new kinetic mod el transportation equation model - was developed based on the physiolo gical change of bacteria for describing the injury process of E. coli induced by chlorine and applied to the experimental results. Conclusio ns can be summarised as: 1) physiological state of E. coli exposed to chlorine can be determined by using different selective media; 2) the tolerance distribution of E. coli to sodium deoxycholate shifted to a lower concentration with contact time; 3) the transportation equation model presented in this study agrees with experimental results; and 4) the transportation equation model is applicable to analyse the injury process of E. coli in chlorination. (C) 1997 IAWQ. Published by Elsev ier Science Ltd.