Factors Affecting Chlorine Disinfection

The factor Ct determines chlorine disinfection efficacy, where C is the disinfectant concentration in mg/l and t is the contact time in minutes. The degree of disinfection remains unchanged at a constant Ct value. This relationship is true when either of the two variables is increased while the other one is simultaneously decreased. Consequently, increasing the contact time increases the efficiency of a less effective disinfectant. Table 7.30.1 summarizes the ranges of Ct values of disinfectants for 99% inactivation of various microorganisms at 5°C.

Effective mixing of chlorine with wastewater is essential for effective bacterial kill. Diffusers inject chlorine directly into the path of the wastewater flow for effective

MINUTES OF TIME REQUIRED FOR 100% KILL OF ORGANISMS

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