CHLORAMINES INACTIVATION OF ADSORPTIVE BACTERIA ON FINE CARBON PARTICLES IN DRINKING WATER

Disinfection efficiencies and influencing factors of fine carbon particles were evaluated under traditional process conditions. Response surface analysis was used to determine the optimal levels of the main factors. Under optimal conditions, the disinfection efficiencies increased from 40-50% to 89%. The largest disinfection efficiencies were obtained at mild particle levels (200 CNT/ml) and disinfection efficiencies (0.307 mg.L(-1)). Using a 2-parameter dynamic model, the main reaction constants of chlorination were determined. In addition, the chloramine reaction was of the first order (n = 1). The reaction rate constant (k(2)) was 2.068. The appropriate disinfection pH range of NH(4)Cl was 7.5-8.5 for adsorptive bacteria. Temperature and pH affected the decay velocity of NH(2)Cl significantly. The results showed that under the conditions of conventional water treatment, chloramine dosing has a limited ability to control bacteria in water.