정수소독공정에 이용되는 염소, 이산화염소, 오존 소독제의 비교, 고찰에 관한 연구

Comparison of Chlorine, Chlorine Dioxide and Ozone as Disinfectants in Drinking Water

The experiments for the characterization of inactivation were performed in a series of batch processes with the total coliform as a general indicator organism based on chlorine, chlorine dioxide and ozone as disinfectants. The water samples were taken from the outlet of settling basin in a conventional surface water treatment system that is provided with the raw water drawn from the mid-stream of the Han River. The inactivation of total coliform was experimentally ana-lyzed for the dose of disinfectant, contact time, pH, Temperature and DOC. The nearly 2.4, 3.0, 3.9 log inactivation of total coliform killed by injecting I mg/l at 5 minutes for chlorine, chlorine dioxide and ozone. For the inactivation of 99.9%(3 log), Disinfectants required were 1.70, 1.00 and 0.60 mg/l for chlorine, chlorine dioxide and ozone, respec-tively. The higher the pH is, the poorer the disinfections effects are in the range of pH 6-9 by using chlorine and ozone. But the influence of pH value on killing effects of chlorine dioxide is weak. The parameters estimated by the models of Chick-Watson, Horn, and Selleck from our experimental data obtained for chlorine are: log(N/No) = -0.16 CT with n = I, log(N/No) = -0.71 CO.87T with n ≠ 1, for Chicks-Watson model, log (N/No) = -1.87CO.47T0.36 Horn model. For chlorine dioxide are: log(N/No) = -1.53 CT with n = I, log(N/No) = -2.29C0.94T with n ≠ 1, for Chicks-Watson model, log(N/No) = -3.640.43T0.24 for Horn model and for ozone are: log(N/No) = -2.59 CT with n = 1, log(N/No) = -2.82 C0.36T with n ≠ I, for Chicks-Watson model, log(N/No) = -4.53CO.26T0.l9 for Horn model.