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

Abstract

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 analyzed 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 1 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, respectively. 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, Hom, and Selleck from our experimental data obtained for chlorine are: log(N/N0)=0.16CT with n=1, log(N/N0)=0.71C0.87T with n≠1, for Chicks-Watson model, log (N/N0)=1.87C0.47T0.36 for Hom model. For chlorine dioxide are: log(N/N0)=1.53CT with n = 1, log(N/N0)=2.29C0.94T with n가1, for Chicks-Watson model, log(N/N0)=3.64C0.43T0.24 for Hom model and for ozone are: log(N/N0)=2.59CT with n=1, log(N/N0)=2.82 C0.36T with n가1, for Chicks-Watson model, log(N/N0)=4.53C0.26T0.19 for Hom model.