Abstract
Objectives In this study, Peroxone-Quenching process auto control system was developed and appropriate chemical was selected for 2-MIB treatment and residual O3 remove in G WTP. Methods In order to analyze the disinfection effect by the O3 process, the Giardia inactivation ratio by disinfection process (O3, Cl) was calculated by âDisinfection efficiency calculation programâ made by Ministry of Environment. To optimize the Peroxone process, the 2-MIB removal rate was analyzed according to the operating conditions (O3 injection, H2O2/O3) and the equation of chemical injection rate was derived. To optimize the Quenching process, the correlation between dissolved O3 and atmospheric O3, the reduction rate of dissolved O3 concentration according to operation conditions (chemical injection rate, temperature, etc.) for each applied chemicals (H2O2, Na2S2O3) were analyzed. And the equation of chemical injection rate was derived. To appropriate chemical for Quenching process was selected by analyzing O3 removal efficiency and economic feasibility. Results and Discussion When water production increases, it is expected that the optimal operation of the O3 disinfection process will ensure the Giardia inactivation ratio over 1.0 in winter season. In the 2-MIB inflow, it was able to remove 70-100% of 2-MIB by Peroxone process operation. From the 2-MIB removal rate, an optimal O3 injection rate equation could be derived and optimal H2O2/O3 was confirmed to be 0.4. To reduce atmospheric O3, dissolved O3 remove is required. Factors affecting dissolved O3 removal by chemicals were injection rate, contact time, water temperature for H2O2, and injection rate, residual Cl for Na2S2O3. Using these factors, the equations of chemical injection rate for Quenching process were derived. As a result of the injection rate simulation for each chemicals, it is expected that the injection rate of Na2S2O3 can be lower than H2O2 (6-96%). Because O3 removal efficiency of Na2S2O3 is higher than H2O2, and Na2S2O3 is not affected by water temperature. The annual chemical purchase costs for Quenching process operation are estimated to be 131 million KRW for H2O2 and 87 million KRW for Na2S2O3. Considering to Quenching efficiency and economic feasibility, the application of Na2S2O3 was decided to be reasonable. Conclusions The Peroxone-Quenching process auto control system was installed and is operated now. It is expected to produce high quality tap water even with 2-MIB inflow by Peroxone process auto control system. And by the optimization of Quenching process, atmospheric O3 reduction for ensuring work place safety and economic operation would be expected. Key words: Ozone, AOP, Peroxone, Quenching, Residual Ozone Removal
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