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Advanced Oxidation Processes (AOP) have been interested for removing micropollutants in water. Most of water treatment plants (WTPs) located along the lower part of Nakdong River have adopted the O3/BAC process and have interesting in peroxone process a kind of AOP. This study evaluated the removal characteristics of residual hydrogen peroxide (H2O2) combining with the biofiltration process in the next BAC process when the hydrogen peroxide is applied for the WTP operating O3/BAC process. In the experiment, changing the temperature and the concentration of H2O2 of influent, the biofiltration process showed rapidly dropped the biodegradability when the H2O2 concentration was increased and lowered water temperature while BAC process maintained relatively stable efficiency. The influent fixed at 20°C and the concentration of H2O2 at 300 mg/L was continuously input for 78 hours. Most of the H2O2 in the influent did not remove at the biofiltration process controlled 5 to 15 minutes EBCT condition after 24~71 hours operating time while BAC process controlled 5 to 15 minutes EBCT showed 38~91% removal efficiency condition after 78 hours operating time. Besides, after 78 hours continuously input experiment, the biomass and activity of attached bacterial on the biofilter and BAC were 6.0 × 10 CFU/g, 0.54 mg・C/m・hr and 0.4 × 10 CFU/g, 1.42 mg・C/m・hr respectively. These biomass and activity values were decreased 99% and 72% in biofilter and 68% and 53% in BAC compared with initial condition. The biodegradation rate constant (kbio) and half-life (t1/2) in BAC were decreased from 1.173 min to 0.183 min and 0.591 min to 3.787 min respectively according to increasing the H2O2 concentration from 10 mg/L to 300 mg/L at 5°C water temperature and the kbio and t1/2 were 1.510 min to 0.498 min and 0.459 min to 1.392 min at 25°C water temperature. By increasing the water temperature from 5°C to 15°C or 25°C, the kbio were increased 1.1~2.1 times and 1.3~4.4 times. If a water treatment plant operating O3/BAC process is considering the hydrogen peroxide for the peroxone process, post BAC could effectively decrease the residual H2O2, moreover, in case of spilling the H2O2 into the water process line, these spilled H2O2 concentration can be able to decrease by increasing the EBCT at the BAC process.

daehan hwan'gyeong gonghag hoeji/daehan hwan-gyeonggonghakoeji

Removal Characteristics of Residual Hydrogen Peroxide (H2O2) according to Application of Peroxone Process in O3/BAC Process