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In this study, 8 nitrosamines (N-nitrosodimethylamine (NDMA), N-nitrosomethylethylamine (NMEA), N-nitrosopyrrolidine (NPYR), N-nitrosodiethylamine (NDEA), N-nitrosopiperidine (NPIP), N-nitrosomorpholine (NMOR), N-nitrosodi-n-propylamine (NDPA), N-nitrosodi-n-butylamine (NDBA)) were spiked into rapid sand-filtration water and post-ozone treatment water and the removal efficiencies in post-ozone (O3), O3/hydrogen peroxide (H2O2), ultraviolet (UV), UV/H2O2 and biological activated carbon (BAC) processes were simulated on a laboratory scale. As a result of simulating the O3 and O3/H2O2 processes at the drinking water treatment plant (DWTP) with O3 input concentration of 2 mg/L for short chain-nitrosamines such as NDMA, NMEA and NDEA, the removal efficiency was as low as 40% or less. On the other hand, long chain-nitrosamines and aliphatic cyclic structures such as NDPA, NPYR, NMOR, NPIP and NDBA showed relatively high removal efficiencies of about 40% to 90%. The removal efficiencies of nitrosamines in UV alone and in UV/H2O2 processes were 59~96% (UV dosage: 500 mJ/cm 2 ) and 86~100% (UV dosage: 1000 mJ/cm 2 ), respectively. The removal efficiency of UV/H2O2 process was almost similar to that of UV alone process. In the BAC process, NDMA showed the highest removal efficiency among 8 nitrosamines. The removal efficiencies of NDMA were 71% and 94%, respectively, when water temp. were 10°C and 25°C and EBCT was 15 min. In the case of NMOR with the lowest removal efficiencies, the removal rates were 27% and 42%, respectively. The removal efficiencies in the BAC process were in the order of NDMA, NMEA, NDEA, NDPA, NDBA, NPYR, NPIP and NMOR. In order to effectively control of nitrosamines in large scale DWTPs located downstream of the Nakdong River, an advanced oxidation process based on UV is more suitable than the O3 and O3/H2O2 processes currently in operation. In the case of the O3 and O3/H2O2 processes, it was also evaluated that it is possible to efficiently control the nitrosamines introduced into the DWTP when operated in combination with BAC process.

Evaluation of N-Nitrosamines Removal Capability by Using Simulated Advanced Drinking Water Treatment Process for the Downstream of Nakdong River