The relative humidity (RH%) of inlet N2 gas was 100 % at 20 o C and atmospheric pressure. The effluent headline of the input N2 gas pipeline was dipped to the bottom of the seawater container to secure maximum contact with the seawater. This step was performed at room temperature. The humid gas was passed through a packed-bed DBD reactor made of quartz tube (I.D. of 4 mm and O.D. of 6.40 mm) with coaxial tungsten rod electrode (2.4 mm diameter)