An investigation on NO removal by wet scrubbing using NaClO(2) seawater solution

The experiments were conducted to investigate the NO removal by wet scrubbing using NaClO(2) seawater solution in a cyclic scrubbing mode. Results show that, when the concentration of NaClO(2) in scrubbing solution is higher than 10 mM, a complete removal of NO can be achieved during the cyclic scrubbing process. The breakthrough time for seawater with 15 mM NaClO(2) is enhanced by 34.3 % compared with that for NaClO(2) freshwater. The extension of the breakthrough time for NaClO(2) seawater is mainly ascribed to the improved utilization of NaClO(2) in the solution. The good buffering ability of seawater could suppress the acidic decomposition of NaClO(2) into ClO(2) effectively. The analysis of reaction products indicates that the main anions in the spent liquor are chloride ions and nitrate ions. The calculation of NaClO(2) utilization according to the ion chromatography also agrees well with the experimental results of breakthrough times.