Removal kinetics for gaseous NO and SO by an aqueous NaClO solution mist in a wet electrostatic precipitator.

Removal kinetics for NO and SO by NaClO solution mist were investigated in a wet electrostatic precipitator. By varying the molar concentrations of NO, SO, and NaClO, the removal rates of NO and SO confirmed to range from 34.8 to 72.9 mmol/m s and 36.6 to 84.7 mmol/m s, respectively, at a fixed gas residence time of 0.25 s. The rate coefficients of NO and SO were calculated to be 0.679 (mmol/m) s and 1.401 (mmol/m) s based on the rates of the individual removal of NO and SO. Simultaneous removal of NO and SO investigated after the evaluation of removal rates for their individual treatment was performed. At a short gas residence time, SO gas removed more quickly by a mist of NaClO solution than NO gas in simultaneous removal experiments. This is because SO gas, which has a relatively high solubility in solution, was absorbed more rapidly at the gas-liquid interface than NO gas. NO and SO gases were absorbed as nitrite [Formula: see text] and sulfite [Formula: see text] ions, respectively, by the NaClO solution mist at the gas-liquid interface. Then, [Formula: see text] and [Formula: see text] were oxidized to nitrate [Formula: see text] and sulfate [Formula: see text], respectively, by reactions with [Formula: see text], ClO, HClO, and ClO in the liquid phase.