Abstract
The experiments were conducted to investigate the NO removal by wet scrubbing using NaClO2 seawater solution in a cyclic scrubbing mode. Results show that, when the concentration of NaClO2 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 NaClO2 is enhanced by 34.3 % compared with that for NaClO2 freshwater. The extension of the breakthrough time for NaClO2 seawater is mainly ascribed to the improved utilization of NaClO2 in the solution. The good buffering ability of seawater could suppress the acidic decomposition of NaClO2 into ClO2 effectively. The analysis of reaction products indicates that the main anions in the spent liquor are chloride ions and nitrate ions. The calculation of NaClO2 utilization according to the ion chromatography also agrees well with the experimental results of breakthrough times.
Highlights
Air pollution is currently one of the major problems worldwide, resulting that more rigorous environmental laws are introduced
For both freshwater and seawater, when there is 20 mM NaClO2 added in the solution, Nitric oxide (NO) concentration decreases sharply to zero within several minutes at the beginning of the scrubbing process
The result of blank experiment and acidic titration demonstrates that the extension of breakthrough time for NaClO2 seawater might be ascribed to the buffering ability of seawater, which could suppress the acidic decomposition of NaClO2 into ClO2
Summary
Air pollution is currently one of the major problems worldwide, resulting that more rigorous environmental laws are introduced. The main source of air pollution is the combustion process of fossil fuels used in power plants, vehicles, ships and other incineration processes (Skalska et al 2010). The implementation of stringent regulations of NOx emission requires the development of new technologies and improvement of currently used methods for NOx removal from exhaust gas. Technologies for the NOx removal can be divided into combustion control and post-combustion treatment. Post-combustion control methods include a variety of techniques such as selective catalytic reduction (SCR) (Zhang et al 2015; Jiang et al 2015), selective noncatalytic reduction (SNCR) (Lee et al 2008), thermal DeNOx and scrubbing.
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