ISSN : 2288-9167(Print)
ISSN : 2288-923X(Online)
ISSN : 2288-923X(Online)
Journal of Odor and Indoor Environment Vol.14 No.1 pp.16-21
DOI : https://doi.org/10.15250/joie.2015.14.1.16
DOI : https://doi.org/10.15250/joie.2015.14.1.16
Effects of gas retention time and liquid gas ratio for the simultaneous removals of hydrogen sulfide and bioaerosol in a wet-plasma process
11 November, 2014
19 December, 2014
24 March, 2015
Abstract
Odor compounds and air-born microorganisms are simultaneously emitted from various aeration processes such as aerobic digestion, food-waste compositing, and carcass decomposition facilities that are biologically-treating wastes with high organic contents. The air streams emitted from these processes commonly contain sulfur-containing odorous compounds such as hydrogen sulfide(H2S) and bacterial bioaerosols. In this study, a wet-plasma method was applied to remove these air-born pollutants and to minimize safety issues. In addition, the effects of a gas retention time and a liquid-gas ratio were evaluated on removal efficiencies in the wet-plasma system. At the gas reaction time of 1.8 seconds and the liquid-gas ratio of 0.05 mLaq/Lg, the removal efficiency of bioaerosol was approximately 75 %, while the removal efficiency of H2S was lower than 20 %, indicating that the gaseous compound was not effectively oxidized by the plasma reaction at the low liquid addition. When the liquid-gas ratio was increased to 0.25 mLaq/Lg, the removal efficiencies of both H2S and bioaerosol increased to greater than 99 %. At the higher liquid-gas ratio, more ozone was generated by the wet-plasma reaction. The ozone generation was significantly affected by the input electrical energy, and it needed to be removed before discharged from the process.
