Journal of environmental and Sanitary engineering (환경위생공학)

Korean Society for Environmental Sanitary Engineers (대한환경위생공학회)
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Removal Characteristics of NOx Using a Mixed Soil-Biofilter

토양 혼합여재를 이용한 질소산화물 제거특성

  • Cho, Ki-Chul (Dept. of Environmental Life Science, Dongnam Health College) ;
  • Sin, Eun-Sang (Dept. of Environmental Life Science, Dongnam Health College) ;
  • Hwang, Gyeong-Cheol (Dept. of Environmental Life Science, Dongnam Health College) ;
  • Cho, Il-Hyoung (Institute of Strategy Environmental Research) ;
  • Lee, Nae-Hyun (Dept. of Environmental Eng, Strategy Engineering Corporation) ;
  • Yeo, Hyun-Gu (Kangwon Regional Small & Medium Business Administration)
  • Published : 2006.09.30
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Abstract

As traffic in city-centre around the world continues to increase, so levels of atmospheric pollutants continue to rise. High concentrations of NOx can have negative effects on human health, and we must find new ways to reduce their levels in the air we breathe. Nitrogen oxide gas (NOx), consisting of nitrogen monoxide (NO) and nitrogen dioxide $(NO_2)$ produced using $O_3$ oxidation, at a low concentration corresponding to that on roads as a result of exhaust from automobiles, was carried out to evaluate the removal characteristics of NOx through a laboratory-scale biofilter packed with soil as a packing material. A mixture media (yellow soil (30%): soil (40%): compost (10%): a used briquet (20%)) was applied. After about 1day of operation, the removal efficiency for $NO_2$ in all experiments with a constant condition ($25^{\circ}C$ and water humidity (60%)) was over 98%. The retention times of the section between phase I and phase II for formation and reduction of $NO_3$ NO and $NO_2$ on the initial $NO_3$ concentration was 50min $(O_3:195\;ppb),\;55min\;(O_3:925\;ppb),\;65min\;(O_3:1743\;ppb),\;70min\;(O_3:2616\;ppb),\;75min\;(O_3:3500\;ppb)$, respectively The soil biofilter system is a unique technology that purifies urban air by utilizing the natural processes that take place in the soil. Although some of the processes are quite complex, they can broadly be summarized as adsorption onto soil particles, dissolution into soil pore water, and biochemical.

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