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KMID : 1171820060210030015
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Journal of Environmental and Sanitary Engineering
2006 Volume.21 No. 3 p.15 ~ p.26
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Removal Characteristics of NOx Using a Mixed Soil-Biofilter
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Cho Ki-Chul
Shin Eun-Sang
Hwang Kyung-Chul
Cho Il-Hyoung
Lee Nae-Hyun
Yeo Hyun-Gu
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Abstract
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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 (NO₂) produced using O₃ 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 NO₂ in all experiments with a constant condition (25℃ and water humidity (60%)) was over 98%. The retention times of the section between phase Ⅰ and phase Ⅱ for formation and reduction of O₃, NO and NO₂ on the initial O₃ concentration was 50min (O₃:195 ppb), 55min (O₃:925 ppb), 65min (O₃:1743 ppb), 70min (O₃:2616 ppb), 75min (O₃:3500 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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KEYWORD
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Soil, Bio-filter, Mixture media, O₃, NO, NO₂, NOx
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