An Experiment of NO (nitrogen monoxide) Adsorption by a Soil Filter

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  • SEKI Hirakazu
    Division of Civil and Environmental Engineering, Natural Science and Technology, Kanazawa University, Kakumamachi, Kanazawa, Ishikawa-ken, 920-1192, Japan
  • OKUMURA Tsunao
    Division of Civil and Environmental Engineering, Natural Science and Technology, Kanazawa University, Kakumamachi, Kanazawa, Ishikawa-ken, 920-1192, Japan

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  • 土壌フィルターによるNO吸着実験
  • ドジョウ フィルター ニ ヨル NO キュウチャク ジッケン

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Abstract

In this paper, NO (nitrogen monooxide) adsorption ability of a soil filter was considered both experimentally and theoretically as the first step in developing a new nitrogen recovery system using the soil filter and plants. In this proposed system, a gas component NO that is discharged from fixed sources such as incineration plants will be trapped by a soil filter and transformed into NO3-, and then absorbed by the plants. At first, by comparing the O2 breakthrough curve obtained experimentally with that calculated from the analytical solution of O2 concentration, the apparent gas diffusivity in the soil filter was obtained. Next, assuming that the rate of adsorption follows a linear driving force (LDF) model, two parameters a (equilibrium constant) and Θ (time constant) of the LDF model were evaluated for each experiment, and a solution of NO concentration was numerically derived. The validity of the solution was proved by comparing the NO breakthrough curve obtained experimentally with that calculated numerically. The value of Θ greatly differs according to soil texture, and the value of a is large under moderate moisture content conditions. Since the adsorption ability of the soil filter is small, however, it seems insufficient to use the soil alone as a filter to trap NO from fixed sources.

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