Simulation on Behaviors of Pollutants in Semi-aerobic Landfill Layers

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  • Park Sangchul
    Department of Civil Engineering, Faculty of Engineering, Kyushu University
  • Kusuda Tetsuya
    Department of Civil Engineering, Faculty of Engineering, Kyushu University
  • Shimaoka Takayuki
    Department of Civil Engineering, Faculty of Engineering, Fukuoka University
  • Hanashima Masataka
    Department of Civil Engineering, Faculty of Engineering, Fukuoka University

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Other Title
  • 準好気性埋立廃棄物層における汚濁物質挙動のシミュレーションと影響因子の検討
  • ジュン コウキセイ ウメタテ ハイキブツソウ ニ オケル オダク ブッシツ キ

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Abstract

The purpose of this study is to make a mathematical model for conversion processes of organic carbon and nitrogens in landfilled layers under semi-aerobic conditions and also to estimate better conditions for landfill. This model is a 1-D three phase model which is composed of several processes including elusion of pollutants from solid waste, microbial decomposition, convection and dispersion in the liquid phase, exchange of liquid in the mobile and stagnant liquid zones, transport between liquid and gas phases, and convection and diffusion in the gas phase. Microbial decompositions consist of aerobic, acid forming and methane producing processes. Microbe growth rates are expressed as a function of both temperature calculated by heat balance and pH in terms of alkalinity.<BR>Numerical simulation results indicate that the elusion of organic matter in the upper layer, aerobic decomposition of organic matter in the middle, and aerobic decomposition, nitrification and denitrification in the lower are predominant. Aerobic zones, especially the bottom layer of the semi-aerobic landfill, play a significant role in the purification of leachate.

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