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MONITORING OF METHANE IN AMBIENT AIR AS AN INDEX OF STABILIZATION AT LANDFILL SITES
( Noboru Tanikawa ),( Tomo Oikawa ),( Kazuei Ishii ),( Tohru Furuichi ) 한국폐기물자원순환학회 2002 APLAS Vol.2002 No.1
Methane (CH<sub>4</sub>), carbon dioxide (CO<sub>2</sub>), and nitrous oxide (N<sub>2</sub>O) are well known as being the main landfill gases. We used continuous analyzers to measure CH<sub>4</sub>, CO<sub>2</sub> and N<sub>2</sub>O in ambient air and also the direction and velocity of the wind at a point near the landfill site to evaluate a simple method of measuring the emission of landfill gases. When there was a wind velocity over 2-3 m/s blowing from the landfill site to the measurement point, the atmospheric levels of CO<sub>2</sub> ranged from about 380 to 480 ppm, and the N<sub>2</sub>O concentrations ranged from about 0.30 to 0.33 ppm, similar to background levels m this urban area. However, the CH<sub>4</sub> concentrations were dependent on the direction and the velocity of the wind. When there was a wind blowing in from the landfill site, CH<sub>4</sub> concentrations were always higher than about 2 ppm, the value considered to be the urban background concentration. It was supposed that gas emitted from the landfill site caused this increase of CH<sub>4</sub> concentration. If the CH<sub>4</sub> concentration increase was approximately equal to zero, we could judge that the landfill gas emission had almost ceased. The continuous measurement of CH<sub>4</sub> in ambient air near a landfill site is clearly a simple and effective method for monitoring landfill gas emissions and the CH<sub>4</sub> concentration in ambient air may be usable as an index of the degree of stabilization of the landfill site.