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Pollutant Transformations in Landfill Layers

Kyushu University, Department of Civil Engineering, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812, Japan

Tetsuya Kusuda

Kyushu University, Department of Civil Engineering, 6-10-1 Hakozaki, Higashi-ku, Fukuoka 812, Japan

Takayuki Shimaoka

Fukuoka University, Department of Civil Engineering, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-01, Japan

Yasushi Matsufuji

Fukuoka University, Department of Civil Engineering, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-01, Japan

Masataka Hanashima

Fukuoka University, Department of Civil Engineering, 8-19-1 Nanakuma, Jonan-ku, Fukuoka 814-01, Japan

The behaviour of pollutants, in particular organic carbon and nitrogen, in solid waste landfill layers and factors affecting their decomposition have been studied using four large scale simulated lysimeters in four landfill thicknesses, and operated under semiaerobic conditions. This paper presents about 800 days of data through November 1991. Data in this study indicate that the thicker solid waste layer has lower production rates of Total Organic Carbon (TOC) and Total Nitrogen (T-N) than does the thinner layer. If the layer, however, becomes too thick, no significant increase in the removal rate of T-N is observed, as nitrogen is leached out in the form of NO₃. N without being denitrified at the bottom of the landfill layer. It is also assumed that temperature and pH in the landfill layer play important roles not only in microbial degradation, but also in dissolution of organic carbon and nitrogen.

Key Words: Solid wastes • semi-aerobic landfill • simulated landfill • landfill thickness • lysimeters • leachate • oxygen penetration.

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