Moisture content is an important factor in landfill gas production and effective landfill stabilization management at bioreactor landfills. Moisture content was experimentally estimated by applying the rainfall hydrograph theory through cover materials, such as the general and bio-solid soil, in the Sudokwon landfill site. The rainfall hydrograph theory was used to analyze the water balance, in which moisture can be strongly affected by infiltration in the water balance. Cover material characteristics, such as bulk density, porosity, specific gravity, and hydraulic conductivity, were used to estimate the water balance of the landfill site. From the results of the water balance, runoff was increased, but evaporation and infiltration were decreased with increasing rainfall rate for both general and bio-solid soil. As the bulk density increased in both general and bio-solid soil, runoff was increased, but infiltration was decreased, because hydraulic conductivity in the cover material was decreased with increasing bulk density. Finally, the moisture content of landfill waste increased linearly, with increasing infiltration through the cover materials, even though the increment in moisture content was decreased along the depth of landfill.

• 이승희(경기대학교 이공대학 환경에너지공학과) | Seung-Whee Rhee (Department of Environmental Engineering, College of Engineering, Kyonggi University) Corresponding author