Estimating the Water Saturation by Partitioning Gas Tracer Test Using Moment Analysis and CXTFIT Fitting:A Comparison
Water saturation is a key factor controlling the rate of waste degradation in municipal solid waste landfills and is essential to know how much liquid should be adding when operating a landfill as bioreactor landfill. Partitioning gas tracer test (PGTT) is suggested as a useful tool for in situ measurement of water saturation over large measurement volumes in landfills. In this work, PGTT was examined in sand column over a range of water saturation (0 ≦ Sw ≧ 46.76％) using helium (He) as conservative tracer and difluoromethane (DFM) as portioning tracer. The results indicated that PGTT often resulted in underestimation of water saturation due to the rate-limited transfer between gas and water phases, and the measurement errors increased as increasing the water saturation. Sw derived from the moment analysis of truncated breakthrough curves resulted in larger error, while CXTFIT fitting reduced the measurement error, although it would not eliminate the systematic underestimation of Sw when mass transfer limitation was significant.
water saturation partitioning gas tracer test (PGTT) moment analysis CXTFIT
Huayong WU Yaxin ZHANG Hongtao WANG Wenjing LU
School of Environment, Tsinghua University. Beijing, China, 100084
国际会议
The Sixth International Conference on Waste Management and Technology(第六届固体废物管理与技术国际会议 ICWMT 6)
苏州
英文
31-35
2011-08-30（万方平台首次上网日期，不代表论文的发表时间）