Civil Engineering, Univ. of Nebraska-Lincoln, Lincoln, NE, USACivil Engineering, Univ. of Nebraska-Lincoln, Lincoln, NE, USACivil Engineering, Univ. of Nebraska-Lincoln, Lincoln, NE, USA
Yuan Feng;M. Sina Mousavi;Jongwan Eun
Landfill gas (LFG) is not only the third largest source of methane gas in the U.S., but also includes hazardous and strongly odorous gas that is often a nuisance to landfill neighbors, resulting in strained relationships with the community, regulatory actions, and, in some cases, costly litigation. As one of the alternatives controlling LFG during the operation of a landfill, a co-extruded geomembrane (GM) with an ethylene vinyl-alcohol (EVOH) layer sandwiched between two inner low-density polyethylene (LLDPE) layers have been introduced to reduce the flux of organic contaminants in the barrier systems of a landfill. In this study, field emissions of methane among LFGs from composite intermediate cover consisting of soils with conventional LLDPE or co-extruded EVOH GM were comparatively evaluated. The field pilot testing site in an operating landfill located in Nebraska was designed and constructed based on minimizing the boundary effect of the cover. The results show significant reduction of methane transport through the EVOH cover. To compare the emission through LLDPE, intermediate cover with EVOH GM reduces the release of gas into the chamber by approximately 85, 73, and 65% after three weeks, two months, and three months, respectively.