The biodegradation of solid waste in bioreactor landfills is dependant on a number of factors including moisture content. Identification of relatively wet and dry areas throughout the landfill would help operators determine where moisture should be added or not. This study attempts to utilize seismic borehole techniques to identify changes in seismic wave velocity through the waste due to the addition of moisture. The study is based on the principle that P-wave velocity in a porous material increases with moisture content. The bioreactor landfill surveyed is located in Ste. Sophie, Quebec, Canada. Two vertical boreholes were installed 10 m apart and to a depth of 15 m, in order for vertical seismic profiles to be obtained. An initial characterization survey was conducted to understand seismic wave propagation through the waste. The P-wave velocity is on the order 290-370 m/s and the S-wave velocity is on the order of 140-175 m/s. Two-day surveys were conducted to note changes in P-wave velocity under relatively dry and wet conditions. There was no measurable change in P-wave velocity after the addition of approximately 7000 L of water between the boreholes. This is most likely due to that fact that it was not possible to sample the area between boreholes where change was most likely to occur and it was not possible to control exactly where the water was being added.

Additional Metadata
Conference 22nd Symposium on the Application of Geophysics to Engineering and Environmental Problems 2009, SAGEEP 2009
Citation
Glancy, T.E. (Taryn E.), Samson, C, & van Geel, P. (2009). Characterization of solid waste in a bioreactor landfill using seismic borehole methods. Presented at the 22nd Symposium on the Application of Geophysics to Engineering and Environmental Problems 2009, SAGEEP 2009.