Seepage Control Strategies at Bioreactor Landfills
Publication: Journal of Hazardous, Toxic, and Radioactive Waste
Volume 17, Issue 4
Abstract
The occurrence of leachate seepage at side slopes of municipal solid waste landfills represents a major design and operational concern at bioreactor landfills where leachate is recirculated into the waste mass to enhance degradation of organic materials. Full-scale bioreactor landfills typically add liquids to the waste under pressure to optimize moisture distribution. When liquids are added at a high pressure or at a flow rate higher than the absorption capacity of the waste mass, there is a possibility of seeps. Two general approaches to controlling landfill leachate seepage are described: a less aggressive strategy where liquid volumes are limited to avoid seeps and a more aggressive strategy where seeps are more likely to occur but with design and operation considerations in place to mitigate seepage. Liquids addition into waste using buried horizontal trenches was modeled to determine moisture distribution under a variety of conditions most likely to lead to leachate seepage at bioreactor landfills. Based on the modeling results, leachate seepage can occur in the presence of both high- and low-permeability soil layers. In addition, the injection pressure and setback distance of recirculation devices play important roles in seepage prevention and control. Several practical seepage control strategies are illustrated, including the selection and placement of daily or intermediate cover materials, pressure control, and the application of a clay plug as part of recirculation device design and construction. Finally, the setback distance for a horizontal injection trench was calculated based on the saturated zone equation; the setback distance provides a way to estimate the appropriate recirculation device design distance to prevent seepage at bioreactor landfills.
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Acknowledgments
This work was the product of a project conducted by Innovative Waste Consulting Services, LLC for the U.S. EPA’s Office of Research and Development.
References
Haydar, M., and Khire, M. (2007). “Leachate recirculation using permeable blankets in engineered landfills.” J. Geotech. Geoenviron. Eng., 133(4), 360–371.
Jain, P., Townsend, T. G., and Tolaymat, T. M. (2010a). “Steady-state design of horizontal system for liquids addition at bioreactor landfills.” Waste Manage., 30(12), 2560–2569.
Jain, P., Townsend, T. G., and Tolaymat, T. M. (2010b). “Steady-state design of vertical wells for liquids addition at bioreactor landfills.” Waste Manage., 30(11), 2022–2029.
Khire, M. V., and Mukherjee, M. (2007). “Leachate injection using vertical wells in bioreactor landfills.” Waste Manage., 27(9), 1233–1247.
Krahn, J. (2007). Seepage modeling with SEEP/W: An engineering methodology, 2nd Ed., GEO-SLOPE International Ltd., Calgary, AB, Canada.
Landva, A. O., Pelkey, S. G., and Valsangkar, A. J. (1998). “Coefficient of permeability of municipal refuse.” Proc., Third Int. Congress on Environmental Geotechnics, Balkema, Rotterdam, 163–167.
McCreanor, P. T., and Reinhart, D. R. (2000). “Mathematical modeling of leachate routing in a leachate recirculating landfill.” Water Res., 34(4), 1285–1295.
Powrie, W., and Beaven, R. P. (1999). “Hydraulic properties of household waste and implications for landfills.” Proc. Inst. Civil Eng. Geotech. Eng., 137(4), 235–247.
Schwarzbauer, J., Heim, S., Brinker, S., and Littke, R. (2002). “Occurrence and alteration of organic contaminants in seepage and leakage water from a waste deposit landfill.” Water Res., 36(9), 2275–2287.
Soh, I. E. T., and Hettiarachchi, H. (2009). “Potential lateral migration of leachate in flushing bioreactor landfills during aggressive leachate recirculation.” Pract. Period. Hazard. Toxi, Radioact. Waste Manage., 13(3), 174–178.
Tchobanoglous, G., Theisen, H., and Vigil, S. (1993). Integrated solid waste management, McGraw-Hill, New York.
Townsend, T. (1995). “Leachate recycle at solid waste landfills using horizontal injection.” Doctoral dissertation, Univ. of Florida, Gainesville, FL.
Xu, Q., Tolaymat, T., and Townsend, T. (2012). “Impact of pressurized liquids addition on landfill slope stability.” J. Geotech. Geoenviron. Eng., 138(4), 472–480.
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© 2013 American Society of Civil Engineers.
History
Received: Feb 27, 2012
Accepted: Jan 11, 2013
Published online: Jan 14, 2013
Discussion open until: Jun 14, 2013
Published in print: Oct 1, 2013
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