Clogging of Gravel Drainage Layers Permeated with Landfill Leachate
Publication: Journal of Geotechnical and Geoenvironmental Engineering
Volume 133, Issue 8
Abstract
Ten flow cells, called mesocosms, are used to investigate the effect of different gravel sizes (38 and ) and operating conditions on clogging of leachate collection systems. These mesocosms simulated in real time and real scale the two-dimensional leachate flow conditions representative of a section of a continuous -thick gravel drainage blanket adjacent to a leachate collection pipe in a primary leachate collection system. The tests were terminated after of operation. In some mesocosms the full of gravel was saturated. In others, the leachate level was initially set at and the upper were unsaturated. Although the flow through all mesocosms was similar, the clogging in the fully saturated gravel was substantially more than in the partially saturated gravel. After of operation, typically, less than 10% of the initial pore space was filled with clog material in the unsaturated gravel. For the saturated zone, 45% of the initial pore space was filled with clog material in the fully saturated design as compared to only 31% in the partially saturated design. The gravel performed much better than the gravel. For example, it maintained a hydraulic conductivity that was higher than the gravel even after operating for twice as long. Up to four mesocosms were placed in series, with the effluent from one mesocosm being the influent for another. The reduction in mass loading within the first mesocosm reduced the amount of clogging within the mesocosm later in series. There was a clear progression of decreasing amounts of initial pore space filled with clog material in the last mesocosm in series, and most of the clogging was due to the vertically percolating leachate.
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Acknowledgments
Funding for the research was provided by the Natural Sciences and Engineering Research Council of Canada. The writers are grateful to Eugene Benda and Bernie Chau from the City of Toronto for their valuable support and assistance. Assistance by Dr. J. F. VanGulck and Andrew Cooke with the termination of the mesocosms is also gratefully acknowledged. These tests were initiated by Dr. I. R. Fleming and were maintained for several years by Mr. Mark Armstrong; their contributions are very gratefully acknowledged.
References
Armstrong, M. D. (1998). “Laboratory program to study clogging in a leachate collection system.” MS thesis, Dept. of Civil and Environmental Engineering, Univ. of Western Ontario, London, Ont., Canada.
ASTM. (1998). “Standard test methods for specific gravity of soil solids by water pycnometer (D854-98).” Annual book of ASTM standards, Vol. 04.08, West Conshohocken, Pa.
Bouchez, T., Munoz, M.-L., Vessigaud, S., Bordier, C., Aran, C., and Duquennoi, C. (2003). “Clogging of MSW landfill leachate collection systems: Prediction methods and in situ diagnosis.” Proc., 9th Int. Sardinia Symp. on Waste Management and Landfill (CD-ROM), CISA, Environmental Sanitary Engineering Centre, Cagliari, Italy.
Brune, M., Ramke, H. G., Collins, H. J., and Hanert, H. H. (1994). “Incrustation problems in landfill drainage systems.” Landfilling of waste: Barriers, E & FN Spon, London, 569–605.
Fleming, I. R. (1999). “Biological processes and clogging of landfill leachate collection systems.” Ph.D. thesis, Dept. of Civil and Environmental Engineering, The Univ. of Western Ontario, London, Ont., Canada.
Fleming, I. R., and Rowe, R. K. (2004). “Laboratory studies of clogging of landfill leachate collection and drainage systems.” Can. Geotech. J., 41(1), 134–153.
Fleming, I. R., Rowe, R. K., and Cullimore, D. R. (1999). “Field observations of clogging in a landfill leachate collection system.” Can. Geotech. J., 36(4), 685–707.
Levine, A. D., et al. (2005). “Assessment of biogeochemical deposits in landfill leachate drainage systems.” Final Rep., Florida Center for Solid and Hazardous Waste Management, Univ. of Florida, Gainesville, Fla., ⟨http://www.hinkleycenter.com/publications/bysubject.htm⟩.
Maliva, R. G., et al. (2000). “Unusual calcite stromatolites and pisoids from a landfill leachate collection system.” Geology, 28(10), 931–934.
McIsaac, R., and Rowe, R. K. (2006). “Effect of filter separators on the clogging of leachate collection systems.” Can. Geotech. J., 43(7), 674–693.
McIsaac, R. S. (2007). “An experimental investigation of clogging in landfill leachate collection systems.” Ph.D. thesis, Dept. of Civil and Environmental Engineering, The Univ. of Western Ontario, London, Ont., Canada.
Rittmann, B. E., Fleming, I. R., and Rowe, R. K. (1996). “Leachate chemistry: Its implications for clogging.” Proc., North American Water and Environment Congress (CD-ROM), ASCE.
Rowe, R. K. (2005). “Long-term performance of contaminant barrier systems.” Geotechnique, 55(9), 631–678.
Rowe, R. K., Armstrong, M. D., and Cullimore, D. R. (2000). “Mass loading and the rate of clogging due to municipal solid waste leachate.” Can. Geotech. J., 37(2), 355–370.
Rowe, R. K., Quigley, R. M., Brachman, R. W. I., and Booker, J. R. (2004). Barrier systems for waste disposal facilities, E & FN Spon, London.
Rowe, R. K., and VanGulck, J. F. (2003). “Experimental and modeling study into clogging of leachate collection systems.” Proc., 9th Int. Sardinia Symp. on Waste Management and Landfill (CD-ROM), CISA, Environmental Sanitary Engineering Centre, Cagliari, Italy.
VanGulck, J. F., and Rowe, R. K. (2004). “Influence of landfill leachate suspended solids on clog (biorock) formation.” Waste Manage., 24(7), 723–738.
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© 2007 ASCE.
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Received: Sep 11, 2006
Accepted: Feb 12, 2007
Published online: Aug 1, 2007
Published in print: Aug 2007
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