lecture17

lecture17 - Lecture 17 Landfill operation and construction...

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Lecture 17 Landfill operation and construction
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References on landfill McBean, E.A., F.A. Rovers and G.J. Farquhar, 1995. Solid Waste Landfill Engineering and Design . Prentice Hall PTR, Englewood Cliffs, New Jersey. Qian, X., R. M. Koerner, and D. H. Gray, 2002. Geotechnical Aspects of Landfill Design and Construction . Prentice Hall, Upper Saddle River, New Jersey. Bagchi, A., 1994. Design, Construction, and Monitoring of Sanitary Landfill, Second Edition . John Wiley & Sons, New York. Daniel,D.E., and R.M. Koerner, 1995. Waste Containment Facilities, Guidance for Construction, Quality Assurance and Quality Control of Liner and Cover Systems . American Society of Civil Engineers, New York.
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MSW landfill cell construction Configuration of Daily Cell and Lifts Working Face (Frequently at 3:1 slope) Adapted from: McBean, E. A., F. A. Rovers, and G. J. Farquhar. Solid Waste Landfill Engineering and Design . Englewood Cliffs, New Jersey: Prentice Hall PTR, 1995. Daily Cover Cell Height Intermediate Cover Operational Cell
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MSW landfill operations Waste cell is typically 3 to 5 meters high Slope of working face controls area to volume of landfill and compaction of waste Best compaction at 10:1 (horizontal: vertical) Usual slope is 3:1 to reduce landfill surface area
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MSW landfill operations “Working face” = area of active waste placement Approximately 60-cm (2-ft) thickness of waste placed on slope Compacted by 2 to 5 passes of steel-wheel compactor (Compacting is lighter at bottom, near liner, to avoid puncture) Multiple lifts placed to complete a cell Cell is covered by 15 cm (6 inches) of daily cover
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Steel-wheeled compactor See image at the Web site of MSW Management Magazine, Bolton, N., Compactonomics, January/February 2000. http://www.forester.net/msw_0001_compactono mics.html . Accessed May 11, 2004.
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Waste density Residential waste at curbside 150 kg/m 3 After compaction in garbage truck 300 kg/m 3 (range: 180 to 415 kg/m 3 ) In landfill after compaction 590 to 830 kg/m 3 Typical soil (for comparison) 1,800 kg/m 3 (1.5 tons/yd 3 ) Source: McBean, E.A., F.A. Rovers and G.J. Farquhar, 1995. Solid Waste Landfill Engineering and Design . Prentice Hall PTR, Englewood Cliffs, New Jersey.
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MSW daily cover Materials: Usually soil Sometimes: shredded vegetation chipped wood compost spray-on proprietary mixes Cover-to-waste ratio is typically 1 to 4 for soil Substantial volume of landfill goes to daily cover!
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Spray-on daily cover See images at the Web site of Source: Emerald Seed and Supply, WASTE-COVER™ Landfill Mulch, http://www.emeraldseedandsupply.com/hydrose eding/mulch_wastecover.html . Accessed May 11, 2004.
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Purposes of daily cover Reduce moisture entering waste Most moisture enters waste during filling Control litter Reduce odors Limit access to rodents and birds Reduce fire risk Provide vehicle access to active face Improve aesthetics
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Liner systems U.S. EPA, 1989. Seminar Publication: Requirements for Hazardous Waste Landfill Design, Construction, and Closure. Report Number EPA/625/4-89/022. Center for Environmental Research Information, U.S. Environmental Protection Agency, Cincinnati, Ohio. August 1989.
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lecture17 - Lecture 17 Landfill operation and construction...

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