=Lecture 28 (Solid Waste Management) - students

4 landfill disposal federal standards location

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4. Landfill Disposal
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Federal Standards Location restrictions —ensure that landfills are built in suitable geological areas away from faults, wetlands, flood plains, or other restricted areas. Composite liners requirements —include a flexible membrane (geomembrane) overlaying two feet of compacted clay soil lining the bottom and sides of the landfill, protect groundwater and the underlying soil from leachate releases. Leachate collection and removal systems —sit on top of the composite liner and removes leachate from the landfill for treatment and disposal. Operating practices —include compacting and covering waste frequently with several inches of soil help reduce odor; control litter, insects, and rodents; and protect public health. 4. Landfill Disposal
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Federal Standards (continued) Groundwater monitoring requirements —requires testing groundwater wells to determine whether waste materials have escaped from the landfill. Closure and postclosure care requirements —include covering landfills and providing long-term care of closed landfills. Corrective action provisions —control and clean up landfill releases and achieves groundwater protection standards. Financial assurance —provides funding for environmental protection during and after landfill closure (i.e., closure and postclosure care). 4. Landfill Disposal
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Environmental Impacts of Landfills Effects to surrounding area Fugitive materials (e.g. plastic bags) Odor Noise Traffic Leachate generation High BOD and COD High nitrogen High salt Gas emission Green house gases: Methane and Carbon Dioxide Volatile organic compounds (VOC) 4. Landfill Disposal
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Source: Davis and Masten: Principals of Environmental Engineering and Science
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Landfill Design and Construction Site selection Public opposition Proximity to major roadway Local geology Zoning requirements Permit Process Engineering design Depth and height Barrier layers for groundwater protection Leachate collection system Gas collection system Final cover 4. Landfill Disposal
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Sanitary Landfill Drainage Layer Synthetic Liner Compacted Clay Liner Perforated Leachate Collection Pipe Leachate Collection Sump with Riser Ground Water Rainwater Retention Pond Moisture Barrier Layer Final Clay Cap with Vegetation Granular Drainage Material Stormwater Outlet Gas Collection Well 4. Landfill Disposal
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Sanitary Landfill Groundwater monitoring well Liner Leachate collection system Explosive gas monitoring well 4. Landfill Disposal
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Bottom Barrier Protect groundwater from leachate Use low permeability material Clay Geosynthetic Clay Liner (GCL) Geomembrane Reduce hydraulic gradient Require less than 12 inches of water above bottom liner Construct drainage liner (Geonet, gravel, sand) above the barrier Using bottom slope to move water into the collection system Leachate collection pipe network removing water to sump Leachate is pumped into storage tanks 4. Landfill Disposal
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Clay Layer Sand Layer Geosynthetic Clay Liner (GCL) Geomembrane Geonet Geotextile Leachate Pipe MSW 4. Landfill Disposal
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Cell Construction 4. Landfill Disposal
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  • Fall '15
  • Landfill, Municipal Solid Wastes, RCRA, landfill disposal

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