The Hidden Engineering of Landfills

Summary by Krater

An explanation of landfill engineering, detailing how municipal solid waste is collected, compacted, managed for leachate and gas, and closed.

From the video

Answers: How do modern landfills work?

• Municipal solid waste management
• Landfill airspace
• Leachate collection and treatment
• Landfill gas extraction
• Daily cover and final cap systems

What it concludes

• Landfills mostly build up into air space rather than deep holes to avoid the water table and unsuited geology.
• Modern landfills use a bottom liner system consisting of an impermeable membrane or compacted clay to keep waste separate from underlying soils.
• Modern landfills have sophisticated leachate collection systems to keep waste as dry as possible and avoid groundwater contamination.
• Compaction using massive roller compactors with enormous teeth and giant blades saves money and space in landfills.
• Landfills require a final cover system of multiple layers of compacted soil, membranes, and fabrics to keep water out and contain gas and odors.