Bio36_21_SolidWaste - 1 2 1 2 3 1 2 4 6 1 2 7 1 Overview...

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1 Overview • Ch. 21: Solid Waste Danehy Park • North Cambridge, MA – 1950s: open, burning dump – Later: “sanitary landfill” closed in 1972 • Now – 4 soccer fields – 4 softball fields – 3 basketball courts – A baseball diamond – 2 playgrounds – A 2-mi. jogging trail • Increased Cambridge open space by 20% Disposal of Municipal Solid Waste • Municipal solid waste – Trash, refuse, garbage – All materials thrown away from homes, etc. and collected by local governments •Different from hazardous waste & nonhazardous industrial waste (7.6 billion tons, overseen by each state) • U.S. MSW – 1960: 2.7 lbs./person •Most burned in open dumps (dangerous) – 2007: 4.6 lbs./person •Disposable materials •Excessive packaging • Disposal goal – Environmentally responsible – Protective of human health Exercise 1 • Think, Pair, Share • Topic: How is most of the municipal solid wasted disposed in the United States? 1 2 1 2 3 1 2 4 Landfill Problems • Landfill waste • Finding sites – “Not in my backyard!” – Outsourcing •Or reduce/recycle •Or combustion • Problems – Methane production •“Gas wells” •Purified, used as fuel – Incomplete decomposition •Plastics don’t breakdown •Paper not damp – Settling Landfill Improvements • Location – High ground, above water table 6 1 2 7 1
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2 – Geologically stable – Away from airports (bird hazards) • Contoured floor – Leachate-collection system – Lined with plastic • Capped – Pyramid shape – Seeded • Groundwater monitoring wells – Checked periodically, indefinitely Exercise 2 • Think, Pair, Share • Topic: What do “gas wells” tap that is naturally produced within the landfill by the decomposition
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This note was uploaded on 01/12/2012 for the course BIOLOGY 36 taught by Professor Teresafinnern during the Fall '11 term at Riverside Community College.

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Bio36_21_SolidWaste - 1 2 1 2 3 1 2 4 6 1 2 7 1 Overview...

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