{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

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

Info icon This preview shows pages 1–3. Sign up to view the full content.

View Full Document Right Arrow Icon
1 Overview Ch. 21: Solid Waste – Landfills & combustion – Source reduction & recycling – Public policy & waste management 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 – Buried to reduce air pollution & vermin Finding sites – “Not in my backyard!” – Outsourcing •Or reduce/recycle •Or combustion • Problems – Leachate generation & groundwater contamination – 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
Image of page 1

Info icon This preview has intentionally blurred sections. Sign up to view the full version.

View Full Document Right Arrow Icon
2 – Geologically stable – Away from airports (bird hazards) Contoured floor – Leachate-collection system – Lined with plastic • Capped – 18 inches of earth & topsoil – Pyramid shape – Seeded Groundwater monitoring wells – Checked periodically, indefinitely Exercise 2 Think, Pair, Share
Image of page 2
Image of page 3
This is the end of the preview. Sign up to access the rest of the document.

{[ snackBarMessage ]}