Chapter21

Chapter21 - Test on next Tue 8 April Consult first slide of...

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Test on next Tue 8 April Consult first slide of these lectures for major topics: Ch 8, 14, 15, 16, 19, 20, 21 Study Group? Meet in front at end of class OR Log onto Study4Test and leave your email
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Waste Production and Disposal After studying Ch 21, you should understand How cities generate pollution Solid waste disposal methods Ocean dumping Pros & cons of landfills vs . incineration Reuse > Recycling > Disposal Hazardous and toxic wastes Types of hazardous materials Disposal methods Federal legislation RCRA and CERCLA Legal, technological, & behavioral solutions to waste disposal problems
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Solid waste per house per year in US The average US household generates 1 bag of solid waste per day.
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Developed nations combined produce 3X more waste than all d’ing combined; some examples: ± US: 0.67 MT(1,500 lb) / person / yr ± EU: 0.33 MT (750 lb) / person / yr ± D’ing: 0.07 MT (150 lb) / person / yr Waste from agric > mining > industrial > municipal Crop residues, tailings, hazardous materials, dredge materials, garbage Growing at 4% per year! 70% Landfill, 16% Incinerate, 14% Recycle ~ 1% landfill in US is disposable diapers ± Excrement in diapers contaminates GW Excrement in diapers contaminates GW Solid waste around the world your house, the market, VCU, restaurants, offices, shops, …
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Mobro & Break of Dawn 1987 May 22 Returned to NY for incineration (finally occurred on 1 Sept) Ocean Dumping of garbage, dredge material, sewage, etc . ceased in US in 1992 9
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Waste Disposal Methods Open Dump predominant method of waste disposal in d’ing countries; illegal in US Landfill (a.k.a. Sanitary Landfill) predominant method of waste disposal in d’ed countries; excavate hole, fill w/ waste, cover daily; requires much land & much energy; produces CH 4 ; pollutes GW ( leachate ); land subsides when organic matter decomposes Incineration burn at very high temperature (1000 o C) When used to produce electricity (1T garbage = 1 bl oil) called a WTE (“waste to energy”) plant; a.k.a. “energy recovery” involves creating steam that is used for heating buildings or generating electricity; costs much more than Reusing or Recycling; produces toxic ash
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Sanitary Landfill Cells lined and covered daily CH 4
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Landfills Many states sell garbage to other states Suitable sites are becoming scarce Existing landfills are quickly reaching capacity Almost EVERYTHING EVERYTHING that goes into landfills could be recycled or composted
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For example: R ecycled or C omposted……….
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Chapter21 - Test on next Tue 8 April Consult first slide of...

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