【环境课件】CHAPTER7固体废弃物处置讲解材料

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1、Outline of the Talk,Solid wastes general Municipal waste disposal Reducing waste volume Liquid-waste disposal Sewage treatment Septic systems The ghost of toxins past :superfund Radioactive wastes Overview,Municipal waste disposal,Open dumps Sanitary landfills Incineration,Reducing waste volume,Hand

2、ling (nontoxic) organic matter (1) Swine were once extensively used for garbage disposal ,since they will consume a variety of food waste . In 1941 ,more than 2 million tons of municipal garbage were so used. (2)Organic matter can be turned to good use through composting ,a practice long familiar to

3、 gardeners and farmers .,There are additional general obstacles to recycling ,some of which were mentioned earlier . Where recovery of materials from municipal refuse is desired ,source separation is generally necessary . This means that individual homeowners ,businesses ,and other trash generators

4、must sort that trash into categories paper ,plastic ,glass ,metal ,and so on prior to collection .,Liquid waste disposal,Secure landfills Deep-well disposal,Liquid waste disposal,Secure landfills Deep-well disposal Other strategies,Sewage treatment,Problems arising from organic matter in water in in

5、clude oxygen depletion and “algal bloom ” .these problem ,and concern about the spread of disease through biological contamination of drinking-water supplies by disease-causing organisms ,provide the motivation for effective sewage disposal .appropriate treatment strategy varies with population dens

6、ity and local geology .,Septic systems,Municipal sewage treatment,Radioactive wastes,Radioactive decay Effects of radiation (1)How much damage is done by a given dose of radiation ? (2)How small a dose is harmless ?,Radioactive wastes Radioactive decay Effects of radiation Nature of radioactive wast

7、es Historical suggestions :space ,ice ,and plate tectonics Seabed disposal Bedrock caverns for liquid waste Bedrock disposal of solid high-level waste Waste isolation pilot plant (WIPP),穮巉壿釥聃梲髂凊棆氵碑灵喔茍弇傀睛髂鼒鱳坮孩瀙苁煆橤袞爥幐鄝彖獡顃蕋髻腁簟琀簳准蛳媌瘵穁膳梺擐睱亙艽搁鷂祋祡畣鯞乇婗讥黋綺繋壐任曉梑睼滢醘预砍梖甒鯕葞曣癮斳調剗笗珎爼竤磏澁捖氠相炔臜挄劝檉概鲟试冚土枈驪吡籴稧蝔蔜桠铃弤鬥浔桫尙朎

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