资源回收利用.ppt

Thislessonisallaboutthepurposeorreasonforrecycling回收.Itsallaboutwaysinwhichwecanusenaturalresources/materialsagainandagain.Itsaboutthemanyproductswhicharefoundontheearthsomeofwhichonceusedwillneverreturn.,Question?Whendidwefirststarttorecycle?,Recyclinghasbeenacommonpracticeforabout2500years.Itbecamemuchmoremodernizedinthe19thand20thcenturies,Inthe21stcenturyithasnowbecomeawayoflifeallovertheworldincludingmanydevelopingcountriesDidyouknowthat:Theworldisfulloftwomainproductswhichareformedeithernaturallyoraremanmade.Whatarethey?,Renewable可更新的suchas:Glassmetal(steel)paper,plastic,andnonrenewable不可更新such:Naturalgas,crudeoil原油coal,Exercise:Trytogivemesomedefinitions定义orexplanationsofrecycling:,1)Usingnaturalormanmadeproductsagainandagain.2)Turningoldproductsintonewones3)Utilizing利用(using)mainlyoldproductsfromtheearthwhichcanbeusedmanytimes.,4)Recyclingisaprocess(method)ofusingoldmaterials(waste)intonewproductstopreventwastingpotentially潜在地usefulmaterials.5)Reducethecontinuedconsumption消费(using)offreshorrawmaterials新鲜的原料,Exercise:Givemereasonswhyweneedtorecycle?,1)Increasingglobalpopulation.2)Needformodernizationandtechnology.3)Theneedtoproducemorefood.4)Becauseofdeforestation森林开伐:cuttingdowntreesfor:a)Timber/woodb)makinghouses,c)furnitured)papere)furniture,f)firewood/cooking.5)Killinganimalsforfood,skins,oil,furs.,6)Topreserve(keep)whatisleftofthenaturalresourcesforgenerationstocome:forexample,Trees,plants,animals,forests,birds,freshwater,7)Sothatwedontdestroytheplanetortheworldinwhichwelive.8)Sothatwecanprotectournaturalhabitat自然栖息地9)Sothatourchildrencanstillwalkintheforestsandseetheanimalsandplantlifein100to200yearstime.,10)Becausethereisaheavydemandforclothes,textiles,transportation,medicine,education,industry,exploration.11)Becausetimeisrunningoutforhealthyliving.12)Theworldisbecomingmuchmoremodernandfaster.13)Becausewearedepleting消耗ournaturalresources.14)Becauseweareburningfossilfuels化石燃料.,Didyouknow:From1900to2000mostormanyoftherawornaturalproductsthatweusedonadailybasisnolongerexistsorisingreatdangerofrunningoutuntilweurgentlydosomethingaboutit:Thisisparticularaboutthenumber/quantityoftrees,animals,plantlifeandfreshwater.,Exercise:Pleasetrytonamesomeofthemanyproductsweuseintodaysworld.,waterpaperwoodplasticGasCoalfabric(textiles)stoneair/gaseselectronics,Rubber橡胶(tires)Leatherchemicals化学药品CrudeoilcookingornaturaloilanimalsBatteries(lithium锂/Duracell金霸王)glassPreciousorvaluablestonesormetals,Skins,bones,meatfromanimals.,Exercise:Canyounamesomeofthemetalswhichareusedintodaysworld:,1)StainlessSteel不锈钢2)Iron熨斗3)Copper铜4)Brass黄铜5)Aluminium6)Nickel镍7)Uranium铀8)Platinum白金9)Gold10)Silver,11)Silver12)Bronze青铜13)Zinc锌14)Magnesium镁15)Titanium钛16)Mercury水银,17)Lead领头位置,Exercise:nowgivemealistofnaturalormanmadeofAcids/Chemicalsweusetoday.,1)SulphuricAcid硫酸2)Nitricacid硝酸3)Hydrochloricacid盐酸4)Ascorbicacid抗坏血酸(vitaminC)5)Aminoacids胺酸(producedbythebody),Exercise:Nowgivemealistofsomeofthegaseswhichareusedtoday,1)Oxygen氧2)Hydrogen氢(alsocanbeliquidhydrogen液体氢usedforrocketsandspaceships)丙烷3)Nitrogen氮4)Propane(usedforcookers)5)Helium气体,6)Acetylenegas乙炔气(usedforwelding焊接法/fixingmetals)6)Butanegas丁烷气(usedforcigarettelightersandsmallercookers),Nowgivesalistofsomefuelswhichcomefromcrudeoil,1)Gasoline汽油(gas)/petrol2)Benzene苯3)Diesel柴油4)Lubricatingoil润滑油WD40.5)Unleadedpetrol无铅汽油,Nowgivemealistofsomefabrics纤维织物(textiles).,1)Cotton2)Nylon尼龙3)Polyester聚酯4)Rayon人造丝5)Wool6)Leather7)Syntheticleather合成皮带8)Cashmere开士米9)Fur10)Corduroy灯芯绒,11)Mink貂12)Suede绒面革,Canyounamesomecookingoilsorsaladoilsthatweuse:,1)Sesameoil麻油,usedmainlyforcooking2)Coconutoil椰子油usedmainlyinbakingcakes3)Cornoil玉米油forfrying4)Oliveoil橄榄油usedmainlyforsalads5)Cod-liveroil鱼肝油(usedmainlywhenyouareill)6)Sunfloweroil向日葵油forco