第1页共82页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第1页共82页PART1INTRODUCTIONTOENVIRONMENTALENGINEERINGUnit1Text:EnvironmentalEngineeringWhatIsThisBookAbout?Theobjectiveofthisbookistointroduceengineeringandsciencestudentstotheinterdisciplinarystudyofenviroomentslproblems:theircauses,whytheysreofconcern,andhowwecsncontrolthem.Thebookincludes:?Descriptionofwhatismeantbyenvironmentsndbyenvironmentalsystems?Informationonthebasiscausesofenvironmentaldisturbances?Basisscientificknowledgenecessarytounderstandthenatureofenvironmentalproblemsandtobeabletoquantifythem?Currentstateofthetechnologyenvironmentalcontrolinitsapplicationtowater,airandpollutionproblems?Considerablegapsinourcurrentscientificknowledgeofunderstandingandcontrollingmanyofthecomplexinteractionsbetweenhumanactivitiesandnature?Manyenvironmentalproblemswhichcouldbeeliminatedorreducedbytheapplicationofcurrenttechnology,butwhicharenotdealtwithbecauseofsociety’slackofwilltodoso,orinmanyinstancesbecauseofalackofresourcestodoso.SomeImportantDefinitionsWheretheyarefirstusedinthisbook,definitionsareintroducedinblockform,asshownhere,orprintedinboldtype.Environmentisthephysicslandbiotichabitatwhichsurroundsus;thatwhichwecansee.hear,touch,smell,andtaste.System.accordingtoWehster’sdictionaryD,isdefinedas“asetorarrangementofthingssorelatedorconnectedastoformaunitororganicwhole;as,asolarsystem,irrigationsystem,supplysystem,theworldoruniverse”.Pollutioncanbedefinedasanundesirablechangeinthephysical,chemical,orbiologicalcharacteristicsoftheair,water,orlandthatcanharmfullyaffectthehealth,survival,oractivitiesofhumansorotherlivingorganisms.Whenthegoalofimprovingenvironmentalqualityistakentobeimprovinghumanwellbeing.theword“environment”broadenstoincludeallkindsofsocial,economic,andculturalaspects.Suchbroadnessisunworkableinmanyrealsituationsandimpracticalinatextbookdesignedforaone-semestercourse.Ourexaminationofenvironmentalproblemsisthereforelimitedbyourdefinitionof“environment”.InteractionofSystemsAnumberofdifferentenvironmentalproblemsareassociatedwithwater,air,orlandsystems.Manyoftheseproblemswillapplyonlywithinoneofthesesystems,justifyingthebreakdownintothesecategories.Suchaclassificationisalsousefulforeasiercomprehensionofrelatedproblemswithinonesystem.Moreover,itissensiblebecause,formanagerialandadministrativereasons®,suchsubfieldsasairpollution,watersupply,wastewaterdiaposal,andsolidwastedisposalareoftendealtwithseparatelybygovernmentalagencies.Unfortunately,manyimportantenvironmentalproblemsarenotconfinedtoanair,water,orland第2页共82页第1页共82页编号：时间：2021年x月x日书山有路勤为径，学海无涯苦作舟页码：第2页共82页system,butinvolveinteractionsbetweensystems.Acurrentexampleistheacidrainproblemstemmingfromtheemissionofsulfurdioxideandnitrogenoxidegasesintotheatmospherefromthestacksofgeneratingstations®,smelters,andautomobileexhausts.Thesegasesarethentransportedbyaircurrentsoverwideregions,Rainfall“washesthemout”,creatingacidrainwhichisharmfultoaquaticlife,forests,andagriculturalcrops.Twoexamplesofinteractionbetweensystemsthatcausemajorenvironmentaldisturbancesarepresented-thebuildupofatmosphericcarbondioxide,aglobalproblem.andtheacidrainproblem.normallyofregionalnature.EnvironmentalDisturbancesManymajorimprovementstoourstandardoflivingcanbeattributedtotheapplicationofscienceandtechnology.A...
