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1、1EnvironmentalscienceandengineeringAmosThomasDemonTEAM:4082021/8/29Thesearetheidealenvironment thatwedreamtolivein.2021/8/29Wakeup! Thesearetheenvironmentweliveinnow!2021/8/29pollutionsWaterpollutionWaterpollutionisthecontaminationofwaterbodiessuchaslakes,rivers,oceans,andgroundwater.Waterpollu
2、tionTheheavysmokepipedfromthefactorychimneys.AirpullutionAutomobileexhaustThenoisepollutionTherubbishweproducedTheWhitepollutionInmywordsTheenvironmentistheworldwelivein,andthenaturalsurroundings.Everytimewespreadourcitys,everygarbageweproduce,everydropofwaterwepollute，wehurtour“mothernature”.W
3、erelyontheEarthforeverythingweneedtosurvive,solet’stakecareofit.Wecan’tlivewithoutwater,butnowthewaterwaspolluted.Itisthebiggestproblem.Itinfluencesourdailylife.Soweshouldfindawaytosolvethisproblem.14WaterTreatmentProcesses15WaterTreatment16Watertreatmentoperationsfulfilloneorthreekeytasks:remo
4、valofparticulatesubstancessuchassandandclay,organicmatter,bacteria,andalgae;removalofdissolvedsubstancessuchasthosecausingcolorandhardness;andremovalordestructionofpathogenicbacteriaandviruses.Theactualselectionoftreatmentprocessesdependsonthetypeofwatersourceandthedesiredwaterquality.水处理操作完成一个
5、或三个关键任务：去除颗粒物如沙粒和粘土、有机物、细菌和藻类，去除溶解物质如那些产生颜色和硬度的，及除去或消灭致病细菌和病毒。处理工艺的实际选择依赖于水源的类型和水质要求。17Screeningtoremovelargesolidssuchaslogs,branches,rags,andsmallfishisthefirststageinthetreatmentofwater.Allowingsuchdebrisintothetreatmentplantcoulddamagepumpsandclogpipesandchannels.Forthesamereasons,waterinta
6、kesarelocatedbelowthesurfaceofthelakeorriverinordertoexcludefloatingobjectsandminimizephysicaldamagefromice.格栅是水处理的第一阶段，它能去除大块固体例如木头、树枝、破布和小鱼。这些垃圾进入处理厂会损害水泵并堵塞管道。同理，入水口设置在湖泊或者河流表面以下，以排除漂浮物并最小化冰块的物理破坏。18SedimentationSedimentation,theoldestandmostwidelyusedformofwaterandwastewatertreatment,usesgr
7、avitysettlingtoremoveparticlesfromwater.Itisrelativelysimpleandinexpensiveandcanbeimplementedinbasinsthatareround,square,orrectangular.Asnotedearlier,sedimentationmayfollowcoagulationandflocculation(forhighlyturbidwater)orbeomitte
