污水处理技术外文翻译.doc
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污水处理技术外文翻译.doc
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本科毕业设计外文文献及译文文献、资料题目:
StudyonDisinfectionandAntimicrobialTechnologiesforDrinkingWater文献、资料来源:
期刊文献、资料发表(出版)日期:
2001.1.9院(部):
专业:
给水排水工程班级:
姓名:
学号:
指导教师:
翻译日期:
2010.3.30-1-外文文献:
外文文献:
StudyonDisinfectionandAntimicrobialTechnologiesforDrinkingWaterZHUKun,FUXiaoYong(Dept.ofEnvironmentalEngineering,LANZhouRailwayUniversity,LANZhou730070,China)Abstract:
Disinfectionby-productsproducedbythereactionbetweenchlorineanddissolvedorganiccompoundsandotherchemicalsareconsideredasaworryingprobleminthedrinkingwatertreatmentprocesssinceaseriesofmutageniccarcinogensubstancesareformedincludingtrihalomethanes(THMs).Amongthetesteddisinfectants(chlorine,ozone,chlorinedioxide,potassiumpermanganate,chloraminesandhydrogenperoxideetc.),chlorinedioxidehasprovedtobethemostfeasibleandeffectiveoxidantfordrinkingwatertreatmentandremovalofpathogensduetoitsoxidationefficiency,lowcostandsimplewayofutilization.Aseriesofexperimentsindicatethatchlorinedioxidecansignificantlyrestrainproductionoftrihalomethanes(THMs)andcontrolbacteriagrowthparticularlyforCryptosporidiumoocysts.Theexperimentsverifiedthatbothozoneandchlorinedioxideareabsolutelyvitaltoensurethatanymicroorganismsarisingfromfecalcontaminationofwaterstoragearedestroyed.Thepaperdiscussesoxidationcapacityofchlorinedioxide,especiallyforremovingpetroleumcompounds,whichisaffectedbyreactiontime,gasinjectionway,andpHoftreatedwater.Keywords:
disinfection;oxidants;watertreatment;pathogens;chlorinedioxideCLCnumber:
X523Documentcode:
A1IntroductionChemicalandfiltrationprocessesaretwomainmethodsusedinChinafortreatingdrinkingwatermeanwhileUVradiationhasbeenusedsuccessfullyforwatertreatmentwithrelativelylowflowrate.Ontheindividualfamilylevel,usuallychemicaltreatmentisafeasiblealternative.Thefollowingguidelinesexistfortheselectionofsuitabledisinfectants:
thereactionmustbestrongenoughtoextinctbacteriaandcontrolgrowthofmicro-organisms,removalofcontaminantsshouldbedonebydecomposition,evaporationorprecipitationetc,toeliminateordecreasethetoxicity,oxidantsorreactionby-productsshouldnotbeharmfultohumanhealth,andthepurificationprocessesshouldbepracticalandeconomical.Theobjectiveofthispaperisto-2-evaluateanddiscussavailabledisinfectantsfordrinkingwatertreatment.Thedifferentdisinfectantsarecomparedregardingpurificationefficienciesandapplicationapproaches.2ComparisonofDisinfectantsDisinfectants,suchaschlorine,chloramines,sodiumhypochlorous,chlorinedioxideandozoneetc.,wereprimarilyconsideredindrinkingwatertreatment.Theoxidationcapacitiesoftheseagentsmayberankedasfollowsinorderofdecreasedefficiency1:
O3ClO2HOClOCl-NHCl2NH2ClReferringtoFiessingers2suggestion,thepropertiesofthesedisinfectantsarecomparedinTab.1.Chlorineisshowntobeanexcellentdisinfectanttopreventwaterbornediseasessuchastyphoidfeveroverlongperiods.Chlorinereactsnotonlywithinoxidation,butalsobyelectrophilicsubstitutiontoproduceavarietyofchlorinatedorganicby-products,particularlytrihalomethanes(THMs)andothermutagens.HereTHMsmainlyrefertochloroform,bromoform,dibromochloromathaneandbromodichloromathaneetc.Sincethe1970s,theusageofCl2indrinkingwaterdisinfectionhasbeenquestionedwithozonebeingsubstitutedasthepreferreddisinfectantinthewatersupplyplants.But,ozonecouldnotbeintroducedtotheruralfarmercommunityduetoitshighcostsandshorthalf-life(1520min.).Aswithotherdisinfectants,ozonationalsoleadstoformationoforganicby-productssuchasaldehyde,ketones,andcarboxylicacids,andalsomutagenicitymaybeinducedifbromicanionexists.Tab.1ComparisonofvariousoxidantsComparisonCl2ClO2O3KMnO4NH2ClH2O2THMformation+-Disinfectioneffects+-+-+Enhancedbiodegradability+-+Tasteremoval-+-+Ironandmanganese+-+Ammonia+-Formationofmutagensortoxicsubstances-3-+-+-+-+-+-noeffect;+littleeffect;+effect;+largesteffectManystudieshavepointedoutthatdisinfectionisabsolutelyvitaltoensurethatanymicroorganismsarisingfromfecalcontaminationofwaterstoragearedestroyed.Theselectionoftheavailabledisinfectantsmustconcerntoreduceriskfrommicrobialcontaminationofdrinkingwaterandthepotentialincreaseinriskfromchemicalcontaminationthatresultfromusinganyofthedisinfectants.Thebiocidalefficiencyofcommonlyuseddisinfectants-ozone,chlorinedioxide,chlorineandchloraminesarerankedalmostwiththesameorderastheoxidizingcapacity,butthestabilityofthosearefollowingtheorderas3:
ChloraminesChlorinedioxideChlorineOzone3PurificationoforganicpollutantsbychlorinedioxideAccordingtoWHOguidelinefordrinkingwaterquality,muchconsiderationshouldbepaidto
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