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1.
IntroductionBecauseofthelowefficiencyoftheelectrostaticprecipitator (ESP)forcollectingthesubmicronparticles ,theelectricalagglomerationmethodhasledtoanincreasinginterestinreducingtheemissionofthefineparticles .Manyauthorshavestudiedelectricalagglomerati…  相似文献   

2.
Informational uncertainties of risk assessment about accidents of chemicals   总被引:3,自引:0,他引:3  
IntroductionTheaccidentalriskassessmentofthechemicalsisafrontierscienceandtechnologyreferredtobothenvironmentalscienceandsafetytechnology .Inrecentyearsmanyresearchworkersinthisfieldhavedoneit.Theanalysisofchemicalaccidentsmainlyincludedthattheleakage…  相似文献   

3.
Agro-ecological engineering in China: a way towards sustainableagriculture   总被引:1,自引:0,他引:1  
IntroductionWithhighrateoftheworldeconomicgrowthinthiscentury ,manyunprecedented“ecologicalcrises” ,suchasdepletionofnaturalresources,environmentaldeterioration ,soilerosion ,decertification,andglobalchange,havebrokenoutallovertheworld .Manyevidencesindica…  相似文献   

4.
Naturalresources(landform ,geology ,hydrology,creature ,ecologyetc .) ,humanresources (culture ,economy,locationetc .)andlandscapeecologicalspatialstructureofacertainplacecandetermineitsdevelopmentpatternsandlandscapearchitectureaswellasitslimitationofdevelopm…  相似文献   

5.
IntroductionCleaningthefineparticlesinhightemperature (450℃ -950℃ )andhighpressureconditioncanenhancethethermalefficiencyofcleancoaltechnologiessuchasIGCCorPFBC .Rigidceramicfiltersofavarietyofstructuresareunderdevelopmentinprogramsaroundtheworld ,whichcanfi…  相似文献   

6.
1IntroductionLandscapeconnectivity,asoneimportantparametertodescribetheecologicalprocesesandecologicalfunctionsinlandscapeeco...  相似文献   

7.
IntroductionTheuseofwastewaterinagricultureisofsupremeimportanceinaridandsemi aridcountries.Insuchcountrieswaterisbecominganincreasinglyscareresourceandplannersareforcedtoconsideranysourceofwaterwhichmightbeusedeconomicallyandeffectivelytopromotefurth…  相似文献   

8.
IntroductionBeforethe 1 980sconventionaltreatmentprocessesofphenolswastewateraresolventextraction ,physicaladsorption ,chemicaloxidationandaerobicbiologicalprocess.Amongthebiologicalunitprocessesactivatedsludgeprocessismainone.Afterthe 1 980sanaerobicbiologic…  相似文献   

9.
IntroductionPhanerochaetechrysosporium (PC)isoneoftheunusualwhiterotfungithatitisabletomineralizethecompoundofnativelignin .Anditalsocandegradealmostallhazardousorganicpollutantsincludinggeneticmutagenicagentssuchaschlorinatedorganiccompounds,polycyclic…  相似文献   

10.
IntroductionRecognitionofmercuryasatrans nationalboundarypollutantandthediscoveryofthenegativecorrelationbetweenfishmercurylevelsandwaterpHanditsimplicationwithregardtoacidrainhavegeneratedalotofinterestinscientificresearchonenvironmentalmercuryconta…  相似文献   

11.
IntroductionRecently,someinstallationswithspecialconstructionforextractingcontaminantgas,suchasanexhausttoweroftheundergroundtunnel,etc.weresetupinurbanandindustrialcomplexareas.Theeffectsoftheseconstructionsontheflowandtherebyonthelocaldispersionoft…  相似文献   

12.
IntroductionThealuminosilicatesheetsofbentonitepossessanetnegativeelectricalchargecompensatedforbyinorganicexchangeablecations(e.g.,Na+andCa2+),whichstronglyhydratedinthepresenceofwater.Surfacepropertiesofnaturalbentonitecanbemodifiedbysimpleionexchangewi…  相似文献   

13.
IntroductionAerosolshavethepotentialtochangetheglobalclimatebecauseoftheirdirectradiativeeffectsandtheirindirecteffectsascloudcondensationnuclei.Aerosolsarealsoimportantcomponentsinbiogeochemicalcyclesandinheterogeneouschemistry ,whichcanaffecttrace ga…  相似文献   

14.
IntroductionTheuseofchemicals,includingpesticides,hasbecomeanintegralandeconomicallyessentialpartofmodernagriculture.Pesticide?..  相似文献   

15.
TheU .S .EnvironmentalProtectionAgencyrequestedtheNationalResearchCouncil(whichistheoperatingarmoftheU .S .NationalAcademyofSciencesandtheU .S .NationalAcademyofEngineering)tocarryoutacriticalscientificevaluationofindicatorstomonitorecologicalchangesfromeit…  相似文献   

16.
IntroductionRapidandsensitiveanalyticalmethodsforthedeterminationofmercuryandrelatedcompoundsinenvironmentalsamplesareimperativelydemandedsincevariouschemicalformsofmercuryinthenaturalenvironmentcanbehavedifferently ,therebyaffectingitsbiogeochemicalb…  相似文献   

17.
IntroductionThereisagrowingawarenesstotheimportanceofairpollutioninmajorcites.Anumberofstudieshaveshownthattheconcentrationsofcertaintraceelementsintheurbanatmospherehavebeenelevatedby pollution ,andtherefore ,thehighestconcentrationsofthesechemicalcont…  相似文献   

18.
IntroductionWatercontaminantsincludealargenumberofchemicalsrangingfromaromatichydrocarbons,organicsolvents,pesticidesandmetals.Heavymetalcontaminationiscommonlyfoundinareaswhereindustrialeffluentsaredischargedintonaturalwaters .Theharmfuleffectsofsuchm…  相似文献   

19.
1 IntroductionParticlesinnaturalwatersareoftentoosmalltobeeffectivelyremovedbytheseseparationtechniques.Theprocessofcoagulation/flocculationcausesfineparticlestoaggregateintolargerunits(flocs)whichcanbemoreeasilyseparated.Inwatertreatmentsaltsofalumi…  相似文献   

20.
IntroductionThehealthhazardsfromexposuretomercurydependonthestateofmercury whetheritisinorganic,inorganicormetallicform .Metallicmercuryistakenupbythelungsandexcretedthroughthekidneys,whilealkylmercuryistakenupbythebloodandcanpassthroughtheblood brainba…  相似文献   

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