排污河道中重金属污染沉积物的植物修复

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1、博+学位沧文排污河道中重金属污染沉积物的植物修复PhytoremediationonHeavyMetalContaminantsinSewageRiverSediment一级学科：学科专业：研究生：指导教师：环境科学与工程环境工程李红霞赵新华教授天津大学环境科学与工程学院二零零八年五月ABSTRACTWiththewidelyuseofheavymetalanditscompoundsinflourishingdevelopmentofindustriesofmetallurgy,chemicalengineering，electroplatingand

2、printinganddyeing，theremediationandtreatmenttoheavymetalcontaminationhasbecomeaworld-wideenvironmentalproblembecauseoftheeverincreasingheavymetalcontaminantsintourbanriverandevenitspotentialdangertohumanbeings．Inordertoremediateheavymetalinurbansewageriversediment，plantingexperim

3、entandaddinghydrogenperoxidetreatingresearchwereconductedtOstudyphytoremediationoflead，cadmium，copper,zinc，manganeseandnickelinsedimentbyLoliummultiflorumandmaize．ResultsshowedafterplantingLoliummultiflorumthetotalconcentrationofheavymetalanddifferentformsofheavymetalcouldbechang

4、ed．Inaddition，theeffectofrhizosphere，microorganismandureaseactivityinsedimentcouldalsohelptouptakeandtranslocationtoheavymetalfromsedimenttoplants：Moreimportantwastheamountsandkindsofheavymetalordifferentformsheavymetalafteraddinghydrogenperoxidetreatingwerelargelychanged．Heavyme

5、talsinsedimentwereactivatedefficientlyandtheabilityofaccumulationandtranslocationtoheavymetalsincreasedfromsedimenttoplants．Throughtheresearchofuptakeandaccumulationofheavymetalindifferentpansofplant，resultsshowedtheroot，stemandleafhaddifferentphytoremediationmechanismtoheavymeta

6、l．Eventhoughextendingplantingtimecouldmaketheamountofheavymetalinplantincreased，efficiencyofremediationdecreaseddramatically．Thekindsandamountsoforganicsinsedimentchangedgreatly．Morerhizosphereexudatesandmicroorganismsalsohelpedtoincreaseaccumulationofheavymetalinplants．Theactivi

7、tyofpolyphenoloxidizehadbeenincreasedafterplantingandaddinghydrogenperoxidetreating．Theresearchfirstlyadvisedtheactivityofpolyphenoloxidizecouldbeconsideredasanimportantprooftojudgethephytoremediationeffectinsewageriversediment．Basedonthemechanicsofphytoremediationonheavymetalcon

8、taminantsinsewageriversediment，thefourdy