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Phytoremediationofcadmiumpollutioninsoil
環(huán)科1101李康楠11320120
Background
Soilheavymetalpollutionisreferstotheproportionofgreaterthan5metalsortheircompoundsinthesoilenvironmentcausedbypollution.Atpresent,theHgemissionsabout15000tonsperyearonaverage,3.4milliontonsofCu,Pb,5milliontonsofMn15milliontons,tenthousandtonsofNi100.Inourcountrybycadmium,arsenic,chromium,leadandotherheavymetalpollutionofcultivatedlandareaofnearly20millionhm2,about1/5ofthetotalcultivatedlandarea.1.Soilheavymetalpollutionsources
Heavymetalconcentrationsinsoilbythedualeffectsofthenaturalsoilconditionsandhumanactivities.Generally,undertheconditionoflowconcentrationofheavymetalsinnaturalsoil,butinrecentdecades,humanactivitiesgreatlycontributedtotheaccumulationofheavymetalsinsoil.PollutionofthesoilUnreasonableuseofagriculturalinputs
SolidwasteSewageirrigation
圖1土壤中重金屬污染來源Atmosphericnaturalsedimentationandprecipitation
Soilcadmiummainlycomesfromthefollowingaspects::Theharmofcadmium
Cadmiumisakindofgreymetal,insolubleinwater,thedensityof8.64g/cm3,meltingtemperature331.03℃,boilingpointof767℃.Metalcadmiumtoxicitywaslow.Butitschemicaltoxicityisverylarge.Cadmiuminhumanbodysavingseffect,latentlangbutfor10to30years.Itisreportedthatwhencadmiuminwatermorethan0.2mg/L,residentsdrinkingwaterforalongtimeandcontainingcadmiumsubstancesfromfoodintake,canleadto"bonepaindisease".Accumulationofcadmiuminsoil
Cadmiuminsoilaccumulationof0~15cm.InthesoilmainlyCdCO3,Cd(PO4)2andCd(OH)2.GiveprioritytowithCdCO3againamongthem.Duetocadmiumcan'tbeinthesoilmicrobialdegradation,half-lifemorethan20years,asaresult,thepollutionistheaccumulationoftheirreversibleprocess.Themobilityandtransferofcadmiuminthesoil
Heavymetalscadmium,onceintothesoillongstrandedinmagnetism.Becauseitmovesslowly,sodon'tusuallyongroundwaterpollution.Thepresenceofcadmiuminsoilmorphologyaredividedintowater-solubleandwater-insolublecadmium.Ioncdcl2,CD(no3)2,cdco3andcomplexingstatesuchasCD(oh)2iswatersoluble,migration,anddon'tplantabsorption,anddifficulttosolublecadmiumcompoundssuchascadmiumcadmiumsediment,colloidabsorption,noteasymigrationandforplantabsorption.Butincertainconditionscanbemutualconversion.3.3.1植物修復(fù)技術(shù)(phytoremediation)
Patienceandsuperaccumulationinplantsbasedonthetheoryofsomeorcertainpollutants,usenaturalgrowthorgeneticengineeringbreedingofplants,andremovalofenvironmentalpollutantsinenvironmentalpollutioncontroltechnology.Includingplantextracts,plantvolatileandplantstablethreeways.植物提取(phytoextraction)
Theuseofplantsasaccumulationofheavymetals(hyperaccumulatorsabsorbmetalcontaminantsfromthesoil,thenharvestabovegroundandforcentralizedprocessing,growtheplantsinarow,toachievethepurposeofreducingorremovingthesoilheavymetalpollution.植物揮發(fā)(phytovolatilization)
Itsmechanismistheuseofplantrootsystemtoabsorbmetal,turningitintogaseoussubstancesvolatileintotheatmosphere,inordertoreducesoilpollution.ThepresentstudymoreisaSeandHg.植物穩(wěn)定(phytostabilization)
Useafewplantstopromotetheprocessoftransitiontolowtoxicityofheavymetalsform.Inthisprocess,theheavymetalcontentofthesoilisnotreduced,justchangeform.圖1重金屬zn/cd超積累植物十字花科的天藍(lán)遏藍(lán)菜(thlaspicaerulescens)。圖2銅草(海洲香薷)4.PhytoremediationofsoilheavymetalpollutionresearchprospectsPhytoremediationhasirreplaceableadvantageinheavymetalpollutioncontrol,andinthegovernanceprocessofinsitu,governancecostslow,managementandoperationsimplicityandcompatibilityofenvironmentalaestheticsandincreasinglybroughttotheattentionofthepeople,andbecomeoneofhottopicsinthestudyofsoilbioremediation.Therefore,hasabroadapplicationprospect.Thefollowingaspectswillbethefocusofresearchinthisfield.4.1Superaccumulationplantselectionandcultivation
Superaccumulationplantisunderheavymetalstress,anadaptationofthemutanttendtogrowslowly,lowbiomass,climateadaptabilityisbad,haveverystrongenrichmentofspecificity.Therefore,screeningandbreedingofabsorptivecapacityisstrong,alsocanabsorbavarietyofheavymetalelements,andthebioremediationofbiomassofplantsisanimportanttask.Forgeneralrequirementsofaparticularheavymetalaccumulationplantstheabove-groundpartoftheheavymetalcontentisgreaterthanacriticalvalue(table1).元素CdNiPbCuZnMn臨界值1001000100010001000010000表1超積累植物重金屬含量臨界值
mg/kg-1
4.2Transgenicplants
Hasfoundthatmostoftheplantsasresourcesareinasmallrootshallow,biomassandthedisadvantageofslowgrowth,makeitsrepaircycleislong.Thismakestheengineeringapplicationofphytoremediationisrestricted,andthegeneticallymodifiedplantscanimproveitsapplicability.4.3Othermeasuresforstrengthening
Addingachelatingagent(suchasEDTA),cansignificantlyimprovetheactivityofmetalsinthesoilandpla
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