A Fuzzy-based Methodology for an Aggregative Environmental Risk Assessment of Restored Soil

(整期优先)网络出版时间:2014-02-12
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Environmentalriskspertainingtocontaminatedsoilshavebeenwellstudied,whilelittleattentionhasbeenpaidtotherisksofthesoilsafterremediation.Inthisstudy,aconceptmodeldevelopedbasedonfuzzysettheorywasappliedtoevaluatetheuncertaintiesofthreeriskindicators,namely,plantgrowth,groundwatersafetyandhumanhealth,ofarestoredsitethathadbeenpreviouslypollutedbyheavymetals.Theconceptmodelclassifiedthegradeandimportanceofriskfactorsbyan11-levelrankingsystemandwasabletoyieldacomprehensiveriskresultratherthanmulti-riskresultsforcomplexriskindicators.Modelingresultsshowedthattheriskstothethreeindicatorswereeffectivelyreducedaftertheremediation.Moreover,greatsensitivityoftheriskswasfoundrelatedtotheweightdistributionamongthethreeriskindicators.Ingeneral,therisksofbothpollutedandrestoredsoilstotheenvironmentwereintheorderofgroundwatersafety>plantgrowth>humanhealth.Themodelwasprovedtosolvetheproblemsofmulti-riskresultsduetocomplexriskindicatorsthatpreviouslyencounteredbyotherresearchers,whichmadeithelpfulindecision-makingandmanagementofrestoredsoils.