Research on the application of soil green remediation technology evaluation for petroleum hydrocarbon contaminated sites based on SEFA method
Taking an oil refinery site in Hangzhou as a case study,this paper employed the internationally recognized Environmental Footprint Analysis Spreadsheet(SEFA)to quantitatively assess the environmental footprints of three soil remediation technologies:biopiling,ex-situ chemical oxidation,and ex-situ thermal desorption.The results indicated that for the remediation of the case study site,the biopiling technology exhibited the lowest energy consumption and carbon emissions,with values of 62.63 × 104 MJ and 32.83 t,respectively,where diesel was the key factor contributing to carbon emissions;whereas ex-situ thermal desorption had the highest energy consumption and carbon emissions,at 321.37 ×104 MJ and 197.75 t,respectively,with natural gas being the primary source of carbon emissions.The weight analysis conducted through the Entropy-TOPSIS method,taking carbon emissions into account,revealed that among the three remediation technologies,biopiling had the highest ranking indicator value(0.557 7),making it the optimal choice for soil remediation at the case study site.Considering the dual impact of the"dual carbon"goals and the international"carbon tariff",it was recommended that carbon emissions be incorporated into the scoring criteria for future assessments of soil remediation technologies at contaminated sites.This aims to provide methodological and theoretical support for the selection of technically feasible,economically efficient,environmentally friendly,and green low-carbon soil remediation technologies.
petroleum hydrocarbon contaminationbiopilingex-situ chemical oxidationex-situ thermal desorptionenvironmental footprintcarbon emissionsEntropy-TOPSIS method
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