基于环境足迹分析方法的石油烃污染场地土壤绿色修复技术评价应用研究

Research on the application of soil green remediation technology evaluation for petroleum hydrocarbon contaminated sites based on SEFA method

以杭州市某炼油厂地块为分析案例,运用国际广泛认可的环境足迹分析电子表格(SEFA)对3种土壤修复技术(生物堆、异位化学氧化和异位热脱附)的环境足迹进行量化评估。结果表明,对于案例地块修复,生物堆技术的能耗和碳排放量最低,分别为62.63×10^(4) MJ、32.83 t,其中碳排放的关键因素为柴油;异位热脱附的能耗和碳排放量最高,分别为321.37×10^(4) MJ、197.75 t,其主要碳排放来源为天然气。通过Entropy-TOPSIS法进行权重分析,将碳排放量纳入考虑后,3种修复技术中生物堆的排队指示值最高(0.5577),是案例地块土壤修复技术的最优选择。考虑到“双碳”目标和国际“碳关税”的双重影响,建议在未来污染场地土壤修复技术评估中,应将碳排放量纳入评分标准,研究结果可为选择技术可行、经济高效、环境友好、绿色低碳的土壤修复技术提供方法学和理论支持。

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 62.63×10^(4) 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 321.37×10^(4) 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(0.5577),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.