以安徽省合肥市某钢铁污染场地为例，采用SEFA工具计算和对比复合污染土壤异位组合修复方案的环境足迹.方案一：淋洗+化学氧化+水泥窑；方案二：稳定化+化学氧化+热脱附+异地填埋；方案三：生物降解+稳定化.结果表明，3种修复方案环境足迹存在一定差异.当重点关注能源和空气污染两个绿色可持续修复核心要素时，方案三环境足迹最小，能源消耗总量21808万MJ，温室气体（GHG）排放总量1.73万tCO2e；修复1m3有机污染土壤的环境足迹整体表现为化学氧化<生物降解<异位热脱附， 化学氧化、生物降解和异位热脱附三种修复技术的温室气体排放强度分别为0.05、0.09和0.17tCO2e/m3，能源消耗量分别为949.55，1677.54，3049.11MJ/m3.修复1m3重金属污染土壤时，异地填埋技术的环境足迹最小，能源消耗和温室气体排放最低；稳定化修复技术在空气污染物排放方面环境足迹最小.
Abstract
A study was conducted to analyze environmental footprints of heterotopic combination remediation schemes using SEFA (Spreadsheets for Environmental Footprint Analysis, EPA, version 3.0) algorithm at a steel contaminated site in Hefei, Anhui Province. Three schemes were included:(1) soil leaching + chemical oxidation + co-combustion in cement kiln, (2) stabilization + chemical oxidation + thermal desorption + remote landfill, (3) biodegradation + stabilization. Results showed significant differences in environmental footprints among the three remediation schemes. In terms of the green and sustainable restoration (GSR) elements, Scheme 3 yielded the smallest environmental footprint, i.e., energy consumption of 21808×104MJ and air pollution of 17,300tCO2 e. The overall environmental footprint of remediation of 1m3 of organic contaminated soil followed an order of chemical oxidation < biodegradation < thermal desorption, showing greenhouse gas emission as 0.05, 0.09 and 0.17tCO2 e/m3, and energy consumption as 949.55, 1677.54, 3049.11MJ/m3, respectively. For remediation of heavy metal contaminated soil, landfill caused the smallest environmental footprint in terms of energy consumption and greenhouse gases emissions. Regarding air pollutant emissions, stabilization remediation technology led to the smallest environmental footprint.
关键词
化学氧化 /
环境足迹分析 /
生物降解 /
土壤修复
Key words
biodegradation /
chemical oxidation /
environmental footprint analysis /
Soil remediation
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基金
国家重点研发计划项目（2022YFC3703301；2022YFC3703304）
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