氰化物污染土壤修复工程环境足迹评估方法和案例研究

Environmental footprint assessment methods and case studies for cyanide-contaminated soil remediation projects

在界定评估边界、细化数据清单和系统构建评估流程方法的基础上,采用国际上广泛应用的环境足迹分析计算工具Spreadsheets for Environmental Footprint Analysis(SEFA),以山东某氰化物污染地块为例,基于实际获取数据,进行环境足迹的定量评价.结果表明,修复工程污染土方量74948m^(3),材料消耗量2249t,固废产生量4.19t,水资源消耗量2714m^(3),废水产生量2481m^(3),能源消耗量4274万MJ,温室气体(GHG)排放量为2463t CO_(2)-eq.原位化学氧化相对原地异位化学氧化的环境影响更小,去除每千克氰化物的能源效率和GHG排放强度分别为6415MJ/kg和339.11kg CO_(2)-eq/kg,约占异位化学氧化的25%.案例结果表明,SEFA能够快速、高效地定量评估氰化物污染修复工程的环境影响,上游原材料的使用导致的间接排放是环境足迹的主要来源,设备使用时长和材料用量是影响评估结果的关键参数.

Based on defining the evaluation boundary,refining the data list,and constructing a systematic evaluation process method,the internationally widely used Environmental Footprint Analysis and Calculation Tool(Spreadsheets for Environmental Footprint Analysis,SEFA)was used to quantitatively evaluate the environmental footprint of a cyanide contaminated site in Shandong Province.Results showed that the pollution volume of the restoration project was 74948m^(3),the material consumption was 2249t,the solid waste production was 4.19t,the water resource consumption was 2714m^(3),the wastewater production was 2481m^(3),the energy consumption was 42740000MJ,and the greenhouse gases(GHGs)emission was 2463t CO_(2)-eq.In situ chemical oxidation has less environmental impact than in situ ectopic chemical oxidation and the energy efficiency and GHG emission intensity of cyanide removal were 6415MJ/kg and 339.11kg CO_(2)-eq/kg,respectively,accounting for 25%of ectopic chemical oxidation.The study case results show that SEFA enables rapid and efficient quantitative assessment of the environmental impact of cyanide remediation projects.Indirect emissions from upstream raw material use are the main source of environmental footprint in the case,and the duration of equipment use and the amount of materials used are the key parameters influencing the assessment results.