对从电弧炉 (EAF) 废渣中分体浸出的测试方法的评估
Siyuan Yu1, Andrew C Garrabrants1, Rossane C DeLapp1
1Department of Civil and Environmental Engineering, Vanderbilt University, PMB 351826, Nashville, TN, 37235-1826, USA.
Journal of environmental management
|January 3, 2025
概括
对于电弧炉 (EAF) 渣缺乏标准化漏试验. 取决于pH值的液体-固体分区和柱体测试为在土壤应用中使用的EAF中释放的重金属的特征提供了更可靠的基线.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 材料科学 材料科学 材料科学
背景情况:
- 电弧炉 (EAF) 渣越来越多地被用作土壤修饰和表面聚合物.
- 这种广泛的应用引发了人们对重金属可能释放到环境中的担忧.
- 缺乏标准化的方法来描述EAF渣的漏行为,这阻碍了准确的风险评估.
研究的目的:
- 为了比较EAF渣的不同漏表征方法.
- 评估各种测试方法的适用性,包括单批提取和依赖pH的液体-固体分区 (LSP).
- 为环境决策制定关于EAF废渣再利用的基准表征方法.
主要方法:
- 三种EAF类型的总内容分析.
- 单批提取:毒性特征出过程 (TCLP),合成沉出过程 (SPLP) 和体外生物可访问性测定.
- 对细微 (<2毫米) 和摄入 (<250微米) 分数的评估.
- 与依赖pH的LSP曲线和透柱测试进行比较.
主要成果:
- 总含量分析确定了几个可能引起关注的成分 (COPC).
- 取决于pH的LSP表示Fe,Mn和可能Cr超过了土壤选水平.
- 大多数COPC在测试条件下达到平衡,但单批测试仅限于模拟条件.
结论:
- 单批提取试验的适用性有限,只反映了它们模拟的特定条件.
- 取决于pH值的液体-固体分区 (LSP) 曲线提供了更具代表性的漏行为评估.
- 推依赖pH值和透柱测试作为基线特性测试方法,以便在对EAF废渣再利用的环境决策方面做出明智的决定.
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