连续洗与热处理:在垃圾填埋场中获得的土壤类物质中处理重金属
Ingo Hölzle1, Mohit Somani2, G V Ramana3
1University of Augsburg, Universitätsstr. 2, 86159, Augsburg, Germany.
Journal of environmental management
|November 7, 2025
概括
垃圾填埋场采矿产生了污染的土壤状物质 (SLM). 顺序洗有效地减少了像As和Cr这样的重金属,而热处理在金属调动和固定方面有所不同,指导了安全的再利用策略.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 废物管理 废物管理
背景情况:
- 垃圾填埋场采矿产生大量类似土壤的材料 (SLM),需要进行处理以安全重复使用.
- 减少污染物,特别是重金属,对于SLM价值化和场外应用至关重要.
- 现有的研究往往侧重于SLM的表征和重复利用潜力,不太强调有效的污染物去除.
研究的目的:
- 为了比较连续洗和低温热处理在SLM中重金属减少的有效性.
- 在不同的处理条件下研究特定重金属 (As,Cr,Co,Ni,Pb,Cu,Zn,Cd) 的调动和固定行为.
- 根据目标金属和期望结果,提供数据驱动的洞察力,以选择适当的处理方法.
主要方法:
- 在多个循环中,用超纯水连续冲洗SLM.
- 在60°C至500°C的温度下对SLM进行低温热处理.
- 在每种处理方法之前和之后对重金属出和固定进行比较分析.
主要成果:
- 连续洗显著减少了As,Cr,Co和Ni的可漏分数,在早期循环中迅速减少,除了Pb.
- 在300°C的热处理调动了Co,Cr,Mn和Ni,而在500°C有效地固定了Cu和Pb.
- 七个洗周期在调动Cu,Zn,As,Pb和Cd方面优于300°C的热处理;热处理对Cu和Pb的固定优越.
结论:
- 顺序洗和热处理之间的选择取决于特定的重金属和目标 (移动移除或固定稳定).
- 连续洗是有效的减少可浸的重金属,特别是在早期的循环.
- 热处理根据温度提供不同的结果,具有动员和固定各种金属的潜力.
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