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燃煤发电厂燃烧过程中的Cd/Pb行为及其对土壤的时空影响:Cd/Pb同位素的新见解

Yafei Xia¹, Ting Gao², Yuhui Liu²

¹State Key Laboratory of Environmental Geochemistry, Institute of Geochemistry, Chinese Academy of Sciences, Guiyang 550081, China; National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China, Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management, Guangdong Institute of Eco-environmental Science & Technology, Guangdong Academy of Sciences, Guangzhou 510650, China; University of Chinese Academy of Sciences, Beijing 100049, China.

Journal of environmental sciences (China)

|September 21, 2024

概括

煤炭发电厂将 (Cd) 和 (Pb) 等重金属释放到环境中. 这项研究追踪了它们在土壤中的分散,揭示了风力模式和副产品再悬浮对土壤污染有重大影响.

科学领域:

环境科学环境科学
地质化学地质化学
污染控制污染控制

背景情况:

煤炭发电厂产生危险的重金属副产品 (Cd,Pb).
了解土壤中的重金属行为对于有效的污染控制至关重要.
这些释放的时空影响需要进行详细的调查.

研究的目的:

研究煤炭燃烧副产品,沉积物和土壤中的Cd/Pb度和同位素比率.
确定燃煤发电厂的重金属的分配机制和环境影响.
评估发电厂排放对周围土壤污染的贡献.

主要方法:

采集了粉碎燃料灰 (PFA),脱硫石膏 (DG),底层灰 (BA),沉积物和土壤的样本.
对 (Cd) 和 (Pb) 度和同位素比 (Δ114Cd) 的分析.
模拟用于重金属分布的两阶段凝结过程.

主要成果:

与料煤相比,PFA和DG的Cd同位素较重;BA的Cd同位素较轻.
一个两阶段的冷凝过程解释了Cd/Pb在排放中的分布.
风模式显著影响沉积分散,而土壤分布受风和副产品再悬浮的影响.
发电厂在NW-N-NE方向对土壤污染作出了重大贡献,即使是在很远的距离.

结论:

副产品中的Cd同位素有所不同,表明形成的途径不同.
在土壤形状中,Cd倾向于向下水,而Pb的变化反映了历史的除尘.
煤炭发电厂对周边偏远地区的土壤质量产生普遍影响.

关键词:

大气中的沉积沉积.煤炭燃烧燃烧煤炭的燃烧方式重金属的扩散是重金属的扩散.同位素分离的分化方法土壤污染土壤污染来源追踪追踪来源

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