在连续降雨状态下,对煤炭飞灰垃圾填埋场中的污染物流动性的实验和建模分析
Shuyuan Xu1,2, Yongbo Zhang3, Jiangbo Guo3
1Department of Geology and Surveying Engineering, Shanxi Institute of Energy, Taiyuan, 030600, China. tyutxsyuan@126.com.
Scientific reports
|January 22, 2025
概括
煤灰 (CFA) 泄漏物构成地下水污染风险,超过了诸如等元素的标准. 更高的压缩减少了流量,但污染物仍然可以迁移,需要改进的垃圾填埋.
科学领域:
- 环境科学 环境科学
- 地质技术工程 地质技术工程
- 水文地质学 水文地质学
背景情况:
- 煤炭飞灰 (CFA) 是中国重要的废物产品,经常用于垃圾填埋场回收.
- 来自CFA的液含有污染物,在长期储存期间可以污染区域土壤和地下水.
- 了解CFA垃圾填埋场的污染物迁移对于环境保护至关重要.
研究的目的:
- 调查来自中国山西省阳市发电厂的CFA的漏特性.
- 模拟CFA垃圾填埋场在运营早期和后期阶段的污染物迁移模式.
- 评估与CFA沉积物和土地回收项目相关的地下水污染风险.
主要方法:
- 使用压缩土壤和CFA进行了实验室规模,长期的土壤和灰柱漏试验.
- 模拟污染物迁移模式使用Hydrus-1D软件进行CFA垃圾填埋场运输计算.
- 分析了六种代表性元素/化合物在CFA液中的度,并将它们与地下水标准III类进行了比较.
主要成果:
- 在6个元素/化合物中,CFA液超过了地下水标准III级,其中 (Pb) 是最严重的 (标准的26.67倍).
- 增加了马兰和CFA的压缩,降低了液流量,并延迟了流动的开始.
- 在极端降雨的情况下,污染物在紧的土壤中迁移到56厘米,Pb (28厘米),Ni (23厘米),Cd (9厘米) 和Cr (VI) (5厘米) 的特定深度.
结论:
- 在CFA沉积物和土地回收场所附近存在地下水污染的重大风险.
- 马兰和CFA的较高压缩水平可以减少但不能消除污染物迁移.
- 减轻污染的建议包括使用压缩的马兰与地球合成材料或更厚的垃圾填埋层 (>1.5米).
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