增强MgO的机制,通过CO2封存来稳定/固化Pb污染的红色粘土
Rulong Ban1, Fusheng Zha1, Bo Kang1
1School of Resource and Environmental Engineering, Hefei University of Technology, Hefei, 230009, China.
Journal of environmental management
|July 13, 2024
概括
增强二氧化碳的反应性氧化物 (MgO) 有效地固化了污染的红色粘土,显著增加了土壤强度和固定. 控制的碳化防止土壤扩张,提供低碳的解决方案.
科学领域:
- 地质技术工程 地质技术工程
- 环境科学 环境科学
- 材料科学 材料科学 材料科学
背景情况:
- 被污染的土壤对环境和健康构成危险.
- 反应性MgO对土壤固化有希望,但土壤类型影响碳化效应.
研究的目的:
- 评估二氧化碳增强反应性MgO对Pb污染的红粘土工程和环境性能的影响.
- 为了研究红色粘土中的碳化固化机制.
主要方法:
- 用CO2增强反应性MgO处理Pb污染的红色粘土.
- 分析土壤强度,pH值,电导率和Pb2+水.
- 研究矿物质变化和固化机制.
主要成果:
- 在1小时内,土壤强度增加了25倍以上 (达到>3MPa).
- 由于pH值升高 (9-10),Pb2+的固定化得到了促进,使液减少到<0.1 mg/L.
- 碳化将Pb2+转化为碳酸盐,通过沉,吸附和封装形成密集的结构.
结论:
- 增强二氧化碳的活性MgO对于固化Pb污染的红粘土是有效的.
- 最佳的碳化时间 (<1小时) 对于防止土壤膨胀至关重要.
- 这种方法提供了一种高效,低碳的方法,用于污染土壤的整治.
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