温度作为PCE降解ZVI PRB应用中的关键驱动因素的重要性
Adrian D Metzgen1, Andreas Dahmke1, Markus Ebert1
1Department of Applied Geology, Aquatic Geochemistry and Hydrogeology, Institute of Geoscience, Kiel University, Ludewig-Meyn-Straße 10, 24118 Kiel, Germany.
Journal of contaminant hydrology
|September 3, 2023
概括
升高的地下水温度提高了使用零价值铁透反应屏障 (ZVI PRBs) 的化碳化合物修复. 适度加热 (高达40°C) 为地下水清洁提供了显著的材料节约和效率提升.
科学领域:
- 环境工程 环境工程
- 地质化学 地质化学
- 管理水资源 管理水资源
背景情况:
- 化碳化合物 (CHC) 污染对地下水资源构成重大风险.
- 零价值铁透反应屏障 (ZVI PRBs) 是现场地下水整治的成熟技术.
- 在矿化地下水中优化ZVI PRB性能需要了解温度依赖的降解动力学.
研究的目的:
- 为了研究地下水温度升高的潜力,结合ZVI PRBs,以加强CHC整治.
- 为矿化地下水中的ZVI PRB开发一种温度依赖的尺寸方法.
- 评估加热ZVI PRB系统的效率和材料节约.
主要方法:
- 使用两种类型的ZVI (Gotthart-Maier铁和ISPAT海绵铁) 与矿化地下水进行了柱体实验.
- 研究了四乙烯 (PCE) 降解在25°C至70°C的温度范围内.
- 确定了PCE和三乙烯 (TCE) 降解的速率系数和激活能.
主要成果:
- 对于两种ZVI类型,PCE降解速率系数随温度显著增加.
- 在40°C范围内加热的ZVI PRB系统显示出最高的效率,与10°C相比,提供55%~75%的潜在材料节约.
- 温度依赖的无氧铁腐蚀影响了矿物沉,铁表面被动化和孔隙性减少.
结论:
- 升高的地下水温度可以大大提高使用ZVI PRBs的CHC的整治.
- 适度的温度升高 (高达40°C) 代表了ZVI PRB系统在效率,可管理性和寿命之间的最佳平衡.
- 了解温度依赖的铁腐蚀机制对于设计有效和耐用的ZVI PRB至关重要.
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