溶解有机碳对雨水生物保留系统中潜在有毒元素吸附的影响
Abdullah Al-Amin1, Robert J Ryan1, Erica R McKenzie1
1Temple University, Department of Civil and Environmental Engineering, 1947 North 12 Street, Philadelphia, PA 19122, United States.
The Science of the total environment
|November 26, 2023
概括
雨水排水中的溶解有机碳 (DOC) 通过减少它们与土壤的结合,增加了潜在有毒元素 (PTEs) 的流动性. 降低DOC水平可以帮助减轻PTE释放到环境中的影响.
科学领域:
- 环境化学环境化学
- 土壤科学 土壤科学
- 水的质量 水的质量
背景情况:
- 暴风雨水的排水带有溶解的有机碳 (DOC) 和潜在的有毒元素 (PTEs).
- DOC和PTE之间的相互作用影响PTE的物种化和移动性,但仍然不完全理解.
- 生物保留系统用于处理雨水排水,但从这些系统中释放的PTE需要进一步调查.
研究的目的:
- 调查不同溶解有机碳 (DOC) 度对从土壤生物保留介质中脱离10种潜在有毒元素 (PTEs) 的影响.
- 了解DOC如何影响雨水下水中PTE的流动性和物种化.
- 评估土壤深度在PTE吸附和脱吸中的作用.
主要方法:
- 土壤样本从一个有植被的生物保留床上收集.
- 实验是在0,15和50mg-C/L的DOC度下进行的.
- 测量了十种PTE (Mn,Fe,Co,Cu,Zn,As,Cd,Sn,Sb,Pb) 的溶解,并计算了土壤-水分布系数 (Kd).
主要成果:
- 增加的DOC度显著降低了大多数PTE的土壤-水分布系数 (Kd),表明移动性增加.
- 铜 (Cu) 的Kd随着DOC的增加而减少最多,而 (Sb) 的Kd减少最少.
- 表面土壤样本与深层土壤样本相比,具有较低的PTE吸附能力 (Kd较低).
- 脱吸的PTE的移动分数占PTE总量的<1.1%,但DOC减少了有机物和碳酸盐结合的PTE分数.
结论:
- 雨水排水中的溶解有机碳 (DOC) 通过减少它们与土壤的联系,提高了潜在有毒元素 (PTEs) 的流动性.
- 降低雨水排水中的DOC度是一种潜在的策略,以减轻PTE的环境释放.
- 了解DOC-PTE相互作用对于优化生物保留系统设计和管理以实现有效的雨水处理至关重要.
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