多洛米特溶解,pH中和,在雨水生物保留床中的潜在有毒元素固定
Abdullah Al-Amin1, Erica R McKenzie1
1Temple University, Department of Civil and Environmental Engineering, 1947 North 12(th) Street, Philadelphia, PA 19122, United States.
The Science of the total environment
|January 11, 2025
概括
多洛米特修正有效中和生物保留介质中的pH值,使潜在有毒元素 (PTE) 不动. 这提高了水质和生态系统的健康,尽管设计和水文是关键因素.
科学领域:
- 环境工程 环境工程
- 水质管理水质管理
- 土壤科学 土壤科学
背景情况:
- 在生物保留系统中,pH值至关重要,影响植物/微生物健康和潜在有毒元素 (PTE) 的去除.
- 杜洛米特修正案正在探索,以增强雨水下水处理中的pH中和PTE固定.
研究的目的:
- 调查多洛米特修改对生物保留介质pH中和的影响.
- 评估潜在有毒元素 (PTE) 的后续固定.
- 评估流入条件和运行时间对这些流程的影响.
主要方法:
- 工程生物保持介质经过修改,具有不同的多洛米特比率.
- 实验室批量和1D列实验模拟生物保留条件.
- 随着时间的推移,分析pH,溶解/孔水中的Mg,Ca和PTE度.
主要成果:
- 在批量实验中观察到的快速pH中和 (pH 5-8在5分钟内).
- 在列研究中,间歇性流入显示了更高的Mg和Ca,表明多洛米特溶解更大.
- 随着时间的推移,PTE度 (Mn,Fe,Zn,Cu,Pb,Cd) 一般会下降,除了 (As) 在pH值8.
- 多洛米特岩的溶解在一个月内是相当大的,并持续到第二个月.
结论:
- 多洛米特修正有效中和pH,并在生物保留介质中固定大多数PTE.
- pH 中和和 PTE 固定受土壤与多洛米特的比率和水文因素 (流量,周期,接触时间) 的影响.
- 多洛米特修正案是雨水管理的一个有希望的策略,但生物防护设计和水文学需要仔细考虑,特别是关于As的去除.
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