混合构造湿地中的甲基热点:机制和控制
Xiangzheng Li1, Yue Song1, Huancong Hao1
1Shandong Key Laboratory of Environmental Processes and Health, School of Environmental Science and Engineering, Shandong University, Qingdao 266200, China.
Journal of hazardous materials
|March 3, 2026
概括
建筑湿地 (CWs) 可以意外地增加甲基 (MeHg) 产量,带来风险. 人工设计的设施,如水,可以进一步放大处理过的水中的有害化合物.
科学领域:
- 环境化学环境化学
- 生态毒理学 生态毒理学
- 湿地科学 湿地科学
背景情况:
- 建筑湿地 (CWs) 对于水处理至关重要,但可以无意中增加甲基 (MeHg) 产量.
- 了解MeHg动态和人工系统的控制因素,特别是人类干预,如地下流CW (SSFCW) 和,至关重要.
研究的目的:
- 在混合CW系统 (SSFCW和自由水面CW - FWSCW) 中调查MeHg生产热点和机制.
- 评估特定配置,包括落水,对MeHg水平的影响.
主要方法:
- 在混合CW中分析了MeHg的产生和总 (THg) 的去除.
- 在SSFCW和FWSCW组件中确定了MeHg热点.
- 在不同的条件下,研究了滴水对MeHg度的影响.
- 相关的环境因素,如酸挥发性硫化物和微生物丰富度与Hg甲基化.
主要成果:
- 混合CW尽管去除了65.9%的THg,但作为净MeHg来源,MeHg增加了209%.
- 鉴于无氧和环保条件,SSFCW被确定为主要的MeHg生产热点.
- 降水显著增加了MeHg水平 (1.6-2.1倍),即使在有氧环境中.
- 酸挥发性硫化物和生物可用的Hg之间的负相关性,以及增加的Hg甲基化微生物,表明在水槽中增强了甲基化潜力.
结论:
- 混合CW可以成为净MeHg来源,SSFCW是关键的生产地点.
- 像落水堤这样的人工结构可以意外地放大MeHg的产生和释放在CW中.
- 这些发现突出了与CW设计和运营相关的生态风险,特别是接收水中的污染.
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