和活性污泥在和沙中的细胞外聚合物物质的运输和相互作用受离子强度和成分的影响
Qingling Meng1, Fuqiang Shi2, Peng Zhong2
1Key Laboratory of Songliao Aquatic Environment, Ministry of Education, Jilin Jianzhu University, Changchun 130118, China
概括
废水中的细胞外聚合物 (EPS) 增强了地下水充电系统中的重金属 () 运动. 离子组成,特别是,影响这种相互作用,对地下水质量构成风险.
科学领域:
- 环境科学 环境科学
- 地质化学 地质化学
- 微生物学 微生物学
背景情况:
- 人工地下水补充利用回收水来应对全球水资源短缺问题.
- 微生物细胞外聚合物 (EPS) 存在于废水中,但它们在重金属运输中的作用尚不清楚.
- 了解EPS-重金属相互作用对于评估地下环境中的风险至关重要.
研究的目的:
- 研究细胞外聚合物 (EPS) 对 (Cd) 在多孔介质中的迁移的影响.
- 确定离子组成和强度如何影响EPS和Cd之间的相互作用.
- 评估在地下水充电期间与EPS促进的重金属运输相关的环境风险.
主要方法:
- 使用热氧化从活性污泥中提取EPS.
- 进行了一维沙柱实验.
- 在不同 (Na) 和 (Ca) 离子度下分析了Cd和EPS相互作用的迁移.
主要成果:
- 在多孔介质中,EPS显著促进了 (Cd) 的迁移.
- Na+ 和 Ca2+ 离子都促进了 Cd 迁移和 EPS-Cd 复合,而 Ca2+ 的作用更为明显.
- 增加的Na+吸附比率降低了Cd迁移和EPS-Cd复合,表明在较高的Na+水平下具有保护作用.
结论:
- 在地下环境中,EPS在运输重金属 (如Cd) 中发挥着关键作用.
- Na+和Ca2+等离子的存在和度显著调节了EPS-Cd相互作用和移动性.
- 仔细考虑EPS和离子动态是管理地下水污染风险在人工充电再生水时至关重要的.
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