水的停留时间是溶解有机物组成和饮用水可处理性的重要预测因素
Mona Abbasi1, Mike Peacock2, Stina Drakare3
1Department of Ecology and Genetics - Limnology, Uppsala University, Uppsala, Sweden.
Water research
|June 20, 2024
概括
湖泊中的溶解有机物 (DOM) 正在越来越多地影响饮用水质量. 较长的水停留时间 (WRT) 会导致更多的水生DOM,通过颗粒活性炭 (GAC) 和生物处理改善其去除.
科学领域:
- 环境科学 环境科学
- 水的化学 水的化学
- 临界技术 临界技术
背景情况:
- 淡水生态系统对于饮用水至关重要,但溶解有机物 (DOM) 的增加会影响水质和水处理.
- 气候和人为因素导致水生系统中DOM和溶解有机碳 (DOC) 的升高,特别是在欧洲.
研究的目的:
- 用颗粒活性炭 (GAC) 和马拉伦湖的生物反应性来研究DOM可治疗性的空间和时间模式.
- 评估植物浮游生物,水化学,排水和气候等因素如何影响DOM组成,GAC去除和生物活动.
主要方法:
- 使用光学测量和Orbitrap质谱仪分析了DOM组成.
- 进行了为期14天的细菌呼吸化,以确定生物活性 (k率).
- 在2019年7月至2021年2月期间,在11个地点和6个时间点评估了GAC清除效率.
主要成果:
- GAC对DOM的可处理性从41%到87%不等,温暖的月份DOM更容易被去除.
- GAC可治疗性的关键预测指标包括双键等价值 (DBE),特定紫外线吸收率 (SUVA) 和新鲜度指数.
- 生物反应性 (k) 范围在0.04-0.71d-1之间,在更温暖的月份和更深的盆地更高,与新鲜的形DOM相关.
- 最长的水停留时间 (WRT) 与暂时稳定的DOM,更高的GAC去除效率和更高的生物反应性相关.
结论:
- 水的停留时间 (WRT) 对于塑造DOM成分至关重要,将其转向更多的水源,并提高饮用水的可处理性.
- 来自湖内过程 (植物浮游生物,细菌加工) 的DOM在光学上比陆地DOM更清晰,更容易去除.
- 研究结果强调了WRT在提供饮用水的大型湖泊系统中预测和管理DOM可处理性的重要性.
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