饮用水中的总有机素 (TOX):在饮用水处理过程中发生,相关性分析和前体去除
Rong Xiao1, Xu Yang1, Chao Fang1
1State Key Laboratory of Pollution Control and Resource Reuse, College of Environmental Science and Engineering, Tongji University, Shanghai 200092, China; Ministry of Education Key Laboratory of Yangtze River Water Environment, Tongji University, Shanghai 200092, China.
这项研究调查了长江三角洲饮用水中的总有机素 (TOX),在成品水中发现了高达165μg/L的水平. 处理过程显示,由于沙子过器的生物活性,夏季溶解有机碳和TOX前体的去除率更高.
科学领域:
- 环境科学 环境科学
- 水的质量 水的质量
- 公共卫生 公共卫生
背景情况:
- 总有机素 (TOX) 是饮用水中化消毒副产品 (DBP) 的关键指标.
- 长江三角洲面临着显著的人口密度,快速城市化和严重的水污染.
- 了解TOX的发生和形成对于确保安全饮用水至关重要.
研究的目的:
- 在长江三角洲的饮用水处理厂 (DWTP) 调查TOX的发生情况.
- 调查TOX形成潜力 (TOXFP),三甲形成潜力 (THMFP) 和水质参数 (DOC,UV254) 之间的相关性.
- 通过不同的水处理工艺来评估TOX前体的去除效率.
主要方法:
- 从长江三角洲的全尺寸DWTP收集了水样.
- 在成品水和模拟配电系统水中测量TOX水平.
- 分析了TOXFP,THMFP,DOC和UV254.4之间的相关性.
- 在不同处理阶段评估了TOX和THM前体的去除效率.
主要成果:
- 在DWTP废水中的TOX水平在29-165μg/L (中位数67μg/L) 之间;在配送系统中,101-276μg/L (中位数158μg/L).
- 在经过处理的水中 (R2=0.80) 观察到THMFP和TOXFP之间的更强的相关性,而不是原水 (R2=0.64).
- 处理效率按照以下顺序进行:UV254 > DOC > TOX前体 > THM前体.
- 与冬季相比,夏季观察到更高的DOC (59%) 和TOX前体 (54%) 的去除率 (39%和38%),这与沙的生物活性有关.
结论:
- 长江三角洲的饮用水显示出大量的TOX.
- 像DOC和UV254这样的水质参数是DBP形成潜力的有用预测指标,特别是在处理过的水中.
- 沙生物活性的季节性变化会影响有机物和TOX前体的去除.
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