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在水处理过程中量化和表征主要的DOC分数:一种简化的SPE方法,不需要回收合化合物

Saeideh Mirzaei¹, Beata Gorczyca¹

¹Department of Civil Engineering, University of Manitoba, Winnipeg, Manitoba, Canada.

Water environment research : a research publication of the Water Environment Federation

|February 20, 2025

概括

一种新方法估计了没有复合物回收的溶解有机碳 (DOC) 分数. 水处理改变了DOC的特性,水友中性 (HPI) DOC显著影响紫外线吸收和消毒副产品的形成.

科学领域:

环境化学环境化学
分析水质分析水质
有机地化学有机地化学

背景情况:

特定的UV254吸收率 (SUVA) 用于表示疏水性 (HPO) 溶解有机碳 (DOC) 以评估去除效率和三甲形成潜力 (THMFP).
目前的分化方法,如固相提取 (SPE) 聚焦于合化合物,并假定处理不会改变DOC分量特征.
不一致的分化pH值和回收率使研究中的水友和HPO DOC组成的比较变得复杂.

研究的目的:

开发和验证一种新型的分化方法,用于估计主要的DOC分量 (性中性,总酸性,性中性),而无需回收化化合物.
研究pH对DOC分离的影响以及不同DOC分量的特征.
为了评估在传统水处理过程中DOC分量的数量和特征的变化.

主要方法:

使用SPE.测试了三种pH分离方法 (pH3,pH7,顺序调整)
开发了一种新方法来估计性中性 (HPIN),总酸性 (TA) 和性中性 (HPON) DOC 分数,而无需吸附化合物回收.
应用了新的方法来分析来自传统凝结/软化工厂的原料和处理水.

主要成果:

在pH 3和pH 7的SPE过物之间观察到DOC含量,SUVA和特定THMFP (STHMFP) 的显著差异,这归因于可电离的酸性DOC在较低pH下变为HPO.
水处理减少了HPON,但增加了HPI和TA分量的相对量.
与原水HPI DOC相比,处理过的水HPI DOC呈现出较高的STHMFP和较高比例的低分子量化合物.

结论:

开发的分化方法有效地估计了主要的DOC分数及其特征,而不需要吸收化合物回收.
水处理工艺显著改变了DOC分量的数量和特性,特别是增加了HPI DOC的贡献.
处理过的水中的HPI DOC在SUVA和STHMFP中比HPO分数发挥更大的作用.

关键词:

水友性有机物质是水友性的有机物质.分子质量分布分子质量分布特定的 UV254 吸收度三甲的形成潜力在水中溶解的有机碳

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