School of Water Conservancy and Environment, Key Laboratory of Water Resources and Environmental Engineering in Universities of Shandong, University of Jinan, Jinan, 250022, PR China.
School of Water Conservancy and Environment, Key Laboratory of Water Resources and Environmental Engineering in Universities of Shandong, University of Jinan, Jinan, 250022, PR China; Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Science, Chinese Academy of Science, No. 18 Shuangqing Road, Haidian District, Beijing, 100085, PR China.
Chemosphere. 2018 Nov;210:672-682. doi: 10.1016/j.chemosphere.2018.07.055. Epub 2018 Jul 12.
Natural organic matter (NOM) in aquatic environments have a significant impact on NOM-organic compound interactions, which could strongly affect the distribution and transformation of organic compounds during water treatment. This study focused on the removals of NOM (humic acid, HA) and synthetic organic matter (ibuprofen, IBP) through enhanced coagulation and magnetic ion exchange (MIEX) resin adsorption in single and bi-component systems. Two coagulants, traditional aluminum sulfate (AS) and lab-prepared polyaluminum chloride (PACl), were employed. The charge properties, particle size distribution, and fractal dimension (D) during organic matter removal were studied in both the single and bi-component systems to explore the purification behaviors and mechanistic effects of interactions between coagulants, MIEX, and organic matters. The experimental results indicated that the Al-based coagulants could remove over 80% of HA in both the single and IBP-HA combined systems, while the presence of HA could considerably improve the IBP removal rate. The aggregates formed during single-component coagulation were larger, but weaker and more loosely structured than those formed in the bi-component system under the same coagulation conditions. In the single-component system, the maximum removal efficiencies of IBP and HA by MIEX adsorption were 65% and 72%, respectively, at a resin dosage of 20.0 mL/L and mixing time of 60 min. Under the same conditions, the removals of these components in the bi-component system were improved to 68% and 98%, respectively. The reaction rate between IBP and MIEX resin was found faster than that between HA and MIEX resin.
天然有机物（NOM）在水生态系统中对 NOM-有机化合物相互作用有显著影响，这种相互作用会强烈影响有机物在水处理过程中的分布和转化。本研究聚焦于在单组分和双组分体系中，通过强化混凝和磁离子交换（MIEX）树脂吸附去除 NOM（腐殖酸，HA）和合成有机物（布洛芬，IBP）。使用了两种混凝剂，传统的硫酸铝（AS）和实验室制备的聚合氯化铝（PACl）。研究了在单组分和双组分体系中去除有机物过程中的电荷特性、颗粒尺寸分布和分形维数（D），以探究混凝剂、MIEX 和有机物之间相互作用的净化行为和机理效应。实验结果表明，在单组分和 IBP-HA 复合体系中，Al 基混凝剂均能去除超过 80%的 HA，而 HA 的存在可以显著提高 IBP 的去除率。在单组分混凝过程中形成的絮体较大，但比在相同混凝条件下的双组分体系中形成的絮体弱且结构疏松。在单组分体系中，MIEX 吸附对 IBP 和 HA 的最大去除效率分别为 65%和 72%，在树脂用量为 20.0 mL/L 和混合时间为 60 min 时。在相同条件下，双组分体系中这些组分的去除率分别提高到 68%和 98%。发现 IBP 与 MIEX 树脂之间的反应速率快于 HA 与 MIEX 树脂之间的反应速率。
