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Comparison of organic matter removals in single-component and bi-component systems using enhanced coagulation and magnetic ion exchange (MIEX) adsorption
Chemosphere ( IF 8.8 ) Pub Date : 2018-07-12 , DOI: 10.1016/j.chemosphere.2018.07.055
Yingying Chen , Weiying Xu , Hongjian Zhu , Dong Wei , Ning Wang , Mengting Li

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 (Df) 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.



中文翻译:

使用增强混凝和磁离子交换(MIEX)吸附的单组分和双组分系统中有机物去除的比较

水生环境中的天然有机物(NOM)对NOM与有机化合物的相互作用具有重大影响,这可能会强烈影响水处理过程中有机化合物的分布和转化。这项研究的重点是通过增强单组分和双组分系统中的混凝和磁离子交换(MIEX)树脂吸附来去除NOM(腐殖酸,HA)和合成有机物(布洛芬,IBP)。使用了两种混凝剂,即传统的硫酸铝(AS)和实验室制备的聚氯化铝(PACl)。电荷性质,粒度分布和分形维数(D f)过程中,在单组分和双组分系统中研究了有机物去除过程,以探索凝结剂,MIEX和有机物之间相互作用的纯化行为和机理效果。实验结果表明,在单系统和IBP-HA组合系统中,基于Al的混凝剂均可去除80%以上的HA,而HA的存在可显着提高IBP去除率。在相同凝结条件下,单组分凝固过程中形成的聚集体比双组分系统中形成的聚集体更大,但结构更弱,结构更疏松。在单组分系统中,当树脂用量为20.0 mL / L,混合时间为60分钟时,MIEX吸附对IBP和HA的最大去除效率分别为65%和72%。在相同条件下 双组分系统中这些组分的去除率分别提高到68%和98%。发现IBP和MIEX树脂之间的反应速率比HA和MIEX树脂之间的反应速率更快。

更新日期:2018-07-14
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