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Enhanced arsenic removal from water by mass re-equilibrium: kinetics and performance evaluation in a binary-adsorbent system
Water Research ( IF 12.8 ) Pub Date : 2020-11-24 , DOI: 10.1016/j.watres.2020.116676
Zhengyang Wang , Peng Liao , Xiaoqing He , Peng Wan , Bin Hua , Baolin Deng

Because arsenic (As) is highly toxic and carcinogenic, its efficient removal from drinking water is essential. Considering some adsorption media may adsorb As fast but are too expensive to be applied in a household, while others could be abundantly available at low cost but with slow uptake kinetics, we explored a novel mass re-equilibrium (MRE) process between two media with different adsorption characteristics to enhance the overall As removal. We employed an adsorbent with fast adsorption kinetics to grab As from water, and then allow it to transfer to a second adsorbent with large capacity for As retention. In the system containing two adsorbents separated by a dialysis membrane, the results showed that As associated with a fast-adsorbing iron-based ordered mesoporous carbon could diffuse to a slow-adsorbing but high-capacity iron-based activated carbon. Column tests were further conducted, showing that the mixed medium, composed of the two adsorbents, could be used to adsorb As at a very short empty bed contact time (≤ 1 min) and the removal was improved by the MRE that potentially redistributed solid-phase As during pump-off periods. This study points to a new direction that by the MRE process, novel binary-adsorbent approaches may be developed for contaminant removal, if suitable media and process configuration could be identified.



中文翻译:

通过质量再平衡增强从水中的砷去除:二元吸附系统中的动力学和性能评估

由于砷(As)具有剧毒和致癌性,因此必须有效地从饮用水中去除砷。考虑到某些吸附介质可能会快速吸附,但价格昂贵,无法在家庭中使用,而其他吸附介质可能以低成本提供,但吸收动力学较慢,因此我们探索了两种吸附介质之间的新型质量再平衡(MRE)过程。不同的吸附特性提高了整体砷的去除率。我们采用了具有快速吸附动力学的吸附剂,以从水中捕获As,然后将其转移至具有较大As保留能力的第二种吸附剂中。在包含两种被透析膜隔开的吸附剂的系统中,结果表明,与快速吸收的铁基有序介孔碳有关,它可以扩散到缓慢吸收但高容量的铁基活性炭。进一步进行了柱测试,结果表明,由两种吸附剂组成的混合介质可以在很短的空床接触时间(≤1分钟)内吸附As,并且MRE可以潜在地重新分布固体-相在抽空期间为。这项研究指出了一个新的方向,即如果可以确定合适的介质和工艺配置,那么通过MRE工艺,可以开发出新颖的二元吸附方法来去除污染物。可以在很短的空床接触时间(≤1分钟)内吸附As,MRE可以改善去除效果,因为MRE可能会在抽空期间重新分配固相As。这项研究指出了一个新的方向,即如果可以确定合适的介质和工艺配置,那么通过MRE工艺,可以开发出新颖的二元吸附方法来去除污染物。可以在很短的空床接触时间(≤1分钟)内吸附As,MRE可以改善去除效果,因为MRE可能会在抽空期间重新分配固相As。这项研究指出了一个新的方向,即如果可以确定合适的介质和工艺配置,那么通过MRE工艺,可以开发出新颖的二元吸附方法来去除污染物。

更新日期:2020-12-08
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