Disinfection-Dechlorination Battery for Safe Water Production,ACS ES&T Water

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Disinfection-Dechlorination Battery for Safe Water Production
ACS ES&T Water ( IF 4.8 ) Pub Date : 2021-08-05 , DOI: 10.1021/acsestwater.1c00207
Jeong-Sun Park _{1,

2} , Seohae Kim ₁ , Yunseok Choi ₁ , Ahmad M. Harzandi ₁ , Youngsik Kim _{1,

2}

Affiliation

With increasing population growth, it is necessary to meet safe water demands. Water disinfection through chlorination is the most commonly used method for safe water production. The electrolysis of salted water is a promising technology for the on-site generation of disinfecting agents, however, its low efficiency and inability to neutralize the remaining free chlorine makes electrolysis inefficient. The introduction of a cation permeable membrane between anode and cathode can help to improve the disinfection efficiency and also dechlorinate the remained free chlorine by switching the anode and cathode. However, the scale formation on the membrane will reduce the performance of the system. In this study, with using a Na-selective membrane for separating anode and cathode, we propose a disinfection-dechlorination battery (DD-battery) consisting of an anode for energy storage through Na⁺ reduction to metal Na and a cathode for disinfection via Cl^– oxidation to free chlorine species. The stored energy in the anode is released during discharge, and the system can dechlorinate the remaining free chlorine to prevent disinfectant toxicity. This self-disinfection-dechlorination during battery cycling can be combined with renewable energy sources for efficient water disinfection in remote regions.

中文翻译：

用于安全生产的消毒-脱氯电池

随着人口的不断增长，必须满足安全用水需求。通过氯化对水进行消毒是安全生产用水最常用的方法。盐水电解是一种有前景的就地生成消毒剂的技术，但其效率低且无法中和剩余的游离氯使得电解效率低下。在阳极和阴极之间引入阳离子渗透膜有助于提高消毒效率，并通过切换阳极和阴极来脱除残留的游离氯。然而，膜上的水垢形成会降低系统的性能。在这项研究中，使用钠选择性膜分离阳极和阴极，⁺还原为金属钠和阴极以通过 Cl 进行消毒^–氧化为游离氯物质。阳极储存的能量在放电过程中释放出来，系统可以对剩余的游离氯进行脱氯，防止消毒剂中毒。这种电池循环过程中的自消毒脱氯可以与可再生能源相结合，在偏远地区进行有效的水消毒。

更新日期：2021-09-10

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