Laxman Karthik, Sathe Priyanka, Al Abri Mohammed, Dobretsov Sergey, Dutta Joydeep
Functional Materials Group, Department of Applied Physics, School of Engineering Sciences (SCI), KTH Royal Institute of Technology, Stockholm, Sweden.
Nanotechnology Research Centre, Sultan Qaboos University, Muscat, Oman.
Front Chem. 2020 Aug 31;8:774. doi: 10.3389/fchem.2020.00774. eCollection 2020.
Clean water is one of the primary UN sustainable development goals for 2,030 and sustainable water deionization and disinfection is the backbone of that goal. Capacitive deionization (CDI) is an upcoming technique for water deionization and has shown substantial promise for large scale commercialization. In this study, activated carbon cloth (ACC) electrode based CDI devices are used to study the removal of ionic contaminants in water and the effect of ion concentrations on the electrosorption and disinfection functions of the CDI device for mixed microbial communities in groundwater and a model bacterial strain . Up to 75 % of microbial cells could be removed in a single pass through the CDI unit for both synthetic and groundwater, while maintaining the salt removal activity. Mortality of the microbial cells were also observed during the CDI cell regeneration and correlated with the chloride ion concentrations. The power consumption and salt removal capacity in the presence and absence of salt were mapped and shown to be as low as 0.1 kWh m and 9.5 mg g, respectively. The results indicate that CDI could be a viable option for single step deionization and microbial disinfection of brackish water.
清洁水是联合国2030年的主要可持续发展目标之一，而可持续的水去离子化和消毒是该目标的核心。电容去离子化（CDI）是一种新兴的水去离子化技术，已显示出大规模商业化的巨大潜力。在本研究中，基于活性炭布（ACC）电极的CDI装置用于研究水中离子污染物的去除，以及离子浓度对CDI装置对地下水混合微生物群落和模型细菌菌株的电吸附及消毒功能的影响。对于合成水和地下水，单次通过CDI单元可去除高达75%的微生物细胞，同时保持脱盐活性。在CDI电池再生过程中也观察到微生物细胞的死亡，且与氯离子浓度相关。绘制了有无盐分情况下的功耗和脱盐能力，结果显示分别低至0.1 kWh/m³和9.5 mg/g。结果表明，CDI可能是微咸水单步去离子化和微生物消毒的可行选择。
