A Study on the Improvement of Electric Current Efficiency by Modified Electro-deionization System

• Main Authors: Kai-Le Chu, 曲凱樂
• Other Authors: 張添晉
• Format: Others
• Language: zh-TW
• Published: 2007
• Online Access: http://ndltd.ncl.edu.tw/handle/z6j388

碩士 === 國立臺北科技大學 === 環境規劃與管理研究所 === 95 === EDI（Electro-deionization）is an innovation made of ultra pure water technology in present year. It is combined of electro dialysis and ion-exchange technology. Therefore, to overcome the drawback of electro dialysis, deep desalination and make up for ion-exchange technology can not continuously work and need chemicals to regenerate the ion-exchange resin, the superiority of those make this technology to be used more popularly and applied rapidly. EDI technology belongs to cost expensive operation system, because of long electricity distance and concentrate polarization phenomenon. Even already filled with ion-exchange resins in module to enhance the conductivity, it still consume a lot of energy, consequently, this study is focused to improve the module of electricity efficiency, for the purpose of enhancing the desalination efficiency and reduce the power consumption. The module in this study is self-designed, filled with materials that could enhance the electric conduction (eg. Active carbon), use different mode of filled, include non filled in the module, filled with ion-exchange resins at dilute compartment in the module, filled with active carbon at concentrate compartment in the module and ion-exchange resins at dilute compartment in the module. Used two index made by myself during the research to judge the results of this study, one is to observe the electric conductivity efficiency, another is for the promotion of electricity, the results showed the module filled with active carbon at concentrate compartment that electric conductivity is 99.7 %, another non filled in the module is 98.95 %, but the electricity conductivity is the same, the meaning of this is that, the module filled with active carbon at concentrate compartment is superior, but not remarkable for electricity conduction, maybe the reson is the experiment is batch recycle and can not imitate the real case that is continuous process, for this reason, compared with module filled with active carbon at concentrate compartment and non filled in continuous 7 hours operate situation, get module filled with active carbon at concentrate compartment superior to non filled on desalination efficiency and improve electricity efficiency in continuous operate situation, the experiment show the module filled with active carbon at concentrate compartment that electric conductivity 30∼31 μs/cm and better than the module with non filled 36∼37 μs/cm, the final current 0.243 A and 0.137 A respectively, inference that reduce electric conductivity at dilute compartment indeed and improve the electric efficiency.