著者

比嘉 充 藤井 将矢 岡川 直紀

出版者

日本海水学会

雑誌

日本海水学会誌 (ISSN:03694550)

巻号頁・発行日

vol.66, no.5, pp.242-247, 2012 (Released:2013-11-01)

参考文献数

17

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Salinity gradient power (SGP) is one of a renewable energy that is available when two solutions of different salinity mix. The global potential for SGP is calculated to be 2.6 TW when the flow of all rivers is taken into account. There are two membrane-based technologies that can change SGP into useful electricity ; reverse electrodialysis (RED) and pressure retarded osmosis (PRO). It has been shown that, in the case of river water with seawater, RED is a promising technology. The key components in a RED system are ion-exchange membranes (IEMs). Membrane requirements for RED are high perm-selectivity, low electrical resistance, safficent mechanical stability, high chemical stability, high anti-fouling properties and low cost. Here, the principle and technological trend of the system and IEMs for RED is presented.