다양한 농도 공급원의 조합을 통한 역전기투석 장치의 성능 평가

초록

Salinity gradient power (SGP) has attracted significant attention because of its high potential.In this study, we evaluate reverse electrodialysis (RED) with various compositions of available resources. The polarization curve (I- V characteristics) shows linear behavior, and therefore the power density curve has a parabolic shape. We measure the power density with varying compartment thicknesses and inlet flow rates. The gross power density increases with decreasing compartment thickness and increasing flow rate. The net power density, which is the gross power density minus the pumping power, has a maximum value at a compartment thickness of 0.2 mm and an inlet flow rate of 22.5 mL/min. The power density in RED is also evaluated with compositions of desalination brines, seawater, river water, wastewater, and brackish water. A maximum power density of 1.75 Wm2 is obtained when brine discharged from forward osmosis (FO) and river water are used as the concentrated and the diluted solutions, respectively. © 2015 The Korean Society of Mechanical Engineers.

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