Energy from Salinity Gradient of Wetland Saline Water Using Reverse Electrodialysis Membrane

Reverse electrodialysis (RED) membrane is an emerging renewable energy which harvest electricity from mixing two streams on different salinities. In real practice still not clearly defined for the effectiveness of salinity gradient power (SGP)-RED due to limitation artificial saline water. Generally, South Kalimantan Indonesia rich by wetland and coastal area. Due that water potential as sources collection SGP. This experiment aims investigate impact natural feed stream was collected Muara Halayung Kalimantan-Indonesia demineralized (WSW),artificial brackish (ABW) (0.35 wt %NaCl), seawater (ASW) (3.5 % NaCl) in terms density measured a lab-scale RED stack prototype 12 x cm. Ion exchange (IEM) used this work consisted cellulose modified Anion Exchange Membrane (AEM) EDTA-quaternization (EDC) process. Whereas, Cation (CEM) employing Nafion NR-212 with thickness 0.002 in. Lab-scale tests operated 3 hours into area system has 121cm2; AEM CEM have 100cm2; uses spacer nylon pair between membranes; electrodes stainless-steal copper. Feed then electrical separate ions CEM. The result among experiment, characteristic naturally had electro conductivity (EC) 135.6 µS/cm; TOM 15.2 ppm; ionic compound higher Na+ Cl- one potentially formed become system. highest process obtained mixed WSW:ASW 1.43 W/m2. While ratio WSW:ABW ABW:ASW were increasing 86% 1:5 1:30 effect