Enhanced energy recovery using a cascaded reverse electrodialysis stack for salinity gradient power generation.

摘要: Abstract Despite significant advances in the field applications of reserve electrodialysis (RED) to produce salinity gradient power, net energy production remains an issue owing limitations such as high requirement for flow rates feed solutions, and severe fouling pressure build up when thin spacers are used. Therefore, maximize performance efficiency harvesting RED, a cascaded RED stack, with multiple stages between anode cathode electrodes, was investigated. In stacks, 100-cell paired stacks were divided into several stages, so water flows first stage, effluent from stage then reused next stages. This stack could overcome typical drawbacks (large amount required, intensive pumping energy, low production). Although 25% volume used 4-stage (100-cell-pairs) compared conventional (100-cell-pairs parallel operation), much more produced stack. Net power density specific highest at 0.5 cm/s (0.48 W/m2) 0.25 (0.06 kWh/m3), respectively. is very promising practical application since volumes can be greatly reduced, which reduce burden on pretreatment step. Consequently, we compact plant smaller processes fewer unit stacks.