Altın, Süreyya | Öztekin, Elif | Altın, Ahmet
Article | 2017 | Korean Journal of Chemical Engineering34 ( 8 ) , pp.2218 - 2224
Electrodialysis (ED) and electrodialysis reversal (EDR) processes have been often used for separation of ions in dilute solutions. In this study, the performance of ED and EDR processes has been examined in the removal of copper from the dilute solutions. First, applied voltage, initial concentration, flow rate, type of electrolyte and the effect of concentration were determined for both processes. Then, separation efficiency, current efficiency, energy requirement and material flux of the processes were calculated, and the performances of the processes were compared. The separation efficiency and energy consumption of EDR process w . . .ere higher compared to ED process under equal operating conditions. Also, the current efficiency (39.58%) of EDR process was lower than the current efficiency (67.46%) of ED process. It can be said that the ED process is more suitable in terms of energy consumption for separation in the low flow rate and concentration. © 2017, Korean Institute of Chemical Engineers, Seoul, Korea Daha fazlası Daha az
Altın, Süreyya | Gemici, Betül Tuba
Article | 2017 | FRESENIUS ENVIRONMENTAL BULLETIN26 ( 11 ) , pp.6438 - 6446
In this study, the performances of supported liquid membrane (SLM) and electrodialysis (ED) processes have been compared for separation of Cd (II) ions from aqueous solution. The operating parameters for the both laboratory-scale prepared processes have been optimized. The influence of operating parameters on the process performance has been established. Then separation efficiency, initial concentration and flux values of the processes optimized have been compared. The optimum initial concentration of the SLM process (75 mg/L) is higher than the optimum initial concentration of the ED process (5 mg/L). The separation efficiency of t . . .he ED process (85%) is higher than the SLM process (58%). As a conclusion, it has been established that the both processes deliver a significant separation performance for separating Cd(II) ions, however, ED Process is more efficient than SLM process for low initial concentration. SLM process is suitable for relatively high concentration and chemical selectivity Daha fazlası Daha az
Altın, Süreyya | Altın, Ahmet
Article | 2019 | Journal of Electrochemical Science and Technology10 ( 1 ) , pp.14 - 21
Supported liquid membrane process usually is used for recovering or enrichment of valuable metals in the industrial wastewater. But, even if the metals in the wastewater was separated with high chemical selectivity, it cannot be enough concentrated since separation performance of supported liquid membrane (SLM) process is limited by concentration gradient between feed solution and stripping solution. If metal concentration in the stripping solution to be enough low, transport of metal through membrane can be accomplishment constantly. Therefore, Electrodialysis (ED) has been placed after SLM process and the stripping solution of SLM . . . was used as the feed solution for the ED process. Transport of ions in the solutions is successfully performed by ED process. Thus, the metal concentration in the stripping solution does not rise as to stop ion transport. Besides, valuable metals easily are concentrated by ED process for re-use. In this study, effects of operation parameters like initial Cd(II) concentration, HCl concentration in the feed solution of SLM and applied voltage are investigated on separation efficiency, flux and permeability of the both processes. As the feed solution concentration increased, all performance values has increased. When initial concentration of 100 mg/L is used, separation performances (SP) are 55% and 70%, for SLM and consecutive process, respectively. The best HCl concentration in the feed solution of SLM has determined as 2 M, in this conditions SP are 64% and 72%, for SLM and consecutive process, respectively. With increased of applied voltage on ED process, SP of the consecutive process has been raised from 72% to 83%. According to the obtained experimental data, consecutive process has better separation performance than SLM. When the separation performances of both processes were compared for the same operating conditions, it was determined higher the separation efficiency, permeability and flux values of the consecutive process, 8%, 9% and %10.6, respectively. Consequently, the use of the consecutive process increases the performance efficiency of both processes. The consecutive process studied has quite a good chemical separation efficiency, and enrichment capability. Moreover, this process requires few water and energy. © 2019, Korean Electrochemical Society. All rights reserved Daha fazlası Daha az