AI Article Synopsis
- Pulsed electric fields (PEFs) were shown to effectively reduce mineral fouling and enhance electrodialysis (ED), especially with solutions high in magnesium and calcium.
- The study tested two PEF pause durations, comparing their impact on mineral solutions against direct current (dc) conditions at a consistent current density of 40 mA/cm².
- Results indicated that PEFs improved demineralization rates, lowered system resistance, and minimized fouling and energy use, with PEF ratio 1 (10s on/10s off) performing the best overall.
Article Abstract
Pulsed electric fields (PEFs), hashed modes of current consisting in the application of a constant current density during a fixed time (Ton) followed by a pause lapse (Toff), were recently demonstrated as an effective alternative for mineral fouling mitigation and process intensification during electrodialysis (ED) treatments. Recent ED studies have continuously reported a considerable mineral fouling formation on ion-exchange membranes, especially during the demineralization of solutions containing a high Mg/Ca ratio and a basified concentrate solution. The aim of this study was to evaluate the process performance under two different PEF conditions on a mineral solution containing a mineral mixture giving a high Mg(2+)/Ca(2+) ratio of 2/5. Two different pause-lapse durations (PEF ratio 1 (Ton/Toff 10s/10s); PEF ratio 0.3 (Ton/Toff 10s/33.3 s)) during consecutive ED treatments and their comparison with dc current were evaluated at a current density of 40 mA/cm(2). Our results showed that PEFs resulted in an intensification of ED process, enhancing the demineralization rates (DRs), reducing the system resistance (SR), and reducing the fouling and energy consumption (EC). PEF ratio 1 was the most optimal condition among the current regimes applied, leading to faster and higher demineralization rates due to a lower fouling and with low energy consumption during all consecutive runs.
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| http://dx.doi.org/10.1016/j.jcis.2011.05.044 | DOI Listing |
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