| کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
|---|---|---|---|---|
| 622668 | 1455300 | 2016 | 5 صفحه PDF | دانلود رایگان |
کلمات کلیدی
1. مقدمه
2. مواد و روش ها
شکل 1 دیاگرام شماتیک واحد اسمز معکوس و ژنراتور EMF.
جدول 1 ویژگی های غشای DOW FILMTEC™ TW30-1812-50 RO
شکل 2 پروفایل مقطع عرضی وکتورهای شدت میدان الکتریکی و مغناطیسی تولید شده، تامین شده توسط منبع AC در یک سولنوئید.
3. نتایج و بحث
شکل 3 تغییرات دمای جریان نفوذی در برابر زمان با و بدون EMF.
شکل 4 دوره ی زمانی دفع نمک با و بدون EMF.
شکل 5 دوره ی زمانی تغییرات سرعت جریان نفوذی با و بدون EMF.
شکل 6 تغییرات افت فشار غشایی در برابر زمان با و بدون EMF.
شکل 7 تصویر SEM (ولتاژ 20 کیلوولت و بزرگنمایی *2000) رسوبات تشکیل شده روی سطح غشا در طول فیلتراسیون: (1) غشای خام، (2) بعد از فیلتراسیون بدون EMF، (3) بعد از فیلتراسیون با EMF.
4. نتیجه گیری
• Investigating the effect of electromagnetic field (EMF) on membrane salt rejection, membrane pressure drop and deposits formed on membrane for the first time.
• Applying EMF on the surface of RO membranes significantly increased the performance of the membrane
• Applying EMF caused a delay in the formation of concentration polarization layers on the membrane surface
• Applying EMF increased the nucleation of anions and cations in the bulk fluid and created soft and powdery crystals
In the present study, the effect of electromagnetic field on the salt and water transport and reduction of carbonate deposit during reverse osmosis desalination was investigated. The electromagnetic field was generated by AC current through a solenoid wound around the membrane separation module. The current intensity and frequency was 25 A and 50 Hz, respectively. Experiments were conducted using CaCO3 solution at the concentration of 5.5 mmol/L. For comparison purposes, desalination by the membrane, in the presence and absence of an electromagnetic field was conducted. While the desalination process temperature was kept constant, the product temperature increased by less than 2 °C when the electromagnetic field was applied. The system performed sustainably when it was exposed to the electromagnetic field. During the experiments, salt rejection, permeate flow rate and membrane pressure drop were compared in the presence and absence of an electromagnetic field. Moreover, scanning electron microscopy (SEM) was used to investigate the morphology of the precipitates. It was found that the salt rejection and permeate flow rate increased when the electromagnetic field was applied. Furthermore, SEM analysis proved that CaCO3 precipitations formed in the presence of an electromagnetic field were in a powdery form with a lower density than the precipitation formed in case of not using electromagnetic field.
Journal: Desalination - Volume 395, 3 October 2016, Pages 41–45