کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
623776 1455368 2013 7 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High water recovery in direct contact membrane distillation using a series of cascades
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
High water recovery in direct contact membrane distillation using a series of cascades
چکیده انگلیسی

Like all thermal processes, water recovery in membrane distillation (MD) is not limited by osmotic pressure, so that high recoveries are in principle achievable. The process can be carried out in batch recirculation mode or in continuous mode. In a number of earlier studies we have experimentally demonstrated very high water recovery in direct contact membrane distillation (DCMD) using cross flow hollow fiber membrane modules by operating in a batch recirculation mode without scaling seriously impairing membrane operation. However continuous operation is desirable for larger scale plants. Such operation may be carried out in a series of MD units each of which may consist of a countercurrent cascade of cross flow DCMD modules. A theoretical analysis of such a series of cascades has been carried out and expressions have been generated to show the relationship between recovery, temperature differences across and between the cascades, and the possible theoretical gained output ratio (GOR) and recoveries that are attainable. Depending on configuration (interstage heating or not) and temperature differences, recoveries of 60% and GOR values above 20 may be attainable. This could have important implications for the use of MD in the treating of desalination and other industrial brines.


► Direct contact membrane distillation (DCMD) has the potential for high water recovery in sea water desalination.
► A series of countercurrent DCMD cascades of two types has been theoretically investigated.
► It is preferable to use interstage heating of brine between each cascade.
► A GOR value above 20 may be attainable.

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 323, 15 August 2013, Pages 48–54
نویسندگان
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