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نویسندگان مقالات پربازدید :
مجله مهندسی شیمی
جزئیات رویداد
همایش ، رویداد ، ژورنال
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  • osmosis-assisted cleaning of organic-fouled seawater ro membranes

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    جزئیات بیشتر مقاله
    • تاریخ ارائه: 1392/01/01
    • تاریخ انتشار در تی پی بین: 1392/01/01
    • تعداد بازدید: 611
    • تعداد پرسش و پاسخ ها: 0
    • شماره تماس دبیرخانه رویداد: -
     fouling of various kinds continues to limit membrane-based desalination and water treatment. fouling is commonly countered through chemical cleaning of membrane elements, resulting in process downtime, membrane degradation and increased operation costs. recent studies suggest that reversing permeate flux through ro membranes by dosing a slug of high salinity feedwater may offer an effective, chemical-free cleaning method. herein, seawater ro membranes were fouled using alginic acid as a model seawater foulant and cleaned by osmotic backwashing with draw solutions of different salt concentration and chemistries. flux recovery by osmotic backwashing was comparable with chemical cleaning (using caustic and a chelating agent); both recovered more flux than physical cleaning (rinsing with di water). in particular, results illustrate the importance of combining chemical and physical mechanisms, the former contributing to ‘loosening’ of the foulant layer, and the latter facilitating its removal through fluid shear, enhanced by the presence of an osmotic backflow. hence, osmotic backwashing may offer the potential for in-line, ‘low-chemical’ ro membrane cleaning, which would minimize discharge of cleaning chemicals to the environment and their impacts on ro membranes. numerical simulations of the osmotic backwash cycle illustrate important time-scales and mass transfer limitations governing osmotic backwashing, through which operational insight may be obtained. the model offers a possible theoretical approach for optimization of ro membrane cleaning by osmotic backwashing.

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