کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
---|---|---|---|---|
4987635 | 1455275 | 2017 | 10 صفحه PDF | دانلود رایگان |
عنوان انگلیسی مقاله ISI
A pilot study on pressure retarded osmosis operation and effective cleaning strategies
ترجمه فارسی عنوان
یک مطالعه آزمایشی در مورد عملکرد اسمز معکوس فشار و راهکارهای پاک کردن موثر
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کلمات کلیدی
موضوعات مرتبط
مهندسی و علوم پایه
مهندسی شیمی
تصفیه و جداسازی
چکیده انگلیسی
A SWRO-PRO pilot was built to systematically investigate the osmotic power generation from state-of-the-art thin-film composite (TFC) hollow fiber membrane modules. For performance benchmarking, three feed pairs were examined. They were (1) synthetic brine and tap water, (2) real seawater reverse osmosis brine (referred to as SWBr) and tap water, and (3) real SWBr and wastewater retentate (referred to as WWBr) feed pairs. All feed pairs had the capabilities to produce power densities ranging from 5Â W/m2 to 5.7Â W/m2, which were obtained based on draw solution pressure and NaCl concentration of 15Â bar and 0.8Â M, respectively. These results were equal or more than the required power density of 5Â W/m2 proposed by Stafkraft. Various cleaning strategies at pilot level were adopted and proven to be effective and feasible to sustain module performance. Online cleaning approaches; namely, backwash, clean-in-place (CIP) and maintenance cleaning (MC) were performed to evaluate the cleaning efficiencies of the fouled membrane modules. The effectiveness of various cleaning agents was also evaluated using (1) tap water, (2) 200Â ppm HCl solutions at pHÂ 2.3 and (3) 200Â ppm NaOCl solutions at pHÂ 10.5. The results showed that for the case of SWBr and WWBr feed pair, acid maintenance cleaning was able to fully recover the water flux or power density, whereas caustic cleaning was only able to recover the water flux up to 80%. Chemical-free cleanings by backwash and CIP could only recover water flux from 42% to 51%. The introduction of intermittent CIP cleanings at a fixed interval was found to be effective in slowing down the water flux decline, thereby prolonging the operational duration.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 420, 15 October 2017, Pages 273-282
Journal: Desalination - Volume 420, 15 October 2017, Pages 273-282
نویسندگان
Esther Swin Hui Lee, Jun Ying Xiong, Gang Han, Chun Feng Wan, Qing Yu Chong, Tai-Shung Chung,