کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
4481341 1623099 2015 11 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
High-rate MIEX filtration for simultaneous removal of phosphorus and membrane foulants from secondary effluent
موضوعات مرتبط
مهندسی و علوم پایه علوم زمین و سیارات فرآیندهای سطح زمین
پیش نمایش صفحه اول مقاله
High-rate MIEX filtration for simultaneous removal of phosphorus and membrane foulants from secondary effluent
چکیده انگلیسی


• A fixed-bed operation of MIEX attained the TP goal of <0.05 mg/L without coagulants.
• MIEX in a fixed-bed was effective at any of the EBCTs ranging from 0.4 to 6.3 min.
• Simultaneous decrease in fouling of MF/UF was also achieved with the MIEX treatment.
• The reduced fouling coincided with a nearly complete removal of organic acids.
• None of the examined pretreatment strategies removed HPI base/neutrals noticeably.

This work was designed to evaluate the effectiveness of magnetic ion exchange (MIEX) resin under the best possible conditions, passage through a fixed-bed of resin as opposed to the alternative of directly adding resin into a flowing stream. The possibility of using a very small amount of alum in addition to MIEX treatment was also investigated not only to adsorb residual EfOM in the effluent from a bed of MIEX but also to produce a porous cake layer that would keep away foulants from the surface of membrane or its pore walls. The MIEX treatment alone reduced fouling, but to a much lesser extent than for MIEX combined with an under-dosing coagulation (which uses a considerably low amount of alum). Almost all of colloids and organic acids were removed and the nearly complete removal of phosphorus was achieved by MIEX in a fixed-bed even for an extremely short hydraulic retention time of wastewater in the resin bed. MIEX resin removed phosphorus, but organic acids in EfOM were preferentially removed and the effects of competing anions on the removal of EfOM were insignificant. The MIEX treatment with added alum (only 0.5 mg Al L−1) dramatically improved the performance of MF and UF membranes and the subsequent membrane filtration also achieved ≤0.01 mg L−1 of residual phosphorous. This condition also allowed good flux recovery after hydraulic flushing.

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ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Water Research - Volume 69, 1 February 2015, Pages 40–50
نویسندگان
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