کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
627031 1455454 2009 8 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Membrane air flow rates and HF sludging phenomenon in SMBR
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Membrane air flow rates and HF sludging phenomenon in SMBR
چکیده انگلیسی
This paper sets out to characterize the sludging dynamics in a MBR hollow fibre system. Rates of sludge accumulation inside the membrane bundle and rates of sludge removal by aeration are evaluated in order to reach the optimal use of membrane aeration, avoiding any irreversible sludging. Experiments were performed in a submerged membrane bioreactor. Capillary membrane modules were placed on the outside of the bioreactor in a side stream position. Air was injected below each membrane module, ensuring vertical air lift circulation. During experiments, two air flow rates were compared (100 and 300 L/h). Some membrane air bubbling characteristics are described in terms of bubble size and bubble penetration inside the HF bundle. Results showed that membrane air flow rates appeared as a determining criterion to minimize sludging when filtering under intensive conditions (30 LMH permeate flux, 8-10 g/L TSS) with an air flow rate of 300 L/H allowing continuous functioning, and an air flow rate of 100 L/h which did not. Specific experiments to evaluate sludge removal rates from the HF bundle showed the high capacity of aeration to remove sludge from the HF bundles as soon as no dead zones appeared. These dead zones corresponded to local dried sludge accumulation (10-12% DM). The compactness of such dried deposit appeared non-reversible even when practising the higher 300 L/h membrane air flow rate, inducing a more intensive filtration condition in the working zone and more intensive irreversible sludging.
ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Desalination - Volume 236, Issues 1–3, 31 January 2009, Pages 135-142
نویسندگان
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