کد مقاله کد نشریه سال انتشار مقاله انگلیسی نسخه تمام متن
639613 1456194 2006 10 صفحه PDF دانلود رایگان
عنوان انگلیسی مقاله ISI
Influence of a nitrifying biofilm on local oxygen fluxes across a micro-porous flat sheet membrane
موضوعات مرتبط
مهندسی و علوم پایه مهندسی شیمی تصفیه و جداسازی
پیش نمایش صفحه اول مقاله
Influence of a nitrifying biofilm on local oxygen fluxes across a micro-porous flat sheet membrane
چکیده انگلیسی

Experiments were designed to characterize the oxygen transfer across a micro-porous, flat-sheet membrane with and without a nitrifying membrane-aerated biofilm (MAB). Clean membrane oxygen transfer was quantified via average mass transfer coefficients and local fluxes calculated from profiles of dissolved oxygen (DO) along the membrane length. Stoichiometric calculations and DO profiles were used to characterize oxygen transfer with a nitrifying MAB. Comparison of the local fluxes with clean and biofilm coated membranes revealed that oxygen transfer was decreased in upstream sections of the membrane during cultivation of an MAB due to reduced advection and/or turbulence near the membrane surface. By contrast, oxygen transfer was increased in downstream sections of the membrane via bacterial respiration. Oxygen fluxes generally decreased in the downstream direction with biofilm coated membranes; however, variability in biofilm structure and membrane coverage altered this trend on several occasions. Furthermore, biofilm structures were observed to form via sloughing and settling of biomass at the membrane surface. This suggests that reactor configuration may have a significant influence on oxygen transfer rates in membrane-aerated biofilm reactors (MABR).

ناشر
Database: Elsevier - ScienceDirect (ساینس دایرکت)
Journal: Journal of Membrane Science - Volume 277, Issues 1–2, 1 June 2006, Pages 65–74
نویسندگان
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