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标题：CASE STUDY ON NITRIFICATION RATES IN A NON-STIRRED MEMBRANE-AERATED BIOFILM REACTOR OPERATED UNDER LAMINAR REGIME
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作者：Judith Molina-Burgos ; Juan A. Jácome-Burgos ; Joaquín Suárez-López 等
期刊名称：Journal of Urban and Environmental Engineering
印刷版ISSN：1982-3932
电子版ISSN：1982-3932
出版年度：2017
卷号：11
期号：2
页码：193-201
语种：English
出版社：Universidade Federal da Paraíba
摘要：A lab-scale non-stirred membrane-aerated biofilm reactor with a volume of 14.2 L was operated under laminar flow regime with inorganic synthetic wastewater to assess tertiary nitrification rates. Nitrifying counter-diffusive biofilm grown over microporous polypropylene tubular membranes supplied with atmospheric air at low pressure (3.45 kPa). The reactor was operated at very low water-velocities (in cm/s): from 2.3×10 -4 to 2.3 × 10 -3 . In all runs, the influent ammonium concentration was kept constant (  26 mg-N/L). By changing the volumetric inflow, the membrane-aerated biofilm (MAB) was tested at seven different ammonium applied loads (range: 0.57 - 6.04 g-N/m 2 d). The corresponding ammonium removal rates ranged 0.56 to 3.02 g-N/(m 2 d). The percentage of biological ammonium removal presented a range from 50% to 98%. As expected, due to passive experimental dynamic conditions to achieve an ammonium removal percentage greater than 80% a hydraulic retention time of 19 h was required. Clean membrane oxygen transfer rate was evaluated. The nitrifying MAB was found to enhance the oxygen transfer across the membrane when the surface nitrification rates were high. A significant drop in electrical conductivity that is proportional to the ammonium removed was observed. Thus, conductivity measurement can be used as a simple control method of ammonium removal extent. Effluent suspended solids were not detected, therefore a sedimentation process was unnecessary.
其他摘要：A lab-scale non-stirred membrane-aerated biofilm reactor with a volume of 14.2 L was operated under laminar flow regime with inorganic synthetic wastewater to assess tertiary nitrification rates. Nitrifying counter-diffusive biofilm grown over microporous polypropylene tubular membranes supplied with atmospheric air at low pressure (3.45 kPa). The reactor was operated at very low water-velocities (in cm/s): from 2.3×10 -4 to 2.3 × 10 -3 . In all runs, the influent ammonium concentration was kept constant (  26 mg-N/L). By changing the volumetric inflow, the membrane-aerated biofilm (MAB) was tested at seven different ammonium applied loads (range: 0.57 - 6.04 g-N/m 2 d). The corresponding ammonium removal rates ranged 0.56 to 3.02 g-N/(m 2 d). The percentage of biological ammonium removal presented a range from 50% to 98%. As expected, due to passive experimental dynamic conditions to achieve an ammonium removal percentage greater than 80% a hydraulic retention time of 19 h was required. Clean membrane oxygen transfer rate was evaluated. The nitrifying MAB was found to enhance the oxygen transfer across the membrane when the surface nitrification rates were high. A significant drop in electrical conductivity that is proportional to the ammonium removed was observed. Thus, conductivity measurement can be used as a simple control method of ammonium removal extent. Effluent suspended solids were not detected, therefore a sedimentation process was unnecessary.
关键词：Membrane-aerated biofilm reactor; counter-diffusive biofilm; nitrification; biological wastewater treatment; electrical conductivity.
其他关键词：Membrane-aerated biofilm reactor; counter-diffusive biofilm; nitrification; biological wastewater treatment; electrical conductivity.