Impact of nitrogen loading rates on treatment performance of domestic wastewater and fouling propensity in submerged membrane bioreactor (MBR)

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• 作者：Sher Jamal Khan ; Shazia Ilyas ; Zohaib-Ur-Rehman
• 关键词：Nitrogen loading rate ; Submerged membrane bioreactor (MBR) ; Membrane fouling ; Extracellular polymer substance (EPS) ; Cake layer resistance
• 刊名：Bioresource Technology
• 出版年：2013
• 出版时间：August, 2013
• 年：2013
• 卷：141
• 期：Complete
• 页码：46-49
• 全文大小：470 K

文摘

In this study, performance of laboratory-scale membrane bioreactor (MBR) was evaluated in treating high strength domestic wastewater under two nitrogen loading rates (NLR) i.e., 0.15 and 0.30 kg/m³/d in condition 1 and 2, respectively, while organic loading rate (OLR) was constant at 3 kg/m³/d in both conditions. Removal efficiencies of COD were above 95.0 % under both NLR conditions. Average removal efficiencies of ammonium nitrogen (-N), total nitrogen (TN) and total phosphorus (TP) were found to be higher in condition 1 (90.5 % , 74.0 % , and 38.0 % , respectively) as compared to that in Condition 2 (89.3 % , 35.0 % , and 14.0 % , respectively). With increasing NLR, particle size distribution shifted from narrow (67-133 ¦Ìm) towards broader distribution (3-300 ¦Ìm) inferring lower cake layer porosity over membrane fibers. Soluble extracellular polymer substance (sEPS) concentration increased at higher NLR due to biopolymers released from broken flocs. Higher cake layer resistance (R_c) contributed towards shorter filtration runs during condition 2.