A comprehensive study on the effects of electrocoagulation integrated in a membrane bioreactor treating sunflower oil refinery wastewater on treatment performance, biological properties, and fouling behavior

被引：0
作者：
Sharghi, Elham Abdollahzadeh [1 ]
Miri, Marjan [1 ]
Davarpanah, Leila [1 ]
Faridizad, Ghazale [2 ]
机构：
[1] Environmental Group, Department of Energy, Materials and Energy Research Center, Karaj
[2] School of Chemical Engineering, College of Engineering, University of Tehran, Tehran
来源：
Environmental Science and Pollution Research | 2024年 / 31卷 / 49期
基金：
美国国家科学基金会;
关键词：
Electrocoagulation; Membrane bioreactor; Membrane fouling; Particle size distribution; Sludge morphology; Sunflower oil refinery wastewater;
D O I：
10.1007/s11356-024-35106-8
中图分类号：
学科分类号：
摘要：
This study evaluated the effects of electrocoagulation integrated in a laboratory-scale membrane bioreactor (MBR), namely EC-MBR, on the treatment performance, activated sludge morphological characterization, and membrane fouling of MBR treating actual sunflower oil refinery wastewater. The EC-MBR system exhibited significantly higher chemical oxygen demand (COD) and oil and grease (O&G) removal efficiency compared to the MBR system. Additionally, both systems achieved excellent turbidity removal, with a percentage above 99%. The membrane fouling rate was higher in the EC-MBR system compared to the MBR system. Despite the decrease in the soluble microbial product (SMP) and extracellular polymeric substance (EPS) concentration in the EC-MBR system, especially their protein fraction, the significant increase in MLSS and carbohydrates/protein ratio, and the decrease in the mixed liquor and the cake layer particles size were the main membrane fouling factors. The membrane fouling resistance distribution showed that the EC-MBR system had a higher percentage of pore blocking resistance compared to the MBR. FTIR analysis identified a greater proportion of carbohydrate compounds in the cake layer of the EC-MBR system. SEM images revealed dense microbial clusters, mainly rod- and oval-shaped bacteria, in the EC-MBR system. Furthermore, EDX analysis detected elements such as Ca, K, O, Al, and P in both systems, with the EC-MBR system showing a higher Al content. The EC-MBR system showed low energy consumption (0.431 kWh m−3) and total operating costs ($0.90 m−3), showcasing its effectiveness and affordability for sustainable wastewater management. Graphical Abstract: (Figure presented.) © The Author(s), under exclusive licence to Springer-Verlag GmbH Germany, part of Springer Nature 2024.
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页码：59253 / 59274
页数：21
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