The application of membrane sequencing batch reactors in high rate activated sludge processes: the effect of the organic loading rate on the bioflocculation and fouling phenomenon

Shafaei, Nader; Bonakdarpour, Babak; Faridizad, Ghazale

doi:10.1039/d1ew00882j

Cited by 3 publications

(2 citation statements)

References 84 publications

(119 reference statements)

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“…It should be noted that, as mentioned earlier, metal particles act as absorbers and lead to EPS deposition and thus reduce EPS concentration (see section 3.2.4). Other studies have reported that SMPs are considered primary fouling-causing substances, and proteins, due to their heterogeneous properties, tightly attach to membranes, leading to decreased membrane permeability (Faridizad et al 2022;Shafaei et al 2022). The results of this study indicate that despite the reduction in SMP concentration and its components in the EC-MBR system, membrane fouling increased.…”

Section: Effect Of Eps and Smp On Membrane Foulingmentioning

confidence: 49%

“…All samples were ltered through a 0.45 µm membrane and subsequently analyzed for their protein and carbohydrate content. The concentrations of protein and carbohydrate in loosely bound EPS (LB-EPS), tightly bound EPS (TB-EPS) and SMP were analyzed according to the method described by Shafaei et al (2022). All analysis was performed in triplicate.…”

Section: Smp and Eps Extractionmentioning

confidence: 99%

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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

Sharghi,

Miri,

Davarpanah

et al. 2024

Preprint

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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 also showed that in the EC-MBR system, the pore blocking resistance percentage increased compared to MBR. According to FTIR analysis, the cake layer in the EC-MBR system had a higher carbohydrate compounds proportion compared to the MBR. The SEM images also reveal dense microbial clusters in the EC-MBR system, dominated by rod- and oval-shaped bacteria. EDX analysis detected Ca, K, O, Al, and P elements in both systems, with higher Al content in EC-MBR.

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Section: Effect Of Eps and Smp On Membrane Foulingmentioning

confidence: 49%

Section: Smp and Eps Extractionmentioning

confidence: 99%