Investigation of a membrane bioreactor’s performances in treating sunflower oil refinery wastewater containing high oleic acid at different SRTs

Sharghi, E. Abdollahzadeh; Ghasemian, P.; Davarpanah, L.; Faridizad, G.

doi:10.1007/s00449-023-02923-z

Cited by 3 publications

(1 citation statement)

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“…important factor contributing to the stability of biological systems is biomass growth, which can be assessed by measuring MLSS and MLVSS. The MLSS concentration provides information about the presence of organic (including biomass and oily compounds) and inorganic matter in the MBR reactor(Sharghi et al 2023). Table3presents changes in the average concentration of MLSS and MLVSS, as well as the MLVSS/MLSS ratio in the MBR and EC-MBR systems with an SRT of 25 days and an HRT of 8 h. The initial average MLSS and MLVSS concentrations in the MBR process were approximately 4241 ± 158 mg L − 1 and 2121 ± 17 mg L − 1 , respectively, and after 38 days in steady-state conditions, it reached an average value of 8788 ± 172 and 5273 ± 68, respectively.…”

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confidence: 99%

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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confidence: 99%