The use of membrane bioreactors in high rate activated sludge processes: How and why sludge retention time affects membrane fouling

Faridizad, Ghazale; Sharghi, Elham Abdollahzadeh; Bonakdarpour, Babak

doi:10.1016/j.jwpe.2022.102807

Cited by 17 publications

(4 citation statements)

References 51 publications

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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: 48%

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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: 48%

“…Membrane ltration resistances were calculated according to the method mentioned in the study of Faridizad et al (Faridizad et al 2022). The measurements of COD, SOUR, MLSS, and MLVSS were determined following the Standard Methods (Rice et al 2012).…”

Section: Additional Analysismentioning

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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“…found that the bound of EPS per biomass unit increase as the SRT decreased. Nevertheless, some other researchers observed that at a long SRT, the SMP and EPS concentrations were higher (Faridizad et al, 2022). Huang et al (2011) found that in short SRT, the microorganisms metabolized more actively, however less SMP were produced, which restricted biofilm growth and membrane fouling.…”

Section: Agjsrmentioning

confidence: 97%

Steady state modeling of autotrophic membrane bioreactor – a new approach to quantify biomass

Gasmi¹,

Heran²,

Elboughdiri³

et al. 2023

AGJSR

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PurposeThe main purpose of this study resides essentially in the development of a new tool to quantify the biomass in the bioreactor operating under steady state conditions.Design/methodology/approachModeling is the most relevant tool for understanding the functioning of some complex processes such as biological wastewater treatment. A steady state model equation of activated sludge model 1 (ASM1) was developed, especially for autotrophic biomass (XBA) and for oxygen uptake rate (OUR). Furthermore, a respirometric measurement, under steady state and endogenous conditions, was used as a new tool for quantifying the viable biomass concentration in the bioreactor.FindingsThe developed steady state equations simplified the sensitivity analysis and allowed the autotrophic biomass (XBA) quantification. Indeed, the XBA concentration was approximately 212 mg COD/L and 454 mgCOD/L for SRT, equal to 20 and 40 d, respectively. Under the steady state condition, monitoring of endogenous OUR permitted biomass quantification in the bioreactor. Comparing XBA obtained by the steady state equation and respirometric tool indicated a percentage deviation of about 3 to 13%. Modeling bioreactor using GPS-X showed an excellent agreement between simulation and experimental measurements concerning the XBA evolution.Originality/valueThese results confirmed the importance of respirometric measurements as a simple and available tool for quantifying biomass.

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“…10 The use of HL-MBRs in HRAS processes has been reported in some previous studies. 7,[11][12][13] Sequencing batch reactors (SBRs) have also been employed in HRAS processes. 6 In low rate processes, SBRs have shown some advantages relative to CAS, which include easy adaptation of cycle duration and HRT to various input circumstances and the lack of need for sludge recycling because sedimentation occurs under stationary conditions.…”

Section: Introductionmentioning

confidence: 99%

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

Shafaei¹,

Bonakdarpour²,

Faridizad³

2022

Environ. Sci.: Water Res. Technol.

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The use of membrane bioreactors in high rate activated sludge processes: How and why sludge retention time affects membrane fouling

Cited by 17 publications

References 51 publications

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

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

Steady state modeling of autotrophic membrane bioreactor – a new approach to quantify biomass

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

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