Influence of membrane properties on fouling in submerged membrane bioreactors

Marel, P. van der; Zwijnenburg, A.; Kemperman, A.J.B.; Weßling, Matthias; Temmink, Hardy; Meer, W.G.J. van der

doi:10.1016/j.memsci.2009.10.054

Cited by 139 publications

(57 citation statements)

References 37 publications

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“…Low porosity leads to high local fluxes to and through the pores, even when global flux is still low. These results are in agreement with the ones obtained by van der Marel et al (2010) [7]. When testing membranes of different polymers on 0.02 to 3 µm in pore size, they also observed higher CFs for increased pore sizes.…”

Section: Filterability Performancessupporting

confidence: 92%

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Role of Surface Pores on Fouling of Polyvinylidene Fluoride Membranes in Submerged Membrane Bioreactors

Bilad

Druyts

Vankelecom

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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Abstract. In this study, the roles of surface pores on membrane fouling was investigated using three membranes in two lab-scale membrane bioreactors. Characterization of the pristine membranes revealed that increasing polymer concentration decreases pore sizes and porosity. Critical flux was found to decrease with decreasing pore sizes. The finding was consistent for both MBRs. The results of the long-term filtration were in agreement with the flux-stepping test. The fouling layer was easily removed and only a few small particles remained as were observed with scanning electron microscopy. Surface pore sizes and porosity declined for all cleaned membranes, indicating permanent pore blocking, and the effect was higher for membranes with larger pore size. IntroductionMembrane bioreactors (MBRs) improve the conventional activated sludge process (CASP) by replacing the settling tank with a membrane separation. Implementation of MBRs offers advantages, such as reduced plant footprint, lower sludge production, increased process control and improved effluent quality leading to a higher economical value of the effluent. Applications of MBRs gains favorability due to a more stringent effluent standard and the need of effluent reuse. However, the attempts to further decrease operating costs are still being developed, mainly acting on reducing fouling and so increasing process efficiency [1,2].Membrane fouling is the main drawback of MBR operation. It diminishes permeance reflected by an increase in the transmembrane pressure (TMP) when operating under constant flux or a decrease in fluxes when operating under constant TMP. To control fouling, three main approaches are generally followed: exploiting hydrodynamic conditions, improving favourable sludge properties and improving membrane properties. Fouling cannot be completely eliminated, so after a certain period of filtration (weeks, months) extensive cleaning of the membranes is still required and accumulation of permanent fouling will eventually lead to membrane replacement [3,4]. In this study, the effects surface pores of polyvinylidene fluoride (PVDF) membranes on the filtration performance and membrane fouling are investigated. The filterability was evaluated using critical flux methods and long-term filtration.

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Section: Filterability Performancessupporting

confidence: 92%

“…, respectively. After plotting the TMP vs time, the critical flux was not as obvious as found by others [7]. This is probably due to the poor accuracy of the analogue pressure gauges.…”

Section: Pristine Membrane Characteristicsmentioning

confidence: 55%

Role of Surface Pores on Fouling of Polyvinylidene Fluoride Membranes in Submerged Membrane Bioreactors

Bilad

Druyts

Vankelecom

2017

IOP Conf. Ser.: Mater. Sci. Eng.

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“…Spaghetti-like MWCNTs formed a porous structure and the entangled cross-linked fibrils offered a highly accessible surface area. The behavior of membrane fouling depends strongly on membrane surface characteristics such as membrane morphology and hydrophobicity [21]. Therefore, a variety of modification methods have been employed to improve the hydrophilicity and reduce the membrane fouling.…”

Section: Resultsmentioning

confidence: 99%

An ionic liquid-type multiwall carbon nanotubes paste electrode for electrochemical investigation and determination of morphine

Ensafi

Rezaei

Krimi-Maleh

2011

Ionics

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The direct electrochemistry of morphine on modified multiwall carbon nanotubes using carbon ionic liquid (i.e., 1-butyl-3-methylimidazolium hexafluoro phosphate, ([C4mim]-[PF6])) was studied. It was found that the electrode showed sensitive voltammetric response to morphine. The experimental results suggested that the modified electrode promoted electron transfer reaction for the oxidation of morphine. The electron transfer coefficient and charge transfer resistant (R ct ) of morphine at the modified electrode were calculated. Under the optimized conditions at pH 8.0, the peak current was linear to morphine concentrations over the concentration range of 0.45-450 μmol L −1 , using differential pulse voltammetry. The detection limit was 0.14 μmol L −1 . The proposed method was successfully applied to the determination of morphine in both ampoules and urine samples.

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“…However, many discrepancies are found, which limits in capturing general trends because of the diversity of experimental methods applied, varying test durations and the lack of proper membrane characterizations (Drews, 2010;Le-Clech et al, 2006). Nevertheless, a comprehensive study on the effect of membrane properties has been reported elsewhere (van der Marel et al, 2010). They concluded that an asymmetric membrane with an interconnected pore structure, hydrophilic properties, larger pore size and higher surface porosity favors less fouling.…”

Section: Membranementioning

confidence: 99%

“…Larger pores allow particles smaller than the pore size to clog the pore internally. A narrow pore size distribution prevents an inhomogeneous flow distribution between pores that would lead to preferential deposition and blockage of larger pores (Bilad et al, 2011;van der Marel et al, 2010).…”

Section: Pore Size and Distributionmentioning

confidence: 99%

Membrane bioreactor for domestic wastewater treatment: principles, challanges and future research directions

Bilad

2017

IJOST

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Membrane bioreactors (MBRs) have recently become widely accepted as an advanced technology for treatment of domestic and industrial wastewaters. The objective of this review is to provide overview on MBR technology for wastewater treatment application. It includes discussions on the fundamental, core problems (membrane fouling), recent effective development approach (dynamic filtration systems) and future research direction of MBRs. Since MBRs integrate a conventional activated sludge process with membrane filtration, and both fundamental aspects are discussed first. Later, a comprehensive discussion about membrane fouling, the main problems in MBR, is provided, including fouling control strategies. The discussion on the MBR membranes and relation between membrane properties and MBR performance is also provided. This review also includes one of the most promising MBR technologies that specifically design to manage membrane fouling: dynamic filtration systems. Lastly, insight into an approach to address MBRs challenges and recent research and developments are provided.

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Influence of membrane properties on fouling in submerged membrane bioreactors

Cited by 139 publications

References 37 publications

Role of Surface Pores on Fouling of Polyvinylidene Fluoride Membranes in Submerged Membrane Bioreactors

Role of Surface Pores on Fouling of Polyvinylidene Fluoride Membranes in Submerged Membrane Bioreactors

An ionic liquid-type multiwall carbon nanotubes paste electrode for electrochemical investigation and determination of morphine

Membrane bioreactor for domestic wastewater treatment: principles, challanges and future research directions

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