Fouling characteristics of membrane filtration in membrane bioreactors

Thomas, Hugh; Judd, Simon; Murrer, John

doi:10.1016/s0958-2118(00)88959-4

Cited by 34 publications

(7 citation statements)

References 13 publications

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“…The sub-MBR is normally operated at lower flux and pressure with an adequate supply of coarse aeration to meet the oxygen requirements of the biomass and to mitigate the rate of cake layer formation on the membrane surface [74,113]. This condition of operation could considerably reduce the operational energy and the overall cost of MBR treatment application [114,115]. The membrane modules of this type of configuration are often taken out of the reactor when there is a need for chemical and/or mechanical cleaning [116].…”

Section: Submerged Configuration (Sub-mbr)mentioning

confidence: 99%

Treatment of Palm Oil Mill Effluent Using Membrane Bioreactor: Novel Processes and Their Major Drawbacks

Abdulsalam

Man

Idris

et al. 2018

Water

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Over the years, different types of alternative technologies have been developed and used for palm oil mill effluent (POME) treatment. Specifically, membrane bioreactor (MBR) has been employed to relegate pollutants contained in POME under different operating conditions, and the technology was found to be promising. The major challenge impeding the wider application of this technology is membrane fouling, which usually attracts high operating energy and running cost. In this regard, novel methods of mitigating membrane fouling through the treatment processes have been developed. Therefore, this review article specifically focuses on the recent treatment processes of POME using MBR, with particular emphasis on innovative processes conditions such as aerobic, anaerobic, and hybrid processing as well as their performance in relation to fouling minimization. Furthermore, the effects of sonication and thermophilic and mesophilic conditions on membrane blockage were critically reviewed. The types of foulants and fouling mechanism as influenced by different operating conditions were also analyzed censoriously.

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Section: Submerged Configuration (Sub-mbr)mentioning

confidence: 99%

Treatment of Palm Oil Mill Effluent Using Membrane Bioreactor: Novel Processes and Their Major Drawbacks

Abdulsalam

Man

Idris

et al. 2018

Water

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“…Since the feed concentration in mode 2 was low during the concentration step, as most of the permeable solutes were removed in the initial diafiltration step, fouling was minimized. Generally, fouling increases with the feed concentration under given operation condi- tions [40]. Two mechanisms of mass transport could affect the extent of fouling during UF.…”

Section: Resistance Analysismentioning

confidence: 99%

Membrane processing for purification and concentration of β-glycosidases from barley (Hordeum vulgare)

Hemavathi

Raghavarao

2011

Biotechnol Bioproc E

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Tangential flow ultrafiltration with a polyethersulfone (100 kDa) membrane was used for the purification and concentration of β-glycosidases (β-galactosidase and β-glucosidase) from aqueous extract of barley. The performances of mode 1 (concentration followed by diafiltration) and mode 2 (diafiltration followed by concentration) were compared. In mode 1 activity recoveries of 91.44 and 88% as well as purifications of 1.84 and 1.77-fold for β-galactosidase and β-glucosidase, respectively, were obtained in a total processing time of about 9 h. In mode 2 activity recoveries of 95.68 and 91.76% with purifications of 4.56 and 4.38-fold for β-galactosidase and β-glucosidase, respectively, were obtained in a total processing time of about 6 h. The removal of total carbohydrates and protein was 56.74 and 50.73%, respectively, in mode 1, whereas it was 81.46 and 79.04%, respectively, in mode 2. The diafiltration volume and volume concentration of 3 were maintained in both mode 1 and 2. Flux decline was severe in mode 1 and led to a long processing time of about 9 h. These results indicate that mode 2 was better than mode 1 for purification of β-glycosidases.

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“…MBRs can operate at a higher mixed liquor suspended solid (MLSS) concentration, which leads to a smaller reactor volume needed to treat the same wastewater [1]. However, membrane fouling is still a major obstacle for wider applications of MBRs.…”

Section: Introductionmentioning

confidence: 99%

Effect of on-line ultrasound on the properties of activated sludge mixed liquor and the controlling of membrane fouling in SMBR

Wang

Gong

2013

Desalination and Water Treatment

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A B S T R A C TMembrane fouling is one of the major obstacles for further application of submerged membrane bioreactors (SMBRs). In this study, a bi-frequency on-line ultrasound of 25 kHz and 50 kHz was applied to a laboratory-scale SMBR (SMBR-US) to investigate the alleviating of membrane fouling by ultrasound. Experiments were also carried out in another laboratory-scale SMBR without ultrasound (SMBR-Control). The properties of the activated sludge including mixed liquor suspended solids (MLSS), particle size distribution, viscosity, extracellular polymeric substances (EPS) contents and the total organic carbon (TOC) in supernatant were analyzed. The membrane filtration resistance was then calculated to identify the membrane fouling type in two reactors. During the experiment period, the transmembrane pressure of SMBR-Control system increased very fast compared with the SMBR-US system, indicating a significant mitigating of membrane fouling with on-line ultrasound. The MLSS concentration and mean particle size in SMBR-US system was apparently lower than that of SMBR-Control system, which deduced that the ultrasound can reduce extra sludge production and disintegrate activated sludge flocs in reactors. The mixed liquor viscosity in SMBR-US was consistently lower than that of SMBR-Control system. The MLSS and supernatant TOC played a significant role in membrane filtration of SMBR-Control system, while viscosity had an apparent relationship with the filtration resistance in SMBR-US system. The total membrane filtration resistance in SMBR-US was of 51.85% lower than that of SMBR-Control after 35 days operation, which confirms that the ultrasound has a positive effect on mitigating membrane fouling. The membrane filtration resistance caused by blocking cake layers accounted for 86.63% of the total resistance in SMBR-US system, indicating that the blocking cake layer was the main reason for membrane fouling in SMBR-US system. The resistance caused by blocking cake layers and membrane pore blocks were all relatively high in SMBR-Control system, accounting for 59.26 and 38.18% of the total resistance, respectively, suggesting a higher irreversible membrane pollution in SMBR-Control system.

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Fouling characteristics of membrane filtration in membrane bioreactors

Cited by 34 publications

References 13 publications

Treatment of Palm Oil Mill Effluent Using Membrane Bioreactor: Novel Processes and Their Major Drawbacks

Treatment of Palm Oil Mill Effluent Using Membrane Bioreactor: Novel Processes and Their Major Drawbacks

Membrane processing for purification and concentration of β-glycosidases from barley (Hordeum vulgare)

Effect of on-line ultrasound on the properties of activated sludge mixed liquor and the controlling of membrane fouling in SMBR

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