Reproducibility and applicability of the flux step test for a hollow fibre membrane bioreactor

Zsirai, T.; Aerts, P; Judd, Simon

doi:10.1016/j.seppur.2013.01.027

Cited by 6 publications

(3 citation statements)

References 15 publications

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“…As expected intuitively, and also from reported flux step studies (Zsirai et al, 2013, Chu et al, 2014, ΔK/Δt increases with increasing flux or permeability, roughly in accordance with a power law (Fig 7). Previous comparable studies in PW filtration have been limited to flux vs. TMP correlations (Hua et al, 2007;Vatai et al, 2009;Madaeni et al, 2012), which suggest a similar trend but for which data representing fouling rate (i.e.…”

Section: Trialssupporting

confidence: 88%

Ceramic membrane filtration of produced water: Impact of membrane module

Zsirai

Al-Jaml

Qiblawey

et al. 2016

Separation and Purification Technology

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Produced water (PW) generated from oil exploration requires rigorous removal of suspended matter (free oil and particulate solids) as tertiary treatment (downstream of hydrocyclone and gas flotation) if it is to be re-injected into low-permeability reservoirs. The viability of membrane filtration for this duty is largely dependent on sustaining a high membrane flux to minimise the process footprint. A pilot-scale study of PW filtration using crossflow multi-channel ceramic membrane technology has been conducted to identify the appropriate membrane characteristics for sustaining the flux whilst maintaining the required treated water quality. Membranes based on two materials (silicon carbide, SiC, and titanium dioxide, TiO2) and two different pore sizes were challenged with real PW samples taken from oil platforms operating on the Arabian Gulf. The membranes were characterised according to the overall permeability decline rate and the end permeability. Results suggest that SiC membranes outperform TiO2 ones with respect to sustainable permeability under the same operating and maintenance conditions. The SiC microfiltration membrane provided anomalously high permeabilities but also the highest fouling propensity. Results suggest that whilst the high fluxes (1300-1800 L m-2 h-1) are attainable for the technology, this is contingent upon the application of an effective chemical clean.

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Section: Trialssupporting

confidence: 88%

Ceramic membrane filtration of produced water: Impact of membrane module

Zsirai

Al-Jaml

Qiblawey

et al. 2016

Separation and Purification Technology

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“…This change improved filtration as the duration of pressure jump increased from two days to four days and physical cleaning alone was sufficient at the end of four days. Relaxation and/or backwashing are the most commonly used strategies for fouling control in MBRs [28][29][30]. Wu et al [28] compared the various backwash and relaxation strategies on fouling control in a laboratory scale MBR.…”

Section: Membrane Filtration Performancementioning

confidence: 99%

Sulfur-based autotrophic denitrification of drinking water using a membrane bioreactor

Şahinkaya

Yurtsever

Aktaş

et al. 2015

Chemical Engineering Journal

115

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“…The short-term flux-step trial (Table 3) comprised four one-hour flux steps incorporating six backflush steps (Zsirai et al, 2012(Zsirai et al, , 2013 whose values were adjusted according to the sludge concentration. The one-hour flux step tests were followed by four extended (18-hour) overnight flux steps.…”

Section: Flux-step Trialsmentioning

confidence: 99%

Biological treatment and thickening with a hollow fibre membrane bioreactor

et al. 2014

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Aerobic operation of an immersed hollow fibre membrane bioreactor, treating municipal wastewater supplemented with molasses solution, has been studied across mixed liquor suspended solids (MLSS) concentrations between 8 and 32 g L(-1), the higher concentrations being normally associated with thickening operations. Only a marginal loss in membrane permeability was noted between 8 and 18 g L(-1) when operation was conducted without clogging. The sustainable operational flux attainable above 18 g L(-1) was highly dependent upon both the MLSS concentration and the state of the membrane. A temperature-corrected flux of 28 L m(-2) h(-1) (LMH) was sustained for 18 h at an MLSS of 8 g L(-1) using membranes close to initial their virgin-state permeability. This value decreased to around 14 LMH at 20 g L(-1) and 5 LMH at 32 g L(-1) MLSS for an aged membrane whose permeability had been recovered following clogging. Below the threshold flux operation without significant clogging was possible, such that the membrane permeability could be recovered with a chemically enhanced backflush (CEB). Above this flux clogging took place at a rate of around 7-14 g solids per m(2) membrane per m(3) permeate volume passed irrespective of the MLSS concentration. The permeability of the unclogged membrane was depressed and could not be recovered using a standard CEB, indicative of irrecoverable pore clogging. The outcomes corroborated previously reported observations concerning the deleterious long-term impacts of clogging, and confirmed the critical importance of operation at a sustainable flux value.

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Reproducibility and applicability of the flux step test for a hollow fibre membrane bioreactor

Cited by 6 publications

References 15 publications

Ceramic membrane filtration of produced water: Impact of membrane module

Ceramic membrane filtration of produced water: Impact of membrane module

Sulfur-based autotrophic denitrification of drinking water using a membrane bioreactor

Biological treatment and thickening with a hollow fibre membrane bioreactor

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