Flux-Dependent Fouling Phenomena in Membrane Bioreactors under Different Food to Microorganisms (F/M) Ratios

Wu, Bing; Kitade, Tamotsu; Chong, Tzyy Haur; Lee, Jia Yi; Uemura, T.; Fane, Anthony G.

doi:10.1080/01496395.2012.724501

Cited by 10 publications

(4 citation statements)

References 38 publications

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“…This effect was investigated by Novoa et al (2020), reporting fewer stable aggregates and a broader particle size distribution when higher nutrients were supplied at shorter HRT; the resulting cake layer formed on the membrane surface consisted of heterogeneous particles, and, thus, the void spaces between large particles were filled by the smaller ones, lowering the cake porosity and increasing its resistance to permeation. The results are in agreement with the reported effect of F/M in conventional MBRs (Liao et al, 2002, Wu et al, 2013; for example, higher F/M ratios were reported by Ashadullah et al (2021) and Wu et al (2013) to induce a larger surplus of the substrate that triggered the excretion of EPS, while, on the other hand, low F/M ratios decreased the bacterial growth rates, increasing endogenous metabolism and cell lysis (Metcalf and Eddy, 2003;Fletcher et al, 2011b;.…”

Section: Nutrients Hydraulic Retention Time (Hrt) and Solids Retention Time (Srt)supporting

confidence: 90%

“…As algal fouling develops, the membrane-cell interactions are weakened, and the fouling development is mostly influenced by the cell-cell and cell-AOM interactions in the cake layer (Fletcher et al, 2011b;Wu et al, 2013;Bilad et al, 2014;Kanchanatip et al, 2016;Marbelia et al, 2016;Elcik and Cakmakci, 2017;Ting et al, 2017;Liao et al, 2018;Zhang and Fu, 2018;Zhang M. et al, 2019). In fact, Zhou et al (2020), Novoa et al (2020), and Low et al (2016) report that, in the continuous operation mode, upon the cake layer formation, the XDLVO forces are strongly weakened by convective and hydrodynamic forces.…”

Section: Stages Of Algal Foulingmentioning

confidence: 99%

“…Despite the commonalities reported in the fouling development process of biological sludge and microalgae, the differences in foulants composition and their interactions with the membrane led to different fouling mechanisms (Fletcher et al, 2011b;Wu et al, 2013;Bilad et al, 2014;Kanchanatip et al, 2016;Marbelia et al, 2016;Elcik and Cakmakci, 2017;Ting et al, 2017;Liao et al, 2018;Zhang and Fu, 2018;Zhang M. et al, 2019). In algal processes, the cells present large sizes and are completely retained by UF and MF membranes, and, thus, the cake layer constitutes a significantly larger fraction of total fouling when compared with other processes, such as MBRs.…”

Section: Stages Of Algal Foulingmentioning

confidence: 99%

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Membrane Fouling in Algal Separation Processes: A Review of Influencing Factors and Mechanisms

2021

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The use of algal biotechnologies in the production of biofuels, food, and valuable products has gained momentum in recent years, owing to its distinctive rapid growth and compatibility to be coupled to wastewater treatment in membrane photobioreactors. However, membrane fouling is considered a main drawback that offsets the benefits of algal applications by heavily impacting the operation cost. Several fouling control strategies have been proposed, addressing aspects related to characteristics in the feed water and membranes, operational conditions, and biomass properties. However, the lack of understanding of the mechanisms behind algal biofouling and control challenges the development of cost-effective strategies needed for the long-term operation of membrane photobioreactors. This paper reviews the progress on algal membrane fouling and control strategies. Herein, we summarize information in the composition and characteristics of algal foulants, namely algal organic matter, cells, and transparent exopolymer particles; and review their dynamic responses to modifications in the feedwater, membrane surface, hydrodynamics, and cleaning methods. This review comparatively analyzes (i) efficiency in fouling control or mitigation, (ii) advantages and drawbacks, (iii) technological performance, and (iv) challenges and knowledge gaps. Ultimately, the article provides a primary reference of algal biofouling in membrane-based applications.

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Section: Nutrients Hydraulic Retention Time (Hrt) and Solids Retention Time (Srt)supporting

confidence: 90%

Section: Stages Of Algal Foulingmentioning

confidence: 99%

Section: Stages Of Algal Foulingmentioning

confidence: 99%

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Membrane Fouling in Algal Separation Processes: A Review of Influencing Factors and Mechanisms

2021

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“…The higher loadings associated with the industrial effluents do not appear to correlate with a higher MLSS levels: the average levels are actually lower. This implies a higher F:M ratio for industrial effluents, which may then be associated with increased fouling [34].…”

Section: Biotreatmentmentioning

confidence: 99%

The status of industrial and municipal effluent treatment with membrane bioreactor technology

Judd

2016

Chemical Engineering Journal

238

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The status of MBR technology has been scrutinised with reference to (a) available commercial technologies and their characteristics, (b) key design and performance parameters of existing full-scale installations, and (c) practitioner perception. The key design and operating parameters of flux and COD removal were considered with reference to 100 installations, 40 based on municipal and 60 on industrial wastewater treatment. The perception of practitioners was appraised through a conventional survey, with 186 respondents. A review of the commercial products revealed polyvinylidene difluoride (PVDF) to be the most prevalent membrane material, accounting for almost half of all products, and provided both in flat sheet (FS) and hollow fibre (HF) configurations. Polyethylsulphone (PES) and polyolefinic membranes (polyethylene, PE and polypropylene, PP) were also found to be available in FS and HF configurations respectively. Almost all products had a nominal membrane pore size between 0.03 and 0.4 µm. Design fluxes in L m-2 h-1 (LMH) for municipal wastewater treatment were predominantly in the 15-25 LMH range, 18.5±4.8 LMH on average, for the average daily flow (ADF), and in the 20-30 LMH range, 26.0±6.6 LMH on average, for peak daily flow (PDF). Fluxes were lower, and dependent on both process configuration and effluent quality, for industrial effluents; the most challenging effluents (landfill leachate) were associated with the lowest fluxes. As expected, treatment capability related roughly to the feedwater BOD/COD ratio, with more than 90% COD removal achieved for food and beverage effluents (for which BOD/COD ratios were largely above 0.5)-comparable with municipal wastewater treatment. Respondents to the survey, around 85% of whom were practitioners, identified pre-treatment (screening) as presenting the greatest technical challenge to MBR operation.

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Evaluating the effect of hydraulic retention time on fouling development and biomass characteristics in an algal membrane photobioreactor treating a secondary wastewater effluent

Novoa

Fortunato

Rehman

et al. 2020

Bioresource Technology

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Flux-Dependent Fouling Phenomena in Membrane Bioreactors under Different Food to Microorganisms (F/M) Ratios

Cited by 10 publications

References 38 publications

Membrane Fouling in Algal Separation Processes: A Review of Influencing Factors and Mechanisms

Membrane Fouling in Algal Separation Processes: A Review of Influencing Factors and Mechanisms

The status of industrial and municipal effluent treatment with membrane bioreactor technology

Evaluating the effect of hydraulic retention time on fouling development and biomass characteristics in an algal membrane photobioreactor treating a secondary wastewater effluent

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