Evaluation of membrane fouling mitigation strategies in an algal membrane photobioreactor (AMPBR) treating secondary wastewater effluent

Fortunato, Luca; Lamprea, Andrés Felipe; Leiknes, TorOve

doi:10.1016/j.scitotenv.2019.134548

Cited by 47 publications

(22 citation statements)

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“…The cake layer is a complex matrix composed of foulants like cells, debris, inorganic colloidal particles, and AOM, which provides additional hydraulic resistance to the filtration and reduces the water permeability (Liao et al, 2018;Zhang and Fu, 2018;Zhang M. et al, 2019). The cake layer is often reversible, depending on its adhesive properties (Bin et al, 2017;Fortunato et al, 2020;Zhou et al, 2020). In fact, Bin et al (2017) described higher reversible cake layer resistance when algal cells or debris is accumulated on the vicinity of the membrane surface, in divergence with cell debris and IOM that showed a greater tendency to irreversible fouling.…”

Section: (Table 1)mentioning

confidence: 99%

“…A broad number of studies have highlighted the influence of several factors affecting algal biofouling and separation performance (Le-Clech et al, 2005;Fletcher et al, 2011b;Krzeminski et al, 2017;Luo et al, 2017;Bagheri and Mirbagheri, 2018;Fortunato et al, 2020;Jiang et al, 2020;Zhou et al, 2020;Sun et al, 2021). These aspects include membrane characteristics, such as pore size and membrane materials; characteristics, such as algal species and cell size (Kanchanatip et al, 2016;Elcik and Cakmakci, 2017;Keyvan Hosseini et al, 2020); metabolic products, including fractions of proteins and carbohydrates (Kanchanatip et al, 2016;Shekhar et al, 2017;Wu et al, 2018;Luo et al, 2019;Zhang Z. et al, 2020;Zhou et al, 2020); and operating conditions, such as the hydraulic retention time (HRT) and solids retention time (SRT) (Low et al, 2016;Novoa et al, 2020).…”

Section: Introductionmentioning

confidence: 99%

“…Considering the high fouling propensity in algal membrane separation processes, fouling control strategies are crucial to ensure their long-term operation (Eliseus et al, 2017;Zhang and Fu, 2018;Fortunato et al, 2020;Hua et al, 2020). Different strategies, including physical and chemical membrane cleaning, have been employed to increase the membrane life span and reduce the impact of fouling on the process (Zhao et al, 2021a).…”

Section: Introductionmentioning

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: (Table 1)mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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

2021

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“…Le microalghe investigate appartengono alla specie "Chlorella Vulgaris" e, tramite illuminazione del bioreattore, esse svolgono processi foto-reattivi e forniscono ossigeno ai batteri aerobi eterotrofi per mineralizzare gli inquinanti organici, come nitriti, nitrati e fosfati 13,14 . C'è la possibilità che possa crescere uno stato di fouling dovuto alle alghe soprattutto perché esse generano TEP 15 , ma comunque facilmente removibile tramite contro-lavaggio con acqua/gas e rilassamento, 16 .…”

Section: Biotecnologie Avanzate Applicate Ai Bioreattori a Membranaunclassified

Biotecnologie avanzate per il trattamento sostenibile delle acque reflue

Ronca¹

2021

Preprint

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Il trattamento delle acque reflue risulta prioritario nell’ottica di uno sviluppo sostenibile, in quanto l’utilizzo delle moderne biotecnologie può produrre effluenti di elevata qualità, pronti allo sversamento e/o al riutilizzo. In quest’ottica, i bioreattori a membrana (MBR) risultano una tecnologia promettente. Il riscontro maggiormente osservato dalla comunità scientifica riguarda la qualità dell’effluente dopo il trattamento con MBR: esso risulta di qualità elevata e sostanzialmente disinfettato. D’altro canto, la problematica del fouling va a ridurre il loro utilizzo a scala reale. Recenti studi hanno fatto luce su vari scenari volti al miglioramento degli MBR per mitigare il fenomeno del fouling e per migliorare le performance depurative. Le tecnologie che si analizzano in questo articolo sono le membrane dinamiche autoformanti (SFDM), l’applicazione di processi elettrochimici al trattamento delle acque reflue (eMBR) e l’inoculazione di microalghe con fanghi attivi nel bioreattore (AS-MBR).

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“…OCT analysis. In-situ non-invasive biomass analysis was accomplished by using OCT on the membrane biofilm portions collected after the experiments to assess the efficiency of fouling mitigation strategy (32). Figure 3 shows an upper view of the 3D cross-sections of the different treatments employed in this study.…”

Section: Isolated Bacteriophages and Their Ability To Infect Membranementioning

confidence: 99%

UV and bacteriophages as a chemical-free approach for cleaning membranes from anaerobic bioreactors

Scarascia

Fortunato

Myshkevych

et al. 2020

Preprint

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Anaerobic membrane bioreactor (AnMBR) for wastewater treatment has attracted much interest due to its efficacy in providing high quality effluent with minimal energy costs. However, membrane biofouling represents the main bottleneck for AnMBR because it diminishes flux and necessitates frequent replacement of membranes. In this study, we assessed the feasibility of combining bacteriophages and UV-C irradiation to provide a chemical-free approach to remove biofoulants on the membrane. The combination of bacteriophage and UV-C resulted in better log cells removal and twice higher extracellular polymeric substance (EPS) concentration reduction in mature biofoulants compared to UV-C. A reduction in the relative abundance of Acinetobacter spp. and selected gram-positive bacteria associated with the membrane biofilm was also achieved by the new cleaning approach. Microscopic analysis further revealed the formation of cavities in the biofilm due to bacteriophages and UV-C irradiation, which would be beneficial to maintain water flux through the membrane. When the combined treatment was further compared with the common chemical cleaning procedure, a similar reduction on the cell numbers was observed (1.4 log). However, combined treatment was less effective in removing EPS compared with chemical cleaning. These results suggest that the combination of UV-C and bacteriophage have an additive effect in biofouling reduction, representing a potential chemical-free method to remove reversible biofoulants on membrane fitted in an anaerobic membrane bioreactor.

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Evaluation of membrane fouling mitigation strategies in an algal membrane photobioreactor (AMPBR) treating secondary wastewater effluent

Cited by 47 publications

References 49 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

Biotecnologie avanzate per il trattamento sostenibile delle acque reflue

UV and bacteriophages as a chemical-free approach for cleaning membranes from anaerobic bioreactors

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