Live membrane filters with immobilized quorum quenching bacterial strains for anti-biofouling

Shah, Syed Salman Ali; Lee, Kibaek; Park, Hyeona; Choo, Kwang‐Ho

doi:10.1016/j.memsci.2021.119895

Cited by 22 publications

(8 citation statements)

References 42 publications

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“…Lab-scale MBRs were operated and fed with typical synthetic wastewater, as described in a previous study [ 22 ]. The HFM module prepared as described above was installed in the MBRs.…”

Section: Methodsmentioning

confidence: 99%

“…Confocal laser canning microscope (CLSM) and scanning electron microscope (SEM) analyses of layered composite membranes were performed by using CLSM (LSM 700, Carl Zeiss, Jena, Germany) and SEM (SU-8220, Hitachi, Tokyo, Japan), respectively. The membrane specimens for CLSM and SEM analyses were prepared as described in a previous study [ 22 ].…”

Section: Methodsmentioning

confidence: 99%

“…Moreover, bacterial QS signal molecules (e.g., acyl homoserine lactones (AHLs)) remain on the membrane surface during long-term MBR operations despite applying QQ media ( Figure 1 b). Recently, a novel attempt to immobilize QQ bacteria on a polymeric membrane was made by using hydrophilic polymers, which reduced membrane biofouling [ 22 ]. In this study, the attachment of QQ bacteria was made by placing polymeric membranes into a mixture of QQ strains (e.g., BH4) and hydrophilic polymers for a certain period of time (6 h).…”

Section: Introductionmentioning

confidence: 99%

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Layered Antibiofouling Composite Membrane for Quenching Bacterial Signaling

et al. 2022

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Bacterial quorum quenching (QQ) media with various structures (e.g., bead, cylinder, hollow cylinder, and sheet), which impart biofouling mitigation in membrane bioreactors (MBRs), have been reported. However, there has been a continuous demand for membranes with QQ capability. Thus, herein, we report a novel double-layered membrane comprising an outer layer containing a QQ bacterium (BH4 strain) on the polysulfone hollow fiber membrane. The double-layered composite membrane significantly inhibits biofilm formation (i.e., the biofilm density decreases by ~58%), biopolymer accumulation (e.g., polysaccharide), and signal molecule concentration (which decreases by ~38%) on the membrane surface. The transmembrane pressure buildup to 50 kPa of the BH4-embedded membrane (17.8 h ± 1.1) is delayed by more than thrice (p < 0.05) of the control with no BH4 in the membrane’s outer layer (5.5 h ± 0.8). This finding provides new insight into fabricating antibiofouling membranes with a self-regulating property against biofilm growth.

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“…Lab-scale MBRs were operated and fed with typical synthetic wastewater, as described in a previous study [ 22 ]. The HFM module prepared as described above was installed in the MBRs.…”

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Layered Antibiofouling Composite Membrane for Quenching Bacterial Signaling

et al. 2022

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“…The abovementioned indicates the prospects of using Rhodococcus QQ in antimicrobial and antivirulence strategies. Additionally, the use of QQ is promising for the control of biofouling of membrane bioreactors as well as the anode in the microbial fuel cell used in wastewater treatment ( Oh et al, 2013 ; Iqbal et al, 2018 ; Lee et al, 2020 ; Taşkan and Taşkan, 2021 ; Güneş and Taşkan, 2022 ; Shah et al, 2022 ). The reduced ability to form biofilms and produce extracellular biopolymers enables a significantly enhanced wastewater treatment process, including removal of pharmaceuticals.…”

Section: Quorum-quenchingmentioning

confidence: 99%

Rhodococcus strains as a good biotool for neutralizing pharmaceutical pollutants and obtaining therapeutically valuable products: Through the past into the future

2022

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Active pharmaceutical ingredients present a substantial risk when they reach the environment and drinking water sources. As a new type of dangerous pollutants with high chemical resistance and pronounced biological effects, they accumulate everywhere, often in significant concentrations (μg/L) in ecological environments, food chains, organs of farm animals and humans, and cause an intense response from the aquatic and soil microbiota. Rhodococcus spp. (Actinomycetia class), which occupy a dominant position in polluted ecosystems, stand out among other microorganisms with the greatest variety of degradable pollutants and participate in natural attenuation, are considered as active agents with high transforming and degrading impacts on pharmaceutical compounds. Many representatives of rhodococci are promising as unique sources of specific transforming enzymes, quorum quenching tools, natural products and novel antimicrobials, biosurfactants and nanostructures. The review presents the latest knowledge and current trends regarding the use of Rhodococcus spp. in the processes of pharmaceutical pollutants’ biodegradation, as well as in the fields of biocatalysis and biotechnology for the production of targeted pharmaceutical products. The current literature sources presented in the review can be helpful in future research programs aimed at promoting Rhodococcus spp. as potential biodegraders and biotransformers to control pharmaceutical pollution in the environment.

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“…CLSM has been used to visualize the internal structures of membranes 37−39 and membrane fouling. 24,40,41 Using a hydrophilic membrane to separate emulsified oil from water, Lin et al stained both the oil (dodecane) and the fibrous membrane and observed the evolution of fouling by the oil over time through a sequence of 3D images. 40 Bazyar et al stained microorganisms and demonstrated that the LIMs reduced biofouling on the membranes.…”

Section: ■ Introductionmentioning

confidence: 99%

Three-Dimensional Imaging of Emulsion Separation through Liquid-Infused Membranes Using Confocal Laser Scanning Microscopy

Song

2023

Langmuir

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The removal of emulsified oils from water has always been a challenge due to the kinetic stability resulting from the small droplet size and the presence of stabilizing agents. Membrane technology can treat such mixtures, but fouling of the membrane leads to dramatic reductions in the process capacity. Liquid-infused membranes (LIMs) can potentially resolve the issue of fouling. However, their low permeate flux compared with conventional hydrophilic membranes remains a limitation. To gain insight into the mechanism of transport, we use 3D images acquired by confocal laser scanning microscopy (CLSM) to reconstruct the sequence of events occurring during startup and operation of the LIM for removal of dispersed oil from oil-in-water emulsions. We find evidence for coalescence of oil droplets on the surface of and formation of oil channels within the LIM. Using image analysis, we find that the rate at which oil channels are formed within the membrane and the number of channels ultimately govern the permeate flux of oil through the LIMs. Oil concentration in the feed affects the rate of coalescence of oil on the surface of the LIM, which, in turn, affects the channel formation dynamics. The channel formation dynamics also depend on the viscosity of the infused liquid and the operating pressure. A higher affinity to the pore wall for infused liquid than permeating liquid is essential to antifouling behavior. Overall, this work offers insight into the selective permeation of a dispersed liquid phase through a LIM.

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Live membrane filters with immobilized quorum quenching bacterial strains for anti-biofouling

Cited by 22 publications

References 42 publications

Layered Antibiofouling Composite Membrane for Quenching Bacterial Signaling

Layered Antibiofouling Composite Membrane for Quenching Bacterial Signaling

Rhodococcus strains as a good biotool for neutralizing pharmaceutical pollutants and obtaining therapeutically valuable products: Through the past into the future

Three-Dimensional Imaging of Emulsion Separation through Liquid-Infused Membranes Using Confocal Laser Scanning Microscopy

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