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Bacterial adhesion inhibition on water treatment membrane by a modified HHC-36 antimicrobial peptide
Abayomi Babatunde Alayande,Euntae Yang,MarMar Aung,In S. Kim 대한환경공학회 2023 Environmental Engineering Research Vol.28 No.3
Antimicrobial peptides (AMPs) are now used instead of conventional antimicrobial substances because they do not induce resistance in microbial cells. The first goal of this study was to investigate how various dissolution solvents, such as dimethyl sulfoxide (DMSO), phosphate buffered saline (PBS) and autoclaved deionized (DI) water, affect the antimicrobial potency of an AMP (HHC-36) modified with L-propargylglycine (PraAMP) against Pseudomonas aeruginosa PAO1, Escherichia coli, and Bacillus sp. The potential application of HHC-36 AMP as a biofouling control agent on water treatment membranes was then investigated using a membrane fouling bacterium as a model. At concentrations greater than 0.5 mg/mL, the AMP demonstrated significant antibacterial efficacy against all the bacteria species. However, the initial dissolution of the HHC-36 AMP in DMSO had a significant impact on its antibacterial effects. DMSO alone (≥ 12.4% vol/vol) exhibited a significant bacterial growth inhibition. This finding is noteworthy because DMSO is commonly used as a solvent for antimicrobial agents that are insoluble in water. Overall, by disrupting bacterial cell membranes, the HHC-36 AMP was able to inactivate bacterial cells on water treatment membrane. This study recapitulates the feasible use of environmentally friendly AMP as antibiofouling agents in water treatment processes.
Asta Blazyte,Abayomi Babatunde Alayande,Thanh-Tin Nguyen,Rusnang Syamsul Adha,장재원,Mar Mar Aung,김인수 한국공업화학회 2021 Journal of Industrial and Engineering Chemistry Vol.94 No.-
In the forward osmosis (FO) process, biofouling is well pronounced on the active side where wastewaterand seawater are used as feed and draw solution, respectively. However, the biofouling tendencies withinthe support layer are not clear. Therefore, the objective of this study was to investigate the effect of TEPpre-conditioning on hydophobicity and initial bacterial attachment of FO membrane support layer. Twostructurally distinct FO membranes from different manufacturers were preconditioned by soaking inartificial sea waterfiltrates containing size fractioned TEP. The conditioning solution pre-treated with a0.4 mm pore sizefilter, contributed to the highest bacterial adhesion rates during bacterial attachmenttesting in both steady state and cross-flow mode in a lab-scale FO system for both membrane types. CTA-ES support exhibited higher numbers of adhered bacteria when compared to PA-TFC support in a steadystate. Conversely, in cross-flow lab-scale testing, a negative impact of fouling on PA-TFC was moreapparent than the CTA-ES membrane. This was attributed to the higher porosity and surface roughness ofthe PA-TFC membrane. Overall, ourfindings reinforce the potential impact of hydrodynamics conditionsand membrane properties on the fouling behavior of FO membrane support layer.
Applications of nisin for biofouling mitigation of reverse osmosis membranes
Jung, Yongmoon,Alayande, Abayomi Babatunde,Chae, Soryong,Kim, In S. Elsevier 2018 Desalination Vol.429 No.-
<P><B>Abstract</B></P> <P>This study addresses the potential of application of nisin, a polycyclic antimicrobial peptide produced by <I>Lactococcus lactis</I>, as a novel biological agent for control/mitigation of biofilms formed by three different microorganisms: (i) <I>Pseudomonas aeruginosa</I> P60, (ii) <I>Bacillus</I> species, and (iii) a mixed culture of the two species. Nisin did not affect the growth rate of either strain, while the viability of <I>Bacillus</I> sp. was decreased, as compared to <I>P. aeruginosa</I> P60. Nisin was particularly effective for the dislodging of bacterial cells and extracellular polymeric substances (EPS) for <I>P. aeruginosa</I> P60. Water permeability of biofouled membranes was recovered by over 92% for all the bacterial strains investigated after nisin cleaning in a dead-end filtration system. Nisin has no detrimental effect on RO membrane and thus, has a potential as a biological agent for the mitigation of membrane biofouling.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Effects of nisin on biofilms were investigated. </LI> <LI> Nisin effectively removes bacteria and EPS from RO membranes. </LI> <LI> Nisin showed high flux recovery in dead-end filtration system. </LI> </UL> </P>
Yang, Euntae,Alayande, Abayomi Babatunde,Kim, Chang-Min,Song, Jun-ho,Kim, In S. Elsevier 2018 Desalination Vol.426 No.-
<P><B>Abstract</B></P> <P>Laminar graphene oxide (GO) membranes with excellent water permeability have demonstrated great potential in the field of membrane-based water purification. However, low ion rejection and controversy over their biofouling propensity are hurdles GO membranes face in realizing commercial applications. This study shows that silver nanoparticle (nAg)@polydopamine (pDA) deposition on chemically reduced GO (rGO) laminates can simultaneously enhance both biofouling resistance and ion rejection. In pressurized filtration tests, the salt rejection of nAg@pDA-rGO membranes outperformed that of GO membranes despite its lowered water permeability. In osmotic filtration tests, nAg@pDA-rGO membranes achieved an increased water flux of 28.9LMH and reduced reverse solute flux of 0.21mol/m<SUP>2</SUP>·h, compared to GO membranes. Moreover, extremely low cell attachment and viability were seen on the nAg@pDA-rGO membrane, confirming the excellent antibiofouling ability of nAg-pDA-rGO membranes.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Fouling resistance and ion selectivity of GO membranes were improved. </LI> <LI> Enhanced ion selectivity by reduction of laminar GO layer. </LI> <LI> Increased fouling resistance by coating silver nanoparticle-polydopamine layer. </LI> <LI> Performance of GO membranes were assessed under hydraulic and osmotic pressure. </LI> <LI> Fouling resistance of GO membranes were evaluated. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>