Removal characteristics of engineered nanoparticles by activated sludge

Park, Heejin; Kim, Hee Yeon; Cha, Seoeun; Ahn, Chang Hoon; Roh, Jinkyu; Park, Sumin; Kim, Sujin; Choi, Kyunghee; Yi, Jongheop; Kim, Younghun; Yoon, Jeyong

doi:10.1016/j.chemosphere.2013.03.020

Cited by 93 publications

(42 citation statements)

References 22 publications

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“…The difference in the inhibitory activity may also be explained by several factors, including efficacy in antimicrobial activity, biosorption-dependent manner, physical properties, such as the size of the nanoparticle, penetration abilities, and other chemical properties effecting the affinity between the materials and the biofilms [40]. The results suggest that CuNPs were better antibiofilm agents against the Gram-negative and Gram-positive bacteria than ZnONPs.…”

Section: Antibiofilm Assaymentioning

confidence: 63%

Antibiofilm activity of biogenic copper and zinc oxide nanoparticles-antimicrobials collegiate against multiple drug resistant bacteria: a nanoscale approach

et al. 2016

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The synthesis of biogenic nanoparticles from non-chemical resources has increased the drive toward understanding infection biology. Accordingly, we aimed to address the symbiotic antibiofilm effect of biogenic copper and zinc oxide nanoparticles with antimicrobials against multidrug resistant (MDR) pathogens. The minimum inhibitory concentration (MIC) of copper nanoparticles (CuNPs) and zinc oxide nanoparticles (ZnONPs) at the range from 2 to 128 lg/ml was calculated against Grampositive and Gram-negative pathogenic bacteria using a broth dilution method. Both nanoparticles have prime antibacterial activity compared with standard antibiotics (excluding against P.aeruginosa MTCC 741). A qualitative assessment of biofilm formation and collegial effect was performed using a modified test tube and the microtiter plate-based method by measuring the optical density and time kill of nanoparticles. The results demonstrated efficient antibiofilm activity of CuNPs in its lowest concentration than ZnONPs and antibiotics itself. In addition, significant enhancing antibiofilm effect was also shown by CuNPs in the presence of third generation antibiotics against Gram-negative and Gram-positive bacteria. A scanning electron microscopy (SEM) analysis was used to investigate the effect of the nanoparticles on morphological changes of Staphylococcus aureus. Current data highlights, biogenic CuNPs and ZnONPs could be used as an adjuvant for antibiotics in the treatment of bacterial infections.

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Section: Antibiofilm Assaymentioning

confidence: 63%

Antibiofilm activity of biogenic copper and zinc oxide nanoparticles-antimicrobials collegiate against multiple drug resistant bacteria: a nanoscale approach

et al. 2016

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“…From the above data, it was seen that the AfAg-NPs were better antibiofilm agents against the gram-negative bacteria than the EnAg-NPs. This difference in the inhibitory activity of both Ag-NPs can also be explained by several factors, including efficacy in antimicrobial activity, physical properties like size of nanoparticles, which affect the limited penetration and other chemical properties like affinity between the materials and the biofilms (Park et al 2013). Park et al (2013) also proposed that the biosorption might be responsible for the biofilm inactivation in P. aeruginosa, and AgNPs inactivated P. aeruginosa biofilm cells in a biosorption-dependent manner.…”

Section: Antibiofilm Potential Of Ag-npsmentioning

confidence: 99%

Synergistic antibacterial and antibiofilm activity of silver nanoparticles biosynthesized by lignin-degrading fungus

Barapatre

Aadil

Jha

2016

Bioresour. Bioprocess.

138

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Background:The fabrication of silver nanoparticles (Ag-NPs) through green chemistry is an emerging area in the field of medical nanotechnology. Ag-NPs were fabricated by enzymatic reduction of AgNO 3 using two lignin-degrading fungus Aspergillus flavus (AfAg-NPs) and Emericella nidulans (EnAg-NPs). The prepared Ag-NPs were characterized by different spectroscopic techniques. Antibacterial activity of prepared Ag-NPs was demonstrated against selected Gram negative (Escherichia coli and Pseudomonas aeruginosa) and Gram positive (Staphylococcus aureus) bacteria in the term of minimum bactericidal concentration (MBC) and susceptibility constant (Z). The synergistic antibacterial activity of Ag-NPs with four conventional antibiotics was also determined by the fractional inhibitory concentration index (FICI) using the checkerboard microdilution method. The antibiofilm potential of Ag-NPs was also tested. Results:The plasmon surface resonance of biosynthesized Ag-NPs shows its characteristic peaks at UV and visible region (~450 and 280 nm). Fourier transform infrared spectrometer (FTIR) analysis confirms the nature of the capping agents as protein (enzyme) and indicates the role of protein (enzyme) in reduction of silver ions. The average particle size and charge of synthesized Ag-NPs was ~100 nm and ~−20 mV, respectively. X-ray diffraction (XRD) and TEM analysis confirmed the purity, shape, and size (quasi-spherical, hexagonal, and triangular) of Ag-NPs. Energy-dispersive X-ray spectroscopy (EDX) data validate the biological synthesis of Ag-NPs. Low MBC and high susceptibility constant indicate the high antimicrobial strength of biosynthesized Ag-NPs. The antibacterial analysis demonstrates the synergistic antimicrobial activity of Ag-NPs with antibiotics. This study also shows that biosynthesized Ag-NPs have ability to inhibit the biofilm formation by 80-90 %. Conclusion:The Aspergillus flavus and Emericella nidulans-mediated biosynthesized Ag-NPs have significant antimicrobial activity and demonstrate synergistic effect in combination with antibiotics. It suggests that nanoparticles can be effectively used in combination with antibiotics to improve the efficacy of antibiotics against pathogenic microbes. The substantial antibiofilm efficiency of biosynthesized Ag-NPs would also be helpful against sensitive and multidrug-resistant strains.

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“…The influent was a synthetic wastewater [15], whose composition includes 300 mg/L glucose (C 6 Figure 1) were set up, each having an effective reactor volume (V) of 6 L. One MBR setup served as the control setup, i.e., SiO 2 NPs were not added to the influent. The two other MBR setups served as the experimental setups, i.e., SiO 2 NPs were added to the influent.…”

Section: Methodsmentioning

confidence: 99%

“…Although the presence of SiO 2 NPs in wastewater recently has been considered in operational strategies [5][6][7] and performance evaluation [8] for biological wastewater treatment systems, many of the studies have focused on CAS systems. In a CAS, the presence of SiO 2 NPs has no detrimental effect on the aerobic removal of COD [2] and NH 3 -N [8].…”

Section: Introductionmentioning

confidence: 99%

“…Thus, one may expect that the biological response to SiO 2 in an MBR is similar to that observed in a CAS considering that the biological processes occurring in both systems are governed by activated sludge process. To demonstrate this, we performed continuous lab-scale MBR experiments under a constant flux and evaluated the response of activated sludge to SiO 2 NPs based on the activated sludge respiration inhibition test and measurement of the removal efficiency of COD and NH 3 -N. As the particle size may influence SiO 2 NPs' colloidal stability in wastewater [1][2][3][4][5][6][7][8][9][10] and thus their retention in a MBR, we considered two types of SiO 2 NPs based on size range, assessed their retention by comparison of activated sludge biomass between a control and an experimental group and confirmed their retention in a series of batch filtration tests.…”

Section: Introductionmentioning

confidence: 99%

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Retention of Silica Nanoparticles in a Lab-Scale Membrane Bioreactor: Implications for Process Performance and Membrane Fouling

Sibag

Lee

Kim³

et al. 2016

Water

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Abstract:In conventional activated sludge (CAS) involving aerobic biological processes, the retention of silica nanoparticles (SiO 2 NPs) has no detrimental effect on chemical oxygen demand (COD) and ammonia nitrogen (NH 3 -N) removal. However, for the membrane bioreactor (MBR) system, which is also based on the activated sludge process in addition to the membrane separation process, it has implications not only on the process performance but also on membrane fouling. To investigate these two implications in lab-scale experiments, we continuously operated a control MBR and two experimental MBRs, in which the 28 nm SiO 2 NPs and 144 nm SiO 2 NPs were added separately to the influent at a final concentration of 100 mg/L. Although the retention of SiO 2 NPs in the MBR, as confirmed by dynamic light scattering (DLS) analysis, did not compromise the COD and NH 3 -N removal, it resulted in substantial increases in the transmembrane pressure (TMP) suggesting the onset of membrane fouling. Analyses by batch-dead end filtration revealed the same fouling trend as observed during the continuous MBR experiments; membrane fouling is aggravated in the presence of SiO 2 NPs. This was evident from permeate flux decline of between 30% and 74% at very low TMP (5 kPa) and the further increases in the total resistance.

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Removal characteristics of engineered nanoparticles by activated sludge

Cited by 93 publications

References 22 publications

Antibiofilm activity of biogenic copper and zinc oxide nanoparticles-antimicrobials collegiate against multiple drug resistant bacteria: a nanoscale approach

Antibiofilm activity of biogenic copper and zinc oxide nanoparticles-antimicrobials collegiate against multiple drug resistant bacteria: a nanoscale approach

Synergistic antibacterial and antibiofilm activity of silver nanoparticles biosynthesized by lignin-degrading fungus

Retention of Silica Nanoparticles in a Lab-Scale Membrane Bioreactor: Implications for Process Performance and Membrane Fouling

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