Inhibition of total oxygen uptake by silica nanoparticles in activated sludge

Sibag, Mark; Choi, Byeong Gyu; Suh, Changwon; Lee, Kwan Hyung; Lee, Jae Woo; Maeng, Sung Kyu; Cho, Jinwoo

doi:10.1016/j.jhazmat.2014.10.032

Cited by 26 publications

(12 citation statements)

References 34 publications

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“…Similar to that observed in a CAS for yet unclear reasons, activated sludge exposure to SiO 2 NPs [8] and their inhibitory effect on total respiration [24] were also not associated with low oxidation of COD and NH 3 . Over a period of 20 days after the exposure of activated MBR to SiO 2 NPs, I T in the presence of 144 nm SiO 2 NPs (M = 37, SD = 7) was higher than with 28 nm SiO 2 NPs (M = 8, SD = 9), t(10) =´6, p < 0.05.…”

Section: Potential Biological Effect Of Sio 2 Nps On Activated Sludgesupporting

confidence: 74%

“…The size-dependent toxicity of nanoparticles has been widely reported in literature, particularly in studies of nanoparticle toxicity in pure culture bacteria [22,23]. Previously, we have shown in batch experiments that smaller SiO 2 NPs (~12 nm and~151 nm) were more inhibitory than the larger SiO 2 NPs (442 nm and 683 nm) given that the concentration or dose did not change throughout the period of study [24]. The size-dependent toxicity of nanoparticles observed from these studies is most likely due to their greater surface area [25].…”

Section: Potential Biological Effect Of Sio 2 Nps On Activated Sludgementioning

confidence: 75%

“…However, there is no conclusive evidence for the mechanism of SiO 2 NPs inhibition of activated sludge total respiration although indirect evidence from fatty acid methyl ester (FAME) analysis of activated sludge suggests that SiO 2 NPs altered the composition of the microbial membrane lipids [24]. The potential biological effects of SiO 2 NPs on activated sludge warrants further investigations, especially because in nanotoxicity the key role of the interaction of nanoparticles (including SiO 2 NPs) with proteins, which are also a component of activated sludge extracellular polymeric substances (EPS), has been recognized recently [28][29][30].…”

Section: Potential Biological Effect Of Sio 2 Nps On Activated Sludgementioning

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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Section: Potential Biological Effect Of Sio 2 Nps On Activated Sludgesupporting

confidence: 74%

Section: Potential Biological Effect Of Sio 2 Nps On Activated Sludgementioning

confidence: 75%

Section: Potential Biological Effect Of Sio 2 Nps On Activated Sludgementioning

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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“…For verification and comparison purpose, three other methods including atomic force microscopy (AFM), respiration inhibition, and potassium ion leakage were also employed for evaluation of the membrane damage effects of the phenolic compounds [12,26]. The results of this study indicated that the ferricyanide-mediated electrochemical method has significant potential as a membrane damage assay tool for phenolic EO compounds.…”

Section: Introductionmentioning

confidence: 99%

Mediated electrochemical method for the analysis of membrane damage effects of phenolic compounds to Staphylococcus aureus

Wang

et al. 2015

Journal of Electroanalytical Chemistry

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“…103 Transmission Electron Microscopy (TEM) image analysis suggests some of the SiO 2 NPs are adsorbed on and/or apparently embedded in the microbial cell membrane.…”

mentioning

confidence: 99%

Fate and transformation of nanoparticles (NPs) in municipal wastewater treatment systems and effects of NPs on the biological treatment of wastewater: a review

et al. 2017

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Many types of nanoparticles (NPs) have been reported to be toxic to organisms. Wastewater treatment plants are among the important pathways for the migration and transformation of NPs in the environment. Based on a summary of the toxicity of NPs to microorganisms, this review discusses the advances in the fate and transformation of NPs in wastewater treatment plants (WWTPs) and the impacts of NPs on the biological treatment of wastewater. These NPs primarily include Ag NPs, Cu NPs, CuO NPs, ZnO NPs, TiO 2 NPs, Al 2 O 3 NPs, SiO 2 NPs, carbon nanotubes (CNTs) and magnetic NPs. This review observes that the different properties of these NPs result in significant differences in the fate, transformation, antimicrobial activities and effects on biological wastewater treatment. Although many studies have been undertaken in this field, more studies are needed to address the adverse effects of NPs on organic and nutrient removal, as well as their toxic mechanisms.

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Inhibition of total oxygen uptake by silica nanoparticles in activated sludge

Cited by 26 publications

References 34 publications

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

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

Mediated electrochemical method for the analysis of membrane damage effects of phenolic compounds to Staphylococcus aureus

Fate and transformation of nanoparticles (NPs) in municipal wastewater treatment systems and effects of NPs on the biological treatment of wastewater: a review

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