Stability studies of commercial ZnO engineered nanoparticles in domestic wastewater

Chaúque, Eutilério F.C.; Zvimba, John Ngoni; Ngila, Jane Catherine; Musee, N

doi:10.1016/j.pce.2013.09.011

Cited by 36 publications

(15 citation statements)

References 21 publications

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“…High levels of ENP removal from the wastewater could not be wholly linked to the influence of pH and ionic strength, although earlier findings have indicated that ZnO ENP stability is dependent on pH and ionic strength of wastewater (Chaúque et al, 2014). Additional influencing factors on ENP stability in aqueous media include natural organic matter (NOM).…”

Section: Effect Of Concentration On Zno Enp Removalmentioning

confidence: 99%

Fate, behaviour, and implications of ZnO nanoparticles in a simulated wastewater treatment plant

Chaúque¹,

Zvimba²,

Ngila³

et al. 2016

WSA

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Increased use of engineered nanoparticles (ENPs) has resulted in their entry into municipal wastewater treatment plants (WWTPs) as their final sinks. However, the adverse impact of ENPs on the bacterial activity in the activated sludge WWTPs is not yet well understood, despite their increased release into such systems. In this study, the impacts on WWTPS associated with the disposal of zinc oxide (ZnO) ENPs was investigated using a simulated WWTP developed as per the prescribed Organization for Economic Co-operation and Development (OECD 303A) specifications. Analyses were done to determine zinc concentrations at various stages of the setup, mainly in the raw wastewater and treated effluent, using inductively coupled plasma optical emission spectrometry (ICP-OES). The results obtained indicated low levels of zinc residue (about 50-200 µg/L) in the treated effluent compared to relatively high concentrations of Zn in the sludge (about 3 000 mg/kg). Results reported herein imply precipitation of ZnO ENPs during wastewater treatment processes and hence its high levels in the sludge. The presence of solid Zn in the sludge was determined using X-ray diffraction spectroscopy (XRD). Overall, no significant impact of ZnO ENPs on the performance of the simulated WWTP was observed, in terms of the removal levels of chemical oxygen demand (COD) during the treatment process

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Section: Effect Of Concentration On Zno Enp Removalmentioning

confidence: 99%

Fate, behaviour, and implications of ZnO nanoparticles in a simulated wastewater treatment plant

Chaúque¹,

Zvimba²,

Ngila³

et al. 2016

WSA

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“…After, the replacement of OH – by PO 4 ‐P, and finally the crystallization of amorphous zinc phosphate. It is important consider that the amount of Zn +2 released from ZnO NPs in wastewater is around 10%, which may vary according to the physicochemical composition of aqueous media (Chaúque, Zvimba, Ngila, & Musee, ). Conversely, the effects associated to TiO 2 NPs such as, damage to microorganisms and PO 4 ‐P removal, may be related to the adsorption process performed on the surface of this NPs.…”

Section: Resultsmentioning

confidence: 99%

Interactions and effects of metal oxide nanoparticles on microorganisms involved in biological wastewater treatment

Cervantes-Avilés

Barriga-Castro²,

Palma-Tirado

et al. 2017

Microscopy Res & Technique

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To clarify the toxicological effects of metal oxide nanoparticles (NPs) on microorganisms with environmental relevance, it is necessary to understand their interactions. In this work, they were studied the effects and the morphological interactions of two metal oxide NPs (ZnO and TiO ) with microorganisms, during aerobic treatment of wastewater. The effects were evaluated according to nutrient removal from wastewater, while morphological interactions were determined by three different techniques such as TEM, HAADF-STEM, as well as an elemental mapping. According to results about effects of both NPs, they inhibited the removal of organic matter and ammonia nitrogen, and enhanced the orthophosphate removal. Related to morphological interactions, the electron-dense material of both NPs was mainly observed bounded to cell membrane. In tests with ZnO NPs, it was also observed electron-dense material internalized in microorganisms without physical damage in cell membrane. The elemental mapping was useful to determine that the electron-dense material corresponded to Zn and Ti. Both interactions, internalization and attachment of NPs on cell membrane of microorganisms may trigger the negative effect in the removal of organic matter and nitrogen.

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“…In another study Ti concentra- 33 tion in the waste water treatment plant was found to be in a range 34 of 181-1233 mg/L [5]. The effluents released from waste water 35 treatment plants and waste incineration of products was observed 36 to be the primary entry points of TiO 2 NPs to the aquatic 37 environment.…”

Section: Introductionmentioning

confidence: 93%

“…1). The increase in the size of the nanoparticles occurs due to 337 the presence of natural organic matter such as humic acid in the 338 freshwater matrix [35]. The photocatalysis also occurs under visible light condition, but 489 the extent to which it happens is less when compared to UV as the 490 process depends upon the energy of incident photons [39].…”

Section: Introductionmentioning

confidence: 99%

Cytotoxicity of titania nanoparticles towards waste water isolate Exiguobacterium acetylicum under UVA, visible light and dark conditions

Mathur

Raghavan

Chaudhury

et al. 2015

Journal of Environmental Chemical Engineering

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Stability studies of commercial ZnO engineered nanoparticles in domestic wastewater

Cited by 36 publications

References 21 publications

Fate, behaviour, and implications of ZnO nanoparticles in a simulated wastewater treatment plant

Fate, behaviour, and implications of ZnO nanoparticles in a simulated wastewater treatment plant

Interactions and effects of metal oxide nanoparticles on microorganisms involved in biological wastewater treatment

Cytotoxicity of titania nanoparticles towards waste water isolate Exiguobacterium acetylicum under UVA, visible light and dark conditions

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