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Dive into the research topics where N Musee is active.

Publication


Featured researches published by N Musee.


Journal of Environmental Science and Health Part A-toxic\/hazardous Substances & Environmental Engineering | 2014

Fate and behavior of ZnO- and Ag-engineered nanoparticles and a bacterial viability assessment in a simulated wastewater treatment plant.

N Musee; John N. Zvimba; Lisa M. Schaefer; Nomakhwezi Nota; Lucky Sikhwivhilu; Melusi Thwala

The fate and behaviour assessment of ZnO- and Ag-engineered nanoparticles (ENPs) and bacterial viability in a simulated wastewater treatment plant (WWTP) fed with municipal wastewater was investigated through determination of ENPs stability at varying pH and continuous exposure of ENPs to wastewater, respectively. The ENPs were introduced to a 3-L bioreactor (simulated WWTP) with a hydraulic residence time (HRT) of 6 h at a dose rate of 0.83 mg/min for 240 h. The stability of the ENPs was found to be dependent on their dissolution and aggregation at different pH, where ZnO ENPs exhibited the highest dissolution at low pH compared to Ag ENPs. The results also showed that both ENPs had high affinity for the sewage sludge as they undergo aggregation under typical wastewater conditions. Results of effluent monitored daily showed mean COD removal efficiencies of 71 ± 7% and 74 ± 8% for ZnO and Ag ENPs in test units, respectively. The treated effluent had low mean concentrations of Zn (1.39 ± 0.54 mg/L) and Ag (0.12 ± 0.06 mg/L); however, elevated mean concentrations of Zn (54 ± 39 mg/g dry sludge) and Ag (57 ± 42 mg/g dry sludge) were found in the sludge – suggesting removal of the ENPs from the wastewater by biosorption and biosolid settling mechanisms. Using X-ray diffraction (XRD) and transmission electron microscopy (TEM), the mineral identities of ZnO and Ag ENPs in the sludge from the test units were found comparable to those of commercial ENPs, but larger due to agglomeration. The bacterial viability assessment after exposure to ENPs using the Live/Dead BacLight kit, although not quantitatively assessed, suggested high resilience of the bacteria useful for biodegradation of organic material in the simulated wastewater treatment system.


Environmental Science: Processes & Impacts | 2013

The oxidative toxicity of Ag and ZnO nanoparticles towards the aquatic plant Spirodela punctuta and the role of testing media parameters.

Melusi Thwala; N Musee; Lucky Sikhwivhilu; Victor Wepener


Archive | 2014

Monitoring fate and behaviour of Nanoceria under relevant environmental conditions

Y Tancu; Melusi Thwala; Nicholas M Musyoka; N Musee


Archive | 2014

An analysis of engineered nanomaterial characteristics reported in aquatic nanotoxicity studies: 2004-2013

Melusi Thwala; N Mahaye; Lisa M. Schaefer; N Musee


Archive | 2014

Exposure assessment of metal-based nanoparticles in aquatic environments: interactive influence of water chemistry and nanopaticle characteristics

Melusi Thwala; N Radebe; Y Tancu; N Musee


Archive | 2014

Stability of silver nanoparticles (nAg) in aqueous solution: the role of particle size and water ionic strength

N Radebe; Lm Cele; Lucky Sikhwivhilu; P Shumbula; N Musee; Melusi Thwala


Archive | 2013

The oxidative toxicity of Ag and ZnO nanoparticles towards the aquatic plant Spirodela punctuta and the role of testing media parameters: Conference paper

Melusi Thwala; N Musee; Lucky Sikhwivhilu; Wepener


Archive | 2013

How water chemistry determines the risk of metallic engineered nanoparticles in aquatic ecosystems: nAg and nZnO case study

Melusi Thwala; N Musee; Lucky Sikhwivhilu; Wepener


Archive | 2013

The stability of Ag and ZnO engineered nanoparticles in Hoagland's nutrient water: the role of particle size and morphology

N Radebe; Melusi Thwala; Lm Cele; Lucky Sikhwivhilu; N Musee; P Shumbula


Archive | 2012

Zinc oxide and silver nanoparticles influence the antioxidative status in a higher aquatic plant, Spirodela punctata

Melusi Thwala; N Musee; Wepener

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Lisa M. Schaefer

Council of Scientific and Industrial Research

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Melusi Thwala

Council for Scientific and Industrial Research

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Y Tancu

Council for Scientific and Industrial Research

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Melusi Thwala

Council for Scientific and Industrial Research

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John N. Zvimba

Council of Scientific and Industrial Research

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Melusi Thwala

Council for Scientific and Industrial Research

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Nomakhwezi Nota

Council of Scientific and Industrial Research

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N Mahaye

Council for Scientific and Industrial Research

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