Fate, behaviour, and implications of ZnO nanoparticles in a simulated wastewater treatment plant
| Autor: | Ndeke Musee, J. N. Zvimba, Jane Catherine Ngila, Eutilério F.C. Chaúque |
|---|---|
| Jazyk: | angličtina |
| Rok vydání: | 2016 |
| Předmět: |
OECD 303A
chemistry.chemical_element 02 engineering and technology Zinc 010501 environmental sciences Management Monitoring Policy and Law 01 natural sciences Applied Microbiology and Biotechnology activated sludge wastewater Waste Management and Disposal Effluent wastewater activated sludge nanoparticles zinc oxide OECD 303A 0105 earth and related environmental sciences Water Science and Technology Chemistry Chemical oxygen demand Environmental engineering zinc oxide 021001 nanoscience & nanotechnology Activated sludge Zno nanoparticles Wastewater Environmental chemistry nanoparticles Sewage treatment Inductively coupled plasma 0210 nano-technology |
| Zdroj: | Water SA; Vol 42, No 1 (2016); 72-81 Water SA, Volume: 42, Issue: 1, Pages: 72-81, Published: JAN 2016 |
| ISSN: | 0378-4738 |
| Popis: | 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 processKeywords: wastewater, activated sludge, nanoparticles, zinc oxide, OECD 303A |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|