| Field |
Field Value |
| Title |
Removal of Oxide Nanoparticles in a Model Wastewater Treatment Plant: Influence of Agglomeration and Surfactants on Clearing Efficiency |
| Type |
Journal Article |
| Abstract |
The rapidly increasing production of engineered nanoparticles has created a demand for particle removal from industrial and communal wastewater streams. Efficient removal is particularly important in view of increasing long-term persistence and evidence for considerable ecotoxicity of specific nanoparticles. The present work investigates the use of a model wastewater treatment plant for removal of oxide nanoparticles. While a majority of the nanoparticles could be captured through adhesion to clearing sludge, a significant fraction of the engineered nanoparticles escaped the wastewater plant's clearing system, and up to 6 wt % of the model compound cerium oxide was found in the exit stream of the model plant. Our study demonstrates a significant influence of surface charge and the addition of dispersion stabilizing surfactants as routinely used in the preparation of nanoparticle derived products. A detailed investigation on the agglomeration of oxide nanoparticles in wastewater streams revealed a high stabilization of the particles against clearance (adsorption on the bacteria from the sludge). This unexpected finding suggests a need to investigate nanoparticle clearance in more detail and demonstrates the complex interactions between dissolved species and the nanoparticles within the continuously changing environment of the clearing sludge. |
| Document Number |
BIN.TP.NA.5.2 |
| Book Title |
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| Pages |
5828-5833 |
| Conference Name |
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| Editor |
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| Conference Location |
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| Keywords |
oxide nanoparticles, nanoparticle clearance, wastewater treatment, clearing sludge, adsorption |
| Date |
2008 |
| Publisher |
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| Volume |
42 (15) |
| Journal |
Environ. Sci. Technol. |
| Author |
Limbach, L.K., R.Bereiter, E. Müller, R. Krebs, R. Gälli, and W.J. Stark |
| Institution |
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| Type of Work |
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| Place Published |
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| Report Number |
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| University |
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| Thesis Type |
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| Magazine |
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| Newspaper |
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