Fate of cerium dioxide (CeO 2) nanoparticles in municipal wastewater during activated sludge treatment

Francisco Gómez-Rivera, James A Field, Dustin Brown, Maria Reye Sierra Alvarez

Research output: Contribution to journalArticle

67 Citations (Scopus)

Abstract

This study investigated the fate of nano-CeO 2 during municipal wastewater treatment using a laboratory-scale activated sludge (A/S) system fed with primarily-treated municipal wastewater and nano-CeO 2 (55.0mg Ce/L). Nano-CeO 2 was highly removed during A/S treatment (96.6% total Ce). Extensive removal of CeO 2 <200nm was also attained and the concentration escaping treatment was only 0.11mg Ce/L. Elimination occurred mainly by aggregation and settling of CeO 2 particles, promoted by circumneutral pH values and by nanoparticle interactions with organic and/or inorganic wastewater constituents. Biosorption also contributed to CeO 2 removal as shown by sludge analysis and batch adsorption studies. Batch bioassays demonstrated that nano-CeO 2 only exerted inhibition of O 2 uptake by A/S at concentrations exceeding those in the bioreactor feed (50% inhibition at 950mg CeO 2/L). These findings indicate that A/S treatment is expected to provide extensive removal of nano-CeO 2 in municipal wastewaters.

Original languageEnglish (US)
Pages (from-to)300-304
Number of pages5
JournalBioresource Technology
Volume108
DOIs
StatePublished - Mar 2012

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cerium
Cerium
activated sludge
Wastewater
Nanoparticles
wastewater
Biosorption
Bioassay
Bioreactors
Wastewater treatment
Agglomeration
bioreactor
Adsorption
bioassay
sludge
adsorption
nanoparticle
sludge treatment
ceric oxide
removal

Keywords

  • Aerobic inhibition
  • Aerobic wastewater treatment
  • Biosorption
  • Nanoparticle removal

ASJC Scopus subject areas

  • Bioengineering
  • Environmental Engineering
  • Waste Management and Disposal

Cite this

Fate of cerium dioxide (CeO 2) nanoparticles in municipal wastewater during activated sludge treatment. / Gómez-Rivera, Francisco; Field, James A; Brown, Dustin; Sierra Alvarez, Maria Reye.

In: Bioresource Technology, Vol. 108, 03.2012, p. 300-304.

Research output: Contribution to journalArticle

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