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Toluene biodegradation in a solid/liquid system involving immobilized activated sludge and silicone oil as pollutant reservoir.

Authors
  • Diz Castro, Manuel
  • Gómez-Díaz, Diego
  • Amrane, Abdeltif
  • Couvert, Annabelle
Type
Published Article
Journal
Environmental Technology
Publisher
Informa UK Limited
Publication Date
Jan 01, 2015
Volume
36
Issue
1-4
Pages
450–454
Identifiers
DOI: 10.1080/09593330.2014.951402
PMID: 25187471
Source
Medline
Keywords
License
Unknown

Abstract

A solid/liquid system involving activated sludge immobilized in an agar medium and a non-aqueous phase liquid containing the target pollutant has been considered to treat a model hydrophobic volatile organic compound, toluene. The positive impact of the use of a multiphase bioreactor is that the organic phase constitutes a pollutant reservoir and also helps to overcome possible pollutant toxicity. In addition and to overcome the drawbacks of the use of a solid organic phase (high pressure drop and low mass transfer) instead of a liquid organic phase, the considered solid phase was the aqueous. Consequently, silicone oil (polydimethylsiloxane) which showed its relevance for implementation in multiphase bioreactors was used. Promising results were observed from the analysis of toluene in the gaseous phase; for an initial amount of 2 g L(-1) related to the organic phase, a v/v ratio of 0.5 of the organic phase to the aqueous agar phase, total toluene consumption was observed in about 9 days, leading to a global biodegradation rate of approximately 3.1 mg L(-1) h(-1), namely in the range of values previously observed in liquid/liquid systems.

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