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Hexane biodegradation in two-liquid phase bioreactors: High-performance operation based on the use of hydrophobic biomass

Paper ID Volume ID Publish Year Pages File Format Full-Text
3436 171 2013 8 PDF Available
Title
Hexane biodegradation in two-liquid phase bioreactors: High-performance operation based on the use of hydrophobic biomass
Abstract

An innovative operation mode in two-liquid phase bioreactors (TLPB) for the treatment of volatile organic compounds (VOC) was investigated. This mode was based on confining the biocatalytic activity exclusively in the non-aqueous phase (NAP) by using hydrophobic microorganisms. The TLPB was implemented in a 2.5 L stirred tank reactor using 10% (v/v) of silicone oil as NAP and hexane as model VOC. A stable elimination capacity (EC) of 21.0 ± 2.5 g m−3 h−1 (corresponding to a removal efficiency of 80%) was recorded for 26 days. The accumulation of inhibitory metabolites resulted in drastic drops in the elimination capacity (EC) and an unstable performance of the system, hexanol being identified as potential inhibitory metabolite. Aqueous culture broth exchange by fresh mineral salt medium at a dilution rate of 0.2 day−1 allowed maintaining a high and sustained VOC removal performance. Dissolved oxygen concentration measurements revealed that the oxidative metabolism was strongly stimulated by the aqueous broth exchange. The temporary blockage of the gas/water/NAP transfer pathway for O2 highlighted the paramount role of this pathway on the performance of the TLPB based on hydrophobic microorganisms.

► An innovative operation mode in two-liquid phase bioreactors (TLPBs) for the treatment of volatile organic compounds (VOC) was investigated. ► The novel operation mode was based on confining the biocatalytic activity in the non-aqueous phase. ► A stable elimination capacity (EC) of 21.0 ± 2.5 g m−3 h−1 (corresponding to a removal efficiency of 80%) was recorded for 26 days. ► Aqueous culture broth exchange by fresh mineral salt medium allowed maintaining a high and sustained VOC removal performance.

Keywords
Biological gas treatment; Hexane; Hydrophobic microorganisms; Two-liquid phase bioreactors; Volatile organic compounds
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Hexane biodegradation in two-liquid phase bioreactors: High-performance operation based on the use of hydrophobic biomass
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Publisher
Database: Elsevier - ScienceDirect
Journal: Biochemical Engineering Journal - Volume 70, 15 January 2013, Pages 9–16
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us