Addressing biofilter limitations: A two-phase partitioning bioreactor process for the treatment of benzene and toluene contaminated gas streams

被引:0
作者
Colin T. Davidson
Andrew J. Daugulis
机构
[1] Queen's University,Department of Chemical Engineering
来源
Biodegradation | 2003年 / 14卷
关键词
degradation; partitioning bioreactor; toluene;
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摘要
A two-phase partitioning bioreactor (TPPB) achievedsimultaneous and continuous removal and degradation of benzene and toluene froman air stream. The aqueous-organic system utilized n-hexadecane as the organicphase, and the organism Alcaligenes xylosoxidans Y234 in the aqueous phaseto achieve the degradation of benzene and toluene. The system, which operates asa well-mixed dispersion and is therefore resistant to substrate surges, was firstshown to be capable of utilizing toluene while operating at a loading capacity of 235 g m-3 h-1with an elimination capacity of 233 g m-3 h-1. It was also determined that to characterize TPPB performance in terms of elimination capacity thedefinition of elimination capacity must be extended to include the cell mass present, a readilycontrollable variable given the nature of the system. Based on this criterion, it wasestimated that for a cell concentration of 1 g l-1 present in the TPPB, thepotential maximum toluene elimination capacity is 1290 g m-3 h-1 whichis substantially higher than any toluene elimination capacity achieved by biofiltersat a high removal efficiency. If no other factor were to limit the system, eliminationcapacities could be many times higher still, and are dependent on maintaining desiredcell concentrations above 1 g l-1. The TPPB was then operated at nominalloading capacities of 63 g m-3h-1 (benzene) and 51 g m-3 h-1 (toluene) at a removal efficiency greater than 99% to demonstratedthe applicability of this system in dealing with two chemical species simultaneously. TPPBsystems therefore have been shown to be effective at removing gaseous organiccontaminants at high removal efficiencies while also possessing desirable operatingfeatures, such as providing and maintaining high cell concentrations throughout thereactor, and a capacity to effectively deal with high contaminant loadings.
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页码:415 / 421
页数:6
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  • [1] Abumaizar RJ(1997)Analytical model of dual-media biofilter for removal of organic air pollutants J. Environ. Eng. 123 606-614
  • [2] Smith EH(2000)Influence of mixing and water addition on the removal rate of toluene vapors in a biofilter Biotechnol. Bioeng. 68 448-455
  • [3] Kocher W(1996)Use of a two-phase partitioning bioreactor for the biodegradation of phenol Biotechnol. Techniques 10 643-648
  • [4] Auria R(1997)Biodegradation of phenol at high initial concentrations in two-phase partitioning batch and fed-batch bioreactors Biotechnol. Bioeng. 55 155-161
  • [5] Frere G(1997)Characterization and optimization of a two-phase partitioning bioreactor for the biodegradation of phenol Appl. Microbiol. Biotechnol. 48 18-22
  • [6] Morales M(1999)Benzene/toluene/p-xylene degradation part 1. Solvent selection and toluene degradation in a two-phase partitioning bioreactor Appl. Microbiol. Biotechnol. 52 354-359
  • [7] Acuna ME(1999)Simultaneous biodegradation of benzene, toluene, and p-xylene in a two-phase partitioning bioreactor: Concept demonstration and practical application Biotechnol. Progress 15 74-80
  • [8] Revah S(2000)Toluene degradation in the recycle liquid of biotrickling filters for air pollution control Appl. Microbiol. Biotechnol. 54 133-137
  • [9] Collins LD(2001)Two-phase partitioning bioreactors: A new technology platform for destroying xenobiotics Trends Biotechnol. 19 459-464
  • [10] Daugulis AJ(2003)The treatment of gaseous benzene by two-phase partitioning bioreactors: A high performance alternative to the use of biofilters Appl. Microbiol. Biotechnol. 62 297-301