Aerobic degradation of a toluene plume in homogeneous and heterogeneous porous media

M. Rolle, R. Bauer, C. Griebler, R. Meckenstock, S. Bauer, O. Kolditz, P. Grathwohl

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review

Abstract

Degradation of aromatic hydrocarbons at the fringe of groundwater plumes is predominantly based on microbial transformations for which dispersive mixing at the pore-scale level constitutes the main driving force. The aim of the study was to compare the microbial degradation activity at the plume fringe in homogeneous and heterogeneous porous media. In two identical quasi two-dimensional flow-through microcosms, resembling a longitudinal section of an aquifer, a toluene plume was conveyed through (a) homogeneously distributed fine grained sediments and through (b) a heterogeneous set-up characterized by the inclusion of two subsequent rectangular high-conductivity (i.e. coarser grains) lenses. The experimental results showed that the contaminant removal by the aerobic toluene degrader Pseudomonas putida strain F1 was more effective in the heterogeneous system. The observed degradation enhancement was comprised in a range of 23-84%. Reactive transport modelling of the two-dimensional microcosm experiments showed that the governing processes of mixing of the reactants and kinetic degradation can explain the observed results well. Copyright

Original languageEnglish
Title of host publicationGroundwater Quality
Subtitle of host publicationSecuring Groundwater Quality in Urban and Industrial Environments, GQ'07
Pages356-363
Number of pages8
Edition324
StatePublished - 2008
Externally publishedYes
EventGroundwater Quality 2007 Conference - Securing Groundwater Quality in Urban and Industrial Environments, GQ'07 - Fremantle, WA, Australia
Duration: 2 Dec 20087 Dec 2008

Publication series

NameIAHS-AISH Publication
Number324
ISSN (Print)0144-7815

Conference

ConferenceGroundwater Quality 2007 Conference - Securing Groundwater Quality in Urban and Industrial Environments, GQ'07
Country/TerritoryAustralia
CityFremantle, WA
Period2/12/087/12/08

Keywords

  • Biodegradation
  • Dispersive mixing
  • Heterogeneity
  • Pseudomonas putida F1
  • Reactive transport modelling

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