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Related Experiment Videos

BTE-OX biodegradation kinetics with MTBE through bioaugmentation.

K Acuna-Askar1, J F Villarreal-Chiu, M V Gracia-Lozano

  • 1Laboratorio de Biorremediacion Ambiental, Facultad de Medicina, UANL, Madero Pte y Dr Aguirre, 64460 Monterrey, NL, Mexico. kaskar@fm.uanl.mx

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|October 23, 2004
PubMed
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Bioaugmented bacteria efficiently degraded benzene, toluene, and ethylbenzene (BTE-oX), but showed varied kinetics for o-xylene and methyl tert-butyl ether (MTBE). Soil presence impacted biodegradation rates, while Tergitol NP-10 enhanced removal.

Area of Science:

  • Environmental microbiology
  • Bioremediation kinetics
  • Organic pollutant degradation

Background:

  • Bioaugmentation is a promising strategy for remediating contaminated sites.
  • Understanding biodegradation kinetics is crucial for optimizing bioremediation processes.
  • Mixed contaminants like benzene, toluene, ethylbenzene, o-xylene (BTE-oX), and methyl tert-butyl ether (MTBE) pose complex degradation challenges.

Purpose of the Study:

  • To investigate the biodegradation kinetics of BTE-oX and MTBE using bioaugmented bacterial populations.
  • To evaluate the influence of soil and Tergitol NP-10 on the biodegradation rates of these contaminants.
  • To determine the specific kinetic models governing the degradation of each compound.

Main Methods:

  • Biodegradation kinetics were assessed over 36 hours with measurements every 6 hours.

Related Experiment Videos

  • Experiments included aqueous samples with bioaugmented bacteria (up to 880 mg/L VSS) and variations with soil and Tergitol NP-10.
  • Kinetic models (first-order one-phase, first-order two-phase, zero-order) were applied to fit the observed degradation data.

    • Main Results:

    • Benzene and o-xylene followed first-order one-phase kinetics; toluene and ethylbenzene followed first-order two-phase kinetics.
    • MTBE exhibited zero-order removal kinetics across all tested conditions.
    • Soil presence generally retarded BTE-oX removal (especially o-xylene) but enhanced MTBE removal.
    • Tergitol NP-10 addition positively affected substrate removal rates in soil-containing aqueous samples.
    • High percent removals (95.4-99.7%) were observed for benzene, toluene, and ethylbenzene.

    Conclusions:

    • Bioaugmented bacteria demonstrate effective degradation of BTE-oX compounds, with distinct kinetic behaviors.
    • The presence of soil and surfactants significantly influences the biodegradation pathways and rates of mixed contaminants.
    • Optimized bioremediation strategies may require tailored approaches considering soil matrix effects and additive impacts.