Characterization of Hydrocarbon-Degrading Bacteria in Constructed Wetland Microcosms Used to Treat Crude Oil Polluted Water

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  • Amer Jamal Hashmat, Pakistan Institute of Engineering and Applied Sciences, Soil and Environmental Biotechnology Division, National Institute for Biotechnology and Genetic Engineering (NIBGE)
  • ,
  • Muhammad Afzal, National Institute for Biotechnology and Genetic Engineering (NIBGE)
  • ,
  • Kaneez Fatima, National Institute for Biotechnology and Genetic Engineering (NIBGE)
  • ,
  • Muhammad Anwar-ul-Haq, National Institute for Biotechnology and Genetic Engineering (NIBGE)
  • ,
  • Qaiser Mahmood Khan, National Institute for Biotechnology and Genetic Engineering (NIBGE)
  • ,
  • Carlos A. Arias
  • Hans Brix

Ten plant species were grown in constructed wetlands (CWs) to remediate water containing 2% (w/v) crude oil. The plant species with better growth and biomass production were Typha latifolia and Cyperus laevigatus, and they were significantly correlated (R2 = 0.91) with hydrocarbon degradation. From T. latifolia and C. laevigatus, 33 hydrocarbon-degrading bacterial strains were isolated from the rhizosphere, and root and shoot interiors. More diversified bacteria were found in the rhizosphere and endosphere of C. laevigatus than those of T. latifolia. The predominant cultural hydrocarbon-degrading bacteria were shown to belong to the genera Pseudomonas, Acinetobacter and Bacillus. In addition to genes involved in hydrocarbon degradation, most of the bacteria displayed multiple plant growth promoting (PGP) activities. This study suggests the importance of selecting suitable bacterial strains with hydrocarbon degradation and PGP activities for improving the efficacy of CWs used in remediating water contaminated with crude oil.

OriginalsprogEngelsk
TidsskriftBulletin of Environmental Contamination and Toxicology
Vol/bind102
Nummer3
Sider (fra-til)358-364
Antal sider7
ISSN0007-4861
DOI
StatusUdgivet - 2019

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