<strong>Phytoremediation of Polycyclic Aromatic Hydrocarbons in Soils Artificially Polluted Using Plant-Associated-Endophytic Bacteria and <em>Dactylis glomerata</em> as the Bioremediation Plant</strong>
Journal Title: Polish Journal of Microbiology - Year 2015, Vol 64, Issue 3
Abstract
The reaction of soil microorganisms to the contamination of soil artificially polluted with polycyclic aromatic hydrocarbons (PAHs) was evaluated in pot experiments. The plant used in the tests was cock’s foot ([i]Dactylis glomerata[/i]). Three different soils artificially contaminated with PAHs were applied in the studies. Three selected PAHs (anthracene, phenanthrene, and pyrene) were used at the doses of 100, 500, and 1000 mg/kg d.m. of soil and diesel fuel at the doses of 100, 500, and 1000 mg/kg d.m. of soil. For evaluation of the synergistic effect of nitrogen fixing bacteria, the following strains were selected: associative [i]Azospirillum[/i] spp. and [i]Pseudomonas stutzerii.[/i] Additionally, in the bioremediation process, the inoculation of plants with a mixture of the bacterial strains in the amount of 1 ml suspension per 500 g of soil was used. Chamber pot-tests were carried out in controlled conditions during four weeks of plant growth period. The basic physical, microbiological and biochemical properties in contaminated soils were determined. The obtained results showed a statistically important increase in the physical properties of soils polluted with PAHs and diesel fuel compared with the control and also an important decrease in the content of PAHs and heavy metals in soils inoculated with [i]Azospirillum[/i] spp. and [i]P. stutzeri [/i]after cock’s foot grass growth. The bioremediation processes were especially intensive in calcareous rendzina soil artificially polluted with PAHs.
Authors and Affiliations
Anna Gałązka, Karolina Gawryjołek, Rafał Gałązka
Keywords
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