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International Journal of Environment Science and Technology
Center for Environment and Energy Research and Studies (CEERS)
ISSN: 1735-1472
EISSN: 1735-2630
Vol. 12, No. 7, 2015, pp. 2317-2326
Bioline Code: st15218
Full paper language: English
Document type: Research Article
Document available free of charge

International Journal of Environment Science and Technology, Vol. 12, No. 7, 2015, pp. 2317-2326

 en Autochthonous bioaugmentation to enhance phenanthrene degradation in soil microcosms under arid conditions
Madueño, L.; Alvarez, H. M. & Morelli, I. S.

Abstract

The aim of this work was to investigate the effect of autochthonous bioaugmentation (ABA) in phenanthrenecontaminated Patagonian soil microcosms, maintained under arid conditions, on phenanthrene elimination and soil microbial community. The polycyclic aromatic hydrocarbon (PAH)-degrading strain Sphingobium check for this species in other resources sp. 22B previously isolated from the Patagonian soil and selected by its resistance to drying conditions was used as inoculant. The phenanthrene concentration, dehydrogenase activity and denaturing gradient electrophoresis of 16S rRNA gene were monitored during 230 days. The results showed that when the microcosms were maintained at 20 % of soil waterholding capacity (WHC), the phenanthrene biodegradation was drastically inhibited and changes in the genetic diversity of soil microbial community were not detected, and neither the ABA nor the biostimulation managed to overcome the inhibitory effects. When the moisture was slightly increased, reached 25 % WHC, the ABA showed a significant initial stimulatory effect on phenanthrene biodegradation, demonstrating the potential ofABAinPAH bioremediation process in semiarid Patagonia.

Keywords
Polycyclic aromatic hydrocarbons; Autochthonus bioaugmentation; Sphingobium; Patagonian soil

 
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