Abstract

VALLEJO QUINTERO, Victoria Eugenia; SANDOVAL COBO, John Jairo; GARAGOA BARAHONA, Sandra Catalina  and  BASTOS ARENAS, Johannes. Evaluation of the biostimulation over the bioremediation of hydrocarbons in contaminated soils with tar in Soacha, Cundinamarca- Colombia. Acta Agron. [online]. 2016, vol.65, n.4, pp.354-361. ISSN 0120-2812.  https://doi.org/10.15446/acag.v65n4.51013.

In this research, the effect of biostimulation on the bioremediation of a soil contaminated with tar generated during the production of artisanal charcoal was evaluated. Eight (8) laboratory mesocosm (n=2) containing tar-contaminated soil (12,000 mgTPH/kgps) taken from an artisanal charcoal factory were evaluated during 60 days under two land farming treatments and two control systems: addition of inorganic compound fertilizer (FIC), addition of urea plus K₂HPO₄ (U), abiotic control and natural attenuation. In addition, the performance of the bioremediation treatments was evaluated through monitoring of physiochemical (temperature, pH, moisture content, organic carbon, nutrients and total petroleum hydrocarbons-TPHs) and microbiological parameters (heterotrophic plate count microorganisms and degraders of tar). The highest removal percentage of TPH was obtained through FIC treatment (28%), followed by treatment with U (24%) and natural attenuation (6%). It was concluded that the addition of nutrients stimulated a growth in the density of heterotrophic microorganisms and degraders, which optimized the biodegradation process of the soil contaminated with tar, as evidenced by a significant decrease in the concentration of TPH for the treatments at the end of the study.

Keywords : Biological treatments; landfarming; Soil remediation; Tar; Total Petroleum Hydrocarbons (TPHs).

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