Natural attenuation, biostimulation and bioaugmentation on remediation of biodiesel contaminated soils
Biodiesel has emerged as an interesting energy option to the shortage of petroleum products, the main source of energy for mankind, so it is relevant to focus the study of the life cycle of biodiesel on the ground because it acts as an acceptor and final deposit of the waste generated by the biofuel industry. The objectives of this study are: to compare natural attenuation, biostimulation and bioaugmentation as bioremediation techniques in biodiesel contaminated soils in a pot trial and evaluate the impact of such practices on some soil properties. The design consisted of 5 treatments with 3 replications; soil without pollution (L), soil + biodiesel (LB), soil + biodiesel + inorganic fertilizer (LBF), soil + compost + biodiesel (LBC), soil + biodiesel + hydrocarbon degraders (LBM). Single samples were taken in the first 20 cm depth, at baseline T0, T1 (1 month), T3 (3 months), T6 (6 months), and a year (T12). Edaphic variables studied were TPH (total petroleum hydrocarbons), pH, organic carbon (% C), nitrate (NO3) and phosphorus (P). Organic biostimulation treatments (LBC) and bioaugmentation (LBM) were more efficient in the degradation of biodiesel. The contamination resulted in a decrease in the pH value of the soil. Contamination with biodiesel produced a decrease in soil pH and an increase in the content of organic carbon.
BIODIESEL BIOREMEDIATION EDAPHIC PROPERTIES