Remediation technologies of oil contaminated soils are based on physicochemical, thermal and biological treatments. Within the latter, bioremediation proved to be an efficient and sustainable technology, commonly performed by adding synthetic fertilizers (F) and control of the environmental conditions process. This work, carry out at laboratory-scale, study the efficacy of adding biosolids (B) and composted biosolids (CB) compared to bioremediation conventional methods in north Patagonian soils contaminated with oil. We study the petroleum hydrocarbons degradation rate by applying B and CB vs conventional treatments: F addition and landfarming method, aeration, tillage and wetting (LH). The obtained results shows a statistically significant difference in the degradation kinetics, where B> CB> F> LH. The heavy hydrocarbon fraction (HFP), considered resistant to biodegradation sho...