Evaluation of the Adsorbent Potential of Used Tire Material for the Remediation of Hydrocarbon-Contaminated Soils in the Peruvian Amazon

Aguila A.D.; Espinosa E.; Tinoco O.; Huaricallo Y. · Annales de Chimie: Science des Materiaux (2025) · DOI: 10.18280/acsm.490304

Resumen

A remediation strategy for tropical soils contaminated with petroleum hydrocarbons was evaluated. The objective of this research was to evaluate the most efficient particle size of the NFU (Disused Neomatic) in the absorption of the remaining crude oil and to determine the decrease in volatiles after a spill in three types of Amazonian soils of different textures; Determine the type of soil where the NFU is most effective in order to propose improvements in the decontamination process. Three soil mixtures M1, M2 and M3 with different proportions of clayey, sandy, silty and peat soil were characterized. Duplicate samples (M1-D, M2-D, M3-D) were worked in parallel to validate the results under replicated conditions, differentiated by their textural content and proportion of peat. A crude oil spill (24°API) was simulated, incorporating 12-mesh NFU particles, and the F1–F3 fractions of total petroleum hydrocarbons were monitored using EPA method 8015. The NFU showed a maximum adsorption capacity of 1.976 g/g after 20 minutes of contact, higher than that of 8-mesh NFU (1.462 g/g). Spectroscopic analysis confirmed a predominant surface adsorption mechanism. Bioassay tests with Petroselinum crispum indicated that parsley germination and growth were higher in NFU-treated soils, especially in M1, with an average growth of 24.5 cm in 5 months. A significant reduction in the F2 fraction of TPH was observed in M3-D soils (from 2236.58 to 862.75 mg/kg), suggesting a combined effect of physical adsorption and favorable soil conditions. NFUs showed potential to reduce hydrocarbon compounds and facilitate plant recovery, thus contributing to environmental remediation.

Instituciones: Universidad Nacional Mayor de San Marcos