RT info:eu-repo/semantics/article
T1 Evaluation of biostimulation, bioaugmentation, and organic amendments application on the bioremediation of recalcitrant hydrocarbons of soil
A1 Curiel Alegre, Sandra
A1 Velasco Arroyo, Blanca
A1 Rumbo Lorenzo, Carlos
A1 Khan, Aqib Hassan Ali
A1 Tamayo Ramos, Juan Antonio
A1 Rad Moradillo, Juan Carlos
A1 Gallego, José Luis
A1 Barros García, Rocío
K1 Biostimulation
K1 Bioaugmentation
K1 Phospholipid fatty acids
K1 Total petroleum hydrocarbons polluted soils
K1 Soil enzymes
K1 Materiales
K1 Materials
AB In the present work, the operational conditions for improving the degradation rates of Total Petroleum Hydrocarbons (TPHs) in contaminated soil from a machinery park were optimized at a microcosms scale along a 90-days incubation period. In this study, bioremediation strategies and an organic amendment have been tested toverify the remediation of soil contaminated with different hydrocarbons, mineral oils, and heavy metals. Specifically, designed biostimulation and bioaugmentation strategies were compared with and without addingvermicompost. The polluted soil harboring multiple contaminants, partially attenuated for years, was used. Theinitial profile showed enrichment in heavy linear alkanes, suggesting a previous moderate weathering. Theapplication of vermicompost increased five and two times the amounts of available phosphorus (P) andexchangeable potassium (K), respectively, as a direct consequence of the organic amendment addition. Themicrobial activity increased due to soil acidification, which influenced the solubility of P and other micronutrients. It also impacted the predominance and variability of the different microbial groups and the incubation,as reflected by phospholipid fatty acid (PLFA) results. An increase in the alkaline phosphatases and proteaseslinked to bacterial growth was displayed. This stimulation of microbial metabolism correlated with the degradation rates since TPHs degradation’ efficiency after vermicompost addition reached 32.5% and 34.4% of theinitial hydrocarbon levels for biostimulation and bioaugmentation, respectively. Although Polycyclic Aromatic Hydrocarbons (PAHs) were less abundant in this soil, results also decreased, especially for the most abundant, thephenanthrene. Despite improving the degradation rates, results revealed that recalcitrant and hydrophobic petroleum compounds remained unchanged, indicating that mobility, linked to bioavailability, probably representsthe limiting step for further soil recovery.
PB Elsevier
SN 0045-6535
YR 2022
FD 2022-11
LK http://hdl.handle.net/10259/7423
UL http://hdl.handle.net/10259/7423
LA eng
NO This work is funded by the GREENER project of the European Union’s Horizon 2020 research and innovation program (Grant Agreement No. 826312). S. Curiel pre-doctoral contract was funded by Junta de Castilla y Leon ´ (ORDEN EDU/1508/2020, de 15 de diciembre).
DS Repositorio Institucional de la Universidad de Burgos
RD 28-abr-2024