Assessment of bioremediation of aliphatic, aromatic, resin, and asphaltene fractions of oil-sludge-contaminated soil

Abstract

Oil sludge is a viscous material consisting of resin, asphaltene, sand, and water, which is usually formed at the bottom of oil reservoir tanks. Asphaltene and resin contents of oil sludge make it more resistant to biodegradation. Disposal of oil sludge is the main problem of oil industry; discharge of oil sludge into the soil causes damage to the environment. Bioremediation is an efficient, cheap, and environmentally friendly method for oil-sludge treatment. The aim of this study was to investigate the biodegradation of oil-sludge fractions in contaminated soil for a period of 12 months. The oil sludge was mixed with soil with the final concentration of 5 % (w/w), and the nutrients such as phosphate and nitrate salts were added to soil. Finally, reduction of aliphatic, aromatic, resin, and asphaltene was tested. The results showed that the reduction of total petroleum hydrocarbon was 31 ± 5 % during 12 months of the treatment. About 60 ± 8 % of total aliphatic fractions, mainly C 14 -C 22 , decreased. Analysis for the detection of two, three, and four rings of polycyclic aromatic hydrocarbons demonstrated about 42 ± 3 % reduction of total aromatic fractions, whereas the resin (6 ± 0.8 %) and asphaltene (4 ± 0.5 %) fractions were slightly biodegraded. In conclusion, biotreatment of oil sludge during 12 months could well reduce aliphatic and aromatic fractions, but more time is needed for resin and asphaltene reduction.

Biodegradation and phytotoxicity of crude oil hydrocarbons in an agricultural soil

“…This is due to the fact that this fraction consists mainly of complex structure molecules that are resistant to microbial attack (Atlas and Hazen, 2011). These molecules include resins, N, S and oxygen heterocyclic compounds (Minai-Tehrani et al, 2015). However, Jahangeer and Kumar (2013) reported that some of oil utilizers, especially fungi, were well able to degrade the resin molecules.…”

Biodegradación de dos residuos de estaciones de servicio en Río Gallegos - Argentina

“…Para la identificación y cuantificación se utilizó un cromatógrafo de gases marca Agilent, modelo 7890B con detector tipo FID, según TNRCC 1005. Por otro lado, se determinaron los índices C17/pristano y C18/fitano que permiten establecer si la disminución de hidrocarburos en los sistemas en estudio se debe a un proceso de biodegradación (Minai Tehrani et al, 2015). De esta manera se calculan los mencionados índices que comparan un hidrocarburo altamente biodegradable como el n-alcano heptadecano (C17) o el octadecano (C18) con los isoprenoides muy poco biodegradables como el pristano o el fitano.…”

Planejamento e otimização do tratamento por ozonização da água de lavagem da borra oleosa do refino do petróleo

“…Pela análise da Figura 2, é possível notar a estreita relação da redução de DQO com o pH e do custo com o tempo e a potência. Essas relações são fundamentadas conforme a discussão apresentada anteriormente e vão de encontro aos resultados já obtidos por outros pesquisadores sob as mesmas condições (LOPES, 2015;MONTGOMERY, 2006;TCHOBANOGLOUS;BURTON;STENSEL, 2003;MASTEN & DAVIES, 1994). Entre as condições ótimas, aquela com redução de DQO de 51,1% e custo de R$ 151,5.kW -1 .h -1 foi selecionada para teste.…”