Remediation of used lubricating oil contaminated soil using organic waste amendments

摘要

Contamination of soil by used lubricating oil is more prominent in developing countries. This poses a serious threat to the flora and fauna in the environment. Soil contaminated with 5%, 10% and 15% (w/w) used lubricating oil was amended with organic wastes [banana skin (BS), brewery spent grain (BSG) and spent mushroom compost (SMC)]. The study was 昪onducted under natural conditions for 12 months to determine the effects of each organic waste on biodegradation of used lubricating oil. GC/FID results of the oil extracts at the end of 12 months showed complete degradation below detection limit for C7 to C hydrocarbon fractions, in all the organic wastes amended treatments for 5% and 10% oil pollution. C7 to C_(14) hydrocarbon fractions were not completely degraded in unamended soil and all treatments with 15% oil pollution, except BSG amended soil. BSG amended soil recorded better degradation of C29 to C36 fractions from 6871 mg/kg to 800 mg/kg, compared to BS and SMC treated soil. Complete degradation of fluorene, phenanthrene, anthracene and pyrene below detection limits were recorded in BSG treated soil after 12 months in 5%, 10% arid 15% oil pollution. The results of this study attest to the potential of BSG in enhancing oil biodegradation in soil. Hence, BSG can serve as a good candidate for promoting biodegradation of used lubricating oil in soil environment.