Biostimulation potentials of corn steep liquor in enhanced hydrocarbon degradation in chronically polluted soil
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Date
2019-01-23
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Journal Title
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Volume Title
Publisher
Springer : Biotech
Abstract
The effects of corn steep liquor (CSL) on hydrocarbon degradation and microbial community structure and function was
evaluated in field-moist soil microcosms. Chronically polluted soil treated with CSL (AB4) and an untreated control (3S)
was compared over a period of 6 weeks. Gas chromatographic fingerprints of residual hydrocarbons revealed removal of
95.95% and 94.60% aliphatic and aromatic hydrocarbon fractions in AB4 system with complete disappearance of nC1–
nC8, nC10,
nC15,
nC20–
nC23 aliphatics and aromatics such as naphthalene, acenaphthylene, fluorene, phenanthrene, pyrene,
benzo(a)anthracene, and indeno(123-cd)pyrene in 42 days. In 3S system, there is removal of 61.27% and 66.58% aliphatic
and aromatic fractions with complete disappearance of nC2
and nC21
aliphatics and naphthalene, acenaphthylene, fluorene,
phenanthrene, pyrene, and benzo(a)anthracene aromatics in 42 days. Illumina shotgun sequencing of the DNA extracted
from the two systems showed the preponderance of Actinobacteria (31.46%) and Proteobacteria (38.95%) phyla in 3S and
AB4 with the dominance of Verticillium (22.88%) and Microbacterium (8.16%) in 3S, and Laceyella (24.23%), Methylosinus
(8.93%) and Pedobacter (7.73%) in AB4. Functional characterization of the metagenomic reads revealed diverse metabolic
potentials and adaptive traits of the microbial communities in the two systems to various environmental stressors. It also
revealed the exclusive detection of catabolic enzymes in AB4 system belonging to the aldehyde dehydrogenase superfamily.
The results obtained in this study showed that CSL is a potential resource for bioremediation of hydrocarbon-polluted soils.
Description
Staff Publication
Keywords
Corn steep liquor, Hydrocarbon-polluted soil, Soil microcosm, Illumina shotgun sequencing, Microbial community structur, Bioremediation
Citation
Salam, L. B., & Ishaq, A. (2019). Biostimulation potentials of corn steep liquor in enhanced hydrocarbon degradation in chronically polluted soil. 3 Biotech, 9(2). doi:10.1007/s13205-019-1580-4