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Evaluation of fatty acid derivatives in the remediation of aged PAH-contaminated soil and microbial community and degradation gene response
- Source :
- Chemosphere. 248
- Publication Year :
- 2019
-
Abstract
- In this study, derivatives of two common fatty acids in plant root exudates, sodium palmitate and sodium linoleate (sodium aliphatates), were added to an aged Polycyclic aromatic hydrocarbons (PAHs) contaminated soil to estimate their effectiveness in the removal of PAHs. Sodium linoleate was more effective in lowering PAHs and especially high-molecular-weight (4-6 ring) PAHs (HMW-PAHs). Principal coordinates analysis (PCoA) indicates that both amendments led to a shift in the soil bacterial community. Moreover, linear discriminant effect size (LEfSe) analysis demonstrates that the specific PAHs degraders Pseudomonas, Arenimonas, Pseudoxanthomonas and Lysobacter belonging to the γ-proteobacteria and Nocardia and Rhodococcus belonging to the Actinobacteria were the biomarkers of, respectively, sodium linoleate and sodium palmitate amendments. Correlation analysis suggests that four biomarkers in the sodium linoleate amendment treatment from γ-proteobacteria were all highly linearly negatively related to HMW-PAHs residues (p 0.01) while two biomarkers in the sodium palmitate amendment treatment from Actinobacteria were highly linearly negatively related to LMW-PAHs residues (p 0.01). Higher removal efficiency of PAHs (especially HMW-PAHs) in the sodium linoleate amendment treatment than in the sodium palmitate amendment treatment might be ascribed to the specific enrichment of microbes from the γ-proteobacteria. The bacterial functional KEGG orthologs (KOs) assigned to PAHs metabolism and functional C23O and C12O genes related to cleavage of the benzene ring were both up-regulated. These results provide new insight into the mechanisms of the two sodium aliphatate amendments in accelerating PAHs biodegradation and have implications for practical application in the remediation of PAHs-contaminated soils.
- Subjects :
- Environmental Engineering
Environmental remediation
Health, Toxicology and Mutagenesis
Sodium
0208 environmental biotechnology
chemistry.chemical_element
02 engineering and technology
Lysobacter
010501 environmental sciences
complex mixtures
01 natural sciences
Plant Roots
Actinobacteria
Soil
Pseudoxanthomonas
Environmental Chemistry
Soil Pollutants
Polycyclic Aromatic Hydrocarbons
Environmental Restoration and Remediation
Soil Microbiology
0105 earth and related environmental sciences
biology
Bacteria
Microbiota
Pseudomonas
Fatty Acids
Public Health, Environmental and Occupational Health
food and beverages
General Medicine
General Chemistry
biology.organism_classification
Pollution
Soil contamination
020801 environmental engineering
Biodegradation, Environmental
chemistry
Environmental chemistry
bacteria
Rhodococcus
Gammaproteobacteria
Subjects
Details
- ISSN :
- 18791298
- Volume :
- 248
- Database :
- OpenAIRE
- Journal :
- Chemosphere
- Accession number :
- edsair.doi.dedup.....32170e8a9e9f9d01ba7721f85c54082f