Journal
INTERNATIONAL JOURNAL OF ENVIRONMENTAL SCIENCE AND TECHNOLOGY
Volume 19, Issue 7, Pages 6023-6032Publisher
SPRINGER
DOI: 10.1007/s13762-021-03467-z
Keywords
Bioaugmentation; Bioremediation; Biostimulation; Gas station; TPH-contaminated soils
Categories
Funding
- Conselho Nacional de Desenvolvimento Cientifico e Tecnologico (CNPq)
- Coordenacao de Aperfeicoamento de Pessoal do Ensino Superior (CAPES)
- Bioplus Desenvolvimento Biotecnologico Ltda
- [302637/2017-6]
- [307191/2016-8]
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Comparison of different bioremediation methods showed that bioaugmentation with biostimulation was effective in degrading petroleum hydrocarbons, while natural attenuation and biostimulation treatments resulted in elevated contaminant levels. No correlation was observed between the presence of hydrocarbon-degrading microorganisms and CO2 production, and denaturing gradient gel electrophoresis showed no significant difference in biodiversity.
Bioremediation strategies apply environmental microbes to metabolize organic compounds and can be useful for the treatment of oil-contaminated soils. In this study, different approaches of bioremediation were compared on a scale-up treatment. The defined microbial consortium was formulated with degrading microorganisms previously selected (Pseudomonas mendoncina BPB 1.8, Bacillus cereus BPB 1.20, Bacillus cereus BPB 1.26, and Bacillus sphaericus BPB 1.35). Bioaugmentation/biostimulation, biostimulation, and natural attenuation strategies were evaluated after 60 days of treatment by gas chromatography. The contaminant level remained elevated after the treatments using natural attenuation and biostimulation. However, the bioaugmentation with biostimulation treatment showed a satisfactory ability to degrade petroleum hydrocarbons (85%). Interestingly, no correlation was observed with the presence of hydrocarbon-degrading microorganisms and CO2 production, and denaturing gradient gel electrophoresis exhibited no significant difference in the biodiversity of the treatments. Although, the results showed that the microbial consortium was imperative to the successful biodegradation of TPH-contaminated gas station soil.
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