Abstract
Purpose
This study was conducted to investigate the effect of biosurfactant and nutrient amendment on the bioremediation of heavy oily sludge. The biosurfactants exhibit characteristics of amphiphilicity, emulsifying activity, and biodegradability. The application of biosurfactant, appropriate water and nutrition, combined with mechanical stirring effectively enhanced bioremediation, providing a promising scheme for sustainable development of the ecosystem.
Methods
Here, biosurfactant was produced by strain Pseudomonas sp. CH1. Biosurfactant (80 mg L−1) was periodically added to heavy oily sludge for 10 weeks. The effects of biosurfactants on petroleum hydrocarbon content, catalase activity, and microbial community composition were characterized.
Results
Compared with the control (water addition only), treatment supplemented with biosurfactants exhibited better performance in degrading total petroleum hydrocarbons and n-alkanes, while regular cumulative addition of biosurfactants inhibited biodegradation. Moreover, the analysis of microbial community structure showed that the biosurfactant selectively enriched microorganisms that are capable of degrading petroleum hydrocarbons.
Conclusion
The results demonstrate the potential of biosurfactants for heavy oily sludge bioremediation. The application of biosurfactants can improve catalase activity and enrich the degrading populations, thereby promoting the biodegradation of total petroleum hydrocarbons, especially the aliphatic fractions, whereas high biosurfactant content inhibited the biodegradation.
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Data availability
The datasets used or analyzed during the current study are available from the corresponding author on reasonable request.
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Funding
This work was financially supported by the National Natural Science Foundation of China (No: 5270050), by the Fundamental Research Funds for the Central Universities (2020QNA4045), by the Research Funds of the Guangxi Key Laboratory of Theory and technology for Environmental Pollution Control (2001K004), and by the Major Science and Technology Project of Zhejiang Province (2021C02024).
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All authors contributed to the study conception and design. Data collection and analysis were performed by Hanghai Zhou, Shichen Li, and Lijia Jiang. Material preparation was performed by Feng Zeng, Xiaoyun Lin, and Chunlei Chen. The first draft of the manuscript was written by Hanghai Zhou and Shichen Li. The review of the manuscript was performed by Yanhong Li and Chunfang Zhang, and all authors commented on previous versions of the manuscript. All authors read and approved the final manuscript.
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Highlights
∙ Biosurfactant amendment notably promoted the TPH degradation in heavy oily sludge.
∙ The dose of biosurfactant had great influence on the degradation efficiency.
∙ Catalase activity increased with the degradation of petroleum hydrocarbons.
∙ Biosurfactant amendment selectively enriched the potential degrading populations.
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Zhou, H., Li, S., Jiang, L. et al. Effects of regular addition and discontinuation of biosurfactant on hydrocarbon biodegradation and microorganisms in heavy oily sludge. J Soils Sediments 22, 2475–2484 (2022). https://doi.org/10.1007/s11368-022-03239-3
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DOI: https://doi.org/10.1007/s11368-022-03239-3