Strategy to Promote the Biodegradation of Phenanthrene in Contaminated Soil by a Novel Bacterial Consortium in Slurry Bioreactors

Xuyang Jiang, Zhen Mao, Licun Zhong, Jinbiao Yu and Yan Tang
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Xuyang Jiang: School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Zhen Mao: School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Licun Zhong: School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Jinbiao Yu: School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China
Yan Tang: School of Environmental Science and Spatial Informatics, China University of Mining and Technology, Xuzhou 221116, China

IJERPH, 2022, vol. 19, issue 9, 1-15

Abstract: Polycyclic aromatic hydrocarbons (PAHs) are typical high-risk, persistent organic pollutants. Biological slurry reactors are widely used for enhanced bioremediation. In this experiment, a highly efficient phenanthrene-degrading bacteria group was obtained through screening and domestication, and the community was named MZJ_21. After the addition of MZJ_21 to the aerobic slurry bioreactor, with the optimum conditions of the temperature, stirring speed, and aeration rate of 30 °C, 120 rpm, and 1 L/min, respectively, the phenanthrene degradation ratio reached 95.41% within 48 h. The exploration of the degradation of phenanthrene by MZJ_21 indicated that most MZJ_21 communities adsorbed on the soil particle, mainly because MZI_21 could secrete extracellular polymers, which could stably adhere MZJ_21 on the solid phase. At the same time, the distribution ratio of phenanthrene in the solid phase is increased, so that the efficient phenanthrene degradation reaction takes place in the solid phase.

Keywords: microbial degradation; phenanthrene; extracellular polymeric substances; bioslurry (search for similar items in EconPapers)
JEL-codes: I I1 I3 Q Q5 (search for similar items in EconPapers)
Date: 2022
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