1. Enhanced biodegradation of aged petroleum hydrocarbons in soils by glucose addition in microbial fuel cells
- Author
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Yueyong Zhang, Xin Wang, Xiaojing Li, Qixing Zhou, Lili Wan, Desheng Li, and Nan Li
- Subjects
Microbial fuel cell ,Environmental remediation ,General Chemical Engineering ,0211 other engineering and technologies ,02 engineering and technology ,010501 environmental sciences ,complex mixtures ,01 natural sciences ,Inorganic Chemistry ,chemistry.chemical_compound ,Waste Management and Disposal ,0105 earth and related environmental sciences ,021110 strategic, defence & security studies ,biology ,Renewable Energy, Sustainability and the Environment ,Chemistry ,Organic Chemistry ,Environmental engineering ,Soil classification ,Biodegradation ,biology.organism_classification ,Pollution ,Soil contamination ,Fuel Technology ,Environmental chemistry ,Soil water ,Total petroleum hydrocarbon ,Alcanivorax ,Biotechnology - Abstract
BACKGROUND: Bioelectrochemical remediation of soils contaminated by petroleum hydrocarbons has received increasing attention as an effective approach to remove pollution with simultaneous electricity generation. RESULTS: Here, glucose was added as a co-substrate in this system. The charge output of soil microbial fuel cells (MFCs) was enhanced by 262%, and the total petroleum hydrocarbon degradation rate increased by 200%. According to the increased dehydrogenase and polyphenol oxidase activities, the exogenetic glucose substantially activated hydrocarbon degradation bacteria (such as Alcanivorax). The Shannon–Wiener Index and richness of soil microbial community decreased after glucose addition, indicating that a selective enrichment of specific communities was imposed by glucose. Correlation analysis showed the biodiversity in soil far from the cathode was mainly determined by the concentration of petroleum hydrocarbons, while that in soil close to the cathode was dominated by the current. CONCLUSION: This study demonstrated that an exogenetic carbon source enhanced the bioelectrochemically assisted degradation of aged petroleum hydrocarbons in saline soils, providing an effective approach to remove contaminations from soil in barren areas or extreme environments. © 2015 Society of Chemical Industry Supporting information may be found in the online version of this article.
- Published
- 2015