土壤微生物电化学系统降解四环素的机理

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Abstract A soil microbial electrochemical system (SMES) was constructed to study tetracycline degradation, and the samples were collected after 58 days of incubation under dark and constant temperature conditions. The relationships among tetracycline degradation, soil physicochemical properties, enzyme activity and three-domain microorganisms were analyzed to reveal the biodegradation mechanism of tetracycline in the SMES. The results showed that the degradation rate of tetracycline was significantly increased to 70% from 52% by using the SMES. Compared with the control treatment, the activity of dehydrogenase in the SMES increased by 144%, and it was significantly positively correlated with tetracycline degradation. In contrast, weak tetracycline degradation by polyphenol oxidase, catalase and laccase was observed in the SMES. As an important physicochemical factor affecting soil microbial community, soil pH value was negatively correlated with tetracycline degradation. Network analysis showed that fungi played a key role in the degradation of tetracycline, the genera of Geoalkalicharacter, Microascus, Wardomyces and Scopulariopsis were potential degrading microorganisms of tetracycline, among which Microascus and Scopulariopsis may secrete dehydrogenase to degrade tetracycline.

Key words： soil microbial electrochemical system tetracycline degrading microorganisms dehydrogenase

Received: 28 June 2020

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	ZHAO Xiao-dong
	LI Xiao-jing
	ZHAO Peng-yu
	SONG Min-li
	YAN Ping-mei
	REN Tian-zhi
	LI Yong-tao

Cite this article:

ZHAO Xiao-dong,LI Xiao-jing,ZHAO Peng-yu等. Mechanism of tetracycline degradation by soil microbial electrochemical systems[J]. CHINA ENVIRONMENTAL SCIENCECE, 2021, 41(2): 778-786.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2021/V41/I2/778

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