氧化还原过程对好氧微生物产物光敏性的影响

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Abstract In this study, the microorganisms in aerobic activated sludge (Ae) and pure microbial Escherichia coli (E) were used as the main sources of soluble microbial products (SMP) to investigate the influence of photochemical and electric potential redox processes on the changes in functional groups, components and photochemical activity of SMP. The results showed that the SUVA₂₅₄ and E2/E3 of Ae and E were 4.03/0.79 and 1.60/3.04, respectively, indicating that Ae has the higher molecular weight and aromaticity than E. Besides, illumination and electrochemistry significantly decreased the fluorescence intensity and changed the aromaticity and humification degree of SMP. And these two processes can increase the concentration of active oxidation species (³SMP^*, ¹O₂ and ^·OH) of SMP under illumination conditions. The [¹O₂]_ss and [·OH]_ss increased from 1.70mol/L and 3.57mol/L to 18.47mol/L and 438.25mol/L, respectively. In addition, the photodegradation kinetic of 17α-ethinylestradiol (EE2) mediated by SMP improved by almost 5 folds after being modified. This study improved the scientific understanding of the natural transformation processes of SMP in wastewater treatment plant effluent and the natural photodegradation of trace pollutants mediated by SMP.

Key words： soluble microbial products oxidation and reduction 17α-ethinylestradiol photodegradation

Received: 14 June 2022

PACS:

X703

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	Articles by authors
	LAI Chao-chao
	YU Guo-xi
	LIAO Zhi-cheng
	GUO Zi-wei
	HE Huan
	HUANG Bin
	PAN Xue-jun

Cite this article:

LAI Chao-chao,YU Guo-xi,LIAO Zhi-cheng等. Effect on photosensitization activities of soluble microbial products by redox processes[J]. CHINA ENVIRONMENTAL SCIENCECE, 2023, 43(1): 206-216.

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http://www.zghjkx.com.cn/EN/ OR http://www.zghjkx.com.cn/EN/Y2023/V43/I1/206

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