Effects of the surface biofilms of heterogeneous Fenton catalyst on the bisphenol A removal and the characterization of its bacterial community
ZHANG Zeyu1,, LU Zhili1, ZHANG Yao2, SHI Baoyou2,3, ZHANG Lili2,3, XU Shuo2, HU Chun4, WANG Haibo2,3,, 1.Institute of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China 2.Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3.University of Chinese Academy of Sciences, Beijing 100049, China 4.Institute of Environmental Research, Guangzhou University, Guangzhou 510006, China
Abstract:In order to investigate the biofilms communities on the surface of heterogeneous Fenton catalyst after long-time running and their effects on the removal of bisphenol A, the heterogeneous Fenton was studied in a pilot scale to test its effect on the removal of natural organic matter (NOM) for 200 d. The effects of biofilms and the biofilms at different places of catalyst column on the removal of bisphenol A were also studied using a bench scale test. Meanwhile, different catalyst samples at the different places of the catalyst column were collected, and the biofilms bacterial community structure, bacterial biomass, bacterial metabolism, and the composition of extracellular polymeric substances (EPS) on the sample surface were analyzed. The results showed that heterogeneous Fenton had a good performance on the removal of NOM, and the formed biofilms improved the removal rate of bisphenol A to 36%~39%. Moreover, the results also indicated that the biofilms showed great similarity, especially for the biofilms in the middle and lower layers. The bacterial genera in upper layers were dominated by Herminiimonas and Bardyrhizobium, while in middle and lower layers, the bacterial genera were dominated by Reyranella Hyphomicrobium. Along with the changes of bacterial community, the biomass increased in the biofilms of catalyst from top to bottom. The function of bacterial metabolism also increased, and the bacteria could produce more EPS. This may be the main reason for the more removal of bisphenol A by biofilms adsorption, especially for the biofilms in the lower layers. The results indicated that the heterogeneous Fenton was a practical technique with promising applications for removing micropollutants. Key words:heterogeneous Fenton catalyst/ natural organic matter/ bisphenol A/ biofilms/ extracellular polymeric substances.
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1.Institute of Environmental and Municipal Engineering, North China University of Water Resources and Electric Power, Zhengzhou 450045, China 2.Key Laboratory of Drinking Water Science and Technology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing 100085, China 3.University of Chinese Academy of Sciences, Beijing 100049, China 4.Institute of Environmental Research, Guangzhou University, Guangzhou 510006, China Received Date: 2020-02-18 Accepted Date: 2020-05-19 Available Online: 2020-12-08 Keywords:heterogeneous Fenton catalyst/ natural organic matter/ bisphenol A/ biofilms/ extracellular polymeric substances Abstract:In order to investigate the biofilms communities on the surface of heterogeneous Fenton catalyst after long-time running and their effects on the removal of bisphenol A, the heterogeneous Fenton was studied in a pilot scale to test its effect on the removal of natural organic matter (NOM) for 200 d. The effects of biofilms and the biofilms at different places of catalyst column on the removal of bisphenol A were also studied using a bench scale test. Meanwhile, different catalyst samples at the different places of the catalyst column were collected, and the biofilms bacterial community structure, bacterial biomass, bacterial metabolism, and the composition of extracellular polymeric substances (EPS) on the sample surface were analyzed. The results showed that heterogeneous Fenton had a good performance on the removal of NOM, and the formed biofilms improved the removal rate of bisphenol A to 36%~39%. Moreover, the results also indicated that the biofilms showed great similarity, especially for the biofilms in the middle and lower layers. The bacterial genera in upper layers were dominated by Herminiimonas and Bardyrhizobium, while in middle and lower layers, the bacterial genera were dominated by Reyranella Hyphomicrobium. Along with the changes of bacterial community, the biomass increased in the biofilms of catalyst from top to bottom. The function of bacterial metabolism also increased, and the bacteria could produce more EPS. This may be the main reason for the more removal of bisphenol A by biofilms adsorption, especially for the biofilms in the lower layers. The results indicated that the heterogeneous Fenton was a practical technique with promising applications for removing micropollutants.
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