Effect of magnetic microparticles and nanoparticles on the performance of membrane bioreactor
ZHANG Wangchao1,2,, GUO Hongcheng2, GUO Jifeng1, LI Jixiang2,3,, 1.Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, School of Environmental Science and Engineering, Chang'an University, Xi'an 710064, China 2.Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China 3.University of Chinese Academy of Sciences, Beijing 100049, China
Abstract:In order to alleviate the problem of membrane fouling in membrane bioreactor (MBR), three MBRs were built to investigate the effects of magnetic microparticles and nanoparticles on their performance, including the pollutants removal, properties of sludge mixed liquor and membrane fouling. High-throughput sequencing was used to deeply analyze the relation between the succession of microbial community and MBR performance. Results showed that the addition of magnetic microparticles or nanoparticles had no adverse impact on pollutants removal in MBRs. The effluent COD and $ {\rm{NH}}_{\rm{4}}^{\rm{ + }}$-N were lower than 50 mg·L?1 and 5 mg·L?1, respectively, which could meet the first-class A standard of Chinese sewage discharge standard (GB 18918-2002). The addition of microparticles or nanoparticles can effectively alleviate membrane pollution, and the alleviation effect of magnetic microparticles was more significant. Analysis of membrane fouling components showed that the additions of magnetic materials with different sizes could effectively reduce the concentrations of SMP and LB-EPS components, and effectively reduce the content of macromolecules, but increase the content of small molecules, thereby the membrane fouling rate decreased. Microbial community analysis showed that the addition of microparticles or nanoparticles may inhibit the growth of pioneer species of Alphaproteobacteria indcuing membrane fouling, and the membrane fouling was effectively alleviated. Moreover, the magnetic microparticles also presented the better performance than nanoparticles. This study is expected to provide reference for engineering practice of regulating membrane fouling of MBR with magnetic activated sludge process. Key words:membrane fouling/ magnetic materials/ magnetic activated sludge/ pioneer species.
图1MBR实验装置示意图 Figure1.Schematic diagram of MBR system
图7污泥样品微生物群落结构在门和纲分类学水平上的系统分析(以相对丰度≥1%计) Figure7.Systematic analysis of the microbial community structure at phylum and class taxonomic levels for each bulk sludge sample (presented as ≥1% of the sequence reads in at least one sample)
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1.Key Laboratory of Subsurface Hydrology and Ecology in Arid Areas, Ministry of Education, School of Environmental Science and Engineering, Chang'an University, Xi'an 710064, China 2.Shanghai Advanced Research Institute, Chinese Academy of Sciences, Shanghai 201210, China 3.University of Chinese Academy of Sciences, Beijing 100049, China Received Date: 2019-10-28 Accepted Date: 2020-03-01 Available Online: 2020-10-14 Keywords:membrane fouling/ magnetic materials/ magnetic activated sludge/ pioneer species Abstract:In order to alleviate the problem of membrane fouling in membrane bioreactor (MBR), three MBRs were built to investigate the effects of magnetic microparticles and nanoparticles on their performance, including the pollutants removal, properties of sludge mixed liquor and membrane fouling. High-throughput sequencing was used to deeply analyze the relation between the succession of microbial community and MBR performance. Results showed that the addition of magnetic microparticles or nanoparticles had no adverse impact on pollutants removal in MBRs. The effluent COD and $ {\rm{NH}}_{\rm{4}}^{\rm{ + }}$-N were lower than 50 mg·L?1 and 5 mg·L?1, respectively, which could meet the first-class A standard of Chinese sewage discharge standard (GB 18918-2002). The addition of microparticles or nanoparticles can effectively alleviate membrane pollution, and the alleviation effect of magnetic microparticles was more significant. Analysis of membrane fouling components showed that the additions of magnetic materials with different sizes could effectively reduce the concentrations of SMP and LB-EPS components, and effectively reduce the content of macromolecules, but increase the content of small molecules, thereby the membrane fouling rate decreased. Microbial community analysis showed that the addition of microparticles or nanoparticles may inhibit the growth of pioneer species of Alphaproteobacteria indcuing membrane fouling, and the membrane fouling was effectively alleviated. Moreover, the magnetic microparticles also presented the better performance than nanoparticles. This study is expected to provide reference for engineering practice of regulating membrane fouling of MBR with magnetic activated sludge process.
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