Abstract
This study isolated strains in suspended liquor, the surface fouling layer, and biofilm inside hollow-fiber membranes of a membrane bioreactor (MBR); analyzed their distributions, sizes, surface charges, and growth behaviors; and determined the quantities of extracellular polymeric substances (EPS) secreted by these strains under different organic loadings. Three strains, which may penetrate the microfiltration membranes, were close relatives of the Ralstonia mannitolilytica strain SDV (GenBank Accession No. GU451066), Arthrobacter sp. BJQ-2 (GenBank Accession No. GU451067), and Actinobacterium DS3 (GenBank Accession No. GU451068). Among these three strains, only Arthrobacter sp. developed an internal biofilm. The relatively short length of Arthrobacter sp. minimizes resistance to cells moving through the membrane matrix, thereby enhancing its ability to build a biofilm in the interior surface of membranes.
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Acknowledgement
This project is partly supported by the State Key Laboratory of Urban Water Resource and Environment (SKLUWRE), Harbin Institute of Technology and by Project 50821002 (National Creative Research Groups) supported by National Nature Science Foundation of China.
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Juang, YC., Adav, S.S. & Lee, DJ. Strains of internal biofilm in aerobic granular membrane bioreactors. Appl Microbiol Biotechnol 86, 1987–1993 (2010). https://doi.org/10.1007/s00253-010-2527-1
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DOI: https://doi.org/10.1007/s00253-010-2527-1