Strains of internal biofilm in aerobic granular membrane bioreactors
Journal
Applied Microbiology and Biotechnology
Journal Volume
86
Journal Issue
6
Pages
1987-1993
Date Issued
2010
Author(s)
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. ? 2010 Springer-Verlag.
Subjects
Arthrobacter
Internal biofilm
Membrane bioreactor
Strains
Type
journal article