NDLI: Bioaugmentation and coexistence of two functionally similar bacterial strains in aerobic granules

Content Provider	Springer Nature Link
Author	Jiang, He Long Maszenan, Abdul Majid Tay, Joo Hwa
Copyright Year	2007
Abstract	The survival of the inoculated microbial culture is critical for successful bioaugmentation but impossible to predict precisely. As an alternative strategy, bioaugmentation of a group of microorganisms may improve reliability of bioaugmentation. This study evaluated simultaneous bioaugmentation of two functionally similar bacterial strains in aerobic granules. The two strains, Pandoraea sp. PG-01 and Rhodococcus erythropolis PG-03, showed high phenol degradation and growth rates in phenol medium, but they were characterized as having a poor aggregation activity and weak bioflocculant-producing and biofilm-forming abilities. In the spatially homogeneous batch conditions, strain PG-01 with higher growth rates outcompeted strain PG-03. However, the two strains could stably coexist in the spatially heterogeneous conditions. Then the two strains were mixed and bioaugmented into activated sludge in two sequencing batch reactors, which were operated with the different settling times of 5 and 30 min, respectively. Aerobic granules were developed only in the reactor with a settling time of 5 min. Fluorescence in situ hybridization and denaturing gradient gel electrophoresis showed that the two strains could coexist in aerobic granules but not in activated sludge. These findings suggested that the compact structure of aerobic granules provided spatial isolation for coexistence of competitively superior and inferior strains with similar functions.
Starting Page	1191
Ending Page	1200
Page Count	10
File Format	PDF
ISSN	01757598
Journal	Applied Microbiology and Biotechnology
Volume Number	75
Issue Number	5
e-ISSN	14320614
Language	English
Publisher	Springer-Verlag
Publisher Date	2007-03-17
Publisher Place	Berlin, Heidelberg
Access Restriction	Subscribed
Subject Keyword	Aerobic granules Bioaugmentation Coexistence Competition Phenol degradation Spatial effect Microbial Genetics and Genomics Microbiology Biotechnology
Content Type	Text
Resource Type	Article
Subject	Medicine Applied Microbiology and Biotechnology Biotechnology

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