Biological nitrogen and phosphorus removal and changes in microbial community structure in a membrane bioreactor: Effect of different carbon sources
Bacterial community structures in four sequencing anoxic/anaerobic–aerobic membrane bioreactors (SAMs) that were fed with synthetic medium composed of different organic compounds in substrate as carbon source; acetate-dominant (acetate/propionate=4/1), propionate-dominant (acetate/propionate=1/4), g...
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Veröffentlicht in: | Water research (Oxford) 2008, Vol.42 (1), p.198-210 |
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Zusammenfassung: | Bacterial community structures in four sequencing anoxic/anaerobic–aerobic membrane bioreactors (SAMs) that were fed with synthetic medium composed of different organic compounds in substrate as carbon source; acetate-dominant (acetate/propionate=4/1), propionate-dominant (acetate/propionate=1/4), glucose-dominant (glucose/acetate=4/1) and methanol-dominant (methanol/acetate/propionate=6/3/1) were analyzed by respiratory quinone profile and fluorescent in situ hybridization (FISH) techniques. The SAMs were operated at controlled pH range 7–8.5 and at constant temperature 25
°C. Total nitrogen (TN), total phosphorus (TP) and COD removal performances were also evaluated and compared. In addition, trans-membrane pressure was monitored to observe the impact of substrate composition on membrane fouling. The dominance of the mole fraction of ubiquinone (UQ-8) in the SAMs indicated dominance of the
β-subclass of
Proteobacteria; however, its population comparatively decreased when the substrate was glucose dominant or methanol dominant. A relatively higher and stable enhanced biological phosphorus removal performance was observed when methanol-dominant substrate was used concurrently with an increase in the
γ-subclass of
Proteobacteria. The population of the
α-subclass of
Proteobacteria slightly increased along with a decrease in phosphate removal activity when the substrate was glucose-dominant. Results from FISH analysis also supported the findings of the quinone profile. The trans-membrane pressure variation in the SAMs indicated that fouling was relatively rapid when propionate-dominant or methanol-dominant substrate was used and most stable when glucose-dominant substrate was used. A combination of methanol and acetate would be a better choice as an external carbon source when nutrients removals, as well as fouling, are considered in the membrane bioreactor- (MBR-) coupled biological nutrients removing (BNR) process. |
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ISSN: | 0043-1354 1879-2448 |
DOI: | 10.1016/j.watres.2007.06.062 |