Journal
BIORESOURCE TECHNOLOGY
Volume 101, Issue 1, Pages 98-104Publisher
ELSEVIER SCI LTD
DOI: 10.1016/j.biortech.2009.07.085
Keywords
Enhanced biological phosphorus removal (EBPR); Carbon source; Polyphosphorus accumulating organisms (PAOs); Glycogen accumulating organism (GAOs); Plug-flow A/O process
Funding
- National Natural Science Foundation of China (NSFC) [50608064, 50628808]
- Excellent Doctoral Dissertation Nationwide Foundation [200756]
- Programs for New Century Excellent Talents in University [NCET-08-0404]
- Yong Scientific and Technical Talents in Shanghai [09QA1406100]
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Laboratory experiments were conducted in a continuous plug-flow anaerobic/aerobic (A/O) process to kinetically investigate the long-term effect of the different carbon sources (i.e., acetate, acetate/propionate, propionate and glucose) on the competition between polyphosphorus accumulating organisms (PAOs) and glycogen accumulating organisms (GAOs). It was found that propionate was more benefit than acetate for PAOs even in the A/O process, and PAOs enriched with acetate were readily able to metabolize propionate without the requirement of adaptation. Glucose gave GAOs metabolic advantage in the PAOs-GAOs competition, which thereby worsened the EBPR performance. Nevertheless, the EBPR capacity could recover by returning carbon to acetate, with the acclimation time of approximately 2-SRTs. This suggests that the varying of carbon can be an effective approach to provide PAOs a competitive advantage over GAOs. Additionally, MLVSS/MLSS could indicate the shift of the microorganism between GAOs and PAOs, but it was not as precise as the biomass-P content. (C) 2009 Elsevier Ltd. All rights reserved.
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