Effect of COD/N and COD/P ratios on the PHA transformation and dynamics of microbial community structure in a denitrifying phosphorus removal process. Issue 7 (23rd November 2012)

• Record Type: Journal Article
• Authors: Wang, Yayi; Geng, Junjun; Ren, Zhongjia; Guo, Gang; Wang, Chong; Wang, Hong
• Is Part Of: Journal of chemical technology & biotechnology. Volume 88:Issue 7(2013:Jul.)
• Page Start: 1228
• Page End: 1236
• Publication Date: 2012-11-23
• Subjects: Biotechnology -- Periodicals; Chemistry, Technical -- Periodicals; Chemical engineering -- Periodicals; Industries -- Environmental aspects -- Periodicals; 660
• DOI: 10.1002/jctb.3962
• Languages: English
• ISSNs: 0268-2575

Abstract

<abstract abstract-type="main"> <title>Abstract</title> <sec id="jctb3962-sec-0001" sec-type="section"> <title>Background</title> <p> <bold>A lab‐scale anaerobic‐anoxic/nitrification (A<sub>2</sub>N) two‐sludge sequencing batch reactor (SBR) system was operated to assess the relationship among intracellular polymer conversions, bacterial population dynamics and nutrient removal performance in response to the varying influent COD/N/P</bold>.</p> </sec> <sec id="jctb3962-sec-0002" sec-type="section"> <title>Results</title> <p> <bold>Complete nutrient removal was achieved in the A<sub>2</sub>N‐SBR in Run 3 where the COD/P and COD/N were 20.6 and 6.9, respectively. This coincides well with the highest P release/HAc uptake ratio occurring in Run 3, confirming high abundance of denitrifying phosphorus accumulating organisms (DPAOs) in the biomass. Under the stress of N or P limitation, more poly‐β‐hydroxyalkanoates (PHA) was synthesized, with the increasing proportion of poly‐hydroxyvalerate (PHV) in PHA. The population biodiversity decreased with increasing carbon loading when P loads were maintained at constant levels, and recovered to the initial level after P loading decreased</bold>.</p> </sec> <sec id="jctb3962-sec-0003" sec-type="section"> <title>Conclusions</title> <p> <bold>Increasing COD/P promoted anaerobically synthesized PHA amount and favored P removal. Also, PHB seems to be the crucial internal carbon source relating to P release and uptake, whereas high nitrogen and P removal efficiencies always relate to a high proportion of PHV in PHA. Increasing carbon loading led to a decreased biodiversity of the community structure but favored higher PAO enrichments, if only P loading is not limited.© 2012 Society of Chemical Industry</bold> </p> </sec> </abstract>