DOI QR코드

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Syntrophic Propionate Degradation Response to Temperature Decrease and Microbial Community Shift in an UASB Reactor

  • Ban, Qiaoying (School of Municipal and Environmental Engineering, Harbin Institute of Technology) ;
  • Li, Jianzheng (School of Municipal and Environmental Engineering, Harbin Institute of Technology) ;
  • Zhang, Liguo (School of Municipal and Environmental Engineering, Harbin Institute of Technology) ;
  • Jha, Ajay Kumar (School of Municipal and Environmental Engineering, Harbin Institute of Technology) ;
  • Zhang, Yupeng (School of Municipal and Environmental Engineering, Harbin Institute of Technology) ;
  • Ai, Binling (School of Municipal and Environmental Engineering, Harbin Institute of Technology)
  • 투고 : 2012.10.05
  • 심사 : 2012.10.31
  • 발행 : 2013.03.28

초록

Propionate is an important intermediate product during the methane fermentation of organic matter, and its degradation is crucial for maintaining the performance of an anaerobic digester. In order to understand the effect of temperature on propionate degradation, an upflow anaerobic sludge blanket (UASB) reactor with synthetic wastewater containing propionate as a sole carbon source was introduced. Under the hydraulic retention time (HRT) of 10 h and influent propionate of 2,000 mg/l condition, propionate removal was above 94% at 30-$35^{\circ}C$, whereas propionate conversion was inhibited when temperature was suddenly decreased stepwise from $30^{\circ}C$ to $25^{\circ}C$, to $20^{\circ}C$, and then to $18^{\circ}C$. After a long-term operation, the propionate removal at $25^{\circ}C$ resumed to the value at 30- $35^{\circ}C$, whereas that at $20^{\circ}C$ and $18^{\circ}C$ was still lower than the value at $35^{\circ}C$ by 8.1% and 20.7%, respectively. Microbial community composition analysis showed that Syntrophobacter and Pelotomaculum were the major propionate-oxidizing bacteria (POB), and most POB had not changed with temperature decrease in the UASB. However, two POB were enriched at $18^{\circ}C$, indicating they were low temperature tolerant. Methanosaeta and Methanospirillum were the dominant methanogens in this UASB and remained constant during temperature decrease. Although the POB and methanogenic composition hardly changed with temperature decrease, the specific $COD_{Pro}$ removal rate of anaerobic sludge (SCRR) was reduced by 21.4%-46.4% compared with the control ($35^{\circ}C$) in this system.

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  1. Quantitative Analysis of Previously Identified Propionate-Oxidizing Bacteria and Methanogens at Different Temperatures in an UASB Reactor Containing Propionate as a Sole Carbon Source vol.171, pp.8, 2013, https://doi.org/10.1007/s12010-013-0465-y
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