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Shift of propionate-oxidizing bacteria with HRT decrease in an UASB reactor containing propionate as a sole carbon

Qiaoying Ban1, Liguo Zhang, Jianzheng Li

  • 1State Key Laboratory of Urban Water Resource and Environment, School of Municipal and Environmental Engineering, Harbin Institute of Technology, Harbin, 150090, People's Republic of China, banqiaoying@163.com.

Applied Biochemistry and Biotechnology
|September 29, 2014
PubMed
Summary
This summary is machine-generated.

Shortening hydraulic retention time (HRT) in anaerobic reactors significantly shifts dominant propionate-oxidizing bacteria populations. Pelotomaculum schinkii initially dominated, but Smithella propionica became dominant at lower HRTs, impacting reactor stability.

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Area of Science:

  • Anaerobic digestion
  • Microbial ecology
  • Wastewater treatment

Background:

  • Propionate degradation is vital for anaerobic reactor efficiency.
  • Limited data exists on ecological factors affecting propionate-oxidizing bacteria.

Purpose of the Study:

  • Investigate microbial community shifts in propionate-oxidizing bacteria.
  • Analyze the impact of decreasing hydraulic retention time (HRT) in an upflow anaerobic sludge blanket (UASB) reactor.

Main Methods:

  • Operated a UASB reactor with propionate as the sole carbon source.
  • Decreased HRT stepwise from 10 h to 4 h.
  • Performed microbial community composition and quantitative analysis of key bacteria.

Main Results:

  • Syntrophobacter, Pelotomaculum, and Smithella were identified as major propionate-oxidizing bacteria.
  • Pelotomaculum schinkii dominated at 10 h HRT (56.2%).
  • Smithella propionica became dominant at 4 h HRT, with shifts in other genera at intermediate HRTs.

Conclusions:

  • HRT is a critical factor influencing propionate-oxidizing bacterial community structure.
  • Understanding these shifts is essential for optimizing anaerobic reactor performance and stability.
  • Smithella propionica's dominance at low HRT warrants further investigation for reactor management.