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Side-stream enhanced biological phosphorus removal (S2EBPR) process improves system performance - A full-scale

Dongqi Wang1, Nicholas B Tooker2, Varun Srinivasan2

  • 1State Key Laboratory of Eco-hydraulics in Northwest Arid Region, Xi'an University of Technology, Xi'an, Shaanxi, 710048, China; Department of Civil and Environmental Engineering, Northeastern University, 360 Huntington Avenue, Boston, MA, 02115, United States.

Water Research
|October 5, 2019
PubMed
Summary
This summary is machine-generated.

A novel side-stream enhanced biological phosphorus removal (S2EBPR) process improves phosphorus removal and stability. This method promotes polyphosphate accumulating organisms (PAOs) over glycogen accumulating organisms (GAOs) for better wastewater treatment performance.

Keywords:
ActivityEBPRMicrobial ecologyPerformance comparisonSide-stream

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Area of Science:

  • Environmental Microbiology
  • Wastewater Treatment Engineering
  • Biotechnology

Background:

  • Enhanced biological phosphorus removal (EBPR) faces challenges with stability and carbon-to-phosphorus ratios.
  • A side-stream EBPR (S2EBPR) process, incorporating a side-stream anaerobic reactor, is proposed as an alternative.
  • Conventional anaerobic-anoxic-aerobic (A2O) processes have limitations in achieving optimal EBPR.

Purpose of the Study:

  • To compare the performance, microbial activity, and community structure of S2EBPR and conventional A2O processes.
  • To evaluate the effectiveness of S2EBPR in improving phosphorus removal and process stability.
  • To understand the microbial dynamics and metabolic pathways favoring PAOs in the S2EBPR configuration.

Main Methods:

  • Full-scale pilot testing comparing side-by-side A2O and S2EBPR configurations.
  • Mass balance analysis to quantify denitrification and EBPR contributions.
  • Microbial community analysis, including PAO and GAO abundance and diversity.
  • Assessment of PAO activity and metabolic pathway utilization.

Main Results:

  • S2EBPR demonstrated superior P removal performance and stability compared to A2O, especially with intermittent mixing.
  • Both denitrification and EBPR were enhanced in S2EBPR due to strategic sludge and influent diversion.
  • Higher PAO activity and abundance were observed in S2EBPR, with a greater reliance on glycolysis.
  • S2EBPR showed increased microbial diversity and a lower abundance of GAOs, indicating a competitive advantage for PAOs.

Conclusions:

  • The S2EBPR configuration offers significant advantages for enhanced biological phosphorus removal, improving stability and efficiency.
  • Extended anaerobic retention and controlled volatile fatty acid production in S2EBPR favor PAOs over GAOs.
  • S2EBPR promotes sustained PAO activity and resilience, providing valuable insights for advanced wastewater treatment strategies.