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Effect of pH control on EBPR stability and efficiency.

L S Serafim1, P C Lemos, M A M Reis

  • 1Chemistry Department, FCT/UNL, Caparica, Portugal.

Water Science and Technology : a Journal of the International Association on Water Pollution Research
|October 4, 2002
PubMed
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Biological phosphorus removal is key for eutrophication control. Uncontrolled pH in sequenced batch reactors (SBRs) enhanced phosphorus removal efficiency and stability compared to controlled pH conditions, suggesting different microbial populations developed.

Area of Science:

  • Environmental Science
  • Microbiology
  • Water Treatment Engineering

Background:

  • Biological phosphorus removal is crucial for mitigating eutrophication.
  • Understanding operational parameters, like pH, is vital for optimizing phosphorus removal efficiency.
  • The specific impact of pH control on the stability and efficiency of biological phosphorus removal in sequenced batch reactors (SBRs) requires further elucidation.

Purpose of the Study:

  • To investigate the influence of pH control on the performance of two SBRs for biological phosphorus removal.
  • To compare the efficiency and stability of an SBR operated with continuous pH control (pH 7.0) against one without pH control (pH fluctuating from 7.8 to 8.5).

Main Methods:

  • Two SBRs were utilized for biological phosphorus removal.

Related Experiment Videos

  • One reactor was maintained at a constant pH of 7.0 through control measures.
  • The second reactor was operated without pH control, allowing pH to fluctuate naturally between approximately 7.8 and 8.5.

    • Main Results:

    • The SBR operated without pH control exhibited superior phosphorus removal efficiency compared to the pH-controlled reactor.
    • The non-pH-controlled reactor also demonstrated greater operational stability.
    • Kinetic analysis suggested the development of distinct bacterial populations in each reactor.

    Conclusions:

    • pH control at 7.0 negatively impacted biological phosphorus removal efficiency and stability in SBRs.
    • Allowing natural pH fluctuations (7.8-8.5) promoted more effective phosphorus removal.
    • The observed differences indicate that pH significantly influences microbial community structure and function in biological phosphorus removal systems.