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Related Experiment Videos

Polyphosphate buffering by biomass with different phosphorus contents.

Willie F Harper1, Olange Anise, Eric Brown

  • 1238 Harbert Engineering Center, Auburn University, Auburn, AL 36849, USA. harpewf@auburn.edu

Water Research
|April 18, 2006
PubMed
Summary

Polyphosphate buffering enhances biological phosphorus removal in wastewater. However, high phosphorus content in biomass can increase effluent phosphorus levels, limiting its effectiveness, especially in membrane bioreactors.

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Area of Science:

  • Environmental Microbiology
  • Water Treatment Technologies
  • Biochemical Engineering

Background:

  • Enhanced biological phosphorus removal (EBPR) is crucial for managing phosphorus in wastewater.
  • Polyphosphate buffering presents a novel EBPR strategy for phosphorus-deficient wastewaters with variable organic loads.
  • Understanding the impact of biomass phosphorus content is key to optimizing this process.

Purpose of the Study:

  • To investigate the effect of biomass phosphorus content on polyphosphate buffering capacity.
  • To compare the performance of a membrane bioreactor (MBR) and a conventional bioreactor (CBR) in polyphosphate buffering.
  • To determine optimal biomass phosphorus levels for effective phosphorus removal and COD degradation.

Main Methods:

  • Utilized a membrane bioreactor (MBR) and a conventional bioreactor (CBR) for comparative analysis.

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  • Manipulated and monitored biomass phosphorus content (as % P/TSS).
  • Assessed polyphosphate buffering, chemical oxygen demand (COD) removal, and effluent total suspended solids (TSS) and phosphorus levels.

    • Main Results:

    • Increasing biomass phosphorus content enhanced polyphosphate buffering and COD removal up to a point.
    • At high biomass phosphorus content (20% P/TSS), effluent phosphorus levels increased in both MBR and CBR.
    • MBR demonstrated superior performance in reducing effluent TSS and phosphorus at low to medium biomass P content compared to CBR.

    Conclusions:

    • Polyphosphate buffering effectiveness is dependent on biomass phosphorus content, with diminishing returns at high levels.
    • While MBR offers advantages in TSS and effluent P reduction at lower P content, it does not enable polyphosphate buffering at high P content.
    • Careful management of biomass phosphorus content is essential for successful implementation of polyphosphate buffering in wastewater treatment.