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Quantifying Yeast Chronological Life Span by Outgrowth of Aged Cells
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Differentiating fouling from ageing for a condition-based diffuser maintenance.

Oscar Samuelsson1, Simon Bengtsson2

  • 1IVL Swedish Environmental Research Institute, Valhallavägen 81, Stockholm, 114 28, Sweden.

Water Research
|October 11, 2024
PubMed
Summary
This summary is machine-generated.

Effective diffuser maintenance requires separating fouling and ageing effects. Fouling increases pressure, while ageing surprisingly reduces it, with ageing causing significant oxygen transfer efficiency loss.

Keywords:
Acid cleaningAerationEnergy efficientScalingWastewater

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Area of Science:

  • Environmental Engineering
  • Wastewater Treatment Technologies
  • Aeration Systems

Background:

  • Diffuser maintenance is crucial for energy-efficient aeration in water resource recovery facilities (WRRFs).
  • Previous studies often combined fouling and ageing effects, hindering targeted maintenance strategies.
  • Distinguishing between fouling (cleaning) and ageing (replacement) is essential for optimizing diffuser performance.

Purpose of the Study:

  • To separately analyze the impact of fouling and ageing on diffuser performance (SOTE and DWP).
  • To quantify the performance loss attributable to fouling versus ageing in operational diffusers.
  • To provide insights for improved maintenance strategies in WRRFs.

Main Methods:

  • Analyzed six diffusers with 1.5 to 15 years of operational history from various WRRFs.
  • Developed an elaborate cleaning procedure to isolate fouling effects from ageing.
  • Measured changes in standard oxygen transfer efficiency (SOTE) and dynamic wet pressure (DWP) before and after cleaning, and compared with new membranes.

Main Results:

  • Fouling increased dynamic wet pressure (DWP) by up to 40 mbar, consistent with prior research.
  • Ageing unexpectedly reduced DWP by 5-10 mbar.
  • Standard oxygen transfer efficiency (SOTE) loss due to combined effects reached 28%; fouling accounted for <12% loss, while ageing contributed up to 25% loss.

Conclusions:

  • Ageing significantly impacts diffuser membranes, causing substantial SOTE loss, a finding not previously documented.
  • Effective WRRF maintenance requires monitoring both fouling and ageing independently.
  • Further research is needed to understand the mechanisms of ageing in diffuser membranes.