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Related Concept Videos

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In aerobic fermentations, oxygen is vital for microbial growth and metabolite production. Since air comprises only about 20% oxygen and the gas is poorly soluble in water—just 9 ppm at 20°C—supplying sufficient oxygen becomes a critical challenge, especially in high-demand processes like yeast growth or citric acid production. Even a fully saturated broth may offer only a few seconds of oxygen availability.To address this, sterile or scrubbed air is introduced into the fermentor via a sparger...
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Creating Rapid Oxygen Oscillations in Microbial Single-cell Growth Analysis using a Microfluidic Double-layer Device
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Fine-pore aeration diffusers: accelerated membrane ageing studies.

An Kaliman1, Diego Rosso, Shao-Yuan Leu

  • 1Songco Widya Engineering, R.E. Martadinata 12E, Jakarta 14430, Indonesia.

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|August 21, 2007
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Summary

Membrane diffusers in wastewater treatment degrade over time, impacting performance. Orifice creep is a superior indicator of membrane deterioration compared to hardness or Young

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Area of Science:

  • Environmental Engineering
  • Materials Science

Background:

  • Polymeric membranes are crucial for aeration in biological wastewater treatment.
  • Membrane degradation leads to reduced performance, increased headloss, and higher energy consumption.
  • Fouling and scaling accelerate membrane deterioration.

Purpose of the Study:

  • To evaluate mechanical properties for characterizing polymeric membrane performance over time.
  • To identify the most reliable parameter for predicting membrane diffuser failure.
  • To compare lab-scale aging simulations with full-scale plant data.

Main Methods:

  • Collected and tested used diffusers from municipal wastewater treatment plants for efficiency and headloss.
  • Dissected diffusers to measure mechanical properties: hardness, Young's modulus, and orifice creep.
  • Conducted lab-scale aging simulations on polyurethane and EPDM membranes under chemical stress.

Main Results:

  • A strong correlation was observed between membrane fouling and increased orifice creep.
  • Lab-scale aging confirmed full-scale plant observations.
  • Orifice creep proved more effective than Young's modulus and hardness in predicting diffuser deterioration.

Conclusions:

  • Orifice creep is a superior mechanical property for assessing polymeric membrane diffuser health in wastewater treatment.
  • Understanding membrane degradation mechanisms can optimize aeration system design and maintenance.
  • Predictive maintenance based on orifice creep can prevent performance decline and reduce operational costs.