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Related Concept Videos

Detergent Purification of Membrane Proteins01:18

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Detergents are used to purify the integral proteins of the membrane. The hydrophobic portion of the detergent can replace membrane phospholipids while solubilizing the membrane proteins. When detergent monomers reach a specific concentration in a solution called critical micelle concentration (CMC), they form micelles. Above CMC, the concentration of the detergent monomers remains in equilibrium with the micelle. The number of detergent monomers present in the CMC varies for each detergent, and...
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Imaging and Quantification of the Area of Fast-Moving Microbubbles Using a High-Speed Camera and Image Analysis
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Membrane cleaning with ultrasonically driven bubbles.

Fabian Reuter1, Sonja Lauterborn2, Robert Mettin1

  • 1Drittes Physikalisches Institut, Georg-August-Universität Göttingen, Friedrich-Hund-Platz 1, 37077 Göttingen, Germany.

Ultrasonics Sonochemistry
|April 22, 2017
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Summary
This summary is machine-generated.

High-frequency ultrasound (130kHz) effectively cleans fouled ultrafiltration membranes for drinking water treatment. This mechanical cleaning method preserves membrane integrity and water quality without damage.

Keywords:
Acoustic-bubble cleaning mechanismFiltrationUltrasonic cavitationUltrasonic cleaningWater treatment

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Area of Science:

  • Environmental Engineering
  • Materials Science
  • Acoustics

Background:

  • Polymeric membranes are crucial for drinking water treatment but prone to fouling.
  • In situ cleaning methods are needed to maintain membrane performance and longevity.
  • Ultrasound application is explored as a non-chemical cleaning technique.

Purpose of the Study:

  • To investigate the effectiveness of ultrasound in mechanically cleaning fouled ultrafiltration membranes.
  • To determine optimal ultrasound frequencies and power for membrane cleaning.
  • To understand the cleaning mechanisms and their impact on membrane integrity and permeate quality.

Main Methods:

  • Construction of a laboratory filtration plant with ultrafiltration membrane modules.
  • Application of ultrasound at 35kHz and 130kHz frequencies during a cleaning cycle including backwashing and air flushing.
  • High-resolution acoustic and optical measurements, including high-speed imaging of bubble dynamics.
  • Microscopic inspection of membrane surfaces post-cleaning.
  • On-line monitoring of membrane integrity and permeate quality (particle counting, turbidity).

Main Results:

  • Ultrasound at 130kHz demonstrated effective cleaning of fouled membranes, unlike 35kHz.
  • Optimal cleaning effectiveness was achieved at moderate ultrasound driving powers.
  • Acoustic and optical analyses revealed cleaning mechanisms linked to bubble behavior at the membrane surface.
  • Microscopic inspection showed distinct cleaning patterns related to bubble activity.
  • No membrane damage or irreversible permeability loss was detected.

Conclusions:

  • 130kHz ultrasound is a viable method for in situ mechanical cleaning of fouled ultrafiltration membranes.
  • The cleaning mechanism involves specific bubble dynamics generated by ultrasound.
  • This ultrasound-assisted cleaning preserves membrane integrity and ensures high-quality permeate for drinking water treatment.