Ceramic membrane defouling (cleaning) by air Nano Bubbles

Area of Science:

• Materials Science
• Chemical Engineering
• Environmental Science

Background:

• Ceramic membranes offer superior mechanical, chemical, and thermal resistance for filtration applications.
• Membrane fouling remains a significant challenge, limiting the large-scale implementation of ceramic membrane technology.
• Air Nano Bubbles (NBs) exhibit high mass transfer efficiency, suggesting potential for fouling mitigation.

Purpose of the Study:

• To investigate the efficacy of air Nano Bubbles (NBs) in preventing and cleaning fouled ceramic membranes.
• To assess the performance recovery of ceramic membranes treated with air NBs.

Main Methods:

• Ceramic membrane filtration experiments were conducted at bench and pilot scales.
• Humic acid was used to simulate organic fouling on the membrane surface.
• Air NBs were applied for both fouling resistance and membrane defouling (cleaning).
• Atomic Force Microscopy (AFM) was used to analyze membrane surface changes.

Main Results:

• Complete membrane clogging occurred within 6 hours using humic acid as a foulant.
• Air NBs effectively cleaned the ceramic membrane surface, as evidenced by AFM imaging.
• Permeate flux was fully recovered to its initial level after NB treatment, indicating successful pore unclogging.

Conclusions:

• Air Nano Bubbles demonstrate significant potential for preventing and removing fouling in ceramic membrane systems.
• The integrated ceramic membrane and air NBs system presents an innovative and sustainable solution for membrane filtration.
• This technology could enhance the longevity and efficiency of ceramic membranes in various industrial applications.