A Microfluidic Platform to Study Bioclogging in Porous Media.

Area of Science:

• Environmental microbiology
• Fluid dynamics
• Porous media science

Background:

• Bacterial biofilms form in environmental and industrial porous media like soils and membranes.
• Biofilm growth under flow conditions can lead to pore clogging, termed bioclogging.
• Bioclogging significantly alters porous medium permeability, causing pressure buildup and affecting mass flow.

Purpose of the Study:

• To investigate the interplay between biofilm growth and fluid flow under controlled physical conditions.
• To develop a microfluidic platform for visualizing and quantifying biofilm development and its effects.
• To establish a systematic approach for studying bioclogging in porous media.

Main Methods:

• Development of a microfluidic platform for controlled experiments.
• Microscopic visualization of biofilm development.
• Simultaneous measurement of biofilm-induced pressure buildup using pressure sensors.
• Correlation of pressure buildup with biofilm surface coverage.

Main Results:

• The microfluidic platform successfully visualized biofilm development under controlled flow velocities and pore sizes.
• Quantified the relationship between biofilm growth and pressure buildup.
• Demonstrated the impact of bioclogging on local permeability and mass flow.

Conclusions:

• The developed microfluidic platform serves as a baseline for systematic investigation of bioclogging.
• The study provides a method to understand biofilm effects on fluid flow in porous media.
• The platform can be adapted for studying diverse environmental and multispecies biofilms.