Visualisation of transient processes in biofilms by optical coherence tomography

Area of Science:

• Environmental Engineering
• Biotechnology
• Optical Engineering

Background:

• Biofilms impact water quality and system efficiency in natural and engineered water systems.
• Biofilms are crucial for pollutant removal in wastewater treatment but require monitoring for optimization.
• Current analytical techniques lack the online, non-invasive capabilities needed for effective biofilm management.

Purpose of the Study:

• To evaluate Optical Coherence Tomography (OCT) as a non-invasive technique for online biofilm monitoring.
• To demonstrate OCT's capability in visualizing biofilm structures and detachment processes.
• To assess OCT's potential for improving antifouling strategies and wastewater treatment plant optimization.

Main Methods:

• Utilized Optical Coherence Tomography (OCT), a non-invasive optical imaging technique.
• Applied OCT for real-time, spatially resolved monitoring of biofilm in a flow channel.
• Focused on assessing OCT's temporal resolution for transient process monitoring (seconds to minutes).

Main Results:

• Demonstrated OCT's ability to provide 3D imaging of biofilm structures without staining.
• Showcased OCT's capability to monitor biofilm growth and detachment processes in real-time.
• Confirmed OCT's high spatial resolution (around 10 micrometers) and temporal resolution.

Conclusions:

• OCT is a promising non-invasive tool for online monitoring of biofilm dynamics.
• The technique offers significant potential for optimizing wastewater treatment processes.
• OCT may become a standard method for assessing biofilm density and behavior in various applications.