Wavelength-Specific Biofilm Control from Internally UV-Emitting Glass Surfaces

Area of Science:

• Materials Science
• Microbiology
• Environmental Engineering

Background:

• Microbial biofilms on wetted surfaces present significant operational and health challenges.
• Traditional antifouling coatings often require consumables and can have environmental drawbacks.
• UV-emitting glass (UEG) presents a novel, consumable-free approach to biofilm control.

Purpose of the Study:

• To introduce and evaluate a wavelength-specific UV-emitting glass (UEG) for biofilm inhibition.
• To compare the efficacy of different UV wavelengths emitted by UEG in reducing biofilms.
• To assess the energy efficiency of UEG technology compared to other electrically driven methods.

Main Methods:

• UEGs were utilized to provide bottom-up UV irradiance, enhancing oxidative and photolytic inhibition.
• Biofilm inhibition was quantified using log reduction values (LRV) and visual assessment.
• Electrical power consumption was calculated for comparative analysis with existing technologies.

Main Results:

• The 265 nm UEG achieved the highest performance, with >3 LRV and >95% visible biofilm reduction.
• Other wavelengths (365 nm and 310 nm) showed lower LRV but still contributed to biofilm inhibition.
• Biofilm thickness remained consistent across different UEG wavelengths, indicating inhibition of surface colonization.

Conclusions:

• Wavelength-specific UV irradiance from UEG is an effective strategy for biofilm inhibition.
• The 265 nm UEG demonstrates superior performance with notable energy efficiency.
• This technology offers a promising low-energy, environmentally friendly solution for marine, water treatment, and healthcare applications.