Disinfection of water by using laser radiation

Zimbelmann, Stanislav; Hermsdorf, Jörg; Emde, Benjamin

doi:10.1016/j.procir.2022.08.123

Cited by 3 publications

(1 citation statement)

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“…The first experiments with blue laser-treated marine biofilm-overgrown metal surfaces by the authors of the present publication revealed biofilm bleaching and final removal by the drag of the current [36]. A general sterilizing effect of the blue laser radiation on seawater was observed [37].…”

Section: Introductionmentioning

confidence: 53%

Antibiotic Effect of High-Power Blue Laser Radiation

Hintmann,

Zimbelmann,

Emde

et al. 2024

Photonics

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The development of sustainable alternatives to chemical and mechanical biofilm removal for submerged technical devices used in freshwater and marine environments represents a major technical challenge. In this context, the antibiotic impact of blue light with its low absorption underwater provides a potentially useful alternative. However, former technical limitations led to hours of treatment. Here, we applied high-power blue laser irradiation (1500 W) with a wavelength of 448 nm to demonstrate its strong antibiotic and algicidal effect on different bacteria and algae in seconds. High-power blue light treatment (139 W/cm2) for only 8.9 s led to the efficient deactivation of all tested organisms. Analyses of the underlying biological mechanisms revealed the absorption of the blue light by endogenous chromophores (flavins, tetrapyrroles) with the generation of reactive oxygen species (ROS). In agreement, Escherichia coli transcriptome analyses demonstrated a stress response at the level of DNA damage repair, respiration, and protein biosynthesis. Spectroscopic measurements of the irradiated algae indicated the irreversible damage of chlorophyll by photooxidation with the formation of singlet oxygen. In conclusion, high-power blue laser radiation provides a strong sustainable tool for the removal of biofouling in a very short time for applications in aquatic systems.

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Section: Introductionmentioning

confidence: 53%