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Comparison of UVA-LED and UVC-LED for Water Disinfection: Inactivation of Escherichia Coli

  • Zhilin Ran
  • Meng Yao
  • Shaofeng LiEmail author
Conference paper
  • 23 Downloads
Part of the Environmental Science and Engineering book series (ESE)

Abstract

Disinfection is an essential part of the water treatment process, ensuring the destruction of pathogenic microorganisms present in aquatic systems. The inactivation of Escherichia coli (E. coli) in water was investigate after irradiating by UV-LED. When the radiation dose was 24.48 mJ/cm2, the log inactivation of E. coli was more than 4. The effects of UV-LED parameters (wavelength, UV irradiation intensity), water quality factors (temperature, pH value) were investigated on the E. coli inactivation rate. At shorter UV-LED wavelengths, E. coli inactivation increased as UVC-LED radiation intensity is stronger. Temperature, pH value of E. coli inactivated effect. The mechanism of UVC-LED inactivation of E. coli was studied by scanning electron microscopy and system soluble protein detection, showing that the UVC-LED bactericidal activity involved the destruction of E. coli nucleic acids and to a lesser degree through protein damage.

Keywords

UV light-emitting diodes E. coli Inactivation Mechanism 

Notes

Acknowledgements

This research was funded by the project of Shenzhen Institute Information Technology (PT201703), the Science and Technology Project of Shenzhen Institute of information technology (SZIIT2019KJ006), Innovation and Enhancing College Project of Guangdong Province, China (2017GKTSCX065).

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Copyright information

© Springer Nature Switzerland AG 2020

Authors and Affiliations

  1. 1.Institute of Innovational Education ResearchShenzhenChina
  2. 2.Department of Building and Environmental EngineeringShenzhen PolytechnicShenzhenChina

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