Inactivation of Escherichia coli using ultraviolet light emitting diodes (UV-LEDs), monochloramine (NH2CI) and the NH2CI/UV-LED process

Authors

Oriana Jovanovic, Hong Kong University of Science and TechnologyFollow
Ran Yin, Hong Kong University of Science and TechnologyFollow
Chii Shang, Hong Kong University of Science and TechnologyFollow
Chao Wang, Technological and Higher Education Institute of Hong Kong (THEi)Follow

Document Type

Conference Proceeding

Publication Date

2018

Keywords

E. coli, UV-LED/NH2CI, Synergism

Abstract

The purpose of this study is to examine the efficiency of monochloramine and UV-LEDs at four different wavelengths (i.e., 255, 265, 285 and 300 nm) for E. coli inactivation. And the potential benefit to E. coli inactivation in the case of sequential exposure to NH2Cl and UV-LEDs (the NH2Cl/UV-LED process) is also investigated. The data suggest that E. coli can be effectively inactivated by the combination of sublethal dose of monochloramine, followed by UV irradiation. Obvious synergism is observed at a relatively high UV dose (i.e., 6 mJ/cm2) and all four wavelengths.

Source Publication

The 2nd Disinfection and Disinfection By-Products Conference, 14-18 May 2018, Tsinghua University, Beijing, China

First Page

1

Last Page

4

Publisher Statement

The International Water Association

Recommended Citation

Jovanovic, O.,Yin, R.,Shang, C.,& Wang, C. (2018). Inactivation of Escherichia coli using ultraviolet light emitting diodes (UV-LEDs), monochloramine (NH2CI) and the NH2CI/UV-LED process. The 2nd Disinfection and Disinfection By-Products Conference, 14-18 May 2018, Tsinghua University, Beijing, China, 1-4. Retrieved from https://repository.vtc.edu.hk/thei-fac-sci-tech-sp/466