Study on the inactivation characteristics of chlorine-resistant bacteria by different ultraviolet light sources
Disinfection is an important part of ensuring the safety of drinking water,but it in-evitably exacerbates the screening and strengthening of chlorine-resistant bacteria.Compared with traditional mercury lamps,ultraviolet light-emitting diodes(UV-LEDs)and KrCl excimer lamps as innovative technologies for inactivating microorganisms have multiple advantages.This study took two pathogenic chlorine-resistant bacteria,Pseudomonas and Acinetobacter,screened from the wa-ter supply network as the research objects,and conducted experimental studies on the inactivation characteristics of chlorine-resistant bacteria using different ultraviolet bands,including traditional ultraviolet lamp LPUV(254 nm),emerging UV-LEDs(265 nm,285 nm),and 222 nm KrCl exci-mer lamp.The results showed that all four ultraviolet bands had high inactivation effects on the two chlorine-resistant bacteria,with a 2～5 log inactivation rate at a low dose(8～10 mJ/cm2).The inactivation effect of the four light sources on the two chlorine-resistant bacteria was ranked as follows:265 nm＞254 nm＞285 nm＞222 nm,while the sensitivity of the two bacteria to different wavelengths was compared as follows:265 nmm＞254 nm＞222nm＞285 nm.In general,UV-LED 265 nm had the best inactivation effect on the two chlorine-resistant bacteria.Based on the research results,suggestions for the application of emerging ultraviolet disinfection technology processes were proposed from the aspects of treatment effect and applicability of chlorine-resistant bacteria.
万方数据
维普
