自然科学版 英文版
自然科学版 英文版
自然科学版 英文版

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中南大学学报(英文版)

Journal of Central South University

Vol. 23    No. 12    December 2016

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UV-TiO2 photocatalytic disinfection and photoreactivation of pathogenic bacterium in municipal wastewater
WANG Xi-feng(王西峰)1, HU Xiao-lian(胡晓莲)1, GONG Xin(龚昕)1, BAN Yun-xiao(班云霄)2

1. School of Civil Engineering, Hunan University of Science and Technology, Xiangtan 411201, China;
2. School of Environmental and Municipal Engineering, Lanzhou Jiaotong University, Lanzhou 730070, China

Abstract:The disinfected bacteria will be a photoreactivation under the irradiation of the sunlight, and the light intensity plays an important role in the bacteria resurrection. The effect of light intensity on photoreactivation of Escherichia coli (E. coli) and Enterococcus faecalis (E. faecalis) in secondary effluents which were disinfected respectively by pure UV and UV-TiO2 was investigated. The results show that the disinfection efficiency of UV-TiO2 is much higher than that of the pure UV disinfection. The photoreactivation rate of E. coli is much higher in pure UV disinfection than in UV-TiO2 photocatalytic disinfection. Under high light intensity in UV-TiO2 disinfection, high resurrection rate can be induced. However, a higher resurrection rate can be introduced even under low light intensity in pure UV disinfection alone. Meanwhile, UV-TiO2 disinfection has a strong inhibition effect on E. faecalis photoreactivation. When the light intensity is lower than 21 μW/cm2, nearly no resurrection of E. faecalis occurs after 72 h resurrection irradiation, and a little resurrection rate is observed only under a strong photoreactivating light intensity.

 

Key words: pathogenic bacteria inactivate; UV-TiO2 disinfection; photoreactivation; Escherichia coli (E. coli); Enterococcus faecalis (E. facialis)

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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