Growth and Repair Potential of Three Species of Bacteria in Reclaimed Wastewater after UV Disinfection

GUO MeiTing; HUANG JingJing; HU HongYing; LIU WenJun

doi:10.3967/0895-3988.2011.04.011

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Volume 24 Issue 4

Aug. 2011

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Article Navigation > Biomedical and Environmental Sciences > 2011 > 24(4): 400-407

GUO MeiTing, HUANG JingJing, HU HongYing, LIU WenJun. Growth and Repair Potential of Three Species of Bacteria in Reclaimed Wastewater after UV Disinfection[J]. Biomedical and Environmental Sciences, 2011, 24(4): 400-407. doi: 10.3967/0895-3988.2011.04.011

Citation:

GUO MeiTing, HUANG JingJing, HU HongYing, LIU WenJun. Growth and Repair Potential of Three Species of Bacteria in Reclaimed Wastewater after UV Disinfection[J]. Biomedical and Environmental Sciences, 2011, 24(4): 400-407. doi: 10.3967/0895-3988.2011.04.011

Growth and Repair Potential of Three Species of Bacteria in Reclaimed Wastewater after UV Disinfection

doi: 10.3967/0895-3988.2011.04.011

Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, China
Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, China;Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China

Funds: the National Science Fund for Distinguished Young Scholars of China

Abstract

Objective The growth and repair potential of three typical microorganisms in reclaimed water after UV disinfection was investigated to assess the effects of photo-reactivation and dark repair of microorganisms,and the microbial safety of reclaimed water following this procedure.Methods The growth and repair potential of Escherichia coli,a fecal coliform strain and Bacillus subtilis in the effluent of a biological wastewater treatment plant disinfected by a low-pressure UV lamp were investigated.Results Any increase in bacterial numbers in the effluent after UV disinfection was due to damage repair.Exposure to photo-reactivating light for 8-10 h after UV irradiation with a dose of 5 mJ/cm2,the highest percentage of photo-reactivation observed for E.coli and the fecal coliform strain was 29％ and 15％ respectively.B.subtilis showed little photo-reactivation under these conditions.The percentage of photo-reactivation was related to the UV dose and the photo-reactivating time,and a function was developed to forecast the final concentrations of E.coli and the fecal coliform strain after UV disinfection with possible photo-reactivation.Conclusion Different species of bacteria displayed different responses to UV light and different repair potentials.The repair of indigenous bacteria in wastewater needs to be investigated in future work.
- Wastewater reclamation,
- UV disinfection,
- Growth,
- Repair,
- Photo-reactivation,
- Dark repair
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通讯作者: 陈斌, bchen63@163.com

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沈阳化工大学材料科学与工程学院沈阳 110142

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Growth and Repair Potential of Three Species of Bacteria in Reclaimed Wastewater after UV Disinfection

doi: 10.3967/0895-3988.2011.04.011

Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, China

Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, China;Graduate School at Shenzhen, Tsinghua University, Shenzhen 518055, China

Funds: the National Science Fund for Distinguished Young Scholars of China

Key words:

Abstract: Objective The growth and repair potential of three typical microorganisms in reclaimed water after UV disinfection was investigated to assess the effects of photo-reactivation and dark repair of microorganisms,and the microbial safety of reclaimed water following this procedure.Methods The growth and repair potential of Escherichia coli,a fecal coliform strain and Bacillus subtilis in the effluent of a biological wastewater treatment plant disinfected by a low-pressure UV lamp were investigated.Results Any increase in bacterial numbers in the effluent after UV disinfection was due to damage repair.Exposure to photo-reactivating light for 8-10 h after UV irradiation with a dose of 5 mJ/cm2,the highest percentage of photo-reactivation observed for E.coli and the fecal coliform strain was 29％ and 15％ respectively.B.subtilis showed little photo-reactivation under these conditions.The percentage of photo-reactivation was related to the UV dose and the photo-reactivating time,and a function was developed to forecast the final concentrations of E.coli and the fecal coliform strain after UV disinfection with possible photo-reactivation.Conclusion Different species of bacteria displayed different responses to UV light and different repair potentials.The repair of indigenous bacteria in wastewater needs to be investigated in future work.

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