Document Detail

Growth and Repair Potential of Three Species of Bacteria in Reclaimed Wastewater after UV Disinfection.
MedLine Citation:
PMID:  22108329     Owner:  NLM     Status:  In-Data-Review    
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/cm(2), 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.
Meiting Guo; Jingjing Huang; Hongying Hu; Wenjun Liu
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Biomedical and environmental sciences : BES     Volume:  24     ISSN:  0895-3988     ISO Abbreviation:  Biomed. Environ. Sci.     Publication Date:  2011 Aug 
Date Detail:
Created Date:  2011-11-23     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  8909524     Medline TA:  Biomed Environ Sci     Country:  United States    
Other Details:
Languages:  eng     Pagination:  400-7     Citation Subset:  IM    
Copyright Information:
Copyright © 2011 The Editorial Board of Biomedical and Environmental Sciences. Published by Elsevier B.V. All rights reserved.
Environmental Simulation and Pollution Control State Key Joint Laboratory, School of Environment, Tsinghua University, Beijing 100084, China.
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