Growth and repair potential of three species of bacteria in reclaimed wastewater after UV disinfection / 生物医学与环境科学(英文)
Biomedical and Environmental Sciences
;
(12): 400-407, 2011.
Article
in English
| WPRIM
| ID: wpr-306846
ABSTRACT
<p><b>OBJECTIVE</b>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.</p><p><b>METHODS</b>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.</p><p><b>RESULTS</b>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.</p><p><b>CONCLUSION</b>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.</p>
Full text:
Available
Index:
WPRIM (Western Pacific)
Main subject:
Radiation Effects
/
Bacillus subtilis
/
Time Factors
/
Ultraviolet Rays
/
Water Microbiology
/
Waste Disposal, Fluid
/
Water Purification
/
Dose-Response Relationship, Radiation
/
Escherichia coli
Language:
English
Journal:
Biomedical and Environmental Sciences
Year:
2011
Type:
Article
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