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《Journal of Southeast University(Natural Science Edition)》 2010-03
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Microbial community structure and predominant bacteria in water purification process

Xiang Hong1,2,3 Lü Xiwu1 Yin Lihong2 Zhu Guangcan1 Liu Ran2 Su Yaoyao2 Yang Fei2(1 School of Energy and Environment,Southeast University,Nanjing 210096,China)(2School of Public Health,Southeast University,Nanjing 210009,China)(3Guizhou Provincial Center for Disease Prevention and Control,Guiyang 550004,China)  
The microbial community structure and diversity in biological activated carbon and the biologically-enhanced filtration processes are analyzed by polymerase chain reaction single-strand conformation polymorphism(PCR-SSCP).The culturable predominant bacteria in the biological activated carbon filter and the biologically-enhanced active filter are investigated by the most probable number method.The results show that water purification processes of flocculation,sand filtration and biologically-enhanced filtration have no remarkable effect on the microbial community structure.However,due to the powerful adsorption for microorganisms on activated carbon,the diversity of the microbial community of the raw water is reduced after the biological activated carbon process.The analysis results of the cultivable microbial communities on R2A medium show that the cultivable microbial diversity in biofilters is comparatively rich.The Dice similarity coefficients among filters range from 0.69 to 0.86,which indicate that the differences in community species are not obvious.The main culturable predominant bacteria in the biological activated carbon filter and biologically-enhanced active filter are Bacillus megatherium,Bacillus pumilus,Bacillus cereus,Citrobacter freundii,Aeromonas caviae,Pseudomonas putida and Klebsiella pneumoniae.The combination of the PCR-SSCP technique and the conventional culture method can explore predominant bacteria in biofilters and improve efficiency in biological water treatment.
【Fund】: 江苏省建设厅科技计划资助项目(JS2007-JH22)
【CateGory Index】: TU991.2
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