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SONG Zhi-wen**, SUN Qun, XU Ai-ling, QIAN Sheng-cai, LIU Ling-li, FENG Meng-xue
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Abstract: More and more attention has been paid to the potential of constructed wetland in reducing the indicator- and pathogenic microorganisms in wastewater. In this study, six indicator- and pathogenic microorganisms (total coliforms, faecal coliforms, fecal streptococci, Escherichia coli, Clostridium perfringens, and Salmonella spp.) were selected to evaluate their removal rate, correlations, and dynamic distribution features in a full scale free-surface flow constructed wetland by the methods of multi-tube fermentation and plate culture. Among the six indicator- and pathogenic microorganisms in the influent of the wetland, Salmonella spp. had the highest individual number, followed by total coliforms, faecal coliforms, C. perfringens, E. coli, and fecal streptococci. The constructed wetland could effectively remove the total coliforms, faecal coliforms, and E. coli, with an average annual removal rate of 94.1%, 93.4%, and 84.0%, respectively. However, the removal rate of Salmonella spp. and C. perfringens was relatively low, with an average annual removal rate of 55.8% and 63.6%, respectively, and existing greater fluctuation. The individual number of fecal streptococci was higher in effluent than in influent. No significant difference was observed in the removal rate of indicator- and pathogenic microorganisms between different seasons, but significant differences were found in the influent total coliforms concentration, influent and effluent Salmonella spp. concentrations, and influent C. perfringens concentration between different seasons. Correlation analysis indicated that there were stronger correlations among the total coliforms, fecal coliforms, and Escherichia coli, but weaker correlations between the Salmonella spp. and fecal coliforms and between the C. perfringens and the total coliforms and fecal coliforms.
SONG Zhi-wen**, SUN Qun, XU Ai-ling, QIAN Sheng-cai, LIU Ling-li, FENG Meng-xue. Dynamic distribution and correlation analysis of indicator- and pathogenic microorganisms in a surface-flow constructed wetland.[J]. cje.
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URL: http://www.cje.net.cn/EN/abstract/abstract20830.shtml
http://www.cje.net.cn/EN/Y2013/V32/I1/91