科研之友
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摘要
Wastewater is considered as one of the important transmission media of pathogenic microorganisms. At present, most domestic wastewater in rural areas of China is discharged directly to natural water after biochemical treatment with rare disinfection, and it is not clear whether this causes the transmission of pathogenic microorganisms in wastewater in rural areas. In this study, the characteristics of bacterial populations and potentially pathogenic bacterial species in different treatment units, especially in effluent, were analyzed at the stable operation stage of integrated Johkasou without running disinfection facility. The results showed that compared with the influent, each unit of the Johkasou contained a certain amount of potential pathogenic bacteria. Especially in the effluent, 20 species of potential pathogenic bacteria were detected, mainly were Flavobacterium and Pseudomonas. The relative contents of some potential pathogens showed an increasing trend along the wastewater treatment process. For example, Aeromonas, Klebsiella, Arcobacter and Bacteroides were almost not detected in the influent, and their relative abundances were 0%, 0%, 0.01% and 0.21%, respectively, but their relative abundances detected in the effluent were 1.26%, 0.70%, 0.24% and 2.63%, respectively. The preliminary results of this study show that there are certain potential pathogenic microorganisms in all sections of domestic wastewater biological treatment facilities in rural areas. And it is especially noteworthy that the effluent also contained a variety of potential pathogenic microorganisms without disinfection, and its discharge may have certain effects on the surrounding environment and human health. The results of this study will provide a basis for the health risk assessment of subsequent small-scale wastewater treatment facilities in rural areas.
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