农村分散式污水处理设施潜在致病细菌分布特征

污水是病原微生物传播的重要介质之一.目前我国大多数农村地区生活污水经生化处理后,极少进行消毒就直接排放至自然水体,这是否会造成农村地区污水中病原微生物的传播尚不明确.为此,以未开消毒设施的一体化污水净化槽为研究对象,在其稳定运行阶段,分析了不同处理单元、尤其是出水中细菌种群及潜在致病性细菌种类的特征.结果表明,与进水相...

Characterization of the potential pathogenic bacteria distribution in rural decentralized wastewater treatment facilities

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.