Evolution and health risk of indicator microorganisms in landscape water replenished by reclaimed water  

作　　者：Yitong Chen Chang Qi Yanan Yu Xiaoxin Cao Xiang Zheng Rong Cheng 

机构地区：[1]School of Environment&Natural Resources,Renmin University of China,Beijing 100872,China [2]The Administrative Office of the Old Summer Palace,Beijing 100084,China [3]China Water Environment Group Co.Ltd.,Beijing 101101,China

出　　处：《Journal of Environmental Sciences》2024年第12期186-197,共12页环境科学学报（英文版）

基　　金：supported by the National Natural Science Foundation of China(Nos.52070192 and 51778618).

摘　　要：As an important means to solve water shortage,reclaimed water has been widely used for landscape water supply.However,with the emergence of large-scale epidemic diseases such as SARS,avian influenza and COVID-19 in recent years,people are increasingly concerned about the public health safety of reclaimed water discharged into landscape water,especially the pathogenic microorganisms in it.In this study,the water quality and microorganisms of the Old Summer Palace,a landscape water body with reclaimed water as the only replenishment water source,were tracked through long-term dynamic monitoring.And the health risks of indicator microorganisms were analyzed using Quantitative Microbial Risk Assessment(QMRA).It was found that the concentration of indicator microorganisms Enterococcus(ENT),Escherichia coli(EC)and Fecal coliform(FC)generally showed an upward trend along the direction of water flow and increased by more than 0.6 log at the end of the flow.The concentrations of indicator microorganisms were higher in summer and autumn than those in spring.And there was a positive correlation between the concentration of indicator microorganisms and COD.Further research suggested that increased concentration of indicator microorganisms also led to increased health risks,which were more than 30%higher in other areas of the park than the water inlet area and required special attention.In addition,(water)surface operation exposure pathway had much higher health risks than other pathways and people in related occupations were advised to take precautions to reduce the risks.

关 键 词：Reclaimed water Landscape water The old summer palace Indicator microorganisms Pearson correlation analysis Redundancy analysis Health risk Quantitative microbial risk assessment(QMRA) 

分 类 号：X820.4[环境科学与工程—环境工程]