Aerosol exposure assessment during reclaimed water utilization in China and risk evaluation in case of Legionella  

作　　者：Menghao Chen Liangliang Shi Gang Liu Xiaojin Wu Yun Lu 

机构地区：[1]State Key Joint Laboratory of Environmental Simulation and Pollution Control,State Environment Protection Key Laboratory of Microorganism Application and Risk Control,School of Environment,Tsinghua University,Beijing,100084,China

出　　处：《Frontiers of Environmental Science & Engineering》2022年第7期173-183,共11页环境科学与工程前沿（英文）

基　　金：supported by the Major Water Project of China(No.2017ZX07103);the National Key R&D Program of China(2018YFC0406300).

摘　　要：Reclaimed water utilization provides an effective way to alleviate water shortage.However,the residual pathogens in the recycled water like Legionella,could be spread into the air as aerosols through water-to-air transmission process.Inhaling the aerosols by the people nearby increases their susceptibility to diseases.For estimating the health risks associated with the potential exposure of airborne Legionella emitted from the urban use of reclaimed water in China,nationwide questionnaire was designed to investigate the exposure habits of Chinese population in different scenarios.Quantitative microbial risk assessment(QMRA)served as the suitable explanatory tool to estimate the risk.The results indicated that annual infection probability of populations exposed to Legionella for three scenarios,0.0764(95%CI:0.0032−0.6880)for road cleaning,1.0000(95%CI:0.1883−1.0000)for greenfield irrigation,0.9981(95%CI:0.0784−1.0000)for landscape fountain,were markedly higher than the threshold recommended by WHO(10^(−4) per person per year(pppy))according to the concentration distribution of Legionella in the reclaimed water.An age-,educational background-,region-and gender-specific data in annual infection probability also showed different tendencies for some subpopulations.This study provides some detailed information on the health risks from the water reuse in China and will be useful to promote the safe application of reclaimed water in water-deficient areas.

关 键 词：LEGIONELLA QMRA Reclaimed water AEROSOL Water reuse 

分 类 号：X703[环境科学与工程—环境工程] O648.18[理学—物理化学]