已经开发了数值健康风险评估模型,以使用大肠杆菌作为指示细菌来描述水的粪便污染。尽管许多先前建立的水生环境中大肠杆菌的数值模型只考虑了温度和阳光等一个或两个水质参数的影响,由于水生环境是一个复杂的系统,因此仅用一个或两个参数很难模拟大肠杆菌的存活。本研究进行了一系列比较实验,以选择在湖泊中大肠杆菌生存的数值模型中应优先考虑的水质参数。考虑的参数是温度,pH值,溶解氧(DO),总溶解固体(TDS),悬浮固体(SS),共存的微生物,和光强度。在实验室实验中,通过控制这七个参数中的两个来观察大肠杆菌的存活,并对这些参数对大肠杆菌种群变化率的影响进行了统计学比较。因此,光照强度对大肠杆菌的存活影响最大,其次是共存的微生物,温度,pH值,和TDS。然而,DO和SS对存活率的影响小于其他参数。在温度和TDS以及温度和共存微生物之间观察到对大肠杆菌存活的高影响相互作用。这些结果表明,应修改模拟湖泊中大肠杆菌生存的现有数值模型,以考虑阳光等多个参数的独立和交互影响。共存的微生物,温度,pH值,和TDS。
Numerical health risk assessment models have been developed to describe faecal contamination of water using Escherichia coli as an indicator bacterium. Although many previously established numerical models for E. coli in aquatic environments have only considered the effects of one or two water quality parameters such as temperature and sunlight, it is difficult to simulate E. coli survival with only one or two parameters because the aquatic environment is a complex system. This study conducted a series of comparative experiments to select water quality parameters that should be preferentially considered in a numerical model for E. coli survival in lakes. The parameters considered were temperature, pH, dissolved oxygen (DO), total dissolved solids (TDS), suspended solids (SS), coexisting microbes, and light intensity. In the laboratory experiments, the survival of E. coli was observed by controlling two of these seven parameters, and the effects of these parameters on the rate of E. coli population change were statistically compared. Consequently, light intensity affected the survival of E. coli most significantly, followed by the presence of coexisting microbes, temperature, pH, and TDS. However, DO and SS had smaller effects on survival than other parameters. High-impact interactions on E. coli survival were observed between temperature and TDS and temperature and coexisting microbes. These results suggest that existing numerical models for simulating E. coli survival in lakes should be modified to consider the independent and interactive effects of multiple parameters such as sunlight, coexisting microbes, temperature, pH, and TDS.