进行比较实验,选择水质参数,以建模大肠杆菌在湖泊中的存活率
Ichiro Yoneda1, Masateru Nishiyama2, Toru Watanabe2
1Department of Regional Environment Creation, United Graduate School of Agricultural Sciences, Iwate University, 18-8 Ueda 3-Chome, Morioka, 020-8850, Japan.
Environmental pollution (Barking, Essex : 1987)
|June 23, 2024
概括
光强度和共存的微生物显著影响大肠杆菌 (E. coli) 在湖泊中的生存率. 改进的数值模型应该结合这些因素以及温度,pH和TDS,以准确评估健康风险.
科学领域:
- 环境微生物学环境微生物学
- 水质建模水质建模
- 公共卫生风险评估 公共卫生风险评估
背景情况:
- 数字模型用于通过标志性细菌 (如大肠杆菌 (E. coli)) 来评估便污染的健康风险.
- 现有的模型往往通过仅考虑一个或两个水质参数来简化大肠杆菌的生存,而忽视了水生环境的复杂性.
研究的目的:
- 确定关键的水质参数,以准确的数值建模湖泊中的大肠杆菌存活率.
- 为了比较多种环境因素对大肠杆菌生存能力的个别和相互作用影响.
主要方法:
- 实验室实验是为了在受控条件下评估大肠杆菌的存活率.
- 评估了七个水质参数:温度,pH,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.
- 使用统计分析来比较这些参数及其相互作用对大肠杆菌种群动态的影响.
主要成果:
- 光强度对大肠杆菌的生存有最显著的影响,其次是共存的微生物,温度,pH和TDS.
- 与其他参数相比,溶解氧和悬浮固体对大肠杆菌存活的影响很小.
- 在温度和TDS之间,以及温度和共存的微生物之间,发现了对大肠杆菌生存的显著相互作用效应.
结论:
- 现有的大肠杆菌在湖泊中的生存数值模型需要改进,以包括多个有影响力的参数.
- 准确模拟大肠杆菌的动态需要考虑光强度,共存的微生物,温度,pH和TDS,包括它们的相互作用.
- 改进的模型将导致对水传播病原体的健康风险评估更可靠.
相关概念视频
01:19Quality of Water
In concrete preparation, the quality of water is paramount as it affects the strength and durability of the concrete. Potable water is usually preferred; however, it must not have excessive sodium or potassium to prevent compromising the concrete's integrity. Water quality is typically evaluated based on impurities such as dissolved solids, chlorides, and sulfates, and its pH value is ideally between 6 and 8. Even slightly acidic natural water may be acceptable unless it contains harmful...
01:14Testing Water Quality
When the quality of water for concrete preparation is uncertain, its impact on the setting time of cement and compressive strength of mortar is assessed by comparison with de-ionized or distilled water benchmarks. American Society for Testing and Materials (ASTM) C1602 requires the setting times to be within 90 minutes of the control, British Standard (BS) 3146:1980 allows a 30-minute variance in the initial setting, while British Standards European Norm (BS EN) 1008 specifies initial setting...
01:24Freshwater Microbial Ecology
Freshwater systems such as streams, rivers, and lakes exhibit distinct physical and biological characteristics that influence their microbial communities. These environments are broadly categorized into lotic systems—those with flowing waters like streams and most rivers—and lentic systems, which include still or slow-moving waters such as lakes, ponds, and marshes.In lentic systems, phytoplankton drive primary production, generating autochthonous organic carbon. In contrast, lotic systems...