在小型供水系统中为期两年的微生物水质监测:对微生物风险管理的影响
Jie Zeng1, Tomohiro Nakanishi2, Sadahiko Itoh1
1Department of Environmental Engineering, Graduate School of Engineering, Kyoto University, Kyoto University Katsura, Nishikyo, Kyoto, 615-8540, Japan.
Environmental management
|May 20, 2024
概括
日本的小型供水系统往往缺乏监管和处理,导致微生物污染. 研究表明,这些系统带来了不可接受的健康风险,需要有效的水处理来确保安全.
科学领域:
- 环境微生物学环境微生物学
- 公共卫生 公共卫生
- 评估水质水质的评估.
背景情况:
- 日本的小型供水系统 (SWSS) 经常在没有监管监督的情况下运行.
- 关于未受监管的SWSS中微生物污染和健康风险的数据有限,特别是那些使用山脉溪流的SWSS.
研究的目的:
- 通过山脉溪流评估未受监管的SWSS的微生物水质.
- 评估这些系统中微生物污染带来的相关健康风险.
- 确定必要的水处理干预措施,以确保微生物安全.
主要方法:
- 在四个未经处理的SWSS中监测微生物水质超过两年.
- 量化异质型板数和总细菌负载 (16S rDNA).
- 检测到便指标细菌 (FIB),如大肠杆菌和杆菌.
- 对大肠杆菌O157:H7和Campylobacter jejuni.的评估健康风险,包括感染和因残疾而调整的寿命年 (DALYs).
主要成果:
- 平均异质状板数低于350 CFU/mL;总细菌负荷在4.71至5.35 log10 副本/mL之间.
- 持续存在的便指标细菌表明了潜在的便污染.
- 估计的年均感染风险和DALYs在所有研究的SWSS中都超过了目标病原体的可接受水平.
结论:
- 使用山脉溪流的未经处理的SWSS存在严重的微生物污染和健康风险.
- 通过水处理,使微生物负荷平均减少5-6 log10是必要的,以确保安全.
- 这些发现支持对SWSS实施基于风险的水资源管理策略.
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