Dynamic Existence of Waterborne Pathogens within River Sediment Compartments. Implications for Water Quality Regulatory Affairs
Dynamic Existence of Waterborne Pathogens within River Sediment Compartments. Implications for Water Quality Regulatory Affairs
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DOI：
10.1021/es802321w
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发表时间：
2009-03-15
影响因子：
11.4
通讯作者：
Trapp, Brian
中科院分区：
文献类型：
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作者：
Droppo, Ian G.;Liss, Steven N.;Trapp, Brian
大肠杆菌和沙门氏菌的运输和命运的指示剂被证明是高度影响他们与絮凝悬浮和床沉积物颗粒的关系。絮凝体被发现占主导地位的悬浮泥沙负荷，并有增加向下通量的沉积物的河床的效果。细菌计数始终较高的沉积物隔间（悬浮和床）比单独的水，与床沉积物被认为是一个可能的水库的病原体随后重新动员和运输到潜在的高风险地区。沉积物中微生物附着和截留的机制与水生系统生物群落分泌的EPS纤维密切相关。建议公共卫生官员应关注沉积物/病原体的关系，因为其对病原体源命运的潜在影响和对公共卫生风险评估的影响。然而，目前的标准取样策略是基于细菌完全是浮游生物的假设，没有考虑到沉积物隔室中细菌的潜在重要浓度。缺乏对病原体/沉积物关联的了解可能导致对公共卫生风险的估计不准确，因此，可能需要修改采样策略以反映这种关联。
The transport and fate of indicator E coli and Salmonella are shown to be highly influenced by their relationship with flocculated suspended and bed sediment particles. Flocs were found to dominate the suspended sediment load and have the effect of increasing the downward flux of the sediment to the river bed. Bacteria counts were consistently higher within sediment compartments (suspended and bed) than for the water alone, with the bed sediment found to represent a possible reservoir of pathogens for subsequent remobilization and transport to potentially high risk areas. The mechanism of microbial attachment and entrapment within the sediment was strongly linked to the EPS fibrils secreted by the biological consortium of the aquatic system. It is suggested that the sediment/pathogen relationship should be of concern to public health officials because of its potential effects on pathogen source fate and effect with implications on public health risk assessment. Current standard sampling strategies, however, are based on an assumption that bacteria are entirely planktonic and do not account for the potentially significant concentration of bacteria from the sediment compartments. The lack of understanding around pathogen/sediment associations may lead to an inaccurate estimate of public health risk, and, as such, possible modification of sampling strategies to reflect this association may be warranted.