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首页> 外文期刊>Environmental Science & Technology >Dynamic Existence Of Waterborne Pathogens Within River Sediment Compartments. Implications For Water Quality Regulatory Affairs
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Dynamic Existence Of Waterborne Pathogens Within River Sediment Compartments. Implications For Water Quality Regulatory Affairs

机译：河流沉积室内的水生病原体的动态存在。对水质监管事务的影响

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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.
机译：指示剂大肠杆菌和沙门氏菌的运输和结局受其与絮凝的悬浮颗粒和床沉积物颗粒的关系影响很大。人们发现絮凝物对悬浮的泥沙负荷起主导作用，并具有增加泥沙向下流向河床的作用。沉积物区室（悬浮和床层）的细菌数量始终高于单独的水，发现床层沉积物代表可能的病原体库，以便随后转移和运输到潜在的高风险地区。微生物在沉积物中的附着和截留的机制与水生生物群落所分泌的EPS原纤维紧密相关。建议沉积物/病原体之间的关系应引起公共卫生官员的关注，因为它可能对病原体来源的命运产生潜在影响，并可能影响公共卫生风险评估。但是，当前的标准采样策略是基于细菌完全是浮游生物并且没有考虑到来自沉积物隔室的细菌潜在浓度的假设。对病原体/沉积物关联的缺乏了解可能会导致对公共健康风险的估计不准确，因此，可能需要修改抽样策略以反映这种关联。

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