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首页> 外文期刊>International Journal of Environmental Research and Public Health >Microbial Remobilisation on Riverbed Sediment Disturbance in Experimental Flumes and a Human-Impacted River: Implication for Water Resource Management and Public Health in Developing Sub-Saharan African Countries
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Microbial Remobilisation on Riverbed Sediment Disturbance in Experimental Flumes and a Human-Impacted River: Implication for Water Resource Management and Public Health in Developing Sub-Saharan African Countries

机译：实验性水渠和人为影响的河流中河床沉积物紊乱的微生物迁移：对发展中撒哈拉以南非洲国家的水资源管理和公共卫生的影响

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摘要

Resuspension of sediment-borne microorganisms (including pathogens) into the water column could increase the health risk for those using river water for different purposes. In the present work, we (1) investigated the effect of sediment disturbance on microbial resuspension from riverbed sediments in laboratory flow-chambers and in the Apies River, Gauteng, South Africa; and (2) estimated flow conditions for sediment-borne microorganism entrainment/resuspension in the river. For mechanical disturbance, the top 2 cm of the sediment in flow-chambers was manually stirred. Simulating sudden discharge into the river, water (3 L) was poured within 30 s into the chambers at a 45° angle to the chamber width. In the field, sediment was disturbed by raking the riverbed and by cows crossing in the river. Water samples before and after sediment disturbance were analysed for Escherichia coli . Sediment disturbance caused an increase in water E. coli counts by up to 7.9–35.8 times original values. Using Shields criterion, river-flow of 0.15–0.69 m 3 /s could cause bed particle entrainment; while ~1.57–7.23 m 3 /s would cause resuspension. Thus, sediment disturbance in the Apies River would resuspend E. coli (and pathogens), with possible negative health implications for communities using such water. Therefore, monitoring surface water bodies should include microbial sediment quality.
机译：沉积物传播的微生物（包括病原体）重新悬浮到水柱中，可能会增加使用河水用于不同目的的人的健康风险。在目前的工作中，我们（1）研究了沉积物扰动对实验室流动室和南非豪登省Apies河中河床沉积物微生物重悬的影响; （2）估算河流中沉积物携带的微生物的夹带/再悬浮的流量条件。对于机械干扰，手动搅拌流动室中的顶部2 cm沉积物。模拟突然向河中排放，在30秒内将水（3 L）以与水箱宽度成45°的角度倒入水箱中。在田间，泥沙被耙河床和在河中穿越的母牛所扰动。分析沉积物干扰前后的水样中的大肠杆菌。泥沙扰动导致水中大肠杆菌的数量最多增加了原始值的7.9-35.8倍。根据Shields准则，河水流量0.15–0.69 m 3 / s可能导致床层颗粒夹带。 〜1.57–7.23 m 3 / s会导致重悬。因此，阿佩斯河中的沉积物扰动将使大肠杆菌（和病原体）重新悬浮，这对使用此类水的社区可能产生不利的健康影响。因此，监测地表水体应包括微生物沉积物质量。

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