USE OF COLLOID FILTRATION THEORY IN MODELING MOVEMENT OF BACTERIA THROUGH A CONTAMINATED SANDY AQUIFER
USE OF COLLOID FILTRATION THEORY IN MODELING MOVEMENT OF BACTERIA THROUGH A CONTAMINATED SANDY AQUIFER
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DOI：
10.1021/es00013a021
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发表时间：
1991-01-01
影响因子：
11.4
通讯作者：
GARABEDIAN, SP
中科院分区：
文献类型：
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作者：
HARVEY, RW;GARABEDIAN, SP
一个过滤模型，通常用来描述去除胶体填充床过滤在水处理应用程序进行了修改，用于描述细菌在桑迪，含水层沉积物的向下梯度传输。修改后的模型被施加到一个小规模的（7米），自然梯度示踪剂测试和观察的土著细菌种群移动downgradient内的有机污染的地下水在科德角，MA羽流的结果。该模型合理占标记的细菌出现在采样器downgradient从注入井在示踪剂实验中的浓度历史和观察到的0.25 μ m的平均细胞长度增加的未标记的，土著细菌种群，0.6公里downgradient从源羽。在将过滤理论应用于涉及地下水中细菌迁移的问题时，有几个不确定性是显而易见的。然而，吸附（附件）似乎是一个主要的控制程度的细菌运动downgradient，这可以描述，在一定程度上，过滤理论。碰撞效率因子代表了决定细菌吸附到谷物表面的物理化学因子，其估计值在5.4 × 10 - 3至9.7 × 10 - 3之间。
A filtration model commonly used to describe removal of colloids during packed-bed filtration in water treatment applications was modified for describing downgradient transport of bacteria in sandy, aquifer sediments. The modified model was applied to the results of a small-scale (7 m), natural-gradient tracer test and to observations of an indigenous bacterial population moving downgradient within a plume of organically contaminated groundwater in Cape Cod, MA. The model reasonably accounted for concentration histories of labeled bacteria appearing at samplers downgradient from the injection well in the tracer experiment and for the observed 0.25-mu-m increase in average cell length for an unlabeled, indigenous bacterial population, 0.6 km downgradient from the source of the plume. Several uncertainties were apparent in applying filtration theory to problems involving transport of bacteria in groundwater. However, adsorption (attachment) appeared to be a major control of the extent of bacterial movement downgradient, which could be described, in part, by filtration theory. Estimates of the collision efficiency factor, which represents the physicochemical factors that determine adsorption of the bacteria onto the grain surfaces, ranged from 5.4 x 10(-3) to 9.7 x 10(-3).