Flow‐Associated Reduction in the Hydraulic Conductivity of Quartz Sand
Flow‐Associated Reduction in the Hydraulic Conductivity of Quartz Sand
复制标题
石英砂水力传导率与流量相关的降低
DOI：
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发表时间：
1962
期刊：
影响因子：
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通讯作者：
D. Swartzendruber
中科院分区：
文献类型：
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作者：
Rajinder P. Gupta;D. Swartzendruber
石英砂对常温沸腾去离子水的渗透系数随流量的延长而显著降低。这种影响局限在渗透率计单元中沙的入口端附近。如果在水中加入0.1%的苯酚，则电导率没有下降。此外，如果流动系统保持在略高于冰点的温度，这种下降也可以很好地消除。流量终止后，对渗透仪单元中的沙子进行采样，检测细菌数量和胶体+可溶性二氧化硅的含量。发现了细菌的特征分布，包括入口末端的细菌数量很高，而细胞其余部分的细菌数量要少得多。研究还发现，每克沙子中的细菌数量低于400,000个时，电导率没有显著下降；超过这个数字，电导率确实出现了大幅下降。渗透系数与胶体+可溶性二氧化硅的含量无关。
The hydraulic conductivity of quartz sand for boiled deionized water at room temperature was found to decrease markedly during prolonged flow. The effect was found to be localized near the inlet end of the sand in the permeameter cell. No decrease in conductivity occurred if 0.1% phenol was added to the water. Also, the decrease was reasonably well eliminated if the flow system was kept at a temperature just above freezing. After flow was terminated, the sand in the permeameter cells was sampled for number of bacteria and content of colloidal plus soluble silica. A characteristic distribution of bacteria was found, consisting of a high number at the inlet end and a much lower number in the rest of the cell. It was also found that major reductions in conductivity did not occur for numbers below 400,000 bacteria per g. of sand; above this number, drastic reduction did occur. No relationship was found between hydraulic conductivity and the content of colloidal plus soluble silica.