Flow-Associated Reduction in the Hydraulic Conductivity of Quartz Sand
1962
Gupta, Rajinder P. | Swartzendruber, D. (Dale)
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.
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