Browsing by Author "Crawford, W.A."
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Item Removal Of Metallic Contaminants From Industrial Waste Waters By The Use Of Greensands, A Preliminary Report(Newark, DE: Delaware Geological Survey, University of Delaware, 1975-01) Spoljaric, N.; Crawford, W.A.The Delaware Geological Survey, in cooperation with the U. S. Bureau of Mines, has investigated glauconite-bearing greensand deposits in Delaware for several years. The purpose of this effort is to find possible practical uses for this potentially important mineral resource. This report briefly describes the preliminary results of one phase of the study: application of greensands to the purification of industrial waste waters.Item Removal Of Metals From Laboratory Solutions And Landfill Leachate By Greensand Filters(Newark, DE: Delaware Geological Survey, University of Delaware, 1979-02) Spoljaric, N.; Crawford, W.A.Distilled water spiked with heavy metal cations was passed at a rate of 2-4 ml/min through a filter composed of greensand containing about 80 percent glauconite. The capability of the greensand to trap metal cations is increased by prolonging the contact time between the leachate and the greensand. Flushing the charged greensand filter with water does not cause significant release of cations back into solution, suggesting that polluted greensand might be disposed in landfills without adding pollutants to either ground or surface water in the vicinity.