KWRRI Research Reports


The purpose of this study was to investigate some of the properties of pesticides as they exist in water, and to determine the effectiveness of several water treatment processes in the removal of pesticides from water. Among the pesticides investigated were malathion, DDT, aldrin, dieldrin, captan, benzene hexachloride (BHC), 2,4-D, and 2,4,5-T. The water treatment processes included aeration, chemical coagulation, adsorption on activated carbons and clays, and foam separation.

The removal of pesticides from water by aeration was found to be significant. Dieldrin was removed almost 100 percent, while aldrin, DDT, and BHC were removed to a lesser extent. 2, 4, 5-T and cap tan showed no loss through aeration.

Chemical coagulation alone was found to be ineffective in the removal of pesticides from water. Several coagulant aids were investigated but all proved ineffective with the possible exception of one which increased the apparent removal slightly.

Of the processes investigated adsorption with activated carbon was determined to be the most effective in removing pesticides from water. The removals obtained were -- malathion near 100 percent; 2 ,4-D, 90 percent; DDT, 95 percent; aldrin, near 100 percent; dieldrin, 90 percent.

Studies on the removal of aldrin and dieldrin from water by the use of surface active agents to produce a foam demonstrated that this process might be of value as a treatment method, with removals greater than 90 percent being achieved in some cases.

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The work on which this report was based was supported in part by the U. S. Public Health Service, Division of Water Supply and Pollution Control (now the Federal Water Pollution Control Administration, Department of the Interior) under Contract No. WP-00476-02; and in part by the U.S. Department of the Interior, Office of Water Resources Research, under Contract No. 14-01-0001-911.