Abstract
The disposal of liquid wastes into suitable aquifers that contain saline water (salaquifiers) has proven to be technically feasible. The practice is widespread and the total number of waste-injection wells operating in the United States reached almost 270 by 1972. One of the principal conclusions is that if the waste is heavier than the water in the storage aquifer, the waste will tend to move downdip until it reaches a boundary or the axis of a syncline. Thus chances are very small that the waste will escape through the roof of the salaquifer. In the field, therefore, the dip of the aquifer, the direction and rate of preexisting ground water movement, and the density difference between native and injected fluids (assumed to be miscible) are the most significant parameters for evaluating possible safety (and success) of the project.
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