Abstract
The feasibility of using geothermal resources to increase the flow of the Colorado River and as a source of concurrent electrical energy is evaluated in the context of experiments conducted in Imperial Valley, Calif. The method of finding geothermal reservoirs, injection operations, and seismic and subsidence monitoring are described. One problem faced is the high salinity content of geothermal brines. Three types of desalting units were tested: a multistage flash unit, a vertical tube evaporator unit, and a high temperature electrodialysis unit. All three desalting systems have thus far been used successfully to desalt geothermal fluid, and the problems associated which each system have been identified, along with probable solutions. Productivity of geothermal reservoirs, injection capabilities, compatibility of fluids, environmental concerns, and the source of replacement fluid determine the economic feasibility of geothermal desalting. Tests to explore problems and to judge the possible use of concurrent power production in the desalting process are continuing. (5 diagrams, 2 photos, 5 references, 4 tables)
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