OCR Text |
Show 96 1.229). Thus, the total concentration of dissolved salts required to cause halite precipitation has increased from about 329 grams per liter to 338 grams per liter. Thus, the precipitation of halite within the Lake decreases the quality of the brines for common salt production. A high quantity of sodium and chloride is necessary for economical common salt production. The range of sodium chloride content of the various brines, expressed as a percentage of total dissolved solids, is as follows: TABLE 16 PERCENT NaCl IN DISSOLVED SOLIDS Brine Minimum Maximum Pre- fill 81 ( 3- 10- 32) 96 ( 3- 10- 32) Shallow S. Arm 86 ( 1961, 1963, 1965, 1972, 1973) 90 ( 1973) Deep S. Arm 85 ( 1972) 86 ( 1966, 1969, 1973) North Arm 84 ( 1964, 1965) 86 ( 1973) In addition to affecting needed pond area for solar evaporation, dilution greatly increases the quantity of brine to be handled by pumping. For instance, slightly more than three tons of saturated brine are required to produce one ton of salt. Because normal seepage losses range from 20 to 30 percent of the brines pumped, dilute brines increase pumping requirements more than the decrease in concentration of the brines would indicate. With a saturated Great Salt Lake brine, about 250 acres of harvest |