초록 ▼

Water, such as the effluent from cooling towers, boilers, waste streams of industrial plants, hydrometallurgical processes or other sources of water solutions containing sparingly soluble solids is efficiently separated into its aqueous and solid constituents by reverse osmosis and chemical treatmen

Water, such as the effluent from cooling towers, boilers, waste streams of industrial plants, hydrometallurgical processes or other sources of water solutions containing sparingly soluble solids is efficiently separated into its aqueous and solid constituents by reverse osmosis and chemical treatments effective to achieve a zero discharge of effluent and a minimum volume of sludge or a recovery of valuable solids.

대표청구항 ▼

The method of recovering liquid and solid constituents of water solution containing sparingly soluble solids which comprises: adjusting the temperature of the water solution within a temperature range of about 60°to 95°F., adjusting the pH of the solution within the range of about 7 to 8, filtering

The method of recovering liquid and solid constituents of water solution containing sparingly soluble solids which comprises: adjusting the temperature of the water solution within a temperature range of about 60°to 95°F., adjusting the pH of the solution within the range of about 7 to 8, filtering the thus adjusted solution, reducing the pH of the filtered solution within the range of about 5 to 5.5, reacting the solution with a polyphosphonate to increase the solubility of the solids in the solution, pumping the reacted solution through a reverse osmosis unit to separate the solution into a permeate and a brine containing the dissolved solids, decarbonating the permeate from said unit to produce purified water, adjusting the pH of the brine from said unit to about 7, subjecting the adjusted brine to the following reactions: 1. X2(Y)3+3Z(HCO3)2→3ZY+2X(OH)3+6CO2 2. X(HCO3)2+Z(OH)2→2ZCO3+2H2O wherein: X is a trivalent cation such as boron, aluminum, scansium, reduced titanium, chromium, manganese, oxidized iron, oxidized cobalt, oxidized nickel, gallium, arsenic, yttrium, reduced niobium, reduced molybdenum, rhodium, indium, reduced antimony, lanthanum, iridium, gold, oxidized thallium, reduced bismuth or the rare earths, Y is a divalent anion such as sulfate, molybdate, phosphate, chromate, mangnate, arsenate, borate, fluorosilicate, germanate, nitrite, oxalate, sulfite, tellurite, thiosulfate, tungstate or uranate, Z is a divalent cation such as beryllium, magnesium, calcium, reduced vanadium, reduced chromium, reduced manganese, reduced iron, reduced cobalt, reduced nickel, copper, zinc, strontium, palladium, cadmium, barium, reduced platinum, oxidized mercury, lead, polonium, or radium, separating the liquid and solid products of said reactions, and recycling the separated liquid to the water solution for further recovery therewith.