Patent ID: 6348154
Filing Date: 2002-02-19
Classification: B01D,C02F

Abstract:
A method for efficiently and effectively removing metals from metal-containing water having at least one metal selected from the group consisting of aluminum, cadmium, chromium, copper, gold, iron, lead, nickel, manganese, selenium, silver and zinc comprising:adjusting the pH of the metal-containing water to form metal-containing precipitates thereby removing at least about 95% of the metals and forming an intermediate metal-containing water stream; subjecting the intermediate metal-containing water stream, said stream being at a temperature from approximately 5Â° C. to 190Â° C., to filtration with an inorganic cross-flow filter having an average pore size between from about 0.05 &mgr;m to 10 &mgr;m to remove additional metals and to form purified water; and periodically subjecting said inorganic cross-flow filter to a pulse of water at a pressure of approximately 80 to 100 psi in a direction so as to dislodge metal buildup in said inorganic cross-flow filter thereby maintaining the flow of purified water through the filter, said dislodging of metal buildup being conducted without interrupting the removal of metals from said intermediate metal-containing water stream by the filter.