METHOD OF REMOVING IRON FROM WATER Russian patent published in 1998 - IPC

FIELD: water treatment. SUBSTANCE: method consists in evacuating original underground water, mixing it with air, keeping water in contact with air, and filtration. More particularly, a part of water is withdrawn from contact tank and supplemented with air whose bubbles are dispersed to a specified size while simultaneously raising pressure, after which water is allowed to stand until it is saturated with amount of oxygen sufficient to oxidize iron and returned into contact tank. Combination of such saturation parameters as amount of supplied air, size of dispersed bubbles, value of elevated pressure, and its action time should satisfy following expression: where Q is amount of supplied air, cu.m per 1 cu.m of water; P elevated pressure of water- air mixture, Pa; R bubble size, m; H Henry constant, cu.m Pa/kg; D coefficient of molecular diffusion, sq. m/s; ΔC difference of oxygen pressures in water near bubble wall C_s= C_p(1+2σ)/R_oP_o and in water bulk C_L; C_p equilibrium concentration of oxygen in water; C_c= C_L(ω+1)-ωC_ω (ω = Q_w/Q_c) needed amount of water, kg per 1 cu.m of circulation water; Q_w underground water supply, cu.m/h; Q_c oxygen concentration in underground water, kg/cu.m. Method can be used for drinking or industrial water supply. EFFECT: optimized process parameters. 1 dwg