Granular material for the treatment of effluent.

摘要

A method for treating phosphate-containing waste water comprising treating phosphate-containing waste water with a metal hydroxide complex as a phosphate adsorbent represented by formula (1) :        M_1-x²⁺M_x³⁺(OH^-)_2+x-y(A^n-)_y/n     (1)wherein M²⁺ represents at least one divalent metal ion selected from the group consisting of Mg²⁺, Ni²⁺, Zn²⁺, Fe²⁺, Ca²⁺ and Cu²⁺, M³⁺ represents at least one trivalent metal ion selected from the group consisting of Al³⁺ and Fe³⁺, A^n- represents n-valent anion, 0.1≤x≤0.5, 0.1≤y≤0.5 and n is 1 or 2 to adsorb phosphate is provided.