Agent for removing phosphates, nitrates and nitrites from wastewater

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 the formula: PPM. sub.1-x.sup. 2+ M.sub.x.sup.3+ (OH.sup.-).sub.2+x-y (A. sup.n-).sub.y/n PPwherein M. sup.2+ is at least one divalent metal ion selected from the group consisting of Mg.sup.2+, Ni. sup.2+, Zn.sup.2+, Fe. sup.2+, Ca.sup.2+ and Cu.sup.2+ ; M.sup.3+ is at least one divalent metal ion selected from the group consisting of Al.sup. 3+ and Fe.sup.3+ ; A.sup. n- is an n- valent anion; x is in the range 0. 1≦x≦0.5; y is in the range 0.1≦y≦0.5; and n is 1 or 2.