Patent ID: 6623642
Filing Date: 2003-09-23
Classification: C02F,Y10S

Abstract:
Procedure for treating wastewater containing dissolved ammonium and dissolved phosphate, including:procuring oxidation of the ammonium to nitrate, to such a complete extent that the pH of the water falls to 5.5 or less; excluding buffer-substances from the water, and preventing buffer-substances from entering the water, being substances which would prevent the pH of the water going down to 5.5 or less; providing a body of a treatment material, and passing therethrough the water in which the pH has fallen to 5.5 or less; wherein the treatment material is solid in form, and the body of treatment material is porous and permeable to the passage of waste therethrough; the treatment material comprises or includes aluminum hydroxide; whereby the phosphate precipitates, as aluminum phosphate, onto the body of treatment material; and then discharging the wastewater that has passed through the body of treatment material.