METHOD FOR TREATING PHOSPHORUS AND NITROGEN COMPRISED IN SEWAGE OR WASTEWATER USING IRON ORE WASTEWATER

摘要

PURPOSE: A method for treating phosphorus and nitrogen contained in sewage or wastewater using iron ore wastewater is provided to prevent water pollution by eliminating phosphorus and nitrogen contained in sewage or wastewater and using struvite crystals as byproducts. CONSTITUTION: Iron ore powder is applied to an acidic solution and is stirred for 1 to 3 hours at a temperature between 90 and 110 degrees Celsius in order to obtain iron ore leachate. The iron ore leachate is diluted using distilled water and is centrifuged. Insolubilized remaining powder is separated and discharged. The pH value of the iron ore leachate is adjusted into a range between 7.5 and 9, and the iron ore leachate is centrifuged to obtain supernatant containing iron hydroxide and magnesium ions. The supernatant is added to the mixed solution of phosphate aqueous solution and an ammonium salt aqueous solution. The pH value of the reacting solution is adjusted to a range between 7.5 and 9. A stirring process and a filtering process are implemented, and struvite crystals are eliminated.