Conversion of Aluminum Phosphate to Sodium Phosphate

Abstract

Abstract:The phosphorus recovered from sewage sludge by acidic treatment is mainly composed of aluminum phosphate. To make a wide utilization of recovered phosphorus, removal of the aluminum component is considered a very important matter. In order to find a method to convert aluminum phosphate to sodium phosphate, a basic investigation was carried out. A reagent of aluminum phosphate was dissolved by aqueous solution of sodium hydroxide, and mixed with sodium silicate to make a alunino-silicate gel. Sodium phosphate was recovered from residue water in the gel.