Abstract
Preparation of calcium phosphate from phosphate in solution from sewage incinerated ash by acid extract was investigated. We focus iron and aluminum ions that need to remove for phosphate recovery, and attempted utilize its. We investigated effect of aluminum gels on phosphate recovery from aluminum containing phosphate solution, and effect of iron ion on phosphate recovery. Recovery efficiency of phosphate in simulated solution was improved by using aluminum gels. By using this method, 90 % of phosphate in extract from sewage incinerated ash and carbonized sewage sludge were recovered. From these results, preparation of calcium phosphate by using aluminum gels is applicable to recover unused phosphate in acid extract from sewage sledges.
