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pp.211-217
Incinerated sewage sludge ash (ISSA) is regarded as a valuable resource having great potential for the recycling ofphosphorus. The P content of ISSA is known as around 10% as a P. Therefore, this study was undertaken to investigatethe precipitation and separation characteristics of phosphorus from the acid-extracted solution of ISSA. The incineratedsewage sludge ash was leached by 1N sulfuric acid with solid/liquid ratio of 10 for 30min. The extracted solutioncontained about 1.1% of P and other metals, Al, Fe, Ca and Mg, with over than 1,000mg/L. Some heavy metals suchas Cu, Pb and Cr are presented as impurities as well. Most of Al and Fe in the extracted solution were precipitated withP when titrating it to pH 3.6. The precipitated form were assumed to AlPO4, FePO4·2H2O respectively, and Pb and Crwere precipitated in this stage as well. At this experiment, about 62.9% of the initial P was precipitated and removedfrom the solution. It was also find that all of the P extracted can not be recovered as a precipitate with a simple additionof NaOH, even though titrated to pH 11.6. The precipitated P also contained some impurities such as Al, Fe, and someheavy metals, which means that further researches are needed for the efficient separation and recovery of P from ISSA.
