Recently, the effluent standard of nitrogen and phosphorus was reexamined for the prevention of the eutrophication in Suwa Lake river-basin sewerage since 1995. The simultaneous phosphorus precipitation process has been introduced as a phosphorus elimination countermeasure. The phosphorus is surely removed by the flocculant, and it is finally removed as sludge and incinerated ash. However, phosphorus is rare resources. It is being estimated, when 10-15% phosphorus of phosphate rock imported as a fertilizer is included in the municipal wastewater. Therefore, it seems to be more important that it is recycled than disposing of the phosphorus in the sludge. With the basic experiment, it was confirmed that elution amount of aluminum of flocculant metal composition and phosphorus increased by treating the sludge of the simultaneous phosphorus precipitation process with alkali. It was confirmed that it could recover the phosphorus as hydroxylapatite, when calcium chloride is added to elution liquid, and can recycle elution aluminum as a flocculant. In addition, it was confirmed that it solubilized the sludge by the alkali treatment and can drastically reduce the sludge disposal cost.