Evidence of formation of AlPO4 tridymite in some municipal sewage sludge ashes

Sewage sludge ashes (SSAs) are valuable raw materials (high P-content of up to 11 wt%; ca. 600,000 tons per year in the EU). For the conversion of sewage sludge into SSA fluidized bed incinerators are used. The aim of the present study is to test whether that finding is also relevant for a considerably different SSA, which was produced at a differently operated fluidized bed incineration facility in another municipality.