Sewage Sludge Ash To Phosphate Fertilizer By Thermochemical Treatment

A rotary reactor and a fluidized bed reactor (both laboratory-scale and operated in batch mode) are used for the treatment of granulates containing SSA and CaCl ) and treating this mixture (possible after granulation) in a rotary kiln at 1000±100°C leads to the formation of volatile heavy metal compounds which evaporate and to Pphases with a high bio-availability. Due to economical and ecological reasons, it is necessary to improve this technology to reduce the energy consumption. As fluidized bed reactors are characterized by a high heat and mass transfer, the usage instead a rotary reactor promises the saving of thermal energy, the acceleration of removal processes and the material throughput.