Effect of incineration of sewage sludge on the evolution of physicochemical characterization and mineralogical properties

Recently,the protection of the environment through the ecological management of waste has become a major preoccupation of the modern societies. therefore,our study aims to present the physicochemical and mineralogical properties of sewage sludge calcined at temperatures between 105°c and 950°c by using the technics of the icp-aes method,x-ray diffraction,bernard calcimeter test and bartington ms2 dual frequency sensor. these parameters allow us to arrive at a clear determination of the composition in heavy metals and mineralogical,chemical elements such as calcium,sodium and potassium,the carbonate (caco3) and magnetic susceptibility of sewage sludge ashes in order to valorize the use of these ashes in the cement manufactories. the obtained results showed that sewage sludge ashes contain an important quantity of iron,magnesium,calcium,sodium,zinc,and potassium with a total destruction of organic matter,and the appearance of several mineralogical phases such as britholite,merrillite,and andradite. concerning the calcite,the values are around 20% and down to 8%. hence,decreased after incineration of sewage sludge at 550°c and 950°c,calcite decomposes into calcium oxide cao. the magnetic susceptibility increases with higher temperatures in accordance with the high content of oxides and metals.in general,the ranges of the magnetic susceptibility measured are around 0.02×10-5 to 0.88 ×10-5 si. © 2017,university of mohammed premier oujda morocco.