الخلاصة:
The treatment of wastewater in wastewater treatment plants separates purified water from a secondary residue called sludge. These residues are rich in organic matter, nitrogen, phosphorus and trace elements. A healthy reuse of this sludge as fertilizer or in other areas requires good characterization. The objective of this doctoral thesis is the characterization of sewage sludge issues from some wastewater treatment plants in eastern Algeria. The first part was devoted to analyze and characterization of sewage sludge issues from three wastewater treatment plants of Batna, Jijel and Sétif, in order to study the reuse of those sludge as fertilizer. The second part of this thesis was focused on the evaluation of the influence of the calcination temperature on the composition of sludge as well as the determination of non-isothermal kinetic parameters, two sludge were chosen for this study, and those are from wastewater treatment plants of Sétif and Jijel. The results obtained during this study are promising for choosing a good way of recycling sludge according to their compositions in the appropriate fields such as agriculture or the construction materials industry.
