Coprocessing of sewage sludge in cement kiln

Abstract The basic aim of efficient sewage sludge management is to use technologies that ensure maximal utilization of the potential of raw material resources and energy. This chapter presents the analysis of specific properties of sewage sludge, allowing for its use in the process of cocombustion in cement kilns. Due to its energy properties, sewage sludge represents a valuable alternative compared to conventional fuels. Substitution of conventional fuels with alternative fuels results in a substantial reduction in the fuel emissions of carbon dioxide. Furthermore, with its chemical composition, sewage sludge represents a potential source of raw materials for clinker production, thus limiting the demand for natural fossil fuels. As results show from previous studies in this area, specific conditions of incineration in cement kilns allow for maintaining emission standards and process requirements for the production of clinker. This method of sewage sludge utilization allows for reaching integrated environmental benefits through a more effective and environmentally friendly treatment combined with protection of natural resources, which is consistent with the principles of sustainable development and introduction of closed matter circulation.