The establishment of recent laws regarding wastewater treatment has made the treatment of sewage sludge in incineration processes even more complex. In an attempt to follow this new environmental legislation, SIAAP optimizes its wastewater treatment by using a bubbling fluidized-bed incinerator technique. Its PID control system does not ensure an appropriate operation of incineration due to the complexity of the incinerator structure, what can lead the system into a dangerous behavior. Thus, a predictive control system is required in order to foresee any deviation from incineration behavior. The predictive control allows the incineration system to prevent itself from risky situations by acting in advance. This paper describes a preliminary methodology to obtain a predictive-control numerical corrector. This corrector forecasts the future outputs of a PID-controlled incineration model via Matlab/Simulink simulations and operates the system closed-loop feedback so as to avoid system instabilities.