An environmental and technical evaluation was conducted on the Western Lake Superior Sanitary District waste treatment plant, which uses wood chips to incinerate sewage sludge in fluidized-bed combustors. The most important environmental factors for evaluation were determined to be the metal contents of the particulate stack emissions and of various influent and effluent streams to the combustor scrubber system. The technical evaluation used data collected over the life of the facility to develop a mathematical model of the incineration and energy recovery system. The model was coded in the form of a computer program and can rapidly evaluate a wide variety of possible situations in which such an energy recovery approach might be taken. Thus, the technical evaluation is presented in a widely usable and understandable form.