The author describes a pyrolysis project in New York State. A pyrolysis system was designed to process 75 TPD that can convert municipal solid waste into a clean, inert residue without causing air or water pollution. In order to test this, it is necessary to obtain economic, technical, and operational data to evaluate the system and provide a basis for assessing the potential of larger-scale operations. The project was set up in three phases: The primary objective of Phase I was to design, install, and operate those major subsystem components of the entire system necessary to demonstrate that the basic concept is a viable one and that an inert residue can be produced by converting the noncombustible portions of the refuse into a molten slag. Phase II involves the installation of the remaining equipment for the exhaust gas pollution control subsystems, startup and integration of the entire equipment system, and Phase II testing. The project is currently at this point. Phase III will involve gathering economic and technical data during sustained 24-hour operations.