Wet oxidation is a newer technique for disposal of sludge wastes from sewage or industrial treatment by air oxidation under pressure. The rates of oxidation of several solid organic compounds were studied over a range of conditions. Experiments were conducted in a versatile reactor system, which would be operated as a batch, semi-batch or flow reactor. The solid reactants, in the form of cylindrical discs, were attached to the shaft of a variable speed drive. With a rotating disc geometry, the kinetics of the surface reaction can be separated from mass transfer effects. The wet oxidation of several solid plastics was explored with the rotating disc reactor. In particular, nylon 66 was oxidized over a range of temperatures, pressures, and disc rotational speeds.