Composting apparatus with internal transport system

A composing system which includes a stationary and usually unheated generally horizontal composting chamber with an inlet and outlet at oposite ends of the chamber. Through the middle of the chamber may be a shaft or shafts to which are attached a series of discrete arms, appendages or flutes that extend into the outer volume of the chamber. The arms mix and agitate a composting material placed in the inlet and transport the compost material to the outlet at the other end of the chamber while the material composts and biodegrades in the chamber. The arms allow air to penetrate into the composting material and to release water through the emission of steam. A number of probes through the exterior of the chamber which extend into the headspace of the chamber, or into the copositing mix measure temperature and carbon dioxide levels with the chamber.