PYROLYSIS

The technology of pyrolysis is a form of incineration that chemically decomposes organic materials by heat in the absence of oxygen. Pyrolysis typically occurs under pressure and at operating temperatures above 430°C (800°F). In practice, it is not possible to achieve a completely oxygen-free atmosphere. Because some oxygen is present in any pyrolysis system, a small amount of oxidation occurs. If volatile or semivolatile materials are present in the waste, thermal desorption takes place.

During pyrolysis organic matter is transformed into gases, small quantities of liquid, and a solid residue containing carbon and ash. Off-gases are generally treated in a secondary thermal oxidation unit. Particulate removal equipment such as electrostatic precipitators is also employed.