The advantages of treatment of hazardous waste in cement kiln can be summarised as follows :

• High flame temperature (1,800 - 2,000°C)
• 5 to 6 seconds of residence time above 1,200°C
• Excess of oxygen during and after combustion
• Complete destruction of organic compounds
• Total neutralisation of acid gases, sulphur oxides and hydrogen chloride, by the active lime in the kiln load, in large excess to the stoechiometry
• Embedding of the traces of heavy metals in the clinker structure with very stable links (metallic silicates formation)
• No production of by-products such as ash or liquid residue from gas cleaning
• Total recovery of energy and mineral content of waste (raw material and fossil fuel saving)