Organic hazardous waste is heated to between the boiling point of water and the cracking temperature of hydrocarbons under anaerobic conditions. The light hydrocarbons and water are recovered by evaporation and condensation. The heavy hydrocarbons and inorganic matter will be in the form of slurry, which will be taken out from the separating tower. The solids and liquids will be re-separated, and the heavy hydrocarbons will be recovered.