Waste steam from the drying operation contains odours and soluble nitrogen (BOD and COD). Waste steam at 100 deg.C. is conducted to the Teinenpi deodorant furnace, in which, through the direct burning system at more than 650 deg.C., the elements of odor and BOD/COD are completely broken down within 0.3 seconds. The principal feature of the Okadora Teinenpi Apparatus is the full recovery of waste heat in three stages. Firstly, radiated heat from the reaction temperature is recovered; secondly, radiant heat from the reaction itself; thirdly, indirect heat is recovered from waste heat. Through these stages, the temperature of the waste gases is increased to 500~550 deg.C. from the reaction chamber. This heat recovery process means that fuel is required only for heating up to 100~150 deg.C., instead of having to use fuel to heat up to 650 deg.C. Through the Teinenpi process, the elements of odor are broken down completely, as well as the BOD and COD, and the waste gases are emitted into the atmosphere as non-pollutant steam.