| 摘要 |
<p>Apparatus for deodorising and neutralising pathogens in sewage sludge comprises an auger mixer 2 in which sludge from an infeed auger conveyor 8 is mixed with quicklime metered through metering auger 12 from silo 11. The sludge and quicklime are mixed in auger mixer 2 for one to two minutes to cause an exothermic reaction raising the temperature of the mixture to approximately 90{C and the pH of the mixture to approximately 12. Solid matter in the mixture is reduced (see Fig. 2, means 30) to a particle size not exceeding 5 cm., and is fed to a rotary dryer 3 where the temperature of the mixture is raised to approximately 400 {C by a heated air stream from fan burner unit 40. The mixture is tumbled in drum 32 for seven to ten minutes and treated material discharged onto output conveyor 50. Other types of waste material may be treated and other sources of calcium oxide may be used. A process using the apparatus is also claimed.</p> |
