| 摘要 |
PURPOSE:To dry efficiently high water-content dehydrated cake by utilizing the heat retained by the discharged from an aeration blower for supplying air into an aeration vessel wherein organic sewage and sludge are treated, for the finish drying of the cake, and heating the discharged air which is utilized for the predrying of the cake. CONSTITUTION:The dehydrated cake 1 of organic sludge having about 70-80% water content is supplied into a predryer 2, for example, an agitation-granulation dryer, dried by the hot air 3 while being agitated and graulated, and converted into a granular predried material 4 having about 40-65% water content. The predried material 4 is subsequently supplied into a hermetic finish dryer 5 wherein a packed bed 6 is formed. The air 9 discharged from an aeration blower 8 fro supply aeration air into an aeration vessel 7 in the treating system of organic sewage, organic sludge, etc. is passed through said packed bed 6, and the predried material 4 forming the packed bed 6 is dried to obtain a material 10 having <40% water content (normally 20-30%).
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