| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method for treating organic sludge for sufficiently drying organic sludge with a small amount of unslaked lime, and obtaining dried sludge having a low calcium content. <P>SOLUTION: The method for treating organic sludge includes: a dehydration step of dehydrating organic sludge so as to obtain dehydrated sludge; a primary drying step of charging the obtained dehydrated sludge and unslaked lime into a rotary kiln 2, evaporating water in the dehydrated sludge by reaction heat between the water in the dehydrated sludge and the slaked lime, further recovering the produced water vapor from the rotary kiln 2, superheating the same by a vapor superheating device 3, feeding the obtained superheated water vapor to the rotary kiln 2 and bringing the superheated water vapor into contact with the dehydrated sludge and the unslaked lime; and a secondary drying step of taking out the sludge subjected to the primary drying step from the rotary kiln 2 and drying the same. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
