| abstract |
PROBLEM TO BE SOLVED: To properly treat sludge having appropriate moisture so as to contain heavy metals well and to efficiently insolubilize and solidify those heavy metal contaminated soils. SOLUTION: The fine particle having a particle size of less than 0.5 mm after washing and classifying processing containing heavy metal, adjusted to moisture suitable for granulation by a sludge quantitative supply device 7, is supplied to a solidifying material. The solidified material is supplied to the continuous mixing granulator 11 by 8 at a constant rate to produce a primary granulated product. The primary granulated material is supplied from the continuous mixing granulator 11 and the insolubilized material is supplied from the constant amount feeder 15 for the insolubilizing material to the continuous agitation granulator 13, respectively, and the primary granulated material is mixed, granulated and compacted. A next granulated material is produced, the surface of the secondary granulated material is coated with an insolubilizing material, and continuously discharged from the upper part of the stirring tank 13a. [Selection] Figure 2 |