To separate the granule free from a pollutant and large in particle size while adding water from the granule subjected to granulating treatment and to which the pollutant is stuck.
In the treating method, the water to be treated and containing the granule to which a pollutant is stuck is classified by using a liq. cyclone 51 after temporarily storing the water to be treated in a feed sump 40. Moreover, the treated water discharged from the upper part of the liq. cyclone 51 and containing the granule low in particle size and the treated water obtained by separating the granule large in particle size from the soil water containing the granule separated at the liq. cyclone 51 and large in particle size by a dehydrating vibrating screen 53 are returned again to the feed sump 40.
ITO HIROSHI
SHINODA YUTAKA
KUMAGAI GUMI CO LTD
SHINROKU SEIKI KK
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