| 摘要 |
PROBLEM TO BE SOLVED: To facilitate the disposal treatment of used filter media and filters by using a chaff mat formed by finely crushing chaff, intimately mixing the chaff with a binder and compression molding the mixture as the filter medium in common use as the filter for a filter cylinder which is formed by laminating and loading the filter media via the filters therein. SOLUTION: The filter cylinder 1 of the filter device B which is purifying device of the waste liquid of the water culture device is constituted by integrally stacking a bottom filter cylinder 10, a lower cylindrical filter cylinder 11, an upper cylindrical part filter cylinder 12 and an upper filter cylinder 13 to connect to each other. Pebbles (f) are laid as the filter media in the bottom filter cylinder 10 and a supporting plate (k) consisting of a perforated plate, wire net, etc., is placed via a grid rail-like reinforcing material (j) thereon. The chaff mat which is formed by mixing the crushed chaff with the binder and molding the mixture by thermal compressing and is the filter medium in common use as the filter is laid atop the same. The pebbles (g) are then packed in the lower cylindrical filter cylinder 11 on the chaff mat and sand (h) is packed within the upper filter cylinder 12 in the upper part thereof, by which a filter layer is formed. |
