Title:
FILTRATION PROCESSING METHOD
Document Type and Number:
Japanese Patent JP2023031356
Kind Code:
A
Abstract:
To provide a filtration processing method that can form a filter material layer suitable for deep layer filtration by consolidating a settleable granular fiber filter material supplied into a filtration tank on a front stage of a filtration processing process.SOLUTION: In a filtration processing method that consolidates a settleable granular fiber filter material 3 on a front stage of a filtration processing process S1, the filtration processing process S1 is started after a return prevention process S3 in which a return prevention member 11 having a buoyancy adjustment mechanism 17 and an air reservoir 18 is so made as to stand on a surface layer of a filter material layer 5 and consolidation of the filter material layer 5 is maintained, and a consolidation process S4 in which consolidation water accumulated in a filtration tank 2 is drained from a bottom and a fiber filter material 3 is compressed to form the filter material layer 5 are performed. Before the filter material layer 5 is compressed by water flow in the consolidation process S4 and is expanded to an upper open surface due to a repulsive force thereof, the return prevention member 11 is so made as to stand on the surface layer of the filter material layer 5, whereby expansion of the filter material layer 5 can be suppressed.SELECTED DRAWING: Figure 1
Inventors:
TOMIZAWA KIMITAKA
KATAYAMA MASAYOSHI
UJIIE HIDETAKA
NISHIYAMA YU
KATAYAMA MASAYOSHI
UJIIE HIDETAKA
NISHIYAMA YU
Application Number:
JP2021136793A
Publication Date:
March 09, 2023
Filing Date:
August 25, 2021
Export Citation:
Assignee:
ISHIGAKI CO LTD
International Classes:
B01D24/00
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