| 摘要 |
PROBLEM TO BE SOLVED: To provide a compact laminated filter thigh in regeneration efficiency and easy to manufacture. SOLUTION: A plurality of ring-shaped filter elements 1, each of which has a large number of through-holes 6 having a hole size larger than the particle size of a suspended substance formed therein so that the hole axes of them is turned in the thickness direction of the filter element and has notches 5-1, 5-2 formed to the inner and outer peripheral end parts thereof, are laminated and an inflow part of a liquid to be treated is provided on the side of one of the inner and outer peripheral lamination surfaces of each filter element and an outflow part of the liquid to be treated is provided on the side of the other one for them. The filter elemets 1-1 have at least two kinds of non-circular ring shapes and are laminated so that the center positions of them are allowed to coincide with each other and the through-holes 6 are partially exposed to the inner and outer peripheral lamination surfaces of the filter elements other than the notches 5-1, 5-2.
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