| 摘要 |
<p>PURPOSE:To enhance decomposition ability of biological filtration, to decompose a solid org. matter, and ammonia, etc., and to eliminate the need for washing for a long time by combining the first and the second structural filter material respectively having a fine void and a coarse void to form a filter material and forming projecting parts continuously on at least one surface of the second structural filter material. CONSTITUTION:The first structural filter material 1 having the fine void and the second structural filter material 2 having the coarse void are combined, and projecting parts 3 are formed continuously on at least one surface of the second structural filter material 2 to easily capture the solid, and the projecting parts 3 are arranged regularly so that a water stream is affected more complicatedly by the projecting parts 3, and positions are sifted by half of every one in every line. The first and the second structural filter materials 1 and 2 are made of water-resistant filamental material, for example, the synthetic resin such as polyethylene and polypropylene and a synthetic rubber or the inorganic matter such as a glass fiber welded or bonded partially in an up-and-down direction, a diagonal direction and vertical and horizontal directions to form numerous voids having uneven shapes.</p> |
