| 主权项 |
1. Carrier element for an aerobic biological water treatment system, the carrier element having—a first end and a second end at a distance from each other, the length of the carrier element, measured from the first end to the second end, being 11.0-14.9 mm, the maximum diameter of the first end being larger than the maximum diameter of the second end,
growing surface structures, configured to support the growth of a biofilm, which are internal walls that extend from the first end to the second end and from inner part of the element towards periphery of the element, wherein at least one of said internal walls is triangular shaped, and at least one of said internal walls is quadrangular shaped, the triangular shaped wall having a side at the second end, and a vertex at its first end, a solid longitudinal central axis to which the internal walls are attached, and,—at least two support structures that encircle the growing surface structures at the periphery of the element and connect the growing surface structures to each other, the support structures defining the outer boundary surface of the carrier element, whereby the support structures are spaced from each other so that apertures allowing access to the biofilm growing surface structures are formed only between the support structures and the internal walls, the density of the carrier element being 0.92-0.99 kg/dm3. |
