| 摘要 |
<p>1498360 Packing elements for trickle filters NORTON CO 20 May 1976 [21 May 1975] 20875/76 Heading CIC [Also in Division B1] Plastic packing elements for use in gas liquid contact apparatus, in particular biological trickle filters, comprise an outer wall of tubular shape extending around the central axis of the element, an inner tubular wall around the central axis and an intermediate tubular wall situated between and connected to the outer and inner walls, at least two of the walls being inclined at an angle to the central axis. The elements also preferably have radial ribs and perforations or apertures in the walls.</p> |
