Fixed bed for biological wastewater treatment and process for inspecting the fixed bed

摘要

The invention relates to a fixed bed for biological wastewater treatment, with a fixed bed body (11) consisting of a plurality of packing blocks (29 to 32, 36 to 39), wherein a plurality of packing blocks arranged one above the other form packing columns (12 to 15) which are held by holding means (rods 24). are releasably anchored to the bottom (wall 17) of the fixed bed (10), and a plurality of packed columns (12 to 15) are arranged side by side and one behind the other. According to the invention, at least one packing block (36) or at least part of one of the packing columns can be lifted out of the fixed bed body (11) as a control column (33) for inspection purposes.