FIELD: chemistry.
SUBSTANCE: working element for loading a biofilter has a corrugated sheet 1, having slits 2 lying in groups 3 across the sheet 1, and the direction of the slits 2 coincides with the longitudinal direction of the sheet 1. In each group 3 of slits in parts of the sheet 1 lying between two neighbouring slits there are corrugations of different height. The face of each corrugation is mated with a ridge which lies in approximately the same plane for each group of corrugations. The part of the sheet 7 between two neighbouring groups of corrugations does not have slits. The slits can also be paired on the faces of the corrugations of the sheet or on two neighbouring faces, wherein parts of corrugations lying between paired slits are depressed relative the faces.
EFFECT: high efficiency of biochemical treatment of waste water, low material consumption and high total surface area without increase in weight.
7 cl, 14 dwg, 1 ex
