Trickling filter
TYPE OF WASTEWATER TREATMENT SYSTEM WITH A FIXED BED OF ROCKS OR SIMILAR
Trickle filter; Percolating filter; Biological filter filter; Biological trickling filters (Biofilters); Trickling filters; Aerated biofilters; Biological filter; Aerobic biofilter
A trickling filter is a type of wastewater treatment system. It consists of a fixed bed of rocks, coke, gravel, slag, polyurethane foam, sphagnum peat moss, ceramic, or plastic media over which sewage or other wastewater flows downward and causes a layer of microbial slime (biofilm) to grow, covering the bed of media.