trickling filter

(redirected from Percolating filter)

trickling filter

[′trik·liŋ ‚fil·tər]
(civil engineering)
A bed of broken rock or other coarse aggregate onto which sewage or industrial waste is sprayed intermittently and allowed to trickle through, leaving organic matter on the surface of the rocks, where it is oxidized and removed by biological growths.
References in periodicals archive ?
Incorporating a specially developed hemocyte percolating filter, the tube can drastically reduce the time required for blood drawing and testing from 15-40 minutes to only 2 minutes.