- (B) Sewage is spread onto the surface of a trickling filter (oxidizing) bed, a
deep bed made up of coal or limestone chips. The distributed sewage
“liquor” trickles through the bed and is collected in drains at the base. These
drains also provide a source of air, which percolates up through the bed,
keeping it aerobic. Bacteria, protozoa, and fungi form on the media’s
surfaces and consume and reduce the organic content.
marvins-underground-k-12
(Marvins-Underground-K-12)
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