trickling filter
noun
: an artificial bed of broken rock or other coarse material through which sewage or industrial wastes trickle after being sprayed on intermittently so that organic matter present is oxidized and removed by biological growths formed on the surfaces of the rock
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“Trickling filter.” Merriam-Webster.com Dictionary, Merriam-Webster, https://www.merriam-webster.com/dictionary/trickling%20filter. Accessed 30 Nov. 2024.
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