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trickling filter
ecol. biosuodin; biosuodatin
environ. biologinen suodatin
trickling filter A system of secondary sewage treatment which is similar to self-purification action of streams; it is more accurately a biological oxidizing bed; the effluent is placed on the stones in the bed and microorganisms present consume the solids as a food supply
environ. biologinen suodatin
 English thesaurus
Trickling Filter
abbr., mil., WMD TF