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biologinen suodatin
ecol.	bacterial bed; biological filter; percolating filter
environ.	trickling filter; biofilter; 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; bacterial bed A device that removes some suspended solids from sewage. Air and bacteria decompose additional wastes filtering through the sand so that cleaner water drains from the bed