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Comparison between Three Secondary Effluents in Tertiary High Rate Filtration

Blanca Elena Jiménez, Germán Buitrón

Abstract

The study of filtration of three secondary effluents (activated sludge, rotating biological contactor, and trickling filter) is presented. It was found that filter effluent does not exceed, in average, 3 NTU for all the conditions studied. Activated sludge effluent has longer runs (6 to 27 h) than trickling filter (4 to 9 h) and rotating biological contactor (1 to 5.5 h). Best removals were achieved when treating trickling filter effluent (64%) compared to rotating biological contactor (51%) and activated sludge (55%). In all cases, the end of the run was caused by head loss rather than turbidity. Results showed that the behavior of each effluent varies widely under the same filtration and backwashing conditions and support the need for more experimental work to be conducted.

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Key concepts: Trickling filter, Effluent, Backwashing, Rotating biological contactor, Filtration (mathematics), Activated sludge, Turbidity, Filter (signal processing)