The Denitrifying Deep Bed Filter (DDBF™) is a wastewater treatment process of the Poseidon Filtration System®. It provides fixed‑film biological denitrification in a downflow filter configuration. With proper chemical treatment, the DDBF™ is capable of meeting stringent effluent limits of total nitrogen as low as 3 mg/l, total suspended solids to 2 mg/L, and total phosphorus to 0.3 mg/L or less.
How it works
In the DDBF™, denitrifying organisms attach to the filter media. Supplemental carbon is augmented to the filter influent to drive the denitrification process. Wastewater flows around nitrogen gas bubbles that accumulate in the media and reduce the space between sand grains, which improves biomass contact and filtration efficiency.
Orthos’ Centurion™ structurally-superior filter underdrains feature nozzles with solid-expelling slots, specifically‑sized to retain the DDBF™ media and prevent biological fouling. No gravel layer is necessary, which reduces hydraulic profile and eliminates related horizontal short‑circuiting.\
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