DE NORA TETRA® biofilters can be designed in a variety of configurations to achieve optimal treatment for biological oxidation of organic compounds, nitrification, and denitrification. The De Nora flagship biofilter with over 300 installations is DE NORA TETRA® Denite® system, which biologically reduces soluble nitrates to nitrogen gas in an anoxic environment. In addition to nitrogen removal, DE NORA TETRA® Denite® solution often employs physical/chemical processes to enhance performance by also removing phosphorus and solids in a single-stage process. Media selection is influenced by a DE NORA TETRA® DeepBedTM filtration concept that is especially advantageous for biological applications where reaction time, solids holding capacity, and biomass inventory control are critical to performance.
DE NORA TETRA® ColOXTM, SAFTM, and NSAFTM are aerobic biofilters used for BOD/COD oxidation and nitrification.