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, SAF, and NSAFTM are aerobic biofilters used for BOD/COD oxidation and nitrification. DE NORA TETRA® ABF biologically active filters combine ozone and biological filtration to treat Contaminants of Emerging Concern (CECs).