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DE NORA TETRA® Biological Filtration
The robust design of DE NORA TETRA® biological filters creates an ideal environment for simultaneous biological filtration and physical/chemical treatment. Common applications include polishing municipal wastewater effluent to reuse standards and/or regulatory discharge limits. De Nora has over 50 years of experience removing nutrients, organic compounds, and solids in tertiary fixed-film biological filters. De Nora’s flagship biofilter with over 300 installations is the DE NORA TETRA Denite® system, which biologically reduces phosphorus and converts soluble nitrates to nitrogen gas in an anoxic environment. Existing De Nora media filters can be easily upgraded to biologically active mode as well.