Supplier Knowledge · Biofilter Suppliers
Biofilter Suppliers for RAS — Buyer's Knowledge Page
The biofilter is the nitrifying heart of a RAS. Under-size it and biology destabilises; over-size it and CAPEX and pumping energy skyrocket. Buyer's job: define TAN removal rate needed (from mass-balance) and let vendors propose media and geometry.
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Typical applications
- Fresh, brackish and full-salinity RAS
- Nursery, grow-out, broodstock loops
- Post-smolt salmon and marine finfish
Project sizes
- Small: 10–50 kg TAN/day removal
- Mid: 50–500 kg TAN/day
- Large: 500–5,000+ kg TAN/day
Selection criteria
- Guaranteed volumetric TAN removal at your temperature and salinity
- Media specific surface area (m²/m³) and clogging behaviour
- Hydraulic residence time and back-mixing
- Head loss and pumping energy
- Start-up curve and inoculation protocol
Questions buyers should ask
- What is guaranteed VTR (g TAN / m³ media / day) at 15°C / 20°C / 25°C?
- What is the biofilter's contribution to total specific energy?
- How is media replaced and how often?
Common procurement mistakes
- Trusting media catalog VTR without temperature correction
- Ignoring salinity effects on nitrification kinetics
- Under-sizing degassing after the biofilter
RFQ recommendations
- Tender against a required TAN removal load, not a media type
- Ask for kinetic model and CFD if project is large
Related tools & guides
Calculators
Buyer's Guides
Project templates
Regulations & standards
Frequently asked questions
Next steps
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