Aerobic biofiltration under pressure

The pressurized biofilter is a biological water treatment device used in aquaculture to maintain optimal water quality, especially in Recirculating Aquaculture Systems (RAS). Unlike gravity-fed filters, it operates in a closed, pressurized loop, allowing for a compact, versatile, and high-efficiency installation.

How It Works

Water loaded with nitrogenous waste (mainly ammonia NH₃) is pushed under pressure through a filtering medium (e.g., plastic beads, ceramic media, or foam). Nitrifying bacteria colonize this media and carry out nitrification:

• Ammonia (NH₃/NH₄⁺) → Nitrites (NO₂⁻) (Nitrosomonas)

• Nitrites (NO₂⁻) → Nitrates (NO₃⁻) (Nitrobacter, Nitrospira)

Advantages

• Operates under pressure, ideal for closed-loop systems

• Suitable for compact installations

• Compatible with other filtration systems (UV, mechanical)

• Easy maintenance

• Excellent biological efficiency

Applications

• RAS (Recirculating Aquaculture Systems)

• Hatcheries, nurseries, fry rearing

• Aquaponics

• Public or professional aquariums

• Intensive fish farming tanks