Recirculating Aquaculture Systems - RAS

Ex-Situ Packed Bed Bioreactor (PBBR)

Ex-Situ Packed Bed Bioreactor (PBBR) The reactor is made of fiberglass shells. Each reactor has 9 aeration cells with beads. The beads are designed in such a manner that the specific nitrifying bacterial consortium gets immobilized on the surface of the beads. The Packed Bed Bioreactor contains 60 kgs of beads with a surface area of about 28.26 m² and specific surface area of about 205 m² / m³ to facilitate removal of harmful nitrogenous compounds.A reservoir tank and a collecting tank are integrated for facilitating flow of water from the former to the latter.

The Ex-Situ Packed Bed Bioreactor (PBBR) serves the purpose of reuse and recycling of spent water for larval production and for the treatment of fresh seawater taken into the hatcheries. This is a key component for the establishment of Recirculating Aquaculture Systems (RAS)


  • Establishment of Recirculating Aquaculture Systems (RAS) for maturation and brood stock maintenance.
  • Establishment of Recirculating Aquaculture Systems (RAS) for larval production.
  • Nitrification of the incoming water.
  • Spent water treatment and reuse.

Ex-Situ Packed Bed Bioreactor (PBBR) - Parts

Nitrifying bioreactors can be used for establishment of Recirculating Aquaculture Systems (RAS) in any marine water / brackish water / fresh water seed production systems including those of Prawn, Shrimp, finfishes, mollusks etc., and also in ornamental fish culture systems.

Biological Specifications

Temperature Tropical conditions-needs no heating and chilling
cold condition-needs heating and chilling
Total surface area of media 28.26 m²
Flow rate 300-2500litres/hr
Peak TAN removal rate 132g TAN/m³/day
Level of Dissolved Oxygen 5.8 – 6.0 ppm
Nitrate Level <8ppm
Backwash Depends on load
Durability Continuousrecirculationkeeps the system viable with sufficient aeration and ammonia loading

Ex-Situ Packed Bed Bioreactor (PBBR) - Outline

Technical Specifications

Water Salinity Range 0,15, & 30 ppt (+/- 5 ppt)
Three different cultures are available for the above mentioned salinity levels
Purification Capacity 10000 -60000 lts / day
Water Input 0.5 hp /230 volts Monoblock Pump
Water Drain system 7 Individual gate valves
Air Supply Air compressor (not with standard machine)
Power Supply 230 V ac 1N-50/60 HZ 2.5A f.l.c(fully load current)
Machine Structure MS fabricated body with Protective coating (As per International standards)
Process tanks Food grade FRP
Aeration tubes & knob Food grade tubes & Corrosion free pipes, Knobs
Overall dimensions 4.3Lx1.2Wx2H (Meters)
Why Recirculating Aquaculture Systems

Aquaculture hatcheries currently use the open larval rearing system. The open larval rearing systems have been found to have certain shortcomings. These are illustrated in the figure below and explained subsequently.

In an open larval rearing system in a hatchery, there is continuous exchange of seawater on a regular basis. The quantum of exchange varies depending on the hatchery and could be as high as 100%. Due to the heavy demand of seawater in the production...


Recirculating Aquaculture Systems (RAS)

Recirculating aquaculture systems, or RAS, are closed-loop production systems that continuously filter and recycle water, enabling large-scale fish farming that requires a small amount of water and releases little or no pollution.

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