Introduction to Recirculating Aeration System - AirOxi Tube

IntroductIon to recIrculatIng aeratIon SyStem (raS)

What is Recirculation Aeration System (RAS) Recirculating aquaculture systems (RAS) are used in home aquaria and for fish production where water exchange is limited and the use of bio filtration is required to reduce ammonia toxicity.

Benefit of RAS • Ability to reduce the need of fresh water.

• Ability to reduce the need of clean water.

• Maintaining healthy environment for fish.

RAS Process Biofilteration

Solids removal

pH Control

Oxygenation

Biosecurity

Biofilteration

1 All RAS relies on biofiltration to convert ammonia (NH4+ and NH3) excreted by the fish into nitrate.

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A biofilter provides a substrate for the bacterial community, which results in thick biofilm growing within the filter. Water is pumped through the filter, and ammonia is utilized by the bacteria for energy.

Stable environmental conditions and regular maintenance are required to ensure the biofilter is operating efficiently.

Solid Removal

1 In addition to treating the liquid waste excreted by fish the solid waste must also be treated, this is done by concentrating and flushing the solids out of the system. Removing solids reduces bacteria growth, oxygen demand, and the proliferation of disease.

2 Typical RAS solids removal involves a sand filter or particle filter where solids become lodged and can be periodically back flushed out of the filter.

Oxygenation

1 Reoxygenating the system water is a crucial part to obtaining high production densities.

2 Fish require oxygen to metabolize food and grow, as do bacteria communities in the biofilter. Dissolved oxygen levels can be increased through two methods aeration and oxyg enation.

3 Airoxi Tube provides tube which help RAS to run efficiently and increase oxygen.

pH Control

1 In all RAS pHmust be carefully monitored and controlled. The first step of nitrification in the biofilter consumes alkalinity and lowers the pH of the system.

2 Keeping the pH in a suitable range (5.0-9.0 for freshwater systems) is crucial to maintain the health of both the fish and biofilter.

Biosecurity

1 Disease outbreaks occur more readily when dealing with the high fish stocking densities typically employed in intensive RAS.

2 Outbreaks can be reduced by operating multiple independent systems with the same building and isolating water to water contact between systems by cleaning equipment and personnel that move between systems.

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