NQA

Aeration & Oxygenation systems

Environmental & sustainable water treatment to save the planet

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Sizing an aeration system for aquaculture               Aeration homepage


Aquaculture system water temp below 20 degC 
number of diffusers  6.2.10 require per 10 tonnes (10,000kg) of stock		water temp above 20 degC
number of diffusers  6.2.10 require per 10 tonnes (10,000kg) of stock
 tank /cage systempond systemtank / cage systempond system
Salmonids / trout in tanks/raceways6486
salmonids in sea cages1 2 
Tilapia  1 2
Shrimps (monodon) 1 2
     
     
     

Diffuser codes 6.2.10,  requires an air flow of 10 cubm/hr of air and will deliver on average 500g to 1000 g per hour of  oxygen. In seawater systems, or if the salinity of the water is over 15 ppt, then  bubble size is smaller and oxygen transfer efficiency is higher.  The above table should be used as a guideline, if you would like a Dryden Aqua to access your requirements please provide as much information about your facility as possible.  

The air blower should be a 100% oil free positive displacement unit, such as a roots type blower operating at a maximum of 1 bar pressure. Actual operating pressure will be a function of hydrostatic heads. Typically the operating pressure is 0.5 bar and  and oxygen transfer is 5 kg of oxygen per  kilo-watt of energy expended. The Dryden Aqua fine bubble air diffusers generate a mass vertical movement of water, oxygen transfer therefore relates the diffusion through the bubble, but also transfer from the surface. With paddle wheel aerators or surface aerators, apart from the initial transfer of oxygen to the water,  there is little transfer  or vertical mixing of the water. For very large ponds, a combination of paddle wheel aerators for horizontal flow and fine bubble air diffusers for vertical mixing can prove very effective.
 
Efficiency & sizing of system

The efficiency of an aeration system is related to a number of key environmental parameters.  If you wish Dryden Aquaculture to determine your farms aeration requirements some basic information is required of your facility, please answer as many of the questions given below;

Provide a schematic plan of your farms showing tank spacing

Dimensions of tanks

Water depth

Species of fish/crustacean

Water flowrate through the tanks

Type of enclosure, e.g. earth pond/concrete/fibreglass

Maximum stocking density

Maximum size of the fish

Maximum water temperature

Details on water quality

Soft or hard freshwater, or sea-water

Source of water e.g., spring/borehole/river/lake

Detailed water analysis of water if available

Salinity of the water