NQA

Aeration & Oxygenation systems

Environmental & sustainable water treatment to save the planet

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Dryden Aqua fine bubble Air Diffusers

Aeration efficiency

Aeration index

 

One 3m long diffusers code 6.2.10 will pass 10 cubm/hr of air and will dissolve into the water 1 kg of oxygen per hour when the oxygen tension is around 2mg/l at a depth of 4 to 6m. As the oxygen tension drops below 2mg/l the transfer coefficient increases exponentially and an absolute maximum of 2 kg of oxygen per hour may be dissolved into the water from one diffusers and 10 cubm/hr of air.  For normal operating a design purposes base the size of the aeration system on 1 kg of oxygen per diffusers code 6.2.10 and 10 cubm/hr of air.  Maximum diffusers efficiency equates with approx 5 kg of oxygen per kw of energy expended

 

Typical Oxygen Transfer Efficiencies at Different water depths against the partial pressure of oxygen in solution

% oxygen saturation  1m depth2m depth3m depth4m depth6m depth30m depth
5%20%35%50%65%73%80%
10%15%20%40%55%65%75%
20%10%18%28%45%60%70%
30%8%15%20%30%50%65%
40%6%12%14%23%35%55%
60%4%7%8%15%20%45%
80%2%5%7%9%12%30%

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