Aeration & Oxygenation systems
Environmental & sustainable water treatment |
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Dryden Aqua fine bubble Air Diffusers.... Aeration efficiency
1 x diffuser code 6.2.10, 3m long 10 cubm/hr will support 100PE population equivalent is sewage effluent treatment
1 x diffusers code 6.2.10, 3m long running at 10 cubm/hr will dissolved into the water between 20kg and 50 kg of oxygen per day
Transfer efficiency, for 1 kw of energy expended 2kg to 5 kg of oxygen will be dissolved into the water
The Dryden Aqua diffusers are usually twice as efficient as any other diffuser on the market and up to 4 times more efficient than surface aerators that can waste a huger amount of energy as kinetic energy simply throwing the water up into the air.
Typical Oxygen Transfer Efficiencies at Different water depths against the partial pressure of oxygen in solution
| % oxygen saturation | 1m depth | 2m depth | 3m depth | 4m depth | 6m depth | 30m 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% |
Table Relationship between Ammonium, BOD, Phosphate and alkalinity
Dryden Aqua Advantage
Dryden Aqua air diffusers do not need to be secured to the base of the lagoon or aeration tank, the air ring main goes around the perimeter of the tank, 1/2" hose connects the air ring main to the diffusers, and the diffusers are simply dropped in to the tank. The Dryden diffusers are a very fine bubble diffuser with low pressure drop which makes them the most efficient diffuser available for water treatment and mixing application. However the diffusers do need to be cleaned for time to time to maintain the performance, but this is very easy to accomplish. Cleaning, just pull the 1/2" hose to lift the diffuser out of the water, give it a quick brush or pressure wash and then drop back into the tank. Cleaning takes about 2 minutes per diffuser, you do not need to turn off the air blower and you do not need to empty the tank.
Kg of component required | Ammonium nitrogen 1kg | COD/BOD 1 kg | Phosphate 1kg |
| Oxygen required = | 5 Kg | 2 Kg | *** |
| Ammonium nitrogen consumed = | *** | 0.1 Kg | 10 Kg |
| COD/BOD consumed = | 10 Kg | *** | 100 Kg |
| Phosphate required = | 0.1 Kg | 0.01 Kg | *** |
| Alkalinity required | |||
Sodium hydroxide = | 4 kg | ||
Sodium bicarbonate = | 12 kg | ||
Calcium carbonate = | 7 kg | ||
Magnesium oxide = | 2 kg |
The algae factor in shallow tank lagoon systems
When a leachate treatment system matures, there will not only be a healthy population of bacteria, but the algae levels will also be quite high. In order for their to be an input from algae the treatment system should be open to direct sunlight. The algae will metabolize the ammonium and in the process they will also produce oxygen. In system that have a high ammonium, it is best to use two or more lagoons or open tanks. Once the algae become established they will reduce the ammonium levels very quickly and in the process produce oxygen.
Algae will grow heterotrophically in the absence of sunlight, while they are still beneficial in system, the algae will consume oxygen and they are more difficult to cultivate.
Algae level in a 4 x lagoon system | ||||
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Raw leachate
| lagoon 1 50% reduction in COD and ammonium, water becomes quite clear, little to no algae present | lagoon 2 Algae bloom develops and water turns green. | lagoon 3 Daphnia and zooplankton bloom crops the algae and reduces the green colour | lagoon 4 Stable algae level and biological system. Newts, frogs, and some fish now living in treatment system
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