The Chaipattana Aerator is a low speed surface aerator for which His Majesty holds a patent in Thailand. A lot of different models
have been developped in the years after its invention. Such devices may significantly improve the water quality of lakes / ponds which
have no natural source of air / oxygen.
Water & Oxygen, dissolved Oxygen
Water is a habitat not only for fish, but also for a lot of bacteria and plants. Similar to organisms on land, oxygen is necessary for them
to survive. Fish and crustaceans have gills to absorb the oxygen for respiration. They need a minimum of 4 mg O2 per liter of H2O
to survive without damage.
The capability of water to dissolve oxygen is 9.1 mg/l @ 20 °C (maximum, lower at higher temperature). But this is only a theoretical value.
The actual value is lower, because of other substances dissolved in water or because fish absorb the oxygen. On the other hand it is increased
by introducing oxygen through various mechanism.
The amount of dissolved oxygen is therefore a balance between absorber and donator, temperature and other substances dissolved.
If this balance is seriously disturbed, one would speak of waste water or « น้ำเสีย ».
Countermeasures • Principles of Operation
To avoid (or cure) that, it is possible to enrich the water with air. This is very advantageous for still waters like lakes or ponds, where
no natural flow takes place. Here, the aerator produces some waterflow to enrich the water with air (which consists of approx. 21 % of oxygen).
The model RX-2 consists of two wheels where in between are six baskets mounted. The baskets are open on top and have a lot of small holes at the walls
and at the bottom. This ensures, that, when the wheels turn, the baskets are filled quickly when diving into the water and empty slowly in
a lot of thin water jets, maximizing its efficiency by creating turbulence in the water.
8) floating body
9) transverse connector