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In aquaculture production, the use of aerators is more and more extensive, but at present some fishermen do not understand its working principle, type and function, and it is blind and random in actual operation. Therefore, you must understand its working principle, type and function, and then master its use method in practice.
How Microporous Oxygenation Works! The purpose of using an aerator is to add dissolved oxygen to the water body. This involves both the solubility of oxygen and the rate of dissolution. The former consists of 3 factors:
① water temperature;
②Salinity of water;
③ oxygen partial pressure;
The latter includes 3 factors:
④ Degree of unsaturation of dissolved oxygen
⑤The contact area and method of water vapor
⑥ water movement.
Among them, ① and ② are a stable state of the water body, which cannot be changed in general, and ④ is the factor that we want to change, and it is also a current state of the water body. Therefore, in order to achieve oxygenation to the water body, it is necessary to directly or indirectly change the three factors of ③⑤⑥. In view of this situation, the measures taken by the nano aerator when designing the aerator:
(1) Use mechanical components to stir the water body to promote convective exchange and interface renewal;
(2) Disperse the water into fine mist droplets and spray them into the gas phase to increase the contact area of water and gas;
(3) Inhale through negative pressure to disperse the gas into microbubbles and press into the water.
Various types of aerators are designed and manufactured according to these principles, and they either take one measure to promote the dissolution of oxygen, or take two or more measures.
Due to the many functions of the aerator, the conditions of the pond are varied and the weather conditions are ever-changing, it is not easy to use the aerator in a timely and effective manner. Improper use of aerators will not only waste energy, but also affect fish production. In the teaching and production practice, the author realizes that it is necessary to master the use method of the aerator according to the purpose of using the aerator. Turn on the aerator when the fish is floating, this is what is commonly called the aerator to rescue the fish for hypoxia. When rescuing fish floating heads, no matter at any time of the day, the start-up time will continue until the floating head symptoms disappear. Do not stop the machine halfway, so as to avoid the floating fish scattered to the edge of the pool, and it is not easy to gather in the current and cause death. It should be pointed out that it is a normal phenomenon for the pond fish to float slightly in the morning, and it is not necessary to start the machine when the temperature is normal. It is better to use a fountain aerator when rescuing the floating head, because it can rapidly aerate the surface water, and at the same time cause the water
(1) When the weather is sultry, the air pressure is low, and there may be thunderstorms in the evening (you can refer to the weather forecast for judgment), turn on the aerator at noon. At this time, start the aerator to eliminate the oxygen debt of the bottom water, improve the oxygen reserve of the water body, and avoid the floating head of the pond fish in the morning of the second day. The start-up time is generally 1~2 hours (3 kW power, 3~10 acres of load water), and it will end before 16:00 at the latest. Because the photosynthesis of phytoplankton is greatly weakened after 16:00, after the water layer is exchanged, the dissolved oxygen in the surface water generally will not rise to the supersaturated state before starting the machine.
(2) When the photosynthesis is weak, the aerators are mainly in the following weathers: ①Rainy days with weak light, especially continuous rainy days; ②In the weather covered by autumn fog, the photosynthesis is weak and the pool is water-soluble. Oxygen is very low, and the accumulated oxygen debt is very large. It is necessary to turn on oxygen to ensure safety. The boot time is mainly during the day, and it is to use a fountain aerator.