What are the characteristics of the selection and use of aerators?

1. What are the commonly used aerators?

1, water jet aerator

Pump water into the nozzles installed in the middle and on the shore of the fish pond, so that the water is sprayed out and falls like rain, and the water contacts the air to increase dissolved oxygen. The power of this machine is generally 1. 1- 1.8kw, which is only suitable for small fish ponds with shallow water.

2. Impeller aerator

Through the principle of stirring water and aeration, the dissolved oxygen in water is increased, which has good oxygen-increasing effect and high power efficiency. There are many models according to the power of the motor. When in use, the whole machine floats in the center of the pond and is tied to the edge of the pond with a rope. When working, the impeller rotates and stirs the water body, which produces the functions of lifting water and promoting the mixing of water body, so that convection occurs up and down the water layer, and the dissolved oxygen of the whole water body tends to balance. The power of this machine is generally 1.5-3.0kw, which is suitable for ponds with water depth of1.5-2.0m. ..

3. Water wheel aerator

When working, the blades hit the water surface at high speed, stirring the air into the water to achieve the purpose of increasing oxygen. The general power of this aerator is 0.75- 1.5kw, which is suitable for shallow ponds. It does not stir the mud at the bottom of the pool and can keep the water fresh.

4. Inflatable aerator

The main engine is an air compressor or blower. When the air passes through the sand filter element or microporous plastic pipe installed at the bottom of the water after being pressurized, tiny bubbles are discharged, and the water body moves during the bubble rising process, and part of oxygen is dissolved in the water, so as to achieve the purpose of increasing oxygen. The general power of this machine is 0.75-2.2kw, which is suitable for deep-water fish ponds.

5. Swing aerator

Under the rotation of the counterweight, the outer side of the floating body exerts force on the horizontal plane, producing waves that spread around, thus increasing the contact area between the water surface and the air, and the oxygen in the air is constantly dissolved into the water. The power of this machine is generally 1. 1- 1.5kw, which is suitable for large-scale surface deep-water fish ponds with high efficiency.

Second, how to use the aerator correctly?

The aerator can not only supply oxygen needed by fish, but also promote the up-and-down convection of pond water to increase dissolved oxygen at the bottom, reduce harmful substances at the bottom and promote the oxidative decomposition of organic matter in the pond. It can also effectively improve the growth environment of fish, thus improving the physique of fish, increasing the digestion and absorption ability of feed, and further improving the aquaculture yield.

1, open at noon on sunny days.

In the fish growing season, the combination of phytoplankton oxygen production and mechanical air oxygen supply is used to start the aerator 1.0-2.0 hours at noon on sunny days, so as to give full play to the stirring function of the aerator, increase dissolved oxygen in the pond, accelerate the material circulation in the pond and improve the water quality, thus reducing or reducing the occurrence of floating head at night. Be sure to avoid turning on the machine in the sunny evening, similar to the thunderstorm in the evening, which will make the upper and lower water layers convection in advance, increase oxygen consumption and easily cause fish to float.

2. Continuous rainy nights.

In rainy days, phytoplankton has weak photosynthesis, low oxygen production capacity and insufficient dissolved oxygen in the pool, which is easy to cause floating head. At this time, it is necessary to give full play to the mechanical air oxygenation function of the aerator, start the machine as early as possible at night and aerate in time to directly improve the dissolved oxygen in the pool, so as to prevent and save the floating head of fish.

3, high temperature dawn, floating head for a long time.

The water temperature is high in summer and autumn during the day. If the temperature drops rapidly in the morning or evening, the convection between the upper and lower layers of the pool water accelerates ahead of time, and the dissolved oxygen drops, which is easy to cause floating head. Therefore, it is generally appropriate to start the machine at dawn in hot days, so as to give full play to the aeration and oxygenation function of the aerator, so that harmful gases such as hydrogen sulfide and ammonia accumulated at night can escape from the water surface, and at the same time, the dissolved oxygen in the pool can be prevented from being further reduced. If there is a warning of floating head, start the machine to save the fish until after sunrise, when there are no fish in the water.

4. Open in the early morning and at noon after fertilization.

When the water quality is too fat after a large amount of fertilization, the method of starting at noon on sunny days and starting in the morning should be adopted to improve the dissolved oxygen conditions in the pool and prevent floating head.