In aquaculture production, the use of pond aerators is becoming increasingly widespread. However, some fishers still do not fully understand their operating principles, leading to blind and arbitrary practices in actual operation. Therefore, only by first grasping how these aerators work can one truly master their proper usage.

The design principle of fish pond aerators

In aquaculture production, the use of pond aerators is becoming increasingly widespread. However, some fishers still do not fully understand their operating principles, leading to blind and arbitrary practices in actual operation. Therefore, only by first grasping how these aerators work can one truly master their proper usage.

The design principle of fish pond aerators

The purpose of an aeration device for fish ponds is to increase the dissolved oxygen content in the water. This involves two key aspects: the solubility of oxygen and the degree of saturation of dissolved oxygen. Several factors influence these aspects, including water temperature, salinity of the water, and partial pressure of oxygen. The latter factor encompasses three elements: the degree of unsaturation of dissolved oxygen, the surface area and method of contact between water and air, and the state of water movement. Among these, water temperature and salinity represent stable conditions within a given body of water. Therefore, to increase oxygen levels in a water body, it is necessary—directly or indirectly—to modify the partial pressure of oxygen, the surface area and method of contact between water and air, and the state of water movement.

1. Use mechanical components to agitate the water, promoting flow exchange and interface renewal.

2. Disperse the water into tiny droplets and spray it into the air phase to increase the contact area between water and gas.

3. Gas is dispersed into microbubbles via negative-pressure suction and then injected into the water.

The fishpond aerator is designed based on these principles, employing measures that promote oxygen dissolution or combining two or more such measures.

The types and applicable scopes of fish pond aerators are as follows:

There are many different types of oxygenation products manufactured by various mechanical designs, each with distinct characteristics and operating principles. Consequently, their oxygenation effects vary significantly, as do their applicable scopes. Producers can select the appropriate oxygenation equipment based on the specific aquaculture system and the dissolved oxygen requirements, thereby achieving optimal economic performance.

1) Leaf-type aeration and yield-increasing machine: This machine features a combination of functions including oxygen enrichment, water retention, and aeration. It is currently the most widely used yield-increasing device, with an annual output of approximately 150,000 units. It boasts superior yield-increasing performance and power efficiency compared to other models; however, it generates significant operational noise and is typically employed in large-scale pond aquaculture with water depths exceeding 1 meter.

2) Waterwheel-type yield-increasing machine: This machine delivers excellent yield-increasing effects and promotes water flow. It is suitable for areas with deep sludge, covering an area of 1,000 to 2,540.

3) Jet-type oxygenator: This type of oxygenator boasts superior oxygen delivery efficiency compared to water-differential, air-driven, and spray-water oxygenators. It features a simple structure, can generate water flow, and even allows for the addition of water. The jet-type oxygenator can promote gentle and steady increases in aquatic productivity without harming fish, making it ideal for oxygenation in fish burial sites.

4) Fountain-type aerator: This type of aerator boasts excellent oxygenation performance, enabling it to rapidly increase the dissolved oxygen level in surface water within a short period. It also offers aesthetic appeal, making it ideal for fish farms located in gardens or tourist attractions.

5) Inflatable oxygen supply device: The deeper the water, the better the effect—ideal for use in deep-sea environments.

6) Submersible oxygenator: This device uses negative pressure to draw air into the water, creating water currents and vortices that propel the water forward with strong mixing action. It has a superior oxygenation capacity for lower-layer water compared to impeller-type oxygenators, though its oxygenation efficiency for upper-layer water is slightly lower than that of impeller-type oxygenators. 7) The vortex-type oxygenator 3360 is primarily used for oxygenating glacial waters in northern regions and boasts high oxygenation efficiency.

8) The 3360 yield-increasing pump is lightweight and easy to operate, featuring a single yield-increasing function. It is suitable for use in fish fry farms or greenhouse aquaculture facilities with water depths of 0.7 meters or less and areas of 0.6 mu or less.