The principle of microporous oxygenation technology is developed from indoor industrialized high-density aquaculture through aerated oxygenation technology. It has been tested and applied in pond aquaculture since this century. It is a new aquaculture technology that can greatly increase and improve the dissolved oxygen content of water body, thereby improving the aquaculture output, aquaculture product specification, survival rate and product quality of ponds, and is conducive to promoting Fishery Ecology, health, high-quality and safe aquaculture, Reduce the use of drugs, achieve higher aquaculture benefits and ensure the quality and safety of aquatic products.

(1) causes of hypoxia syndrome in aquaculture water

1.1 cloudy weather.

Dissolved oxygen in the pond is mainly produced by photosynthesis of phytoplankton. If the sunlight is weak or lacking for several days in succession, the photosynthesis of phytoplankton will be restricted and hypoxia syndrome will appear.

1.2 thunderstorm and monsoon season.

Thunderstorm will make the pool water convection up and down, and in the monsoon season, the water body convection will also occur, resulting in the "flood pool" phenomenon. Hypoxia syndrome occurred.

1.3 mass death of plankton.

This phenomenon usually occurs when a large amount of algal scum appears on the surface of the water body or the transparency is less than 15 cm. The death and decomposition of plankton consume a large amount of oxygen, which is characterized by the pool water suddenly becoming clear, and the transparency is increased by 2 times or even several times. When this phenomenon occurs, it indicates that the hypoxia syndrome is very serious, and oxygen supplement measures must be taken when this situation occurs.

1.4 in winter, the snow cover is severe, and hypoxia may also occur.

(2) working principle and background of microporous pipeline oxygenation Technology

2.1 working principle.

The "microporous oxygenation" technology is a pool bottom aeration and oxygenation facility composed of Roots blower and microporous pipe, which can directly transfer the oxygen in the air to the bottom of the water bottom, disperse air from the bottom of the pool to the water body to supplement oxygen, so that the water body at the bottom can maintain high dissolved oxygen, prevent the oxygen deficiency of the water body caused by the oxygen deficiency at the bottom, greatly improve the dissolved oxygen content of the water body, and ensure sufficient dissolved oxygen content at the bottom of the pool, It can eliminate the oxygen debt of the water body. It can also promote the degradation of organic wastes in the pond, activate the bottom of the pond, reduce the cost of medication, and finally achieve the goal of improving the growth rate, survival rate and raising the production of aquaculture.

2.2 background

2.2.1 need for improvement of living conditions of breeding varieties.

Ammonia nitrogen, nitrite and hydrogen sulfide at the bottom of the water body play the role of oxidation, can inhibit the breeding of pathogenic bacteria in the pond, activate the water quality of the pond, and maintain the stability of the physical and chemical factors of the pond water quality.

2.2.2 the need of high-efficiency fishery development (famous, special and excellent aquatic products breeding).

The good water quality brought by the high dissolved oxygen can not only improve the stocking density of cultured organisms, but also improve the aquaculture yield, which can increase by 20-30% on average.

2.2.3 quality and safety of aquatic products.

Improve the environmental conditions of aquaculture, improve the resistance of aquaculture animals, reduce the occurrence of diseases, reduce the use of drugs, and increase the quality and safety of aquatic products. The important research on dissolved oxygen shows that the dissolved oxygen status is an important factor that can affect the feed intake of breeding organisms, i.e. the digestibility and absorption rate after feed intake, as well as the growth rate and feed coefficient. Generally, aquaculture animals require that the dissolved oxygen in the water must be kept above 5 mg / L for optimal growth. Studies have shown that 60% of the fish died due to hypoxia. The growth rate of grass carp in the water of 5.5 mg / L dissolved oxygen was 9.88 times higher than that of 2.7 mg / L, and the feed coefficient was 5.5 times lower.

(3) advantages of microporous oxygenation Technology

3.1 high oxygen increasing efficiency and activated water body.

The bubbles generated by the ultra-fine pore aeration can fully contact with the water body, so that the floating velocity is low, the contact time is long, the oxygen dissolution efficiency is high, and the effect is good. Sufficient dissolved oxygen can make the water body establish a natural ecosystem and make the dead water live.

3.2 improve the breeding environment.

The microporous oxygenation technology can change the surface oxygenation to the bottom oxygenation, and the variable point oxygenation can increase the oxygen of the whole pool, which can meet the growth needs of cultured organisms. It is characterized by greatly improving the oxygen increasing efficiency of the pond and releasing sufficient oxygen; It can accelerate the decomposition of organic matter to improve the bottom aquaculture environment.

3.3 the use cost is low.

Microporous oxygenation technology can improve the efficiency of water oxygenation, but the energy consumption is less than one fourth of the traditional oxygenation equipment, which greatly saves the cost.

3.4 safety and environmental protection.

The microporous tube aeration and oxygenation device is generally installed on the shore, with convenient operation, easy maintenance, good safety performance, and will not bring any pollution to the water body, especially suitable for shrimp and crab breeding.

3.5 energy saving.

The distribution of microporous aeration points is relatively uniform, the overall oxygen distribution balance of the pond is good, and the unit energy consumption is low. Take 10 mu water surface aquaculture as an example: when the water depth of the product is 1.5-2m, the power consumption is only 1.5KW when the oxygen increasing capacity of 10kgo2 / h is reached, while the blade wheel type aerator needs 6-9kw. If the oxygen increasing day is 180 days, the power can be saved by 10000 kWh and the operating cost can be saved by more than 5000 yuan.

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