Psa Oxygen Generator For Sea Bass Farming

Working Principle of pSA Oxygen generator
 

PSA oxygen generator uses pressure swing adsorption technology to produce oxygen by taking advantage of the difference in adsorption characteristics of different gases in the air. Air mainly contains nitrogen (about 78%), oxygen (about 21%), etc. The equipment is equipped with special adsorbents such as zeolite molecular sieves or carbon molecular sieves, which have different adsorption capacities for nitrogen and oxygen due to their unique microporous structure and surface properties.
Compressed air enters the adsorption tower. Under high pressure, the adsorbent preferentially adsorbs nitrogen and impurity gases. Because the kinetic diameter of nitrogen molecules is small, it is easy to enter the micropores of the adsorbent and be adsorbed, while the kinetic diameter of oxygen molecules is large and difficult to be adsorbed, and then enriched in the gas phase to produce oxygen-rich air for sea bass farming.
The adsorbent needs to be regenerated after being saturated with nitrogen. By reducing the pressure of the adsorption tower, nitrogen is desorbed from the adsorbent and discharged into the atmosphere, and the adsorbent restores its adsorption capacity, which is desorption.
In order to continuously and stably supply oxygen, PSA oxygen generators often use multiple towers (commonly two or more towers) to work alternately. When one adsorption tower is adsorbing and producing oxygen, the other towers are desorbing and regenerating. The PLC program accurately controls the working status and switching time of each tower to ensure the stable output of qualified oxygen-rich air. 
 

 

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Advantages of Psa Oxygen Generator For Sea Bass Farming

 

Improve growth efficiency
Oxygen is the key to the efficient growth of sea bass. Sufficient dissolved oxygen ensures its respiration and metabolism, and helps the digestive system to fully digest and absorb feed nutrients. For example, after a large farm in Guangdong used a PSA oxygen generator, the dissolved oxygen in the water was stable. The average growth rate of the sea bass in the experimental group was about 20% faster than that in the control group, and the weight gain was more obvious. The time to market was greatly shortened, the farmers' funds were recovered quickly, and the economic benefits were improved.

Reduce the risk of disease
Oxygen-rich environment is the "shield" of sea bass health. Sufficient oxygen strengthens the function of immune cells and helps them eliminate pathogens. When dissolved oxygen is sufficient, the physiological state of sea bass gill filaments is good, which reduces the attachment of harmful microorganisms, promotes metabolism, and enhances resistance. Studies have shown that when dissolved oxygen is sufficient, the incidence of sea bass is about 30% - 40% lower than that in anoxic environment, reducing fish deaths and drug use, producing green and healthy products, and improving market competitiveness.

Increase breeding density
Traditional sea bass breeding is limited by dissolved oxygen in the water, and it is difficult to increase breeding density. PSA oxygen generators can continuously supply high-purity oxygen to the water, ensuring sufficient oxygen supply to each sea bass at high density. For example, after land-based circular ponds are equipped, the breeding density can reach 30-50 per cubic meter of water, which is 2-3 times higher than the yield per unit area of ​​traditional ponds, significantly improving economic benefits and promoting the intensive and modern development of the industry.
 

FAQ:
 

1. Can the oxygen purity of the PSA oxygen generator meet the growth needs of fish?
The oxygen purity of PSA equipment is usually 90%-95%. The dissolved oxygen concentration of 5-12ppm can be accurately controlled by adjusting the adsorption parameters, completely covering the dissolved oxygen safety range (5.0-12.0ppm) of freshwater/marine fish. High-purity oxygen can reduce the respiratory rate of fish, promote protein deposition, and shorten the breeding cycle by about 15-30%.
 

2. How to choose the equipment model according to the scale of the farm?
Decentralized oxygen supply: suitable for small farms (such as water change volume <100L/s), diffuse oxygen through nano-carbon tube micropores, low investment but poor dissolved oxygen uniformity.
Centralized oxygen supply: recommended for large farms, equipped with a pressurized dissolved oxygen spray chamber, automatic control of dissolved oxygen, and energy consumption reduced by more than 20%.
 

3. Compared with traditional liquid oxygen, where is the operating cost advantage of PSA equipment?
Energy consumption cost: PSA consumes about 0.8-1.2kW·h of electricity per ton of oxygen, which is 40%-60% lower than the transportation cost of liquid oxygen.
Maintenance cost: There is no liquid oxygen tank rental fee, the molecular sieve has a life of 5-8 years, and the annual maintenance cost is only 3%-5% of the equipment price.
Case comparison: The annual oxygen supply cost of a 50m³ breeding pond is about 12,000 yuan for PSA and more than 30,000 yuan for liquid oxygen.
 

4. What are the equipment energy consumption and cost reduction technologies?
The new generation of PSA equipment adopts two-stage compression + waste heat recovery technology, which reduces energy consumption by 15%-20%; the intelligent pressure regulation system can dynamically match the changes in breeding density, further saving energy by 10%.
 

5. What professional support is needed for daily maintenance?
Core maintenance points: The molecular sieve is tested for adsorption capacity every 2 years, the air compressor filter is replaced every 500 hours, and the solenoid valve group is checked for sealing every month.
Manufacturer service: The head supplier provides a remote monitoring system (such as Suzhou Hit's Internet of Things platform), with a 4-hour on-site response to failures and an annual downtime of <0.5%.

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