PSA Oxygen Generator for Aquaculture Aeration | 90–95% O₂ | Qingdao Green Power

A PSA oxygen generator produces oxygen on site by separating it from compressed air with zeolite molecular sieve (ZMS) in a twin-tower pressure swing adsorption system, and in aquaculture that oxygen is used for dissolved-oxygen enrichment of fish and shrimp ponds.

The published range is 90–95% O₂ at 1–500 Nm³/h, with outlet pressure from 0.1 to 0.4 MPa and energy use of 0.3 to 0.5 kWh per Nm³ of oxygen produced.

Intensive aquaculture is normally held in a dissolved-oxygen band of 5–10 mg/L; demand is estimated from biomass, feed rate and water temperature, using 0.5–1.0 kg of oxygen per kg of feed as a working rule and 1 Nm³ of oxygen ≈ 1.43 kg.

Generators are typically sized at about 1.25 times average demand with a small liquid-oxygen backup for maintenance days, and the oxygen is dissolved through oxygen cones or fine-bubble diffusers before it contacts stock.

Standard PSA oxygen at 90–95% serves aquaculture and industrial duty and is not intended for direct respiratory medical use.

The PSA oxygen range is published as a purity and capacity configuration rather than a numbered model table: fix the required oxygen flow first, then confirm purity, outlet pressure and energy use for the duty.

• Adsorption towers: two adsorber vessels alternate between adsorption and regeneration, so the oxygen supply is continuous.
• Molecular sieve: zeolite molecular sieve (ZMS) selectively adsorbs nitrogen from the compressed air so oxygen passes through as product gas at 90–95% purity.
• Air dryer: the package includes an air dryer that brings the compressed-air moisture load down so the feed-air dew point requirement is met before the air reaches the sieve bed.
• Filtration: filtration stages remove oil aerosol and dust carried over from the compressor and receiver, protecting the sieve bed.
• Air receiver: a buffer tank (air receiver) between the compressor and the PSA towers steadies the feed-air supply.
• Control cabinet: PLC automatic control with an optional HMI touch screen; the control cabinet manages the valve cycle and the operating parameters.
• Purity monitoring: an oxygen analyser monitors the purity of the product oxygen, and its calibration is checked on schedule.
• Feed air: compressed air at 0.6–0.8 MPa with a dew point of -40°C or lower, oil-free.

• Fish and shrimp pond aeration: supplies oxygen for dissolved-oxygen enrichment where aeration alone struggles at high stocking density.
• Intensive and indoor systems: suits intensive or indoor farms that need a dependable oxygen supply regardless of weather.
• Oxygen cones and diffusers: feeds fine-bubble diffusers or oxygen cones so the gas dissolves before it reaches stock.
• Peak-season support: covers the peak month average demand, with a liquid-oxygen top-up for unusual peaks.
• On-site generation: replaces liquid-oxygen delivery logistics with oxygen produced at the farm.
• Hatcheries and nurseries: supports sensitive early-life stages that need a stable dissolved-oxygen level.

• Hold intensive aquaculture in a 5–10 mg/L dissolved-oxygen band and monitor it continuously.
• Estimate demand from biomass, feed rate and water temperature; 0.5–1.0 kg O₂ per kg of feed is a common starting rule.
• Size the generator at about 1.25 times average demand and keep a liquid-oxygen top-up for maintenance days.
• Dissolve the oxygen before it contacts stock to avoid supersaturation problems, using oxygen cones or fine-bubble diffusers.
• 90–95% purity is the standard range; higher-purity units cost more and are unnecessary for aeration.
• Do not use standard PSA oxygen for direct respiratory medical applications.