No cylinder deliveries
Oxygen is generated continuously on site - no scheduling, no storing bulk liquid oxygen on a rural farm.
PSA Oxygen Generation
Oxygen Generator for Aquaculture (PSA)
A PSA oxygen generator for aquaculture makes high-purity oxygen on site from ambient air, feeding cones, diffusers and nanobubble generators around a dense fish or shrimp farm without cylinder deliveries or bulk liquid oxygen storage.
- Output1-50+ Nm3/h
- Purity90-95% O2
- PowerContinuous, grid-tied
- FeedCone / diffuser / nanobubble
ISO 9001 CE OEM / ODM
15+ years in aquaculture engineering · Trusted by Japfa Group, Japan Nissui & Tropo Farms · Shipped worldwide in one container
An oxygen generator for aquaculture uses pressure swing adsorption (PSA) to pull oxygen straight out of the air on site, so a farm never has to schedule cylinder deliveries or store bulk liquid oxygen. Air is compressed, passed through a molecular sieve that adsorbs nitrogen, and the enriched oxygen stream (typically 90–95% purity) feeds directly to oxygen cones, diffusers or nanobubble generators around the site.
Compared with a rented liquid oxygen tank, a fish farm oxygen generator runs continuously at a fixed daily cost and removes the safety and logistics burden of storing cryogenic liquid oxygen on a rural site. It also outperforms blower-only aeration once stocking density climbs, because dissolved oxygen from a PSA stream can be pushed well past what surface aeration alone can deliver during hot, low-pressure nights.
SIGMA sizes each PSA oxygen generator to the farm's peak biomass and delivery point — hatchery, grow-out pond or RAS loop — and pairs it with oxygen cones or fine-bubble/nanobubble diffusers so the gas actually dissolves before it reaches the fish.
Specifications
Models & configuration
Output, purity and power draw are the standard indicative range - final sizing is confirmed by SIGMA before shipment.
| Model | Capacity | Typical use | Core configuration |
|---|---|---|---|
| SIGMA-OG-3 | 3 Nm3/h - 93% O2 | Hatchery / small farm | Single compressor, one sieve tower |
| SIGMA-OG-10 | 10 Nm3/h - 93% O2 | Mid-size pond cluster | Twin-tower PSA, buffer tank |
| SIGMA-OG-25 | 25 Nm3/h - 90-93% O2 | Large farm / multiple cones | Twin-tower PSA, oil-free compressor |
| SIGMA-OG-50 | 50 Nm3/h - 90-93% O2 | Commercial RAS / hatchery complex | Multi-tower, PLC monitoring |
| Process | Pressure swing adsorption (PSA) - molecular sieve adsorbs nitrogen from compressed air |
|---|---|
| Output purity | 90-95% O2, adjustable against flow rate |
| Delivery | Feeds oxygen cones, fine-bubble diffusers or nanobubble generators |
| Duty | Continuous running, sized to peak farm biomass |
| Comparison | Runs at a fixed daily power cost, unlike scheduled liquid oxygen deliveries |
| Options | Oxygen buffer tank, flow monitoring, back-up cylinder manifold |
System composition
High-density-ready
Feeds oxygen cones and nanobubble generators so dissolved oxygen keeps up with dense stocking, not just surface aeration.
Fixed running cost
Runs on grid power at a predictable daily cost instead of fluctuating cylinder or liquid oxygen prices.
Sized to peak biomass
Output (Nm3/h) is matched to the farm's hatchery, grow-out pond or RAS oxygen demand before shipment.
Application
- Hatcheries and nurseries needing stable high-DO water
- High-density grow-out ponds and RAS loops feeding oxygen cones
- Live-fish holding and transport tanks
- Farms in remote areas without reliable liquid oxygen supply
Gallery
Product Photos
FAQ
Frequently asked questions
What is a PSA oxygen generator and how does it work?
A PSA (pressure swing adsorption) oxygen generator fish farm setup compresses ambient air and passes it through a molecular sieve that adsorbs nitrogen, leaving an enriched oxygen stream of roughly 90-95% purity that feeds directly to cones or diffusers.
PSA oxygen generator vs liquid oxygen - which is better for a fish farm?
Liquid oxygen aquaculture supply is higher purity but needs scheduled deliveries and safe cryogenic storage on site. A PSA oxygen generator runs continuously at a fixed power cost with no deliveries - most farms switch to PSA once oxygen demand is steady enough to justify the equipment, and keep liquid oxygen only as an emergency back-up.
PSA oxygen generator vs a roots blower - do I need both?
A roots blower moves plain air (about 21% oxygen) and is the lower-cost option for moderate aeration. A PSA oxygen generator delivers 90%+ oxygen for dense stocking or emergency low-DO events. Many farms run a roots blower for routine aeration and add a PSA oxygen generator with cones for peak biomass periods.
Can the oxygen feed a nanobubble generator?
Yes - the oxygen-enriched stream from the PSA unit can feed a nanobubble generator for aquaculture, producing extremely fine bubbles that dissolve almost completely instead of rising and popping at the surface.
How is the generator sized for a fish farm?
Sizing is based on peak biomass, target dissolved oxygen level and delivery method (cone, diffuser or nanobubble). SIGMA reviews stocking density and pond volume before recommending an output (Nm3/h).
Does the oxygen generator need much maintenance?
Routine maintenance is mainly air-filter and compressor servicing; the molecular sieve itself has a long service life under normal operating conditions.
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View details →Request a tailored quote
Tell us your species, target density and site — our engineers size the system and reply within one business day.
Oxygen Generator for Aquaculture (PSA) Request a Quote