PSA Oxygen for Aquaculture: Sizing, Dissolved-Oxygen Targets & ROI vs Liquid O₂
Fish and shrimp ponds need dependable dissolved oxygen. Compare on-site PSA oxygen generation with liquid O₂: DO targets, sizing method, energy cost and payback.
Intensive aquaculture should hold dissolved oxygen at 5–10 mg/L. An on-site PSA O₂ generator delivers 90–95% oxygen continuously, eliminating liquid-O₂ logistics. Demand is estimated from biomass, feed rate and temperature.
Why Dissolved Oxygen Is the Limiting Factor
Above ~28°C water holds less oxygen, and oxygen demand rises with feed rate. Aeration alone struggles in intensive or indoor RAS systems. Pure-oxygen injection through fine-bubble diffusers or oxygen cones keeps DO in the 5–10 mg/L band regardless of weather.
Sizing in Three Steps
- Estimate O₂ demand: rule of thumb — 0.5–1.0 kg O₂ per kg of feed, plus baseline water demand.
- Convert to gas flow: 1 Nm³ O₂ ≈ 1.43 kg. A 10 t shrimp farm at high feed may need 3–10 Nm³/h.
- Add margin: size the PSA at 1.25× average demand with a small liquid-O₂ backup for maintenance days.
PSA vs Liquid Oxygen: Running Cost
Indicative comparison (continuous 10 Nm³/h duty)
| PSA on-site (90–95%) | Electricity only — no delivery logistics |
| Liquid O₂ delivered | Product cost + rental tank + delivery charges; price varies by region and volume |
| Typical PSA payback | 12–30 months on continuous intensive operation |
What purity do I need for aquaculture?
90–95% O₂ from a standard PSA unit is ideal. Higher-purity (99.5%+) units cost more and are unnecessary for aeration.
Can PSA keep up with peak-season demand?
Size the generator for the peak month average with a 25% margin. A liquid-oxygen top-up covers unusual peaks economically.
Is the oxygen safe for the fish?
Yes — this enrichment method is used worldwide. Dissolve the oxygen before it contacts stock to avoid supersaturation gas-bubble disease, and monitor DO continuously.
Send pond area, species, stocking density and feed rate — we will size a complete PSA oxygen package.
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