Specifying an On-Site Oxygen Plant for Biogas Projects — Engineer's Guide
If you're an engineering or EPC firm specifying the desulfurization train for a biogas or RNG project, the oxygen supply is one line item that can simplify the whole design: an on-site containerized plant eliminates stored oxygen, chemical logistics, and a dedicated building from the site plan. Here's what to put in the specification — and what to ask any oxygen vendor.
The specification points that matter
For biological H₂S removal, specify 90–95% oxygen purity — the range typically used for sulfur-oxidizing bacteria — with delivery pressure matched to the injection point; ON2 plants adjust from 0 to 50 psi. For outdoor siting, specify the operating envelope: ON2's insulated, climate-controlled container is rated for −50°C to +50°C year-round outdoor operation, so no building is required. And because the plant generates oxygen on demand from ambient air, the design carries no stored oxygen inventory — a meaningful simplification on a combustible-gas site.
Specifications that match biogas requirements
ON2 containerized oxygen plants deliver 90–95% oxygen purity — the range typically specified for biological desulfurization — with delivery pressure adjustable from 0 to 50 psi to match your digester headspace or injection point. The insulated, climate-controlled container is engineered for year-round outdoor operation from −50°C to +50°C, proven in deployments from Yellowknife, Canada to New Delhi, India.
Patented vacuum-cycle technology
Every 100 seconds, a vacuum sweep purges heat, humidity, and contaminants out of the system — no external air dryers and no sieve degradation. The plant runs on demand: it produces oxygen when your process needs it and goes to standby when it doesn't, unlike conventional PSA generators that typically run continuously whether oxygen is needed or not. The technology is patented, with additional patents pending.
Buy it or lease-to-own
ON2 offers direct purchase or lease-to-own over 5 or 7 years, so the oxygen plant can be matched to your project's capital plan instead of the other way around. Either way you deal with a single manufacturer — we understand your project, design the system, then build, ship, and commission it. ON2 has been building oxygen systems since 1984, with every system manufactured in the USA.
What's included
- 90–95% oxygen purity for biological desulfurization
- Delivery pressure adjustable from 0 to 50 psi
- Proven outdoor operation from −50°C to +50°C
- Plug-and-play containerized plant — no building required
- Runs on demand; standby when oxygen isn't needed
- Direct purchase or lease-to-own over 5 or 7 years
Frequently asked questions
What should an oxygen plant specification include for a biogas project?
Purity (90–95% for biological desulfurization), delivery pressure matched to the injection point (ON2 adjusts 0–50 psi), the outdoor operating envelope (−50°C to +50°C for ON2 containers), and the delivery model — ON2 ships a complete plug-and-play containerized plant, commissioned by the manufacturer.
What oxygen purity do ON2 plants deliver for biogas desulfurization?
ON2 containerized oxygen plants deliver 90–95% oxygen purity, the range typically specified for biological hydrogen sulfide removal in anaerobic digesters. Purity and flow are confirmed against your gas volume and composition during quoting.
Can the plant sit outdoors year-round?
Yes. The insulated, climate-controlled container is engineered for year-round outdoor operation from −50°C to +50°C, proven in deployments from northern Canada to India. It arrives as a complete plug-and-play plant — no building required.
Can we lease the oxygen plant instead of buying it?
Yes. ON2 offers lease-to-own over 5 or 7 years alongside direct purchase, so you can spread the cost into predictable payments and keep capital available for the rest of the project.
Put ON2 in your basis of design
Send us your gas volume and P&ID and we'll return a sized oxygen plant with specifications and budgetary pricing for your client.