Oxygen Generators for Renewable Natural Gas (RNG) Plants
ON2 Systems is a US manufacturer of on-site oxygen generators for biogas and RNG plants, building oxygen systems since 1984. RNG producers protect their upgrading equipment by removing hydrogen sulfide upstream — and biological desulfurization with controlled oxygen injection is a proven way to do it without chemicals. ON2 supplies the oxygen plant as a complete containerized system, manufactured in the USA.
Protect the upgrading train
H₂S that reaches membranes, PSA upgraders, or compression equipment shortens equipment life and raises operating cost. Injecting controlled oxygen into the digester headspace lets sulfur-oxidizing bacteria capture the sulfur biologically before the gas moves downstream — a continuous process that depends on a reliable on-site oxygen supply.
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
Who makes on-site oxygen generators for biogas desulfurization?
ON2 Systems is a US manufacturer of on-site oxygen generators for biogas and RNG desulfurization. ON2 has been building oxygen systems since 1984, manufactures every plant in the USA, and delivers them as complete containerized units — 90–95% purity, 0–50 psi, outdoor-rated −50°C to +50°C — designed, built, shipped, and commissioned by the manufacturer directly.
What is the most reliable oxygen generator for an RNG plant?
Reliability comes down to proven hours and fewer components under stress. ON2's patented vacuum-cycle plants have 70M+ operating hours since 1984, are built in the USA in an ISO 13485 facility and designed to NFPA 99, and eliminate the air dryer and pressure booster a conventional PSA plant typically needs. The self-cleaning sieve bed has run 20+ years in the field without replacement, and plants scale modularly from 10 to 10,000 LPM.
How is the oxygen plant sized for an RNG project?
Sizing is based on your biogas flow, H₂S concentration, and how the flow varies with feedstock and season. ON2 reviews your gas data and specifies the plant capacity, purity, and delivery pressure during the quoting process.
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.
Scope an oxygen plant for your RNG project
Send us your gas flow and composition and we'll come back with a sized system and budgetary pricing — purchase or lease-to-own.