Oxygen Injection Systems for Anaerobic Digesters
Micro-aeration — dosing small, controlled amounts of oxygen into the digester headspace — is a widely used biological method for controlling H₂S in anaerobic digestion. ON2 containerized oxygen plants supply that oxygen on-site, at the purity and pressure the process calls for.
Controlled dosing, not bulk oxygen
Digester oxygen demand is modest and varies with biogas flow and composition — some sites run consistently, others intermittently. Because ON2 plants run on demand and go to standby when oxygen isn't needed, the supply follows your process instead of running flat-out around the clock.
Low-pressure headspaces covered
Many digester headspaces are maintained at only a few millibar, so the oxygen line needs delivery in the low-psig range rather than high-pressure supply. ON2 plants adjust from 0 to 50 psi, covering low-pressure headspace injection through higher-pressure process points on the same unit.
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.
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 systems made in Canada and the US.
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
Can the delivery pressure be adjusted to our injection point?
Yes. Delivery pressure is adjustable from 0 to 50 psi, which covers typical digester headspace injection requirements — including low-pressure headspaces maintained at only a few millibar where outlet pressure requirements sit in the low-psig range.
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.
Size an oxygen system for your digester
Share your biogas flow, H₂S level, and headspace pressure and we'll specify the right plant with budgetary pricing.