Difficult
off-gas.
Solved.
Battery recycling, hazardous waste, pyrolysis, bitumen and heavy industrial processes produce off-gas that carries several contaminant groups at once: organics, acid gases, sulphur compounds. One repeatable core, configured for your stream, from assessment through design, equipment and long-term service.
The first technical assessment is free.
Source: Directive (EU) 2024/1785 amending Directive 2010/75/EU; Council of the European Union, Industrial emissions directive: key figures.
Where we work
Applications where a single stream carries different groups of contaminants, or where oxidation has to be combined with downstream treatment. Each is assessed individually against its own stream.
Lithium-ion battery recycling
Gases from processing battery materials can contain organic compounds together with substances requiring separate treatment. Scope is set from the specific recycling process.
Hazardous waste processing
Variable incoming materials produce complex gas compositions. Our system can serve as the oxidation stage within an installation that also includes downstream treatment.
Pyrolysis and thermal waste processing
Process gases can contain organic compounds and CO. Our system can operate as a separate gas-processing stage in an existing or new line.
Asphalt and bituminous materials
Production, storage and loading can generate gas streams with organic compounds and other constituents. Selection accounts for flow variability and plant integration.
Chemical and petrochemical
Scope depends on stream composition and variability. The system can run standalone or as part of an integrated treatment installation.
Metallurgy and foundries
Some processes generate gases with constituents that can be oxidised alongside substances requiring separate removal. Configuration follows assessment of the source.
We also consider other industrial applications where the gas characteristics and operating requirements justify an individually engineered treatment system. Europe is our primary market, including countries outside the EU; projects elsewhere are considered case by case.
Why mixed streams are hard
Not because the equipment is poor — because mixed, variable streams sit outside what most single technologies are designed for.
Catalysts and biology have limits on mixed streams
Sulphur compounds can deactivate many oxidation catalysts, and high or variable loads of aromatics can inhibit biological systems. Sulphur-tolerant catalysts and well-designed biofilters work well within their range — but a stream that combines several contaminant groups, or varies widely, often needs an application-specific design and a combination of treatment methods.
A single technology rarely handles a mixed stream
Wet scrubbing is the right tool for acid gases and is part of many complete systems, including ours. What it cannot do on its own is deal with a stream carrying organics and acid gases together — those require different process functions, combined and controlled as one system.
Off-gas streams vary
Composition, flow and calorific content change with the feed, the batch and the operating mode. Equipment has to be designed for that full range, not just the average.
Site integration is a constraint
Treatment usually has to fit an existing footprint, the available utilities and a planned commissioning window — not the other way round.
One system, built for your gas.
We analyse your real gas stream, agree the design basis, then select the configuration: high-temperature oxidation where organic compounds and CO need to be oxidised, and the right downstream treatment for HF, HCl, SO₂ and other components. Not one standard device for every case — an engineered system for your application.
Gas oxidation and treatment
High-temperature thermal oxidation is a mature, widely used industrial treatment principle. In STEP 2, microwave energy is the method we use to supply heat to the reactor and hold it at process temperature. Each system is engineered for the specific stream.
In a fully electric configuration, no auxiliary fuel is burned to heat the reactor — so there are no CO₂ emissions or additional flue gas from burning that fuel, which can reduce the size of downstream equipment. The benefit is assessed for each project from its energy balance.
- Electrically powered high-temperature section; auxiliary heat only if the process energy balance requires it
- Designed for integration into existing plant, with the installation scope agreed per project
Note: streams carrying heavy metals, particulates or aerosols need separate removal stages — identified at screening.
Thermal processing
High-temperature processing of solid or liquid feedstock that produces a controlled gas stream for STEP 2. Considered for selected projects, case by case; not yet a production-ready product.
Measure first. Then commit.
We first understand your real gas stream and agree the design basis. Engineering and equipment selection follow — and only then do we define expected performance and confirm it by testing. Results are never promised before we know the gas composition, flow, temperature, humidity and process variability.
Assessment
Review of your process, flow, temperature, contaminants and objective. We establish whether the application is technically sensible before anyone spends money.
Design basis
Minimum, nominal and maximum flow, composition, temperatures, variability, utilities and acceptance criteria — formally agreed and frozen.
Engineering
Process concept and balances, P&ID, general arrangement, equipment and instrument lists, control and safety philosophy, and integration with your existing plant, utilities and control systems.
Build
Fabrication and integration to our drawings, then controlled workshop testing of interlocks, diagnostics and documentation.
Commissioning
Installation, start-up and tuning on the real process stream.
Validation
Verification against the agreed criteria using the agreed measurement methodology, by an accredited third party where required.
Service
Annual agreement covering maintenance, consumables and coordination of the compliance testing you need, carried out by accredited laboratories.
If we cannot help
We say so at the assessment stage, and tell you what would work instead.
Talk to an engineer, not a salesperson
Tell us about your stream. An engineer reviews it and gives you an honest first answer.
Built on industrial experience
OXIAN is an industrial environmental engineering company based in Vilnius, Lithuania. We focus on one problem: off-gas that standard systems find hard — small, variable streams carrying several contaminants at once.
We are a small, engineer-led team working directly with technical managers and environmental engineers. Equipment is manufactured to our drawings by a contracted partner. Our own project record starts with the work we deliver now.
We are also developing THERMA LAB, a research and validation programme for characterising new materials and gas streams.
| Company | UAB Oxian, Vilnius, Lithuania |
| STEP 2 — gas oxidation and treatment | Available — built to order |
| STEP 1 — thermal processing | In development — selected projects |
| Geography | Europe, including non-EU countries; elsewhere case by case |