Industry • Recycling

Robust Emission & Odour Control for the Recycling Industry

Recycling facilities handle mixed and variable streams that can release odorous organics, acid/base gases, aerosols and abrasive particulates. Ravebo designs and builds tailored wet scrubber systems that protect people and assets, reduce nuisance and keep operations compliant.

Ravebo emission control at recycling facility

Why emission & odour control matters in recycling

Mixed waste streams, intermittent peaks and harsh chemistries demand predictable, low-maintenance abatement. The right system protects workers and neighbours, prevents corrosion and secures permits.

  • Compliance & permits
    Meet emission limits and reduce odour complaints.
  • Worker & community safety
    Capture toxic and odorous compounds before release.
  • Asset protection
    Limit corrosion and sticky deposits on ducts and stacks.
  • Operational continuity
    Stable performance with predictable OPEX.

Key challenges in Recycling

From sulphur odours to acid fumes and moist, particulate-laden exhaust—recycling sites need robust capture and separation across changing loads.

Top challenges

  • Odorous organics
    Amines/aldehydes/ketones from washing, shredding and drying lines.
  • H₂S & NH₃
    Organics/AD and certain waste streams generate nuisance gases.
  • Acid fumes from hydromet
    HCl/H₂SO₄ mists and fumes during leaching/neutralisation.
  • Aerosols, steam & solids
    Moist exhaust with fibres/dust needs reliable separation and drainage.
Recycling process lines and exhaust capture

Ravebo solutions for the Recycling Industry

We configure wet scrubbers per application—matching absorption chemistry, droplet separation, materials and controls for compliant, low-maintenance performance.

Packed-bed absorption

High-efficiency gas absorption for acid/base gases (HCl, H₂SO₄ mist, NH₃) with the right liquor and residence time.

Mist elimination & polishing

High-efficiency droplet separation and optional polishing (e.g., carbon) to minimise residual odour/VOCs.

Materials & abrasion control

PP, PE, PVC-C, FRP or stainless; wear-aware layouts, cleanable internals and access for inspection.

Water & effluent management

Optimised recirculation with monitored blowdown (pH/ORP/conductivity), neutralisation/oxidation and solids handling.

Scrubber system at battery-recycling hydromet line
Case Study

Acid-gas abatement at battery-recycling hydromet line

A recycling plant experienced corrosive fumes and odour around hydrometallurgical stations. Ravebo supplied a compact multi-stage scrubber with packed-bed absorption, high-efficiency mist elimination and integrated blowdown handling.

  • >99% acid-gas removal (application-dependent)
  • Corrosion reduction on nearby equipment and stacks
  • Permit compliance with audit-ready documentation

Why partner with Ravebo

Decades of abatement experience, Dutch engineering and in-house manufacturing — from design to installation and aftercare.

  • 40+ years in wet scrubbing & odour control
  • In-house engineering & production in the Netherlands
  • Proven projects across recycling segments
Ravebo engineering & manufacturing for recycling

Discuss your challenge with our scrubber specialist

Get targeted advice for odour reduction, acid/base gas removal and compliant operation on your site.

Contact us

Recycling FAQ

What emissions are typical in recycling plants?
Odorous organics, H₂S/NH₃ from organics handling, acid gases and mists from leach/neutralisation steps, and moist particulate-laden exhaust from washing and drying lines.
How do you handle solids and abrasion?
Wear-aware layouts with pre-separation, cleanable internals and access doors; materials selected for chemistry and abrasion. We design drains and demisters to limit re-entrainment.
How is water and effluent managed?
Recirculation with monitored blowdown (pH/ORP/conductivity), neutralisation/oxidation and solids handling, aligned with site permits and wastewater limits.
Industry • Green Energy & Cleantech

High-Performance Emission Control for Green Energy

From hydrogen and battery manufacturing to PV and e-fuels, green-energy processes can release corrosive fumes, solvent vapours and aerosols. Ravebo designs and builds tailored wet scrubber systems that protect people and assets, ensure permit compliance and support sustainable operations.

Ravebo emission control at green-energy facility

Why emission control matters in green energy

Cleantech sites handle reactive chemicals, solvent systems and high moisture loads. Robust abatement protects workers and neighbourhoods, prevents corrosion and underpins ESG and permit compliance.

  • Compliance & ESG
    Meet emission limits and support transparent reporting.
  • Worker & community safety
    Capture toxic/odorous compounds before release.
  • Asset protection
    Reduce corrosion on ducts, stacks and plant equipment.
  • Operational continuity
    Stable performance with predictable OPEX.

Key challenges in Green Energy

From corrosive etch fumes to alkaline aerosols and solvent vapours, cleantech sites need predictable, low-maintenance abatement.

Top challenges

  • Corrosive acid/base gases
    HF/HCl/HNO₃ from PV; NH₃ and amines from processes; H₂SO₄/KOH mists.
  • Aerosols & high humidity
    Electrolyser carry-over and moist off-gas need robust separation.
  • Solvent vapours
    Coating/binder systems (e.g., NMP alternatives) and e-fuel syntheses.
  • Variable loads & scale-up
    Pilot-to-gigafactory scaling with peaks and start/stop modes.
Green-energy processing lines and utilities

Ravebo solutions for Green Energy

We configure wet scrubbers per application — matching absorption chemistry, droplet separation, materials and controls for compliant, low-maintenance performance.

Packed-bed absorption

High-efficiency gas absorption for acid/alkali fumes (HF, HCl, HNO₃, NH₃) with the right liquor and residence time.

Mist elimination & polishing

Multi-stage droplet separators and optional polishing (e.g., carbon) to minimise residual odour/VOCs.

Materials & construction

PP, PE, PVC-C, FRP or PVDF/PTFE; stainless/special alloys where required — selected for corrosion resistance and lifetime.

Modular skids & control

Factory-tested modules with inline pH/ORP/conductivity, flow/level control and ready-to-connect utilities.

Scrubber system on electrolyser balance-of-plant
Case Study

Alkaline-mist control at hydrogen electrolyser hall

An electrolyser facility experienced alkaline aerosol carry-over and corrosion around exhaust points. Ravebo supplied a compact, multi-stage scrubber with packed-bed absorption and high-efficiency mist elimination, integrated with blowdown handling and site controls.

  • >99% alkaline-mist removal (application-dependent)
  • Corrosion reduction on nearby equipment and stacks
  • Permit compliance with audit-ready documentation

Why partner with Ravebo

Decades of abatement experience, Dutch engineering and in-house manufacturing — from design to installation and aftercare.

  • 40+ years in wet scrubbing & mist control
  • In-house engineering & production in the Netherlands
  • Proven projects across cleantech segments
Ravebo engineering & manufacturing for cleantech

Discuss your challenge with our scrubber specialist

Get targeted advice for acid/base gas removal, aerosol capture and compliant operation on your site.

Contact us

Green Energy FAQ

What emissions are typical in green-energy plants?
Acid/base gases from PV/chemical steps (HF, HCl, HNO₃, NH₃), alkaline aerosols/moist air from electrolysers, and solvent vapours/odours from certain coating or synthesis steps.
Can systems be delivered as modular skids?
Yes. We offer factory-tested modules with utilities and instrumentation pre-integrated for fast-track projects and scale-ups.
How do you manage water and effluent?
Recirculation with monitored blowdown (pH/ORP/conductivity), neutralisation/oxidation where needed, and documentation aligned with site permits.
Industry • Aeronautics & Aerospace

Clean Air & Surface-Treatment Emission Control for Aeronautics

Aircraft manufacturing and MRO involve surface treatment, coating and composite processes that can release acid/alkali fumes, solvent vapours and aerosols. Ravebo designs and builds tailored wet scrubber systems that keep air clean, protect workers and assets, and ensure regulatory compliance.

Ravebo emission control at aeronautics facility

Why emission control matters in aeronautics

The sector handles corrosive media, hazardous vapours and large, variable airflows. Robust abatement protects people and equipment, prevents neighbourhood nuisance and keeps permits intact.

  • Regulatory compliance
    Meet strict limits for acid mists and VOCs; support REACH/COSHH documentation.
  • Worker & community safety
    Capture toxic and odorous emissions before release.
  • Asset protection
    Reduce corrosion on ducts, stacks and hangar equipment.
  • Operational continuity
    Stable, controllable abatement with predictable OPEX.

Key challenges in aeronautics

From hexavalent chromium mists to solvent-rich exhaust, aerospace facilities need reliable, predictable abatement across variable operating modes.

Top challenges

  • Acid mists from surface treatment
    H₂SO₄, HNO₃, HCl, HF and Cr(VI) aerosols from anodizing/etch lines.
  • Solvent VOCs from coatings/cleaning
    MEK, toluene/xylene, alcohols; odour and compliance issues.
  • Large & intermittent airflows
    Hangar operations and batch processes with peaks and idle modes.
  • Materials & effluent management
    Correct plastics/alloys and proper blow-down treatment.
Aerospace surface treatment and paint operations

Ravebo solutions for aeronautics

We configure wet scrubbers per process — matching absorption chemistry, droplet separation, materials and controls for compliant, low-maintenance performance.

Packed-bed absorption

High-efficiency gas absorption for acid/alkali fumes (HCl, HF, HNO₃, H₂SO₄, NH₃) with the right liquor and residence time.

Mist elimination & polishing

Multi-stage droplet separators and optional polishing (e.g. carbon) to minimise residual VOCs and odour.

Materials & construction

PP, PE, PVC-C, FRP or PVDF/PTFE; stainless or special alloys where required — selected for corrosion resistance and lifetime.

Control & integration

Capture hoods/ducts, airflow control, inline pH/ORP/conductivity monitoring, redundancy and permit-ready reporting.

Scrubber train on anodizing and etch line
Case Study

Acid-mist abatement on anodizing line

An aircraft-components factory faced exceedances from surface-treatment tanks. Ravebo supplied a compact, multi-stage scrubber system with packed-bed absorption and high-efficiency mist elimination, integrated with capture hoods and effluent handling.

  • >99% acid-mist removal (process-dependent)
  • Reduced corrosion on nearby equipment
  • Permit compliance with audit-ready documentation

Why partner with Ravebo

Decades of wet-scrubbing experience, Dutch engineering and in-house manufacturing — from design to installation and aftercare.

  • 40+ years of abatement expertise
  • In-house engineering & production in the Netherlands
  • Proven projects across aeronautics sites
Ravebo engineering & manufacturing for aeronautics

Discuss your challenge with our scrubber specialist

Get targeted advice for acid-mist control, VOC reduction and compliant operation at your facility.

Contact us

Aeronautics FAQ

What emissions are typical in aeronautics?
Acid/alkali fumes and mists (H₂SO₄, HNO₃, HCl, HF, Cr(VI)), solvent VOCs from coating/cleaning, and aerosols/steam from processes such as curing or stripping.
Which materials of construction do you use?
PP, PE, PVC-C, FRP or PVDF/PTFE for corrosive media; stainless or special alloys where needed. Selection is based on chemistry, temperature and lifetime requirements.
Can systems handle large, intermittent airflows?
Yes. We design capture hoods and controls for variable flow, with appropriate liquid management and instrumentation to maintain performance during peaks and idle modes.

What is Odor Concentration (ouE/m³)?

Odor concentration expresses how “smelly” an air sample is, independent of which compounds cause the smell. In Europe it’s reported as ouE/m³ (European odor units per cubic metre) according to EN 13725. It’s determined with dynamic olfactometry: a panel of trained assessors smells diluted sample air and we record the dilution where the odor becomes just detectable.

Definition

By convention, 1 ouE/m³ equals the detection threshold for an odor sample: at this concentration, 50% of a trained panel can just detect the odor. If a sample needs to be diluted 200 times to reach that threshold, the original odor concentration is 200 ouE/m³.

How dynamic olfactometry works (EN 13725)

  • Collect a representative air sample in an inert sampling bag.
  • Use an olfactometer to mix the sample with neutral (odor-free) air in controlled steps.
  • A trained panel indicates from which dilution they can just detect the odor.
  • The dilution-to-threshold yields the odor concentration in ouE/m³.

Sampling basics

  • Use clean, inert bags and lines suitable for odor work; avoid contamination.
  • Record temperature, humidity, flow, and sampling position and conditions.
  • Analyse promptly after sampling and follow your lab’s holding time rules.

Interpreting results

Odor concentration is a screening metric for nuisance risk. Local permits or guidelines define acceptable levels at sources or receptors. Combine periodic olfactometry (ouE/m³) with process monitoring (e.g. H₂S or NH₃ in ppm) to understand both nuisance and root causes.

ouE/m³ vs ppm (can I convert?)

No general conversion exists. ppm measures the concentration of a specific gas; ouE/m³ measures human perception of a whole odor mixture. For mixtures, many compounds interact, so a simple factor won’t hold.

Reducing odor concentration

Odor is typically reduced by capture and treatment. For soluble or reactive compounds (e.g. H₂S, NH₃), wet gas scrubbers are a proven option. For poorly soluble VOCs, consider pre-cooling, chemical stages or polishing (e.g. carbon).

FAQ

Is 1 ouE/m³ always the same everywhere?

The unit is standardised (EN 13725) and labs calibrate their olfactometers with a reference odor. Still, results depend on sampling and panel performance; use accredited labs and consistent procedures for comparability.

How many samples do I need?

For compliance, follow permit or guideline requirements. For troubleshooting, take multiple samples over time and operating conditions to capture peaks and variability.

Can I use H₂S ppm as a proxy for odor?

H₂S correlates with odor in many processes, but odor is a mixture. Use gas analyzers to manage process and olfactometry (ouE/m³) to verify nuisance risk at the source or stack.

What reduction can a wet scrubber achieve?

For soluble/reactive compounds, well-designed scrubbers often reach high removal. Final performance should be confirmed by measuring odor concentration (ouE/m³) against site limits.

Need help?

We design and size odor control systems and can coordinate accredited measurements. See odor nuisance & emission control or contact us.

Biochar in the Netherlands

Biochar in the Netherlands — CO₂ removal & circular applications

Biochar can store CO₂ for long periods and connects to agriculture, construction and industry. Recent studies show that actual use in the Netherlands is still limited. Below we explain what biochar is, where it fits, and what needs to be in place for scale-up.

Biochar is about capturing CO₂ from the atmosphere and keeping it stored safely.

What is biochar?

Biochar is a carbon-rich solid produced when organic material—such as crop residues, wood or manure—is heated under low-oxygen conditions (pyrolysis). Much of the carbon remains stored in a stable solid instead of returning to the atmosphere as CO₂. In theory, biochar can hold that carbon for centuries.

Biochar production process: biomass heated in low-oxygen environment produces biochar, oil and syngas.

Where can it be used?

  • Agriculture: improves soil structure and water retention; potential yield benefits.
  • Construction: tested as a filler in asphalt and concrete, embedding carbon in materials.
  • Industry: can partially replace fossil coal in some processes (e.g., steelmaking).
  • Biogas & manure: use in digesters; co-products (pyrolysis oil, syngas) influence economics.
Biochar is a stable, carbon-rich material, often similar in appearance to charcoal.
Bottom line: technically promising, but in the Netherlands still mostly small-scale. Scaling up requires clear policy, credible certification and a functioning carbon-removal market.

What needs to be in place?

  • Credible certification: robust methods to measure and verify stored CO₂ so certificates carry value.
  • Policy & incentives: EU and national frameworks to make adoption attractive and predictable.
  • Sustainable feedstocks: clean biomass to avoid contaminants (e.g., heavy metals/PAHs) and unwanted impacts.

Ravebo & biochar

At Ravebo we deliver proven emission-reduction solutions every day, such as advanced wet scrubber systems. These help companies reduce harmful emissions today and comply with regulations. In parallel, we closely monitor innovations like biochar to advise clients with a level head and a future-proof view.

Get in touch with our scrubber specialist

Boost your industrial processes with our advanced wet gas scrubbers. Our specialist is ready to help with expert advice and custom solutions.

Contact us

Transparency: Insights based on CE Delft (2025). Biochar is technically promising but not yet widely feasible in the Netherlands.

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  3. Chemicals
  4. Pharma

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Get in touch with our scrubber specialist

Boost your industrial processes with our advanced wet gas scrubbers. Our specialist is ready to guide you towards efficiency, productivity, and environmental compliance. Connect with us now for expert advice, custom solutions, and quick responses. Let's find your perfect scrubber solution today.

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