H₂S Scrubbers for Paper Mill Effluent Biogas
H₂S scrubbers that clean biogas from paper mill anaerobic effluent treatment for boilers and engines.
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Clean biogas from paper mill effluent treatment
CRA's H₂S scrubbers clean the biogas from paper mill anaerobic reactors for boilers, engines and upgrading, with bulk removal below 100 ppm and polishing below 5 ppm.
Outlet H₂S after bulk removal
Below 100 ppm
Outlet H₂S with polishing
Below 5 ppm
Caustic saving
Up to 90% with regeneration
End use
Boilers, engines and upgrading
How is H₂S removed from paper mill effluent biogas?
The scrubber is chosen for the sulphur load and the end use of the gas. A biological scrubber relies on bacteria growing on packing to oxidise the H₂S. The chemical scrubber with biological regeneration absorbs the H₂S in an alkaline solution that bacteria then regenerate, keeping air out of the gas. Activated carbon after either one adsorbs the remaining H₂S where a tight outlet is needed.
How it works
The scrubber sits on the biogas line between the anaerobic reactors and the boilers, engines or upgrading plant.
Biogas from the anaerobic reactors flows to the scrubber.
The scrubber removes most of the hydrogen sulphide.
In the chemical scrubber, bacteria restore the solution for reuse.
Activated carbon brings H₂S lower where the end use needs it.
The treated gas goes to the boilers, engines or upgrading plant.
Key Benefits
Removing H₂S cuts corrosion in boilers, engines and gas lines.
Bulk scrubbing brings H₂S below 100 ppm for boilers and engines.
Carbon polishing takes H₂S below 5 ppm for upgrading.
Biological regeneration cuts caustic consumption by up to 90%.
CRA sizes the scrubber from the measured H₂S and gas flow.
Projects That Push Boundaries
Chemical scrubber with biological regeneration and activated-media polishing designed to reduce H2S from 10,000 ppm to below 200 ppm.
The CRA Edge
CRA has more than 30 years of experience in gas handling and flare engineering.
Design, R&D and manufacturing are carried out under one roof.
ISO 9001 certified through TÜV NORD, with designs aligned with ASME, API and CE.
Designs are customised to the process needs and the regulations that apply at site.
Applications
Built to help you specify.
Sizing tools, decision guides, and technical references. Use them before, during, and after your evaluation.
Frequently Asked Questions
Why is paper mill effluent biogas high in H₂S?
Paper mill process water often carries sulphate, which bacteria in the anaerobic reactor reduce to hydrogen sulphide. The H₂S then leaves with the biogas.
Which scrubber suits a paper mill?
For boilers and engines a biological scrubber is usually suitable. For high loads, or where the gas goes to upgrading, CRA uses the chemical scrubber with biological regeneration, followed by carbon polishing.
How low can the scrubber take H₂S?
After bulk removal, outlet H₂S is below 100 ppm. With activated carbon polishing it falls below 5 ppm.
What data does CRA need to size a paper mill biogas scrubber?
CRA needs the gas flow and its H₂S range, how the mill will use the gas and the site conditions.
Can the scrubber be added to an existing effluent plant?
Yes. The scrubbers are skid-mounted and connect to the existing biogas line.