Desulphurisation Towers
for Biogas H₂S Removal and Gas Quality Control
Reliable hydrogen sulphide removal for biogas, landfill gas and sewage gas applications, supporting equipment protection and gas quality compliance.
Over 45 Years in Operation
1000's of UK Installations
Supporting 100's of UK Sites
Effective H₂S removal is critical to protecting assets, maintaining performance and ensuring biogas can be safely used or upgraded.
Biogas often contains hydrogen sulphide (H₂S), a corrosive and harmful component that can damage engines, pipework and upgrading systems if not properly removed.
Desulphurisation towers provide a reliable and proven method of reducing H₂S levels before gas is used in CHP systems or upgraded for grid injection. These systems form a key part of wider biogas treatment strategies, including Biological Desulphurisation for AD Plants, where controlled processes are used to remove sulphur compounds and stabilise gas quality.
In applications where gas is being upgraded for injection into the grid, maintaining both low H₂S and controlled oxygen levels is critical. Desulphurisation systems are often integrated alongside Gas-to-Grid Upgrading through Oxygen Injection & Control, ensuring gas meets the required specifications for safe and compliant export.
Accurate gas measurement also plays an important role in understanding system performance and verifying treatment effectiveness. Systems are commonly supported by technologies used in Biogas Flow Measurement for AD Plants, helping operators monitor flow, optimise processes and maintain consistent plant performance.
Allison Engineering provides desulphurisation solutions tailored to plant size, gas composition and process requirements, supporting operators across anaerobic digestion, wastewater and landfill gas applications.
Desulphurisation Tower Systems
From compact systems for smaller plants through to advanced low-oxygen solutions for gas-to-grid upgrading, Allison Engineering can help specify the right desulphurisation tower for your application, gas composition and operating conditions.
SH Classic
A robust biological desulphurisation tower designed for high-efficiency H₂S removal in demanding biogas and gas treatment.
Reliable, low-maintenance performance even at high sulphide levels, protecting downstream equipment and supporting long-term operation.
SH SulphPur
A low-oxygen biological desulphurisation system designed for biomethane upgrading and gas-to-grid applications.
Delivers efficient H₂S removal with minimal energy and water consumption, ensuring stable gas quality and reliable long-term performance.
SH S-KAT
A compact biological desulphurisation system designed for smaller biogas plants and lower flow applications.
The SH S-KAT delivers reliable H₂S removal in a cost-effective, space-saving design, supporting stable operation and equipment protection.
Why Choose Desulphurisation Towers
Effective H₂S removal
Reduce hydrogen sulphide levels to protect equipment, improve gas quality and support CHP or biogas upgrading systems.
Proven biological process
Biological desulphurisation provides a stable and reliable method of converting H₂S into elemental sulphur with consistent long-term performance.
Suitable for challenging gas conditions
Well suited to wet, contaminated and variable biogas streams where dependable operation is required across changing process conditions.
Flexible system options
Available in compact, standard and advanced configurations depending on plant size, gas composition and application requirements.
Supports gas-to-grid applications
Low oxygen systems enable desulphurisation without compromising gas quality, supporting upgrading and injection compliance standards.
Improves plant reliability
Reducing H₂S helps minimise corrosion, reduce downtime and extend the life of engines, pipework and process equipment.
Suitable for Multiple Industry Sectors
Renewable Energy & Biogas
Essential for removing H₂S from biogas streams before CHP use or gas-to-grid upgrading, ensuring reliable operation and gas quality compliance.
Utilities & Energy Management
Supports energy generation systems where treated gas is used efficiently and safely across industrial and energy applications.
Wastewater & Water Treatment
Used in sewage digestion systems where biogas requires treatment to protect equipment and support stable plant performance.
Chemical & Process
Used where gas streams contain sulphur compounds that must be removed to protect process equipment and maintain product quality.
Oil & Gas
Relevant in specific gas treatment and sulphur removal processes where controlling corrosive gas components is important for asset protection.
Energy from Waste
Applicable to gas treatment systems where consistent gas quality and reduced corrosive components are required for reliable operation.
Need information or advice?
Speak with our friendly, expert team to discuss your requirements and find out how we can help you.
Full Service UK Solutions
Allison Engineering supports desulphurisation projects from initial assessment through to installation and long-term support, ensuring each system is correctly specified for the application.
Specifications & Planning
Assessment of gas composition, H₂S levels, flow rates and process requirements to determine the most suitable desulphurisation solution.
Supply & Commissioning
Product supply, installation and first fit support, commissioning and full setup to ensure analysers are working correctly in the field.
Support & Optimisation
Ongoing UK based servicing, calibration, maintenance and technical support to keep analysers accurate and systems performing reliably over time.
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Desulphurisation Towers FAQs
Explore common questions about biogas desulphurisation, including how H₂S is removed, system selection and suitability for different applications.
What is a desulphurisation tower?
A desulphurisation tower is a system used to remove hydrogen sulphide (H₂S) from biogas or other gas streams. In biological systems, naturally occurring bacteria convert H₂S into elemental sulphur under controlled conditions, reducing corrosive and harmful gas components before the gas is used or upgraded.
Why is H₂S removal important in biogas?
Hydrogen sulphide is highly corrosive and can cause significant damage to CHP engines, pipework and upgrading systems. Removing H₂S helps protect equipment, reduce maintenance costs, improve safety and ensure the gas meets quality requirements for use or grid injection.
What types of desulphurisation systems are available?
Desulphurisation systems range from compact units for smaller plants to larger biological towers for high H₂S loads, as well as advanced low-oxygen systems designed for biomethane upgrading. The right system depends on gas composition, flow rate, H₂S concentration and application requirements.
Are desulphurisation towers suitable for gas-to-grid applications?
Yes. Certain systems are specifically designed to operate with very low oxygen addition, ensuring that gas quality is maintained for upgrading and grid injection. This is particularly important where oxygen levels must remain tightly controlled.
How do I choose the right desulphurisation system?
Selection depends on several factors including H₂S concentration, gas flow rate, plant size, available space and whether the gas will be used in CHP systems or upgraded for grid injection. A detailed review of the process ensures the most suitable system is selected for reliable, long-term operation.
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Why Trust Allison Engineering
We are committed to delivering the highest standards across the specialist areas we support, combining proven products with practical engineering knowledge and dependable service.
Need Help Selecting the Right Desulphurisation System?
Speak to our team to identify the most suitable desulphurisation tower for your application, ensuring reliable H₂S removal, improved gas quality and long-term plant performance.