Biogas Process Solutions
Reliable measurement, analysis and control solutions for efficient, stable and compliant biogas operations
Over 45 Years in Operation
1000's of UK Installations
Supporting 100's of UK Sites
Helping biogas operators improve performance, reliability and gas quality through proven process control solutions.
Biogas plants rely on accurate measurement, reliable control and consistent gas quality to operate efficiently. From digester performance through to CHP generation and gas-to-grid upgrading, every stage of the process requires dependable instrumentation and well-integrated systems.
Allison Engineering provides process control solutions across the full biogas lifecycle, supporting operators with technologies that are proven in real-world conditions and designed specifically for wet, contaminated and variable gas environments.
Our approach focuses on understanding the process first, ensuring that each solution is correctly specified for the application and delivers long-term reliability.
Biogas Applications
We support a wide range of biogas applications across anaerobic digestion plants, combining proven technologies with practical, application-led experience.
Biological Desulphurisation for AD Plants
Gas-to-Grid Biomethane Upgrading using Oxygen Injection & Control
Biogas Analysis for AD Plants
Biogas Flow Measurement for AD Plants
Biogas Flare Gas Monitoring for AD Plants
Fugitive Emissions Monitoring & Methane Leak Detection
VOC Monitoring for Biogas and Landfill Gas Applications
SIL Rated Oxygen Analysis for Biogas Upgrading
SIL & SIS Compliant Process Control Instrumentation
Why Choose Biogas Process Control Solutions
Designed for Difficult Gas Conditions
Biogas is wet, contaminated and variable in composition. Our solutions are selected specifically for these conditions, ensuring reliable performance.
Proven Across AD Plants
With hundreds of installations across the UK, our technologies are widely used on anaerobic digestion sites for CHP, flare and gas upgrading applications.
End-to-End Process Visibility
By combining flow measurement, gas analysis and control systems, operators gain full visibility of their process and can make informed decisions to improve performance.
Flexible, Scalable Solutions
From single measurement points to fully integrated systems across multiple digesters, solutions can be tailored to suit plant size and complexity.
Low Maintenance, High Reliability
Technologies with no moving parts and robust industrial design reduce maintenance requirements and improve long-term reliability over years of operation.
Supports Efficiency and Compliance
Accurate measurement and control systems help reduce waste, optimise energy output and meet regulatory and reporting requirements to protect your investment.
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 biogas projects from initial specification through to long-term operation, providing not just products but complete, application-led solutions.
Specifications & Planning
Application review, technical consultation and system design based on process conditions, gas composition and site requirements.
Supply & Commissioning
Supply of proven technologies with expert installation guidance, commissioning support and complete system integrations.
Support & Optimisation
Ongoing servicing, calibration, maintenance and optimisation to ensure systems continue to perform reliably over time.
Biogas Process Control FAQs
Common questions about measurement, analysis and control in biogas systems, including technology selection, applications and process optimisation.
What are the key measurements required in a biogas plant?
The most important measurements in a biogas plant are gas flow, gas composition and process conditions. Flow measurement provides visibility of gas production and usage, while gas analysis ensures the quality and composition of the biogas is understood.
In practice, these measurements are used together to optimise performance, protect equipment and ensure compliance with operational and environmental requirements.
Why is biogas considered a difficult application?
Biogas is typically wet, contains contaminants such as hydrogen sulphide, and operates at low pressure with fluctuating flow rates. The gas composition also changes depending on feedstock and digestion conditions.
These factors make it challenging for many conventional measurement technologies, which is why specialised instrumentation designed for biogas applications is required.
How can operators improve efficiency in AD plants?
Improving efficiency typically involves gaining better visibility of the process through accurate measurement and control. This includes monitoring gas flow, analysing gas composition and optimising systems such as desulphurisation and CHP operation.
With the right data, operators can identify inefficiencies, reduce waste and maximise energy output.
What is the best method for removing H₂S in biogas?
The most suitable method depends on the application, but biological desulphurisation using air or oxygen dosing is widely used due to its cost-effectiveness and efficiency.
For higher-performance applications such as gas-to-grid, oxygen injection with automated control provides improved gas quality and more precise control.
How important is gas analysis in biogas systems?
Gas analysis is critical for understanding process conditions and controlling key parameters such as H₂S and oxygen levels. Without continuous analysis, it is difficult to optimise performance or maintain stable operation.
In modern AD plants, analysers are often integrated into control systems to automate processes such as desulphurisation.
Can systems be integrated across the whole plant?
Yes. Modern biogas systems often combine flow measurement, gas analysis and control into a single integrated solution. This allows operators to monitor and manage the entire process more effectively.
Integration also enables automation, reduces operator workload and improves overall plant performance.
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 Optimising Your Biogas Process?
Speak to our team to identify the right measurement, analysis and control solutions for your application - from individual instruments to fully integrated systems designed to improve performance, reliability and efficiency.