Principle Biogas provides thier knowledge and experience to Anaerobic Digestion Facility owners and operators, Water Authorities, Regulatory Authorities and Policy Makers.



Principle Biogas is the engineering consultancy division of Marches Biogas Ltd and consists of a team of experienced designers and process engineers who have worked within the anaerobic digestion industry for many years dating back to the late 1980’s.

The team has extensive knowledge and experience of the design, build, commissioning and operation of a wide variety of digestion facilities including sewage sludge digesters, the first full scale food waste plant and design & development of a wide range of on farm facilities with outputs ranging from 25kWe to 2MWe.

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photograph of principle biogas equipment


Principle Biogas consists of a team of motivated engineers providing independent experience and knowledge for the following services.


Process Design

Mechanical Design

Electrical Design

Principal Deread moresigner Duties


Process Safety

DSEAR Surveys

HAZOP Studies

H&S Advice

Facility Safety Auditread mores



Design & Build

Principal Contractor Duties

Build Quality Assurance

Flexible Appro



Commissioning & Decommissioningread more

Trainingread more

Plant Operation Studies


Process Assessments

Operational Audits

Operational Trouble Shooting

Lithium Trace Tests


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Research & Developmentread more

A Flexible Approach To Existing Plant Improvement And Design & Build Projects

Principle Biogas offer a flexible approach to design and build projects for new plants, or extensions of existing facilities through a series of work packages and can perform all the work packages or a combination of the work packages to suit your requirements as outlined in the diagram below.

Infographic of the design process

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Case Studies

Bagley Biogas

Since the completion of the original plant build in 2014, Principle Biogas has continued to support Bagley Biogas in the expansion and development of their site.

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HAZOP Studies

HAZOP studies were successfully undertaken for two separate sites to ensure that plant design had mitigated any risk to personnel or equipment.

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Pressure Vacuum Relief Valve & Gas Holder Inspections

Marches Biogas (Principle Biogas division) has the ability to carry out the inspections of pressure vacuum relief valves and gas holders using breathing apparatus and escape sets.

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Siloxane Removal System Maintenance and Media Change

Dwr Cymru Welsh Water commissioned Marches Biogas, (Principle Biogas division) to act as principal contractor and manage the system maintenance and media change of their siloxane removal systems across multiple sites.

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Evolution Biogas

If your requirement is for plant operational support please contact us through Evolution Biogas.

We work with facilities throughout the UK to continually improve the performance of AD plants.

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Associated With

We work with many organisations throughout the anaerobic digestion industry.