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Mr Adam Griffiths

Professional Description:

Principal Consultant, Chartered Mechanical Engineer (MIMechE)


CEng (MIMechE), MSc, BEng (Hons)

Ricardo Energy & Environment
Gemini Building
Fermi Avenue
OX11 0QR
Area of work:



Adam is a chartered mechanical engineer with over 13 years’ experience in the waste and recycling industry. He has experience in all aspects of project delivery from tendering and bidding for projects, design, project management and delivery under CDM, and commissioning and process engineering of new facilities. He is technical lead within Ricardo for mechanical processing technologies.

Adam has undertaken a range of projects as part of Ricardo’s waste technical team. These include owner’s engineer roles for Material Recovery Facilities (MRF), providing expert opinion on mechanical processing for a number of waste streams, due diligence, feasibility studies for waste treatment technologies and more. Adam is also a technical advisor to WRAP (Waste Resource Action Programme) on MRF operation as part of a framework agreement. In addition Adam has lead projects exploring new and developing sectors in the waste market deploying alternative waste treatments such as the capture and deployment of aquaculture waste sludges and treatment of absorbent hygiene products. This has given him a wide view of approaches to waste processing across a range of sectors and applications.

Adam has been an expert witness since 2019, applying his technical knowledge and experience to a range of commercial disputes. Adam has been required to read and digest large quantities of technical data, project data, regulatory position and anecdotal accounts in order to fully understand and appreciate the details of each case. Adam has reviewed evidence submitted by the opposite party and provided analysis and opinion to allow barristers and lawyers to understand the issues and prepare counter arguments. He has written clear and well-reasoned expert reports which have been submitted to the court as part of the dispute resolution process and has given evidence in Court under cross examination.

Adam has provided expert opinion in several different areas, principally on the composition of waste and suitability for the process at hand, and the suitability of certain waste processing systems and technologies for the duty and waste type. 

Ricardo’s waste technical team employs a number of experts with extensive technical, commercial, operational, market and regulatory insight in the waste sector and waste treatment technologies and infrastructure. Adam leads a team of senior engineers with a combined experience covering a wide range of waste processing technologies including energy from waste (EfW), anaerobic digestion (AD), advanced conversion technologies (ACT) including gasification, pyrolysis and waste to liquid bio-fuels, Mechanical Biological Treatment (MBT), composting including in-vessel composting (IVC), materials recovery facilities (MRF).

Adam is technical lead for mechanical processing technologies and as such is involved in a range of projects primarily related to mechanical sorting processes but including other mechanical elements such as incinerator bottom ash handling and materials handling. Adam has worked on projects both in the UK and around the world including Australia and the Middle East.

Before joining Ricardo Energy & Environment, Adam was a Senior Process Engineer with Biffa Waste Services at their £120m West Sussex MBT plant comprising of mechanical treatment and anaerobic digestion to process over 300,000 tonnes of household waste. Adam oversaw a number of elements of the commissioning and acceptance testing of the facility, then worked to ramp up the plant to full contract service delivery and ensure steady state operation of the plant. Prior to that Adam worked for Shanks Waste Management (now Renewi) on several of their large PFI waste treatment projects utilising MBT technology, including mechanical sorting, anaerobic digestion (AD), biodrying and autoclaving. Adam also lead the technical aspect of a number of smaller PFI and privately financed bids for waste treatment projects in the UK.

• Expert opinion in commercial disputes, claims and adjudications
• Technical, market and commercial due diligence
• Waste composition and suitability for mechanical processing.

Adam is detailed and methodical, with excellent written and verbal communication skills. He is capable of digesting and understanding large amounts of very detailed information and interpreting this into clear, articulate written reports. He is experienced in providing expert opinion in disputes and arbitration proceedings, having been cross examined on the content of his expert reports.

Adam’s expert advice is based around many years of industry experience, both in consultancy and with large national waste management businesses. Adam’s career to date has given him an in depth understanding a number of waste industry technologies including MRF, AD, autoclave, Combined Heat and Power (CHP), composting, and more. He is experienced in the operational aspects of running a large process plant and ensuring compliance with regulators such as the Environment Agency, OFGEM and the Animal and Plant Health. He has presented and reviewed designs and proposals at HAZOP, FMEA and ALM reviews, and has knowledge of DSEAR and ATEX regulations both the point of view of both material storage and handling, and biogas train and storage.

Adam’s practical hands-on knowledge of process plant from concept through to commissioning and steady state operations in a heavily regulated and safety critical environment gives him a good awareness of the challenges involved in designing and operating major waste processing infrastructure, providing an invaluable insight when approaching new projects and opportunities.

A&L Goodbody for a confidential client (2019 – present). Part of a small team of experts providing opinion in a contractual dispute between a Contractor providing waste processing equipment and the Client, centring around waste composition and the suitability of the design of the equipment to effectively process the waste stream.

Eversheds Sutherland (International) LLP for a confidential client (2019-2020). Expert Witness providing opinion to a law firm in a dispute between the operator of a glass recycling firm and the Contractor who supplied processing equipment. Adam worked on behalf of the glass re-processor who were the respondent in the dispute. He visited the plant on several occasions and reviewed the plant design specification, feedstock composition and supporting documentation to provide opinion on the performance and operation of the plant. Adam was cross examined on his expert evidence during an online hearing at the ICC International Court of Arbitration.

Ward Hadaway law firm for a confidential client (2020). Provided expert opinion to a law firm representing an operator processing C&D waste in dispute with the Environment Agency with regard to the classification of the un-processed and processed materials under European Waste Catalogue (EWC) coding. Adam visited the processing sites and produced a report which was 

Slaughter and May for Essex County Council (2018-2020). Provided expert opinion on technical matters on behalf of Essex County Council in its dispute with the EPC contractor who provided waste processing infrastructure and services under a long-term PFI contract.


Member of the Chartered Institution of Mechanical Engineers

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