Proving the concept of sewage sludge pyrolysis
Amount awarded: £6,205,773
Led by: Thames Water
Partners: Cranfield University, Helsinki Region Environmental Services (HSY), Southern Water, Stantec Ltd, Uisce Éireann, Yorkshire Water
Further details on Proving the concept of sewage sludge pyrolysis are available on the Thames Water website.
We aim to deliver the first continuously operating, sludge-fed UK-based pyrolysis demonstration plant. Pyrolysis (a high temperature process with no oxygen present) can be used to recycle sludge to maximise the value of biosolids; ensuring a circular economy and reducing the requirement for sludge to be recycled to agricultural land.
“Sludge is a resource not a waste, it contains nutrients required for plants and usable energy. This investment opens the door for a circular economy approach and can contribute to net zero carbon, enhance the environment and add operational resilience, therefore providing a sustainable future for biosolids management.” – Nevil Muncaster, Engineering & Asset Director, Thames Water
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The project has progressed with a revised procurement strategy, splitting responsibilities between the technology supplier (OEM) and a separate delivery partner who will manage installation and commissioning. While this approach has extended procurement by around seven months, it has improved engagement, compliance assurance, and built stronger relationships with suppliers, laying the groundwork for a more successful trial. We are working closely with suppliers to ensure the demonstration plant meets UK health and safety legislation, particularly the Dangerous Substances and Explosive Atmospheres Regulations (DSEAR). Because these types of plants aren’t commonly designed to operate in potentially explosive environments, our focus has been on reviewing and challenging supplier justifications to ensure all risks are thoroughly assessed and mitigated. We’ve also agreed with the Environment Agency to pursue a new type of R&D permit to support the trial. This involves a detailed environmental risk assessment using the EA’s H1 matrix. In parallel, we’re completing enabling works such as confirming ventilation requirements and ensuring there is enough safe working space in the existing building to accommodate the new plant.
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