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Wednesday, 22 May 2019 10:23

Initiative could yearly divert 100,000 tonnes of waste ash from landfill

Heat treatment experts at the Advanced Forming Research Centre at the University of Strathclyde have teamed up with Enva, formerly William Tracey Group, to further research into a sustainable initiative that could save up to 100,000 tonnes of waste ash from landfill each year.

The project, commissioned by Enva, and funded by Construction Scotland Innovation Centre (CSIC), saw heat treatment methods used to diminish contaminants from ash to produce high quality concrete pellets for the construction industry.

Enva Ash pellets

Enva collects ash from waste and biomass plants, most of which goes to landfill as waste. The recycling and resource management company investigated the possibility of turning the waste stream into a construction product with both commercial and quality benefits.

Experts at the AFRC carried out various furnace trials to determine the most suitable time and temperature required to produce a reliable concrete product made from waste ash, cement and water. The mix was then made into small pellets.

A non-contact infrared thermometer monitored temperature uniformity across the batch of pellets throughout the heat treatment process and provided additional information on the optimum temperature required.

The trials confirmed that the pellets were potentially environmentally friendly and highlighted that the refined quality of the ash component increased the strength of the product.

Enva Aurik Andreu copyScott Newport, Technical Manager at Enva, said: "The research carried out by the AFRC helped us understand more about the behaviour and performance of the ash, allowing us to take our first steps in exploring how we can best utilise this product, which was previously scrapped as waste.

"It's an exciting time within the industry to create circular initiatives that will open up various opportunities from revenue and job creation, and we're thrilled that we're closer to achieving this."

Dr Aurik Andreu, Senior Manufacturing Engineer at the AFRC said: "Enva is focused on diverting waste streams from landfill by creating an alternative aggregate product that will provide cost and quality benefits for industry.

"The heat treatment process allowed us to develop an in-depth understanding of how components within the ash operate to determine the optimum way of maximising these benefits and help Enva further research into a new product for industry."

Jennifer Smart, Business Relationship Manager at the CSIC, said: "As a result of CSIC funding and the expertise within the AFRC, this successful project has allowed Enva to take a significant step towards commercialising a new product for the construction industry.

"This could have a significant impact on the supply chain, creating new jobs and new markets and lead to further expansion of the business operation throughout the UK and Ireland and potentially further into mainland Europe."

Enva, a provider of recycling and resource recovery solutions, employs over 1100 people at locations across the United Kingdom and Ireland.

https://enva.com