SAF from sludge – Green Fuels makes competition shortlist

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The possibility of making low-carbon jet fuel from sewage is now a little closer.
Subject to final confirmation of grant awards, Green Fuels Research, a pioneer in sustainable aviation fuel (SAF), said its FIREFLY project has been selected as one of eight industry-led projects shortlisted to receive a share of £15 million (€17.5 million) in the Department for Transport’s Green Fuels, Green Skies competition.
FIREFLY, a joint endeavour between GFR, Petrofac and Cranfield University, will demonstrate an integrated technology route to SAF using sewage sludge as feedstock, addressing a market opportunity and unmet need.
The project encompasses engineering design and construction of a demonstrator plant in Berkeley, UK, capable of generating the quantities of fuel to allow certification.
This in turn will lead to a first-of-a-kind commercial refinery and roll-out to several UK locations where airports, pipeline terminals and wastewater treatment works are in close proximity.
According to the Biosolids Assurance Scheme, around 53 million tonnes per annum of untreated sewage sludge are collected in the UK from about 8,500 wastewater treatment works servicing small villages to large cities.
Green Fuels CEO James Hygate said: “We’re delighted to have this opportunity to prove the environmental and commercial viability of the FIREFLY route, which integrates several existing technologies into a sustainable industrial process. Among many advantages, FIREFLY will use fully biogenic feedstock which will emit no fossil carbon, won’t contribute to deforestation or compete with food production and will not rely on imports with long, high-emission supply chains.”
New fuels such as hydrogen are years away from reality, explained Hygate, and would need completely new engine and airframe systems to be adopted by the notably risk-averse aviation industry.
“Liquid hydrocarbon fuels, that require no modification to propulsion systems or delivery infrastructure, are the only realistic option to decarbonise aviation in the near future, which is when it has to happen,” he concluded. “The good news is that we have several routes already available, and our FIREFLY project will add another. What we need is a strong mandate encouraging the use of sustainable aviation fuels.”
For Petrofac, Chief Operating Officer John Pearson said: “The UK has the third largest aviation network in the world. As a key component of the economy, providing sustainable aviation fuels is one of the main pathways to help the UK achieve net zero targets.
“By designing this initial demonstration plant, we hope that together with Green Fuels and their partners, we can demonstrate a commercially viable and scalable route for future projects that will enable the aviation sector to decarbonise.”