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Aquafin sludge mono-treatment plant
Project overview
The facility is located on the ArcelorMittal Belgium site in the Port of Ghent. The steam generated from sludge treatment will feed ArcelorMittal’s internal network as an additional energy source. This project plays a key role in Aquafin’s ‘road-to-zero’ strategy, which aims to cut emissions by 48% by 2030, and contributes to the Port of Ghent’s carbon-neutral ambitions. This dual energy recovery will avoid 28,000 tonnes of CO₂ emissions annually.
Scope of works
The project covers the full DBFMO cycle, combining design, engineering, and operational expertise. Through the FOSTER consortium, BESIX and Indaver manage the complete design scope (architectural, structural, MEP, and PMEICA). FOSTER coordinates all trades, each of which is carried out by a different subcontractor.
Technical features
The facility includes a 40-metre-high monolithic sludge bunker built using slipform techniques, a production hall housing the thermal treatment unit and an advanced gas purification system, as well as a tipping hall. Precision engineering ensures safe high-temperature operations and compliance with strict environmental standards. The project also delivers high pressure steam to the neighbouring plot where Finarmit (JV between Arcelor Mittal Belgium and Fineg) are building the expansion turbine which will generate power and take off the steam. FOSTER will then operate and maintain the plant for 20 years to guarantee performance and reliability.
Key highlights
Circular economy impact: Converts sewage sludge into renewable energy and raw materials
CO₂ reduction: 28,000 tonnes CO₂-equivalent avoided annually
Energy valorisation: High-pressure steam powers Finarmit, low-pressure steam then feeds ArcelorMittal’s processes
Future-ready: Planned phosphorus recovery to reduce dependency on imported resources
Public-Private Partnership: BESIX and Indaver combine expertise for long-term success
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