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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 architectural and structural design, civil works and the installation of advanced thermal treatment systems. BESIX oversees the entire process from design and construction to financing, operation and maintenance, working closely with Indaver, which contributes its waste treatment and energy recovery know-how.
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 incorporates energy recovery systems such as steam expansion turbines and power generation units. 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: Steam supplied to ArcelorMittal Belgium for industrial 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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