Along the A2 highway, near Elsloo, two imposing tanks recently towered above the landscape. The construction of these collection tanks marks an important milestone in the OASE project. With the installation of the roofs, the highest point has been reached, bringing us one step closer to more effective water treatment at Chemelot.
Building blocks for sustainable water treatment
The OASE project focuses on improved water management thanks to the construction of new collection tanks and additional treatment steps for process water. With these innovations, Chemelot continues to lead the way in the treatment of process water, providing the site with cleaner and more effective water treatment. With a storage capacity of 12,500 m³ per tank, the two giant tanks together can store as much water as four Olympic-sized swimming pools. These tanks are specifically designed to buffer water flows at Chemelot.
Earlier this year, the foundation was laid by pouring about 1.6 million liters of concrete, incorporating 250 kilometers of reinforcing steel. Since then, there has been intensive construction of the collection tanks. The progress is visible, tangible and downright impressive.
Precision work on a giant scale
Installing the roof structure was a technically complex operation. With a weight of 54 tons and a diameter of 34 meters, the lifting work required extreme precision and seamless cooperation between all parties involved.
Ready for the next step
Completion work for the collection tanks is underway. Pumps, piping and process control equipment are being connected, stairs and railings are being installed, and finally a protective coating is being applied. This is a prelude to the next phase: the renovation of the 65-year-old existing storage and settlement basin. Demolition of this sedimentation and filtration plant will begin in 2026, after which a modern replacement of approximately 18,000 m³ will take its place with a renewed sand trap and drum screen. With this, the water going to the IAZI (Integrated Wastewater Treatment Plant) will be even better pre-treated. An important step in protecting the Ur’s water quality. A river connected to the Maas and essential for the drinking water supply of millions of people.
A cleaner environment for the future
Behind the OASE project is more than concrete and steel. It is a strategic investment in the future for Chemelot. It improves the pretreatment of wastewater before it finds its way to the IAZI. This responds to both the strict discharge permit issued by Waterschap Limburg and Chemelot’s broader ambition to be fully circular and climate neutral in 2050.
In the coming period, under the leadership of Circle Infra Partners and in close cooperation with Haskoning and BLM Industrial Contracting, the project will continue to evolve. Together we are working on technical optimizations, with safety as an absolute top priority in every project phase. One thing is now certain: with the highest point reached, the project is firmly on course.
For more information and regular updates on the project, follow Chemelot and Circle Infra Partners’ social media and website. If you have any questions about the project, please contact the project partners at communicatie@circleinfra.com.