New construction and new construction of WWTP Zeist with the ambition to realize the WWTP as a sustainable and circular purification using the Verdygo system, among other things. Within a construction team, the preliminary design that has already been drawn up will be developed into a final design. The contractor will then be responsible for the elaboration of an implementation design.

A choice has already been made for the Nereda® technology. Within the construction team, Royal HaskoningDHV will sit at the table as a construction team partner and will provide the knowledge and input for the Nereda® technology. Upon realization, she will be responsible for the Nereda® internals. Additional agreements will be made about this during the construction team phase. The contractor must bring the necessary knowledge and skills to further design the purification and integrate the Nereda® technology.

Publication of the assignment is scheduled for May 15, 2023. The new treatment plant must be in operation by the end of 2027 at the latest.

Concerns the design (other than Nereda®), the structural, civil, mechanical, electrical and control work for the WWTP, with the following main process components:

- Roostergoedverwijdering:

- Zandverwijdering;

- Fine sieve installation with sieve processing;

- Nereda® installation with buffer tanks;

- Zandfiltratie;

- Medicijnrestenverwijdering;

- Slibindikking;

- Company building;

- Terreininrichting.