dws-rhdhv-nereda-rwzi-utrecht-aerial-770pxDutch constructors Heijmans and GMB have been contracted by water board De Stichtse Rijnlanden to build a new municipal waste water treatment plant in Utrecht.

The project comprises the design, construction and 10-year maintenance of the plant. The DBM-contract (design, build, maintenance) is valued at over 120 million euro.

With an average capacity of 430.000 population equivalent and 64.400 m3/day it will be the largest Nereda plant in the Netherlands.

The installation will be designed to handle a peak flow of 13.200 m3 per hour.

dws-rhdhv-nereda-rwzi-utrecht-lay-out-muct-350px Reduced space (marked in grey) for the mUCT technology that was considered as an alternative. dws-rhdhv-nereda-rwzi-utrecht-lay-out-nereda-350pxReduced space with Nereda-technology that does not require large settling tanks.

Stringent effluent criteria
Heijmans-GMB were awarded the contract by De Stichtse Rijnlanden on the basis of its choice for a compact plant that makes use of Nereda technology to purify the municipal waste water, meeting stringent effluent requirement.

Two important effluent parameters are for nitrogen (Ntotal: 5 mg/l) and phosphate (Ptotal: 0,5 mg/l).

Ten-year maintenance
Construction work to rebuild the current obsolete wwtp (on top photo) that was built in 1959, will commence in 2017. Project completion is scheduled for the beginning of 2019, after which the 10-year maintenance period will commence.

The new wwtp will remove twice as much nitrogen and phosphate from the water, and is 30 per cent more energy efficient compared to the current plant.

The existing plant will be removed from service once the new plant has been commissioned.

Big step scaling up Nereda technology
For supplier Royal HaskoningDHV it will be an important new step in scaling up its Nereda technology. The biggest Nereda-plant in the Netherlands at this moment is wwtp Gamerswolde with an average daily flow of 30.000 m3 and a calculated capacity of 140.000 p.e.

In the Netherlands nine Nereda-plants are currently operational of which four are municipal and five industrial.

Under design in Brasil is even a larger Nereda plant. Next year the Nereda installation at wwtp Jaboatao, Recifi will be commissioned and will have a daily average flow of 109.683 m3 and 858.333 p.e.

This news item is based on an original publication at the websites of GMB (in Dutch only) and Heijmans.

Read also on this website
Construction of first Nereda waste water treatment plant in Switzerland about to start, 4 February 2016
● Royal HaskoningDHV increases market access for its Nereda technology in Spain, Portugal and South Africa, 2 December 2015
● First of three Nereda wastewater treatment plants in Ireland took flow, 10 September 2015
● Royal HaskoningDHV's Nereda waste water technology selected for expansion wwtp Hartebeestfontein, South Africa, 28 April 2015

More information
Royal HaskoningDHV
Amersfoort, the Netherlands
+31 88 348 20 00

Rosmalen, the Netherlands
+31 73 543 5111

Opheusden, the Netherlands
+31 88 88 54 000