Facts & Figures

 ClientWaterschap Vechtstromen
 LocationVriezenveen, The Netherlands
 Operation Start2021
 Project TypeGreenfield
 Process ConfigurationPre-treatment + Nereda
 Nereda Design Capacity:
  • Dry Weather Flow2 MLD
  • Peak Flow1,005 m3/h
  • PE13,500 PE (PE = 60 gBOD/d)
 In the Media:Nieuwe Nereda Installatie Vriezenveen



Vriezenveen is a town in the Dutch province of Overijssel. It is located in the municipality of Twenterand, about 7km north of Almelo in the Netherlands.


The upgrade of the municipal wastewater treatment plant (WWTP) at Vriezenveen in the Netherlands marks another chapter in the Nereda story. The plant serves a population equivalent of 13,500 people with equipment and technology that dates from the 1970s. Following the success of the hybrid Nereda plant in Vroomshoop, Royal HaskoningDHV has been engaged to build the second Nereda treatment plant for the Vechtstromen water authority at this site.


Water Board Vechtstromen is an innovative organisation and attaches great importance to the recovery of energy and raw materials from wastewater. The 1970s purification system will be replaced by a sustainable, modern installation that can easily be adjusted online via an Aquasuite Nereda Controller. The basic operation of the original process and the new Nereda installation will be largely the same, with dirty sewage water broken down and cleaned by billions of bacteria. However, only two Nereda reactors of 1700 m³ will be installed at Vriezenveen, which simplifies and accelerates the purification process. This saves on the site space required, because the aerobic bacteria form compact mud granules, allowing several treatment steps to be completed simultaneously.


Compared to the old installation, the new treatment process reactors will occupy less than half of the original site. The new installation will have the capability to extract more raw materials from the sewage water produced by 13,500 people, against lower operational and energy costs. Running at peak flow, the site can process 1000 m³/hour with a capacity of 24 MLD. The Nereda plant will be operational and begin purifying wastewater from Vriezenveen from mid-2020 onwards.

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The local benefits of the project

Nereda logo small Updated technology to meet current standards
Nereda logo small Accelerated process
Nereda logo small Higher-quality effluent 
Nereda logo small Automated adjustable control
Nereda logo small  Increased capacity