PekaKroef partnership

Odiliapeel, The Netherlands
1993 - present

Capacity: 2,880 m3/d   


Anaerobic purification UASB: 2.600 m³


Biogas production: 2 million Nm3/year


Biogas treatment: 3,000 ppm to <200 ppm


Electricity production: 10,000,000 kWh (e) per year


Heat production: 11,000,000 kWh (th) per year


Phosphate recovery: 1,200 tonnes per year


Water for reuse: 90,000 m3 per year

Water treatment screening
Discharge permit
Environmental permits
Environmental management system
Soil survey
Partial remediation
Phosphate removal
Nitrogen removal
Residual streams
Anaerobic reactor UASB
Reuse of wastewater
Boiler feed water
Sand separation

Project description

Colsen has been working with PekaKroef since 1993, when it started supporting the latter’s water treatment efforts. Colsen began with water treatment processes, in addition to work on both the internal and external sewer systems, as well as consulting on discharge permits and environmental permits. In recent yeras, Colsen regularly assisted PekaKroef in procedures relating to environmental permits.

The two parties set up the environment management system together and jointly work on supporting and implementing said system. In the context of soil quality, Colsen carried out soil surveys and oversaw partial remediation during construction projects.

Thanks to the progressive, innovative characters of both companies, plans were developed, prepared and realised for water reuse, residual stream digestion and biogas desulphurisation. The innovative nature of this partnership was also expressed by means of various pilot tests and research projects.

The close partnership between PekaKroef and Colsen has since led to various consultancy projects. The renewed water treatment system (2006 / 2006) was realised by a construction team, with Colsen acting as the technology supplier and engineering agency.

WWTP realization

Prior to commencing work, the current system was screened and the quality of the wastewater was thoroughly tested. After quickly identifying a key issue, measures were taken to regain control over the treatment process, which involved ensuring better removal of suspended matter and the separation of several wastewater streams.

Over the years, the water treatment system was expanded with a focus on nitrogen and phosphate removal, energy production and water reuse. Aided by various proprietary technologies, we sought to minimise operating costs, whilst retaining a high degree of flexibility - as the plant remained up & running while the new treatment system was being built.

The following system components were realised with a view to water treatment:

  • Realisation of a central sewerage well with drilled sewerage under the production floor
  • Installation of sieve bends with silos for residual streams
  • Expansion of the Dortmund system for grey starch separation
  • Realisation of 2 new anaerobic UASB reactors
  • Realisation of biological biogas desulphurisation (BIDOX®) system
  • Realisation of renewable energy production with a CHP system
  • Modification of existing steam boiler in order for it to run on biogas
  • Realisation of a washing water treatment system and return system to the potato washing section
  • Realisation of improved mixed sewerage system with disposal sewer
  • Realisation of phosphate removal / struvite-based phosphate recovery (ANPHOS®) system
  • Conversion of aerobic treatment system to NT/DNT with retractable bubble aeration system
  • Conversion of conventional water treatment system to a membrane system (MBR)
  • Realisation of a sludge thickener
  • Realisation of a reverse osmosis (RO) system to enable the reuse of boiler feed water (RO-RECYCLE®)
PekaKroef installatie
PekaKroef installatie

Would you like to know more?
Ask Eric

Eric van den Branden, Head of Consultancy Department / Permit Advisor / Environmental Management