Project approach

Nijhuis has developed a contract staircase model to offer different contract forms to our customers. The staircase consist of design (D) – build (B) - finance (F) – operate (O) and -maintain (M) services to completely match your requirements. In this respect we offer turnkey, lumps sum and open book contracts.

With each of these steps your total cost of ownership will be lowered by enhancing our involvement and offering operational excellence, expertise and specifications. The project execution is performed with a multi-disciplinary team based on our added value services. By this means we can guarantee solution performances and operational consumables, minimizing customer surprises during installation operations.

  • Opstart-bio-Azomures
  • Customer-WWTP

The Nijhuis Contract staircase


  • Design responsibility Nijhuis Industries. The following added values services can be applied:
    • Project management and engineering.
    • Manufacturing and procurement.
    • Inspection, packing and delivery on site.
    • Installation and commissioning.
DESIGN and BUILD (including above items)
  • Turn-key solution.

DESIGN, BUILD and MAINTAIN (including above items):

  • i-ACADEMY (for operators and managers).
  • 24/7 support.
  • Online monitoring (i-MONITORING) and process control (i-CONTROL).
  • Low risk of process failure.
  • Preventive or risk based maintenance
  • On stock low cost spare parts with fast track delivery time

DESIGN, BUILD, MAINTAIN and OPERATE (including above items):

  • Operational excellence.
  • Low usage of consumables like chemicals and energy.
  • Reduce personal cost.
  • Low risk operational mistake.
  • Low sludge production.

DESIGN, BUILD, MAINTAIN, OPERATE and FINANCE (including above items):

  • Financial flexibility.
  • Possible extended CAPITAL expenses.
  • Lower interest rates.
  • Lower CAPEX by Nijhuis standard specifications.
  • Clarifier-kleiner
  • Overview-Nijhuis-lab

Added value services

We have dedicated and specialized teams with extensive experience in designing, developing and implementing our mostly in-house developed products andtechnologies. For example, oil-water separators, dissolved air flotation (DAF) and dissolved gas flotation (DGF) units, biological treatment systems (like BIOCTOR and AECOMIXTM), recycling, disinfection and sludge dewatering systems can be supplied as single units, integrated overall solutions or containerized installations according to specific and local requirements.

Our experienced Research and Development technologists are continuously working on the development of game-changing solutions for purifying (waste)water and recovering valuable resources. We perform a wide variety of tests executed in our state-of-the-art equipped laboratory often supported by pilot trials on-site.

Our in-house design and consultancy support team has extensive experience undertaking all types of water, wastewater, planning support, flood risk, construction, architectural design and other environmental consultancy work.

Our team of experienced project managers is responsible for meeting the objectives of the project in close relationship with our clients and the project team based on a fast-track approach.

Nijhuis Industries provides the most sophisticated manufacturing workshop, securing our customers with the highest quality against a competitive price for standardized products and international standards like ATEX, Norsok or custom-made designs.

  • Manufacturing
  • Inspection-flocculator

Before the equipment leaves the manufacturing facility the equipment is thoroughly inspected. The quality inspection records are reviewed by our quality controllers to comply to the Nijhuis standards and/or your standards.


Installation and commissioning activities are executed according to the agreements in the contract. The civil construction works phase can start during different stages of the project depending on the ground conditions, equipment supply and planning.