Intelligent Wastewater Chemical Dosing - Nijhuis i-DOSE

Reduce water treatment chemicals

To effectively remove solids, COD, NO3-N and PO4-P from wastewater, chemical dosing units, pumps and systems are often applied and needed to comply with the effluent discharge requirements. However, a fixed chemical dosing for wastewater treatment is in general not sophisticated enough to handle the actual day-to-day fluctuations in the wastewater and this can cause additional chemical and energy costs.

For example for primary wastewater treatment, the COD load in the balance tank increases during production hours and decreases during cleaning. By using an intelligent wastewater chemical dosing system, costs for water treatment chemicals for coagulation, flocculation and neutralization can be substantially reduced. The wastewater process can deal more easily with fluctuations in pollution load.

About i-DOSE
Nijhuis Industries has designed the “i-DOSE” system to comply with this real-time control process for chemical treatment of wastewater, significantly reducing wastewater operational costs (e.g. chemicals, aeration, energy). The system also allows facilities to be operated at a maximum performance with reduced operator’s presence due to the intelligent dosing philosophy. As well as our existing and proven i-DOSE pre-treatment applications, i-DOSE can also be applied within secondary and tertiary water and wastewater treatments.

Principle of i-DOSE
The i-DOSE philosophy is based on analyzing, controlling and dosing the correct amount of utilities (e.g. chemicals) based on the real-time pollution in the wastewater. The Nijhuis i-DOSE consists of a UV-vis spectrometer, control & algorithm, monitoring system and automatic cleaning mechanism.

  • i-DOSE
  • i-DOSE-Circle

Real-time dosing has many benefits, not only reducing chemicals


  • Simple, safe and plug-and-play design
  • Empowered with automatic cleaning mechanism
  • Real-time control of the process
  • Robust system


  • Up to 30% savings on wastewater chemical consumption
  • Up to 4 hours savings on additional operator’s presence per week
  • Lowest possible maintenance cost due to automatic cleaning process
  • Provides peace of mind


  • Always compliant to effluent requirements
  • Allows insight into trends of operation
  • More process knowledge and operational stability


Pre-treatment - Savings on chemical consumption

Rapid COD measurement for coagulant dosing control

Typical benefits

  1. Avoid overdosing of chemicals.
  2. Reduce chemical consumption costs up to 30%
  3. Better performance of flotation system.
  4. Always compliant, stable effluent.
  5. Robust measurement system.
  6. Reduced balance tank footprint.
  7. Reduced chemical sludge production.
  • i-DOSE-Visual1

Secondary treatment - Savings on aeration and energy

Rapid BOD/TSS, NO3-N measurement for denitrification control

Typical benefits

  1. Controlled (de)nitrification, savings on aeration and energy.
  2. Always compliant, stable effluent.
  3. Stable nutrient balance, savings on additional nutrients.
  4. Peace of mind.
  • i-DOSE-Visual2

Tertiary treatment - Always compliant to effluent requirements

Rapid COD, TSS, or PO4 measurement control

Typical benefits

  1. Always compliant, stable effluent.
  2. Well-monitored, optimal treatment performance.
  3. Always dosing the right amount of chemicals.
  • i-DOSE-Visual3

Let us implement your intelligent wastewater chemical system with the lowest possible chemical consumption!

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