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Your challenges

High levels of suspended solids and FOG

Many industries struggle with wastewater containing large volumes of suspended solids, fats, oils, and grease (FOG), which are difficult to remove with conventional methods. This not only affects compliance but also overloads downstream treatment. A robust flotation solution is essential to reduce these loads efficiently.

Limited space for treatment infrastructure

Urban or industrial sites often face footprint limitations that make conventional sedimentation tanks unfeasible.

Variable flow and contaminant loads

Changing operational conditions, such as seasonal peaks or shifts in production, can drastically alter the characteristics of wastewater. A flotation system must adapt automatically to fluctuating flows and contamination levels without compromising performance.

Sludge handling and disposal costs

Dissolved Air Flotation systems generate sludge with an approx. 7% of dry solids content. When the sludge is not treated, there’s a higher amount of cost of disposal due to the high amount of water.

How can NSI meet your needs?

Nijhuis IPF & NPF (stainless steel flotation basin)

The NPF flotation system uses plate pack technology to maximize separation surface in a compact design. With high overflow rates and solids loading , it offers flotation solution with reliable performance  and space –savings. 

Designed for large industrial flows, the NPF-HX delivers superior capacity with even higher overflow rates and full automatic level control. It is highly adaptable to changing influent hydraulic conditions and wastewater properties.

Nijhuis HRC DAF (reinforced concrete flotation basin)

High Rate Concrete (HRC) DAF is Ideal for large scale drinking water, municipal and industrial applications, it , handles typically  the flows ranging from 1,065 to 3,500 m³/h per bay.  

Nijhuis GDF (stainless steel flotation basin)

GDF flotation is perfect for highly polluted wastewater with significant sludge loadings. It operates at low overflow rates and is highly effective for applications involving activated sludge or emulsified oils. 

FlooDAF® (stainless steel flotation basin)

FlooDAF® achieves high separation efficiency. Its single-level low construction and highly efficient dispersion water system ensure a small footprint and reduced civil works costs. FlooDAF® flotation unit is used for treating high flowrate of wastewater  and  has  good tolerance for hydraulic and influent solid variations, low maintenance requirements, and comprehensive aftermarket care. 

Vacuum Airlift Technology (VAL)

Vacuum Airlift Technology 9VAL) patented by Coldep, uses Vacuum pressure combined with microbubble injection to achieve highly efficient contaminant separation, making it ideal for aquaculture and industrial wastewater applications.

Do you want to know more about the NSI i-DAF Flotation solutions?

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Our solutions

  • Municipal
  • Industrial

DAF – Nijhuis HRC DAF (reinforced concrete flotation basin)

  • Industrial water
  • Drinking water
  • Wastewater

The Nijhuis HRC DAF is a powerful and compact solution for removing solids from water and wastewater. Designed for large flow rates and small loads and built in concrete basins, (...)

  • Municipal
  • Industrial

DAF – FlooDaf®

  • Process water
  • Industrial water
  • Resource Recovery
  • Wastewater
  • Sludge
  • Drinking water

A high-capacity, compact flotation solution for various large-scale water and wastewater treatment applications enabling raw material recovery, decreased water consumption and (...)

  • Municipal
  • Industrial

DAF – Nijhuis IPF-NPF

  • Wastewater
  • Drinking water
  • Industrial water

The Nijhuis NPF and IPF units are advances dissolved air flotation (DAF) systems designed for efficient separation of suspended solids, oils, greases, and flocculated particles (...)

  • Municipal
  • Industrial

DAF – Nijhuis GDF

  • Wastewater
  • Drinking water
  • Industrial water
  • Sludge

The Nijhuis GDF units are high-performance Dissolved Air Flotation (DAF) systems designed to separate suspended solids, oils, greases, and flocculated particles from industrial (...)

  • Municipal
  • Industrial

VAL – Vacuum Air Lift technology

  • Industrial water
  • Wastewater
  • PFAS

To remove suspended particles, concentrate pollutants and regulate dissolved gases in water, the innovative VAL (Vacuum Air Lift Technology) combines vacuum, microbubble flotation (...)

Customer benefits

High removal efficiency

All our DAF units are designed to remove over 90% of suspended solids and Fats, Oils, and Grease (FOG), ensuring compliance with discharge limits and protecting downstream equipment.

Flexible design for any industry

From food processing to municipal treatment, our range of Dissolved Air Flotation systems offers solutions tailored to specific industries, wastewater characteristics, and operational requirements.

Reduced footprint and installation cost

Our plate pack and high-rate systems minimize space requirements, making them ideal for retrofits or installations in areas with limited footprint availability.

Improved sludge management

Our flotation systems enhance sludge management by efficiently handling high solids loads and seamlessly integrating with dewatering systems, thereby reducing sludge handling and transport costs.

Adaptability and automation

Advanced level control and adaptable design allow consistent performance even under variable flow or shock load conditions, reducing operator involvement.

Contact our experts

Contact our experts

Frequently Asked Questions (FAQ)

GDF is an open tank flotation unit designed for highly contaminated water and high solids  loading, whereas IPF and NPF flotation units are equipped with   plate pack technology for compact, efficient separation in low to medium solids-loaded streams.