Can your Dissolved Air Flotation systems handle fluctuating flow rates?

Yes, flotation systems like NPF-HX, HRC –DAF, VAL and FlooDAF® are designed to handle fluctuations in influent flow and solids loading, delivering robust and consistent performance across a wide range of operating conditions.

How do I choose the right DAF solution for my site?

Our experienced engineering team will assess your wastewater characteristics, hydraulic conditions and available footprint to identify the optimal DAF solution for your application. Pilot testing, on-site jar testing, and laboratory analysis are available to verify process performance and optimize the final design.

Dissolved Air Flotation solutions (DAF) for water and wastewater treatment

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?

High rate i-DAF

Nijhuis IPF & NPF with (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.

Our solutions

Municipal
Industrial

DAF – High rate concrete i-DAF

Industrial water
Drinking water
Wastewater

Concrete i-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, it’s (...)

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 – IPF-NPF

Wastewater
Drinking water
Industrial water

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

Municipal
Industrial

DAF – GDF

Wastewater
Drinking water
Industrial water
Sludge

The NSI GDF unit is high-performance Dissolved Air Flotation (DAF) system designed to separate suspended solids, oils, greases, and flocculated particles from industrial and municipal (...)

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.

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.

Dissolved Air Flotation solutions (DAF)