Can the systems be customized for my site?

Yes! Concrete i-DAF units are modular and can be tailored in size and capacity to meet specific project needs.

What is the maximum capacity per unit?

Depending on the model, Concrete i-DAF can handle up to 3,230 m³/h per unit.

DAF – High rate concrete i-DAF - High Rate Dissolved Air Flotation System- Nijhuis Saur Industries

Your challenges

Maximizing treatment performance and operational flexibility in limited spaces.

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Limited Space for Treatment Infrastructure

Urban and industrial sites often lack the space for large water treatment systems. Concrete i-DAF's compact design and high hydraulic loading rate (>40 m³/m²/h) allow for efficient treatment in tight spaces.

High Operational Costs and Maintenance

Traditional systems suffer from clogging and frequent maintenance. Concrete i-DAF uses a clog-free aeration system and smart effluent valve to reduce downtime and operational expenses.

Inconsistent Water Quality

Fluctuating flows and variable water sources can affect treatment results. Concrete i-DAF maintains consistent water levels and uses advances skimming and plate pack technology to ensure high effluent quality.

Do you want to know more about the NSI High-Rate DAF?

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How does it work ?

The NSI high rate concrete i-DAF is a dissolved air flotation system designed to efficiently separate suspended solids, fats, oils, and grease from water, even under fluctuating flow conditions based on the unparalleled ‘Nijhuis dissolved air flotation’ expertise.

The process

The NSI high rate concrete i-DAF is engineered using a combination of patented and optimized components:

Clog-Free Aeration system: The aeration tube mixes pressurized water and air in a special zone, producing fine bubbles (30-60 microns) that lift solids to the surface. This design clogging and reduces maintenance.
Integrated plate pack: The plate pack increases the effective surface area and maintains stable laminar flow, enhancing separation performance and reducing pollution in the effluent.
3-wheel skimmer: The skimmer gently handles the floatation layer with minimal backflow, ensuring optimal sludge removal. It’s available in corrosion – resistant materials for seawater application.
Smart effluent valve: This intelligence valve keeps water levels stable even under changing flow conditions. It also allows full removal of the floating layer before shutdown, minimizing sedimentation and improving cleaning efficiency.

Our positive impact

The NSI HR-DAF combines wide applicability with high-quality effluent, clog-free aeration, operational flexibility, enhanced sludge removal, and a compact design that delivers superior separation performance at reduced footprint and cost.

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Widely applicable

Applicable to large-scale desalination, drinking water and wastewater treatment plants.

High-quality effluent

Delivering clean, high-quality effluent while minimizing operational costs and footprint.

Clog-free aeration

Patented clog-free aeration generates fine 30–60 micron bubbles, preventing clogging, reducing maintenance, and ensuring continuous, reliable operation.

Operational flexibility

A smart effluent valve keeps the water level constant under fluctuating flows, allowing complete flotation layer removal before shutdown.

Enhanced sludge removal

The unique 3-wheel skimmer system ensures efficient and gentle removal of flotation sludge, improving sludge handling and effluent quality.

Reduced footprint & improved separation

The integrated platepack increases the effective separation area, enabling hydraulic loading rates over 40 m³/m²/h, outperforming typical dissolved air flotation systems in a smaller space.

Key figures

3230 m³/h | 853,000 gal/h

max capacity per unit

> 40 m³/m²/h

Hydraulic loading rate

30–60 microns

Bubble size

"The NSI high rate concrete i-DAF is a compact, scalable, and clog-free flotation solution that combines operational flexibility with outstanding separation performance. "

NSI high rate concrete i-DAF