Seawater pretreatment solution for desalination (The Wave)

Project’s context & challenges

The Wave Desalination Plant is one of Abu Dhabi’s flagship desalination developments, designed to provide a reliable source of freshwater for the region. To support large-scale seawater desalination, the project required an advanced pretreatment solution capable of handling fluctuating seawater conditions while ensuring consistent water quality for downstream membrane filtration.

Seawater quality can vary significantly due to seasonal algal blooms, suspended solids, and changing environmental conditions. Without effective pretreatment, these fluctuations can reduce reverse osmosis membrane performance, increase maintenance requirements, and drive up operating costs.

To address these challenges, The Wave selected Nijhuis Saur Industries to deliver a high-performance High-Rate Dissolved Air Flotation (HR-DAF) pretreatment system. The solution was designed to provide robust solids removal, protect critical membrane assets, and support reliable freshwater production at a treatment capacity exceeding 110 million imperial gallons per day (approximately 500,000 m³/day).

Key figures

500,000 m³

Pretreatment capacity/day

Up to 30%

Energy savings potential compared to conventional systems

Solution

Nijhuis Saur Industries supplied a High-Rate Concrete i-DAF (HR-DAF) pretreatment system specifically engineered for large-scale desalination applications.

The solution combines patented clog-free aeration technology with an integrated plate pack design to generate fine air bubbles that efficiently separate suspended solids, algae, and flocculated particles from seawater. This advanced separation process ensures stable feed water quality for downstream reverse osmosis systems while minimizing operational risks.

Designed with a compact footprint and optimized hydraulic performance, the HR-DAF system delivers reliable pretreatment performance under changing seawater conditions and supports efficient, sustainable desalination operations.

Customer benefits

Reliable seawater pretreatment at large scale

The HR-DAF system delivers efficient removal of suspended solids, algae, and other contaminants from seawater, ensuring consistent feed water quality for downstream desalination processes.

Enhanced membrane protection

By removing particles before membrane filtration, the system significantly reduces membrane fouling, extends membrane life, and lowers maintenance requirements.

Compact and efficient design

The high-rate technology minimizes footprint and civil construction requirements while maintaining excellent treatment performance, making it ideal for large-capacity desalination plants.

Reduced maintenance and improved reliability

The patented clog-free aeration system reduces operational interruptions and maintenance needs, enabling reliable performance even under varying seawater conditions.

Improved sustainability and energy efficiency

Compared with conventional pretreatment technologies, the solution can contribute to up to 30% energy savings for the overall desalination facility, helping reduce operating costs and environmental impact.