Dissolved Air Flotation is playing an increasingly important role in seawater desalination pre-treatment particularly for reverse osmosis membrane systems because it is effective in removing algae, a challenge in the seawater desalination process. Today in the desalination industry, there is a constant demand for innovation, improved reliability and reduce CAPEX and OPEX. By bringing together the expertise of KWI, a specialist in pre-treatment by flotation, and ItN, a specialist in ceramic ultrafiltration, we offer an innovative and economical combination.
Outlet turbidity less than 1 NTU
TSS removal efficiency: 95%-99%
High hydraulic load: maximum 25 m3/(m2·h)
High algae removal efficiency: 95%-98%
High sludge concentration: max. 5% of solid content
Only seawater resistant materials
Low energy and chemicals consumption (High-efficiency DAF)
The DAF system will usually be installed downstream of the seawater intake screens and upstream of the Dual Media/ UF filtration plant.
For large flows, KWI offers the Unicell BF for installation in concrete basins, with our maximum flow being 3000 m3/hr per DAF cell
KWI also offers a combined DAF filtration system Flotofilter
Both the Unicell BF and Flotofilter can be installed in concrete basins
Air Flotation is one of the most successful processes for handling both algae and suspended solids and will contribute to the reduction of organic materials being carried forward to the RO membranes. KWI has broad expertise in supplying both package and large DAF systems to desalination plants in the Middle East, South America and Asia.
Combining DAF with ceramic UF is the best KWI pre-treatment combination for seawater desalination that can effectively remove biological, organic and other particulate contaminants, which, if left untreated, can result in problems such as biofouling on RO membrane surface. A unique process combination of DAF and ceramic membranes can extend the RO membrane lifespan to 8 years or more. Effluent water SDI can reach below 2.