Dispersed oil may be efficiently removed from contaminated water by means of flotation, i.e. injecting a suitable amount of gas. Usually air is used but when oxygen should not be added to the water to limit corrosion or to avoid potentially explosive gas mixtures, nitrogen or fuel gas can be selected as an injection medium.
Unidro has the know-how to size, design and fabricate different type of flotation units.
Induced Gas Flotation IGF/IAF
Both turbine type and ejector type flotation units are available.
These units are mostly applied for treating produced water when a coarse deoiling is required. Unidro’s IGFs are efficient and simple and can treat large flow rates.
Dissolved air flotation is very effective in removing fine dispersed oil and light suspended solids. Their applications are found in refinery oily water treatment, biologically treated effluents, produced water treatment and open drains. The system includes a gas saturation vessel and recirculation pump. We have rectangular or circular DAF tanks in concrete or steel.
Increasingly stringent environmental discharge requirements plus the constant pressure to reduce equipment footprint have led to the development of the Compact Flotation Unit (CFU). Unidro has brought their experience on traditional flotation units forward to match this new challenge as well.
The complete equipment including the vessels, ejectors, distributors and skimmers as well as the structural internal parts are manufactured and assembled in our certified fabrication shop. Our fabrication facilities are qualified by National Board and we have U-Stamp certification. The extent of shop pre-assembly is evaluated case by case, with our customers.