[ Filter Flotators ]
The Process Principle
Dispersed oil may be efficiently removed from water by means of flotation, i.e. by injecting a suitable amount of gas (usually air however, should oxygen not to be added to the treated fluid to limit corrosion then fuel gas or inert gas (nitrogen) can be used instead).
Depending upon the method used to inject gas into the water stream, we may have Dissolved Gas Flotators (DGF) or Induced Gas Flotators (IGF), the latter being less effective but easier to operate and more widely used for Produced Water Treatment.
Unidro IGF technology include alternatively the use of injectors or turbines to mix the gas into the water. Both systems being reliable and efficiency proven, the choice to be made considering the conditions at site (type, quantity and conditions of the available gas, disposal facilities for the used gas such as flare, safe location and so on).
Unidro IGF turbine technology
Unidro IGF turbine flotators are horizontal equipment, either cylindrical pressure vessels or atmospheric type tanks, depending upon the case.
Each flotator is a multiple cells unit; each cell equipped with a gas turbine which is designed and sized to inject the necessary amount of gas into the stream and with a special skimming device which removes continuously the floated foam (which includes the oil and the other contaminants removed by the flotation process) and convey it to disposal.
The cells are arranged in sequence in such a way that the process stream flows from on to the next through the IGF multiple step process.
Several parameters affect the unit’s performance and require a careful design and a sound experience with the different fluids. Namely:
The unit geometry to assure a proper hydraulic and fluidodynamic to the system.
The turbine energetic design to ensure the required gas induction into the water stream.
The efficient foam removal in order to prevent contaminants carryover and to minimise the waste to be disposed.
A proper chemical conditioning is normally required to improve the system efficiency.
Unidro IGF has been successfully applied to several industrial applications, from oily refinery waste water to produced water.
We design and fabricate our IGF equipment in our shop according to the applicable international codes as well as in full compliance to any individual project specification or requirement, U-Stamped if required.
Complete filtration package
Unidro scope of supply can be limited to the IGF equipment (vessel with internals) or, more frequently, includes the complete flotation unit or treatment package (multiple units with interconnecting piping, chemical dosing, instruments, control system). The system may be fully assembled on skid and ready to be installed.
Both in case of individual equipment or complete package, all items including filter vessels, tanks, piping, skids are completely manufactured and assembled in our shop.
After sales service
Selecting our filtration systems each End User gets the guarantee of a complete after sales service which includes
the supply of consumables and spare parts for the whole lifetime of the equipment
our technical assistance for maintenance or upgrading the package
a prompt troubleshooting service by our field engineers available worldwide.
