Industrial Wastewater Treatment
Induced Gas Flotation (IGF) Filter
World Technologies delivers Induced Gas Flotation (IGF) Filter solutions, equipment and lifecycle support for reliable industrial water and wastewater operations in Singapore and the region.
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Induced Gas Flotation (IGF) Filter
Induced Gas floatation is one of the various technologies available for the removal of oily particles contained in produced water. The main purpose of the IGF unit is to separate free oil from water. In this equipment, fuel gas is induced in the oily water in the form of tiny bubbles which are generated from a pumping device. The tiny bubbles attach to suspended oil droplets causing them to float.
This unit is a dispersed gas and coalescing produced water clarifier. It operates by dispersing natural gas as fine bubbles into the produced water stream using a differential pressure induction system. Recirculation pumps pressurize the water manifold supplying the Venturi eductors. As the pressurized water flows through the Venturi eductors, gas is induced and mixed into the water. The water-gas mixture is ejected from the bottom of the Venturi eductors, producing small bubbles that rise through the effluent, stripping entrained oil. The gas-rich effluent then flows through coalescing screens, enhancing oil removal. The stripped oil rises to the surface as froth, which is propelled over the oil bucket-skimming weir by internal vessel hydraulics.
The unit includes two electric motor-driven produced water recirculation pumps, circulating flow based on the inflow rate. There are also two double diaphragm pumps for the recovered oil condensate, transporting it to the wet oil tank or heater treater. The system utilizes Venturi Eductor assemblies, which are accessible through the water manifold top. Each assembly consists of an upper and lower eductor tube, a Venturi nozzle, and a static mixer, all of which are easily removable.
Optional Coalescer Pack Equipped IGF
To aid the separation process the IGF is equipped with coalescer packs and diverter plates. Usually, IGF vessels are internally broken down into compartments with each compartments consisting of eductors, coalecser pack and diverter plate. The IGF is also equipped with a deflector plate and an oil bucket. See IGF internal layout drawing for further visual clarification.
1. Diverter Plates
These plates seperate the IGF compartments. Each separation compartment consists of a pair of eductors and a coalescer pack. The diverter plates not only separate the compartments but also allow the fluid to flow in a predetermined manner. This increases the retention time which aides the proper removal of the free oil particles.
2. Eductors
The eductors are static jet pumps which uses water as a motive force to induce gas bubbles into the oily water. The bubbles assist the oil particles to coalesce to form bigger particle which float to the surface to form an oil film.
3. Coalescer Pack
Each compartment has a coalescer pack to further assist the formation of larger oil particles. The pack achieves this by increasing the contact surface area of the fluid thus allowing more free oil particles to come together. There are several types of coalescer packs. The plate type is used for this project.
4. Deflector Plate
The deflector plate is installed in the vessel with an inclination to force the oil film into the oil bucket. Since oil will float on water restricting the oil film to a portion will create a thicker oil film which can be skimmed into the oil bucket.
WTPL’s designed and manufactured IGF units provide:
- Customized and Standard Packages
- Vertical and Horizontal Options
- ASME coded vessels
- Minimal or no moving parts
- Optional coagulant chemical injection
- Optional impeller or sparger design – Skid mounted packages
- Can deliver as low as 10 ppm
- Oil in water concentration
Frequently Asked Questions
What is Induced Gas Flotation (IGF) Filter and how does it work?
Induced Gas Flotation (IGF) Filter is an engineered water or wastewater treatment process selected to achieve a defined quality, recovery or discharge objective. Its operating principle and treatment stages depend on the application.
What contaminants or water-quality problems can Induced Gas Flotation (IGF) Filter address?
Performance depends on the selected configuration. Water analysis is used to identify suspended solids, dissolved salts, hardness, oil, organics, nutrients, metals or other parameters that the treatment train must control.
How is a Induced Gas Flotation (IGF) Filter system designed and sized?
Design uses flow and load profiles, laboratory analysis, target outlet quality, recovery, operating hours, redundancy, footprint, utilities, sludge or concentrate handling and lifecycle cost.
How much does Induced Gas Flotation (IGF) Filter cost in Singapore?
Cost depends on capacity, feed quality, materials, automation, civil and installation scope, performance requirements and ongoing consumables. A site-specific assessment is needed for a reliable budget.
Can World Technologies upgrade or maintain Induced Gas Flotation (IGF) Filter?
Yes. World Technologies can review existing performance and support suitable upgrades, equipment replacement, commissioning, troubleshooting, consumables and preventive maintenance.