What is Induced Gas Floatation System?
Induced gas flotation (IGF) is a wastewater treatment procedure that removes suspended particles such as oil or sediments from wastewaters (or other liquids). Gas bubbles are injected into the water or wastewater in a flotation tank or basin to remove the contaminants. The microscopic bubbles cling to the suspended substance, allowing it to float to the wastewater's surface, where it may be skimmed off with a skimming equipment.
Application of oil-water separator systems?
Induced Gas Flotation is widely employed in the treatment of industrial wastewater effluents from oil refineries, petrochemical and chemical plants, natural gas processing plants, and other facilities. Because of the risk of explosion, IGF units in the oil sector do not utilize air as a flotation medium. The bubbles in these IGF Units are created with nitrogen gas.
Despite the fact that Gas Floatation has been shown to be commercially successful in the role of secondary produced wastewater treatment, it has a larger role to play for the following reasons:
1: Produced water volumes from older reservoirs increases.
2: Enhanced oil recovery (EOR) techniques should be used more frequently.
3: Increased output from unconventional deposits such as heavy oil, sand oil, and others.
4: Demand for the re-use of generated water has increased (re-injection, steam generation etc.)
5: Environmental rules are becoming more rigorous all across the world.
Principle of Operation
Induced Gas Flotation Machines (IGFs) are hydraulically powered units that offer effective oil recovery from water streams while maintaining total process containment. The fully contained flotation process ensures operator and environmental safety, allowing for efficient and cost-effective oil recovery.
IGF Units separate and recover oil and tiny solid particles from water by dispersing fine gas bubbles (usually less than 50 microns in diameter) into the entering water stream. Oil and tiny solid particles in the water stream cling to the gas bubbles and rise to the surface, where they are skimmed off.
The formation of tiny gas bubbles (usually less than 50 micron) allows for the effective recovery of small oil droplets in the water stream because:
1: There's a good chance you'll get a bubble/oil attachment,
2: A high concentration of bubbles,
3: Bubbles with a large surface area to volume ratio,
4: There is less turbulence since the bubbles rise slowly,
5: Increased volume of oil and particles eliminated while consuming less gas,
A re-circulating loop is included in the IGF Recirculation systems, where a side-stream of clean water is collected from the IGF Vessel's exit and pushed through an Eductor.The Eductor produces a gas-rich fluid stream of tiny bubbles, which is then returned to the IGF unit and disseminated throughout the water.Induced Gas Flotation can help remove oil and particles by using flocculants or flotation chemicals.
The following are some of the advantages of well planned and executed IGF systems:
1: Chemical usage is minimal or non-existent,
2: Low workforce for operations and maintenance,
3: Oil removal,
4: Fine solids removal,
5: There are no moving parts inside.
The IGF system has no internal moving parts, reducing maintenance downtime dramatically. The Pump and Eductorare positioned on the outside of the building for convenient access.
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