What is Dissolved Gas Flotation (DGF)?

Dissolved Gas Flotation (DGF) is a produced water treatment process that uses fine gas bubbles to separate dispersed oil, suspended solids, and other contaminants from water. The bubbles attach to contaminants and float them to the surface for removal.

What is the difference between DGF and DAF?

The main difference is the gas used. DAF (Dissolved Air Flotation) uses air, while DGF (Dissolved Gas Flotation) typically uses nitrogen, natural gas, or another suitable gas. DGF is preferred in hydrocarbon-rich environments because it avoids introducing oxygen into the process.

Why is DGF used for produced water treatment?

DGF is well suited for produced water because it efficiently removes dispersed oil and fine suspended solids. It is particularly useful as a secondary treatment step after primary oil-water separation.

Why is DGF safer than DAF in oil and gas applications?

Produced water can contain hydrocarbons and other flammable compounds. Using air introduces oxygen into the treatment system, which can increase fire and explosion risks. DGF uses gases such as nitrogen or process natural gas, making it more suitable for hydrocarbon-handling environments.

What gas is commonly used in DGF systems?

Nitrogen is commonly used because it is inert and does not support combustion. Depending on the application and system design, natural gas or other suitable gases may also be used.

Dissolved Gas Flotation (DGF): How It Works