Working principle of Dissolved Gas Flotation
Jan 18,2024
Dissolved Gas Flotation (DGF) is a process used for the separation of oil and solids from water. Its working principle revolves around the use of fine gas bubbles to attach to the oil droplets, causing them to rise to the surface for removal.
In DGF, the contaminated water is introduced into a flotation tank or vessel, which is typically equipped with a system to inject gas, such as air or nitrogen. The gas is dissolved under pressure to form small bubbles, usually in the range of 20 to 100 microns in diameter.
As the water enters the tank, the pressure is released, causing the dissolved gas to come out of solution in the form of tiny bubbles. These bubbles rise through the water and attach themselves to the oil droplets, which are typically larger and lighter than water.
The buoyancy provided by the gas bubbles allows the oil droplets to rise to the surface of the tank, forming a layer of oil that can be skimmed off or collected for further treatment. The remaining water, now separated from the oil and solids, is discharged from the bottom of the tank.
The efficiency of DGF depends on various factors, including the size and distribution of gas bubbles, the concentration and characteristics of the oil and solids, and the design of the flotation tank. Optimal conditions are typically achieved through careful control of parameters such as gas flow rate, residence time, and the addition of chemicals to aid in the separation process.
DGF is an effective method for removing oil and solids from water, commonly used in industries such as oil and gas, wastewater treatment, and mining. It offers a reliable and efficient way to achieve separation, contributing to the overall goal of environmental protection and resource conservation.
In DGF, the contaminated water is introduced into a flotation tank or vessel, which is typically equipped with a system to inject gas, such as air or nitrogen. The gas is dissolved under pressure to form small bubbles, usually in the range of 20 to 100 microns in diameter.
As the water enters the tank, the pressure is released, causing the dissolved gas to come out of solution in the form of tiny bubbles. These bubbles rise through the water and attach themselves to the oil droplets, which are typically larger and lighter than water.
The buoyancy provided by the gas bubbles allows the oil droplets to rise to the surface of the tank, forming a layer of oil that can be skimmed off or collected for further treatment. The remaining water, now separated from the oil and solids, is discharged from the bottom of the tank.
The efficiency of DGF depends on various factors, including the size and distribution of gas bubbles, the concentration and characteristics of the oil and solids, and the design of the flotation tank. Optimal conditions are typically achieved through careful control of parameters such as gas flow rate, residence time, and the addition of chemicals to aid in the separation process.
DGF is an effective method for removing oil and solids from water, commonly used in industries such as oil and gas, wastewater treatment, and mining. It offers a reliable and efficient way to achieve separation, contributing to the overall goal of environmental protection and resource conservation.
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