Flotation units, which operate with the assistance of gas in the flotation process, have been widely used for the treatment of produced water both onshore and offshore. Differing technologies are applied to Flotation units for a specific application. The advantages and disadvantages of each arrangement plus the requirements of the process determine the choice of gas floatation mechanism. These methods can be divided in two major categories: Induced Gas Floatation (IGF), Dissolved Gas Floatation (DGF). A close comparison of IGF and DGF is studied in this paper to identify the main criteria affecting the performance and functionality of floatation units and their accessories in different environments. Additionally, this paper will describe the effects and benefits of using both IGF and DGF at the same time. The authors will verify their hypothesis through three years of laboratory and field study.

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