Nonfoaming adsorptive bubble separation

The following are the classifications of nonfoaming adsorptive bubble separation  

any type of technique can be used for generating gas bubbles in a nonfoaming adsorptive bubble separation system. The most effective bubble generation techniques for a nonfoaming system are dissolved air flotation and electrolytic flotation. The following are the process descriptions of selected nonfoaming processes. 

Bubble fractionation is similar to foam fractionation except that there is no foam produced in the system thus, it is applied to dilute surface-active solutions that do not foam while foam fractionation is applied to surface-active solutes at high concentration (76,77). Technically speaking, bubble fractionation represents an operation in which gas is bubbled up through a vertical bubble reactor containing the surface-active solute(s) 

Continuous bubble fractionation can be a potential pretreatment process for the reduction of dilute, refractory surfactants present in the water or wastewater. Besides, effective solution separation should result in some valuable by-product recovery. 

Solvent sublation involves the collection of the enriched material on the bubble surface in an immiscible liquid above the bulk liquid media. More specifically, it is a technique in which the material raised to the surface of a solution by flotation is collected and prevented from redispersing into the bulk phase. This is achieved by spreading a thin layer of an immiscible organic solvent on the surface of the solution which causes the floated material to dissolve or to become suspended. 

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According to the collection procedure for the enriched gas-liquid and/or gas-solid interfaces, adsorptive bubble separation processes or techniques can also be divided into two large categories (a) foam separation, which involves the production of foam in the process, and (b) nonfoaming adsorptive bubble separation, which involves no production of foam. Foam separation can be further subdivide into foam fractionation and flotation. Nonfoaming adsorptive bubble separation, however, can be further subdivided into bubble fractionation, solvent sublation, and noirfoaming flotation. Lemlich (84) and Wang (1,75) provided the definitions of these technical terms in their books. 

One of the most important adsorptive bubble separation processes is nonfoaming flotation. The process is termed flotation because the species being separated from the bulk media are mainly or partially insoluble particulates, such as sludges or agglomerates. It is a nonfoaming process system in which no production of foam is involved. 3.2.3.I. Nonfoaming Precipitate Flotation... 

In the batch adsorptive bubble separation processes, a feed solution was introduced to a bubble separation column (or chamber) containing an aqueous solution of surface-active materials. Surface-active solutes or complexes that are hydrophobic and readily attachable to the air bubbles are carried up to the surface of the water by the bubbles. The enriched material at the top (whether collapsed foam from a foam separation column or overflow liquid from a nonfoaming bubble separation column) and the clarified drain solution at the bottom are withdrawn from the system. The overall material balance for the process is as follows ... 

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