Adsorbent bubble separation

This is a method of separation in which solutes or dispersed particles in a solution are adsorbed or attached to the surface of the bubbles that are generated. Foam separation has long been used for flotation, but in recent years it has also been applied to the separation of ions, molecules, colloids, etc., and BL Karger et al. of Germany proposed a unification of the term (1967). In other words, foam separation is a process in which a surface-active substance in a solution is adsorbed or attached to the bubble surface in the bubble layer and the foam surface in the foam layer by using both the bubble layer in which bubbles are dispersed in a liquid and the foam layer formed on top of it, and separation from the solution is called foam separation, while nonfoaming adsorptive bubble separation is a process in which a solute or particle in the liquid is adsorbed or attached to the surface of the bubbles that rise in the bubble layer without forming a foam layer. Foam separation has been widely used in wastewater treatment in recent years.

[Toyohiko Hayakawa]

Source: Shogakukan Encyclopedia Nipponica About Encyclopedia Nipponica Information | Legend

溶液中に気体を吹き込み分散させ、発生した気泡の表面に溶液中の溶質または分散粒子を吸着または付着させて分離する方法をいう。起泡分離は古くから浮遊選鉱などとして用いられてきたが、近年イオン、分子、コロイドなどの分離にも応用されるようになり、ドイツのカルガーB. L. Kargerらが用語の統一を提案した（1967）。すなわち、液体中に気泡が分散している気泡層とその上部に形成される泡沫(ほうまつ)層の両方を利用して気泡層中の気泡表面および泡沫層中の泡沫表面に溶液中の界面活性物質を吸着または付着させて溶液から分離する操作を泡沫分離foam separationとよび、泡沫層を形成させず気泡層のみを用い気泡層中を上昇する気泡の表面に液中の溶質や粒子を吸着または付着させて液と分離する操作を気泡分離nonfoaming adsorptive bubble separationとよんでいる。起泡分離は近年廃水処理に用いられる例が多い。

［早川豊彦］

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