The use of fine bubbles is a promising approach to remove surfactant efficiently during the rinsing process of clothing, to fulfill a requirement. Therefore, the influence of fine bubbles on the removal performance of surfactant from cloth during the rinse process of pulsator washing machine (top loading type) was investigated. The test apparatus was assembled by connecting a microbubble generation tank and a small washing machine with tubes and circulating fine bubble water to a small washing machine. Swatches of cloth with a specified amount of linear alkylbenzene sulfonate (LAS) adsorbed from aqueous solution, were rinsed with tap water, and the LAS concentration in the rinse water was examined with an HPLC system equipped with a high‐precision fluorescence detector. The average bubble diameter of the fine bubble water used was 0.13–1.4 μm. In the rinsing experiment, no difference was found in the final LAS removal efficiency between water with and without bubbles; but the former increased the LAS removal rate during the initial stage of rinsing. This tendency was particularly noticeable when the stirring power of the washing machine was weak. Therefore, it was concluded that the fine bubble effect on the removal of the surfactant is mainly a kinetic effect rather than an equilibrium effect.

中文翻译：

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洗涤过程中细小气泡对线性烷基苯磺酸盐表面活性剂去除的影响

细气泡的使用是一种在衣物漂洗过程中有效去除表面活性剂以满足要求的有前途的方法。因此，研究了在波轮洗衣机漂洗过程中（顶部装载型）细小气泡对表面活性剂从布上去除表面活性剂的影响。通过将微气泡发生槽和带有管的小型洗衣机连接，并将细气泡水循环到小型洗衣机来组装测试装置。用自来水冲洗从水溶液中吸附了指定量的线性烷基苯磺酸盐（LAS）的布样，并用配备高精度荧光检测器的HPLC系统检查漂洗水中的LAS浓度。所用细气泡水的平均气泡直径为0.13–1.4μm。在冲洗实验中，在有气泡和无气泡的水中，最终LAS去除效率没有差异。但是前者在冲洗初期提高了LAS去除率。当洗衣机的搅拌力弱时，这种趋势特别明显。因此，可以得出结论，除去表面活性剂的细微气泡效应主要是动力学效应，而不是平衡效应。