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Effect of nanobubbles for improvement of water quality in freshwater: Flotation model simulation

机译：纳米博布尔改善淡水中水质的影响：浮选模型模拟

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Recently, nanobubbles (NBs) in flotation have been discussed as a highly promising technique for separation or remediation of water contaminants in the environmental field. This study performed model simulations using a flotation model (FM) with NBs and very highly hydrophobic small particles, such as sediments of freshwater containing inorganic particles (clay and silt) and plastic debris. This study examined and confirmed that the effect of NBs for remediation of particles depends on the size and number of bubbles, size and density of aggregates, time of aggregate formation, and so on. This study also confirmed the NBs' features, such as the adjustment of their surface charge in electrolyte solutions as well as their affinity for hydrophobic surfaces leading to their stability. The features affect the attachment efficiency, which is estimated by calculating the surface interaction forces of hydrodynamics and surface chemistry. The aggregates formed by the attached NBs obtained very high formation efficiency (X) due to their very high attachment efficiency but very low separation efficiency (Y) due to their very slow rising velocity. In conclusion, the NBs may deteriorate the water quality instead of improving it because the aggregates formed by the NBs stay in the suspension for a long stagnation time. Therefore, further research is required to discover a more reasonable method for applying NBs with MBs in the field of freshwater treatment that causes a minimal adverse effect on the ecosystem and helps in optimal removal efficiency of the hydrophobic fine particles.
机译：最近，已经讨论了浮选中的纳米泡（NBS）作为对环境领域中水污染物的分离或修复的高度有希望的技术。该研究使用NBS和非常高疏水的小颗粒的浮选模型（FM）进行了模拟模拟，例如含有无机颗粒（粘土和淤泥）和塑料碎片的淡水沉积物。该研究检查并确认NBS对颗粒的修复的影响取决于聚集体，骨料形成时间的气泡，尺寸和密度的尺寸和数量等。该研究还证实了NBS的特征，例如在电解质溶液中调节其表面电荷以及它们对疏水表面的亲和力导致其稳定性。通过计算流体动力学和表面化学的表面相互作用估计，该特征影响了附件效率。由于它们非常高的附着效率而是由于它们的速度非常慢而获得，由所连接的NB形成的聚集体获得了非常高的形成效率（x），但由于它们的速度非常慢，因此具有非常低的分离效率（Y）。总之，NBS可以恶化水质而不是改善它，因为NBS形成的聚集体保持在悬浮液中长的停滞时间。因此，需要进一步研究以发现更合理的方法，用于在淡水处理领域应用NBS在淡水处理领域应用，这导致生态系统的最小不良影响，并有助于疏水性细颗粒的最佳去除效率。

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