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Effect of size variation on microbubble mass transfer coefficient in flotation and aeration processes

机译：浮选和曝气过程中尺寸变化对微气泡传质系数的影响

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摘要

Microbubble technology dramatically raises the efficiency of the flotation and aeration processes of water treatment plants (WTPs), which see extensive use in developed countries. A local institution, Indonesia Water Institute, has tried to investigate microbubble technology intended for lab-scale WTP. However, the current reactor system does not yet meet the microbubble criteria, especially as it has had few investigations of its abilities in flotation and aeration. This study aims to analyze the effect of size variations that affect the rising velocity and mass transfer coefficient (kLa) of aeration contact time. Three local spargers were used to produce microbubbles. Bubble diameters were measured optically and analyzed using ImageJ software. The dissolved oxygen (DO) concentration was measured every minute using an automated sensor so that the kLa could be determined. Of the three spargers, the smallest bubble size was produced by the vortex type with an average bubble diameter of 89 μm and the slowest rising velocity of 17.67 m/h. It also yielded the highest kLa of 0.297/min, which gave an aeration contact time of 3.64 minutes. The experimental uses of three local spargers revealed that the smaller the microbubble diameter, the higher the mass transfer coefficient in flotation and aeration processes. This research can be the basis for developing microbubble technology for WTP in Indonesia.
机译：微气泡技术极大地提高了水处理厂（WTP）的浮选和曝气过程的效率，在发达国家已广泛使用。印尼水研究所（Indonesia Water Institute）是一家本地机构，试图研究用于实验室规模WTP的微泡技术。但是，当前的反应器系统尚不满足微泡标准，特别是因为它对浮选和曝气能力的研究很少。本研究旨在分析尺寸变化对曝气接触时间的上升速度和传质系数（kLa）的影响。使用三个局部喷射器产生微泡。光学测量气泡直径，并使用ImageJ软件进行分析。使用自动传感器每分钟测量一次溶解氧（DO）浓度，从而可以确定kLa。在这三个喷射器中，最小的气泡尺寸是由涡流类型产生的，平均气泡直径为89μm，最慢的上升速度为17.67 m / h。它还产生了最高的kLa，为0.297 / min，充气接触时间为3.64分钟。三个局部喷射器的实验使用表明，微气泡直径越小，在浮选和曝气过程中传质系数越高。这项研究可以为在印度尼西亚开发用于WTP的微泡技术提供基础。

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