Abstract
Abstract There are two categories of gas-liquid mixers: conventional and special-purpose. In theory, any conventional mixer can be applied to aerate a liquid, but fast-rotating devices are generally preferred. Special-purpose mixers (tubular, prismatic, cylindrical) have a hollow shaft, and operate by drawing gas from above the surface of the liquid and dispersing it inside the liquid. This process is referred to as aspirated aeration. In contrast, conventional mixers increase the pressure of the aspirated gas. Gas drawn from above the surface of the liquid flows through channels bored inside the shaft and the impeller, and is introduced to the liquid in this way. This article presents the results of an experiment investigating the aeration efficiency of a six-tube self-aspirating mixer at different rotational speeds. The experiment was conducted in a flow tank. The results indicate that self-aspirating mixers are effective devices for water aeration and mixing.
Highlights
The oxygen content of water is a very important consideration in analyses of environmental processes, and this problem has been addressed by numerous researchers
Stigebrandt and Kalen [3] evaluated the effect of hypolimnetic oxygenation in five Danish lakes, and demonstrated that deep water aeration should be used only as a temporary strategy to promote the survival of aquatic organisms in anaerobic periods
Aeration intensity was calculated using the ratio of the observed oxygen concentration to the potential oxygen concentration that can be achieved at a given temperature
Summary
The oxygen content of water is a very important consideration in analyses of environmental processes, and this problem has been addressed by numerous researchers. According to Gamo [1], the concentration of oxygen at the bottom of the Sea of Japan has decreased by approximately 8–10% over the last 30 years, which can be attributed to global climate change and higher sea surface temperatures in winter. Seasonal changes in oxygen concentration in the North Sea have been extensively researched [2]. Stigebrandt and Kalen [3] evaluated the effect of hypolimnetic oxygenation in five Danish lakes, and demonstrated that deep water aeration should be used only as a temporary strategy to promote the survival of aquatic organisms in anaerobic periods. In a study by Stigebrandt et al [5], the deep water of the anoxic By Fjord in Sweden was aerated with oxygen aspirated from the surface.
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