A Preliminary Experiment on Reservoir Water Purification by Using a Micro-Bubble Aeration System

Abstract

A water purification system was developed and installed in the lower layer of a eutrophic reservoir . A preliminary test was conducted in order to examine its performance. The aerator generates fine air bubbles of several ten micro millimeters, so-called micro-bubbles. Dissolved oxygen, temperature, electric conductivity and other water quality items have been measured in every two weeks after starting the micro-bubble aeration in March 1999. Despite continuously operating the system, total amount of dissolved oxygen in the reservoir has decreased so far, from which the air discharge is estimated to be less than oxygen consumption due to decomposition . Nevertheless, DO concentration in the lower layer is higher than that observed in the last four years , while DO in the surface layer has been kept less than that in the last four years. These results suggest that the system functions for aerating water body to some extent, except that the air discharge is not sufficient for complete aeration , yet.

Electrical potential of microbubble generated by shear flow in pipe with slits

“…Water quality can be improved using an air supply with microbubble dissolution. Suspended solids are effective in the purification of polluted water in rivers, lakes, seas, and aquariums (Michioku et al, 2000;Takada, 2005), because microbubbles dissolve in water and the gas components of the bubble can be effectively supplied. Considerable research efforts at a number of institutions have been devoted to advancing the technology of microbubbles due to a variety of potential applications using microbubbles, which have been mentioned above (Ohnari, 1998;Fujiwara et al, 2003).…”

Flow Characteristics in a Honeycomb Structure to Design Nanobubble Generating Apparatus

“…In recent years, nanobubble technology has drawn great attention due to its broad applicability in wide fields of science and technology, such as life science, machinery industry, medical engineering, chemical industry, agriculture, fisheries, and civil engineering , especially focusing on washing several items, sterilization, and promoting germination. A lot of previous studies discussed microbubble generation whose diameters d are 1–100 µm , .…”