FUNDAMENTAL STUDY ON THE INCREMENT OF DISSOLVEDOXYGEN IN THE WATER BY MEANS OF THIN FILMS OF BUBBLES

Abstract

In order to improve DO condition of lake or sea, this paper proposes a method of increment of DO in the water and gives an experimental investigation for the method. A vertical pipe connected to the waters where DO is poor is set in the water, inside of which are located an air -stone and a honeycomb above it. Bubbles formed accumulate on the top of the honeycomb, and all water to be treated becomes the elements of thin film of bubbles. Thus high performance gas dissolution is achieved. Quantities such as DO, rate of treatment etc. were examined for various conditions. It has been shown that there is an optimal size of honeycomb from gas resolution rate and that the optimal condition is realized when the relative velocity of the gas and liquid is almost the same as the slug velocity.