AN ATTEMPT TO IMPROVE DO CONDITION UTILIZING BUBBLES CLUSTER FORMED BY THE PIPE AERATION TECHNIQUE

Abstract

  Oxygen deficiency in closed waters seems to induce serious problems. The authors have been trying to solve the problem utilizing liquid membranes of bubbles cluster formed by aeration in the h-shaped pipe located near the water surface, which enables to improve DO condition in the water at high efficiency and low energy cost. In this paper experimental results are given for DO improvement of the above system. The oxygen transfer rate N₍₂₀₎ and the efficiency E_P defined as the transfer rate per unit work rate required for aeration are examined for various values of the aeration depth H_A, flow rate of supplied air Q_g, and the height of the pipe H_U. As the results, both N₍₂₀₎ and E_P take high values when H_U is small and H_A is large. Also there is some optimum Q_g for a given diameter of the pipe.