| 摘要 |
<p>PROBLEM TO BE SOLVED: To reduce an amount of feed air while oxygen dissolution efficiency of a solubilization tank is improved, by a method wherein high pressure air is made to pass into the solubilization tank, and further fed to an aeration tank. SOLUTION: A compressor 8 is annexed to a solubilization tank 6 formed in a hermetically sealed state, and high pressure air is introduced into the solubilization tank 6. An inside of the solubilization tank 6 is solubilized thereby. The solubilization tank 6 is connected to an aeration tank 2 with a pipe line 9, and treated effluent solubilized with the solubilization tank 6 together with high pressure air is introduced into the aeration tank 2, and aerated. By this structure, a solubilization percentage near to about 50% can be obtained by a draft amount of about 1 Nl/min. Further, since an upper part of the solubilization tank is hermetically sealed, dispersion of irritating odor owing to exhaust gas like a conventional open one is eliminated, and exhaust gas odor can be controlled.</p> |
