| 摘要 |
<p>PURPOSE: A process for supplying microorganism into an aeration tank to remove air bubble existing around microorganism in excess sludge is provided which can be used for the biological treatment. CONSTITUTION: In the process of biological treatment of sewage and waste water by supplying a part of excess sludge to an aeration tank, excess sludge recycling to the aeration tank is obtained by injecting, spraying and removing air bubble existing around microorganism in excess sludge. Excess sludge having a total solid of 3,000mg/L and a volatile of 2,000mg/L is poured in a storage tank. Injected sludge is scattered in atomizing and falls down to a settling tank(5), excess sludge begins to concentrate by flowing down a swash plate, effluent air and gas are exhausted through an outlet(61). The experiment on the consumption rate of dissolved oxygen indicating activity of microorganism shows that the total amount of dissolved oxygen consumption of treated excess sludge is 2.5 times as much as untreated excess sludge.</p> |
