| 摘要 |
<p>PURPOSE:To effectively perform the aeration treatment even if the quantity and quality of dirty water is changed, by controlling the quantity of air supply and returning quantity of activated sludge in accordance with the signal of detecting means of BOD so as to keep BOD in the regulation vessel at a constant value or less. CONSTITUTION:Operation of the blower 3 and the pump 17, is ordered by the aeration treatment control part 20 when treating capacity or more of BOD in the aeration vessel 6, is detected by the BOD detection part 19. Next, a part of dirty water stored in the vessel 1, is pumped up in the regulation water vessel 9 by the underwater pump 10 and is supplied to the vessel 6 through the water supply tube 11. At this time, the operation time of the pump 10 and opening degree of the valve 12, are ordered by the dirty water supply quantity control part 21 in the central control apparatus 18 so that BOD of water being supplied to the vessel 6 is in treatable degree in the vessel 6. Aeration treatment of the dirty water sent in the vessel 6, is performed by supplying the air and activated sludge by the control apparatus 22, 23 and the sludge is removed in the separation vessel 13. Thus, BOD of the sludge supplying to the vessel 6, is always kept at constant value or less and purifying treatment can be effectively performed.</p> |
