| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To develop efficient means for performing denitrification treatment of nitrate - nitrogen of raw water by suppressing the amount of dissolved oxygen. <P>SOLUTION: The oxygen in a hermetic reaction chamber 12 (first water tank) is decreased by an aeration system to circulate air in the reaction chamber and the anaerobic reaction utilizing microorganisms (facultative anaerobes/ denitrifiers) is progressed for the raw water 20. In addition, a foggy (gaseous phase) hydrogen donor 48, such as methanol, is charged into the hermetic reaction chamber to progress the anaerobic reaction and further formed gaseous nitrogen 50 is stuck to the activated sludge and while the sludge is dispersed and suspended, the gas is sent up in the form of gaseous bubbles from the water tank to give rise to the anaerobic reaction considerably enhancing the advection effect of the raw water and the activated sludge. The denitrification apparatus 10 adopts a circulating system to return the activated sludge- containing water 26 shifting into the second water tank 34 to the first water tank 32 by returning means 44. <P>COPYRIGHT: (C)2003,JPO</p> |
