| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a treatment method and treatment apparatus of nitrogen containing water, capable of granulating a microorganism group containing nitrifying bacteria and denitrifying bacteria in a complete mixing type tank and in a system for continuously making water to be treated flow in. <P>SOLUTION: The biological treatment method of the nitrogen containing water includes: a nitrifying process of supplying the water to be treated to a nitrifying part and oxidizing ammonium ions in the water to be treated to nitric acid or nitrous acid; and a denitrifying process of supplying the water to be treated to the denitrifying part of a complete mixing type, supplying a hydrogen donor and reducing the nitric acid or the nitrous acid in the water to be treated to a nitrogen gas. In the denitrifying process, the addition amount of the hydrogen donor is changed with time so as to change the concentration of the hydrogen donor inside the denitrifying part with time. <P>COPYRIGHT: (C)2011,JPO&INPIT</p> |
