| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a process and equipment for treating an ammonia-containing liquid, in each of which the ammonia-containing liquid can be denitrified stably at a high speed by an anaerobic ammonia oxidation method without being affected by the change in concentrations of nitrogen components in the ammonia-containing liquid to be treated. <P>SOLUTION: A carrier, in which heterotrophic denitrifying bacteria for reducing nitric acid to nitrous acid and anaerobic ammonia oxidizing bacteria for simultaneously denitrifying ammonia and nitrous acid are entrapped and immobilized, is packed in a reaction tank. Waste water having a C/NO<SB>3</SB>-N ratio is supplied continuously to the reaction tank and treated. As shown by a graph in a figure, when waste water having 0.5-2.5, particularly, 1-2 C/NO<SB>3</SB>-N ratio is treated, T-N is removed at a high T-N removal rate of≥50%. However, when waste water having≥2.5 C/NO<SB>3</SB>-N ratio is treated, the T-N removal rate is lowered quickly. The reason why the T-N removal rate is lowered is considered that since the nitrification by heterotrophic denitrifying bacteria is performed preferentially, an anaerobic ammonia oxidation reaction by anaerobic ammonia oxidizing bacteria is obstructed. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
