| 摘要 |
<p>PROBLEM TO BE SOLVED: To perform high load treatment by efficiently propagating ANAMMOX bacteria and holding the propagated ANAMMOX bacteria to high concentration in the system, in performing the biological denitrification of raw water containing ammonia nitrogen and nitrous nitrogen by the ANAMMOX bacteria being autotrophic denitrifying bacteria using ammonia nitrogen as an electron doner and nitrous nitrogen as an electron acceptor. SOLUTION: The denitrified treated liquid of a denitrification tank 1 holding the ANAMMOX bacteria is subjected to membrane separation in a membrane separator 3 to obtain treated water. Both of or either one of the concentration of ammonia nitrogen and the concentration of nitrous nitrogen in the denitrified treated liquid separated in the membrane separator 3 is set to 0-3 mg/l.</p> |
