| 摘要 |
<p>PROBLEM TO BE SOLVED: To establish a new technique which uses both advantages of biological and chemical methods to remove nitrogen and to provide a method to remove nitrogen in a high level from an org. sewage to stably obtain a high nitrogen removing rate. SOLUTION: This method is a circulating biological nitrification and denitrification method to circulate an org. sewage containing ammonia nitrogen in a biological treating tank equipped with a denitrification part 4 and a nitrating part 2. A gel carrier including zeolite is made to be present in the activated sludge in the biological treating tank. The feed water 1 is supplied to the biological denitrification part 4, from which the carrier and microorganism slurry from the denitrification part 4 are circulated 5 to the nitrating part 2, while microorganism slurry 6 flowing out from the denitrification part 4 is introduced to a sedimentation tank 7. In this method, ammonia is adsorbed by the zeolite in the denitrification part and the ammonia is oxidized in the nitrating part and desorbed from the zeolite. The zeolite is regenerated and circulated for reuse.</p> |
