| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a high degree removing method of nitrogen in an organic sewage capable of stably attaining high nitrogen removing ratio by establishing a new technique jointly using both advantages of a biological and a chemical nitrogen removing method. SOLUTION: This method is for treating an ammonia nitrogen-containing organic sewage by a circulation type biological nitrification-denitrificating method by circulating in a biological treating vessel having a dinitrification part 4 and a nitrification part 2. Zeolite particles 12 are coexisted in an activated sludge in the biological treating vessel, a raw water 1 is supplied to the biological denitrification part 4, a part of the slurry flowing out from the denitrification part 4 is circulated 5 to the nitrification part 2, the remain 6 is introduced to a sedimentation tank 7 and sedimented and separated. The separated sludge 10 is returned to the nitrification part 2 and ammonia is adsorbed by the zeolite in the denitrification part 4 and oxidized in the nitrification part 2 to be desorbed from the zeolite and the zeolite is regenerated and recycled.</p> |
