| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To facilitate treatment and disposal of initially settled sludge and to effectively utilize the resultant soluble organic materials for release of phosphorus and denitrification reaction. <P>SOLUTION: In the method of treating waste water, a water to be treated which contains organic materials, solids and ammonia nitrogen is subjected to settling treatment in an initial settling basin 12, then the water is subjected to a biological treatment by passing the water through an anaerobic vessel 60, an oxygen-free vessel 70, and an aerator (aerobic vessel) 20 in this order, a part of the nitrified water obtained in the aerator 20 is circulated to the oxygen-free vessel 70, the nitrified water of the remaining part is subjected to the settling treatment in a final settling basin 24 and returning the finally settled water undergoing the separation to the anaerobic vessel 60. The initially settled sludge 16 separated in the basin 12 is circulated to the basin 12. <P>COPYRIGHT: (C)2004,JPO</p> |
