| 摘要 |
<p>PURPOSE:To attain the excellent removal of nitrogen by making an inflection point appeared at the increasing time of DC value curve during an aerating operation as the index of the completion of a nitrification reaction and also making the inflection point appeared on lowering time of ORP value curve at the time of stopping the aerating operation as the index of the completion of a denitrification reaction. CONSTITUTION:At a measuring point 6 in the front step of the aeration tank 2, since after 32min. from the beginning of measurement, an inclination at the time of lowering ORP value curve is suddenly varied 8A, monitoring is continued to after 34min. Thus it is an inflection point is confirmed and aeration is started 9A, the concentration of nitrogeneous nitrogen is decreased to 0.1mg/L after 30min. at 8B hourly near the inflection point 8A and the denitrification reaction is completed is cleared. At the measuring point 7 in the rear step of the aeration tank 3, after 37min. 9C immediately after the start of aeration 10C DO value shows about 0.2mg/L and after 46min. after 11C the inclination of the increasing time of curve is suddenly increased and after 51min. it is the inflection point 12C is confirmed and the aeration is stopped.</p> |
