| 摘要 |
<p>PURPOSE:To continuously operate a membrane separator and to improve capacity in the waste water treating device with a diffuser set at the lower part of the separator by branching an air feed line into two lines and fixing a nitrogen enriching module to the one line. CONSTITUTION:A switching valve 11 is switched to an ordinary line without a nitrogen enriching module 12 in the nitration stage, and waste water is aerated through a diffuser 5. At this time the inside of a reaction tank 1 is made aerobic, and the nitration reaction is promoted by nitration bacteria. The valve 11 is then switched to the line having the module 12 in the denitrification stage, and aeration is conducted. At this time, the inside of the tank 1 is made anaerobic, and the denitrification reaction is promoted by denitrification bacteria. A suction pump 8 is driven both in the nitration stage and denitrification stage, a membrane separator 9 is intermittently operated in the continuous operation state, aerobic state and anaerobic state, the water to be treated in the tank 1 is subjected to solid-liq. separation, and the permeated liq. is discharged as treated water.</p> |
