| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide a method of treating an organic drainage, in which the fact that the quality of water in a biological treatment tank provided with a separation membrane, is changed so as to result in deterioration of the membrane filtration performance, is exactly grasped without introducing any special measurement instrument, so that clogging of the membrane surface is prevented. <P>SOLUTION: In the method of treating an organic drainage where water in a biological treatment tank is subjected to membrane filtration with a separation membrane 6 outside the tank, the dissolved organic carbon concentration (DOC) or soluble chemical oxygen demand (S-COD) of water in the tank is measured, and when the measured value increases and exceeds a predetermined value, a coagulant is added. The DOC can be measured with a TOC meter after removing SS in the water in the tank with a filter paper. The S-COD can be measured with a COD meter after removing SS in the water tank with a filter paper. With an increase in the measured dissolved organic carbon concentration or soluble chemical oxygen demand, the coagulant may be added in an increased amount. <P>COPYRIGHT: (C)2010,JPO&INPIT</p> |
