METHOD OF TREATING ORGANIC DRAINAGE

摘要

A method of treating an organic drainage whereby a change in the qualities of water in a tank, which is a biological treatment tank provided with a separation membrane outside the tank, toward the deterioration of the membrane filtration performance can be exactly grasped without resorting to any special measurement instrument and thus the clogging of the membrane surface can be prevented. The dissolved organic carbon concentration (DOC) or soluble chemical oxygen demand (S-COD) of water in the tank is measured.When the measured value increases and exceeds a definite level, 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 in the 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.