| 摘要 |
<p>A method of treating wastewater which comprises the flow-in step of flowing organic wastewater into an active sludge tank having an active sludge containing microorganisms pooled therein and the separation step of biologically treating the organic wastewater in the active sludge tank and then subjecting the thus treated liquor to solid/liquid separation with the use of a separation membrane device located in the active sludge tank, characterized in that the sugar concentration in the aqueous phase of the active sludge is maintained within a definite range during the separation step. According to this method, the risk of reducing the effective membrane area due to sticking of biopolymers to the membrane surface can be appropriately evaluated and thus the wastewater can be efficiently treated while preventing an increase in membrane filtration resistance.</p> |
