| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To approach the concentration of sludge in concentrated sludge discharged from a membrane separation apparatus to a desired value by stably keeping the load on the membrane separation apparatus. <P>SOLUTION: In a method for operating the membrane separation apparatus for separating the sludge supplied from a sludge supply vessel 10 into filtrate and the concentrated sludge by introducing the sludge into the membrane separation apparatus 20, one of operations consisting of a discharge operation to discharge the whole quantity of the concentrated sludge from the apparatus, a circulation operation to return the whole quantity of the concentrated sludge to the sludge supply vessel 10 and a pushing-out operation to discharge the concentrated sludge from the apparatus to the quantity corresponding to that of the supplied sludge supplied while stopping the membrane separation is automatically switched to other operation by a controller 46 correspondingly to the concentration of the sludge in the concentrated sludge which is detected by a sludge densitometer 44. <P>COPYRIGHT: (C)2004,JPO</p> |
