MEMBRANE PURIFYING METHOD IN MEMBRANE SEPARATION APPARATUS

摘要

PURPOSE:To recover a filtering speed without stopping a filter apparatus and damaging the surface of a membrane, by mixing a liquid containing bacteriolysis bacteriophage in a liquid to be filtered to decompose and remove the adhesion substance and precipitate containing bacteria on the surface of the membrane. CONSTITUTION:Filtering is continued by a membrane separator 1 and, when a filtering speed is lowered by the adhesion and precipitation of bacteria to the surface of a membrane, a valve 9 is opened and bacteriolytic solution is sucked to be mixed with a liquid to be filtered. The bactriolytic solution is carried by the flow of the liquid to be filtered to reach the surface of the membrane and brought into contact with the bacteria adhered and precipitated to the surface of the membrane and the bacteria are decomposed by the bacteriolytic action of the bacteriophage in the bacteriolytic solution to remove the adhesion substance and precipitate on the surface of the membrane and the capacity of the membrane 2 is restored. The bacteria decomposed substance is discharged from a discharge line 12 along with concn. water through a three- way valve 13.