Patent ID: 9370748
Filing Date: 2016-06-21
CPC Classification: B01D

Claim Text:
1. A method for detecting a membrane leakage in a membrane filter device, wherein a membrane filter device includes a stack of adjacent essentially identical recess plates, wherein the adjacent recess plates include recesses and the recesses form filter chambers between the adjacent recess plates of the stack, wherein a suspension is supplied into the filter chambers on a cake side of a filter cloth, wherein the suspension permeates the filter cloth to a filtrate side of the filter cloth, so that a solid content of the suspension deposits on the filter cloth as a filter cake, wherein each filter chamber includes a movable membrane, wherein the membrane and the recess plate enclose a squeezing chamber, wherein the recess plate includes an inlet duct for introducing a pressurizing medium into the squeezing chamber for pressing respective filter cake out mechanically, the method comprising the steps: for each of the filter chambers supplying the pressurizing medium into the respective squeezing chamber; after supplying the pressurizing medium closing the respective inlet duct tight, monitoring a pressure inside the squeezing chamber; and detecting a decrease in the pressure as evidence for a leakage of the membrane.