Patent ID: 8641904
Filing Date: 2014-02-04
Classification: B01D

Abstract:
1. A method for backwashing a filtration membrane comprising the steps of: housing a filtration element within a casing, said filtrate element being formed of a ceramic filtration membrane comprising a substrate layer defining a secondary side of the ceramic filtration membrane and a separation layer formed on said substrate layer and defining a primary side of the ceramic filtration membrane; supplying raw water to the primary side of the ceramic filtration membrane and filtering the raw water to form filtrate water, which is removed from the casing via a filtrate water feed pipe and a filtrate water header pipe, wherein the filtrate water header pipe is arranged on a lower side of the filtrate water feed pipe; and supplying backwashing air to the ceramic filtration membrane via the filtrate water feed pipe when the ceramic filtration membrane is clogged with an obstructing material formed from filtering the raw water, wherein the backwashing air is supplied in the following stages: