Aerating device for a water filtering system with immersed membranes, including a floor provided with means for injecting a gas and at least one pressure balancing system

Abstract

The invention concerns an aerating device for a water filtering system with immersed membranes (9) designed to be installed substantially beneath said membranes (9). The invention is characterized in that it comprises a floor (1) separating an upper chamber wherein said membranes are immersed and a lower chamber comprising means for feeding a liquid to be treated and means for feeding an aerating gas, said floor being provided with plural strainers (2) and with at least one system (5) for balancing pressures between said upper and lower chambers, and in that each strainer (2) includes a substantially tubular element (13) passing through said floor and having in its upper part at least one orifice (4), and an air chamber forming element (3) mounted atop said upper part.

Description

technical field [0001] The invention relates to the field of water treatment. More specifically, the invention relates to a device for injecting gas for purging a filter membrane immersed in a medium to be filtered. Background technique [0002] According to the existing filtration technology, the filtration system comprises vertically submerged membranes assembled in groups into substantially cylindrical, parallelepipedic or rectangular modules. Typically, these modules comprise planar membranes or hollow fiber membranes made of organic material which are filled at least one end of the modules. [0003] The liquid being treated is filtered by suction from the outside of the membrane towards the inside of the membrane. [0004] These membranes are typically microfiltration or ultrafiltration membranes. [0005] The invention is particularly suitable for devices in which the membranes are arranged in a vertical position, but it is also suitable for filtration devices in wh...

AI Technical Summary

Problems solved by technology

[0009] In existing submerged membrane filtration systems, there is a problem that the membranes gradually become clogged with the material being filtered, known as sludge - especially for submerged membranes in bioreactors containing activated sludge in terms of

[0022] A disadvantage of this mode of gas injection in these prior art is that in the sludge / air mixing area, due to the deposition of sludge (or large particles, fibers, etc., which are transported by the liquid to be treated) , the injection orifice at the bottom of the membrane bundle is gradually blocked

However, doing so proved to be a costly solution

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