Membrane filter with double filtration

Abstract

The invention discloses a membrane filter with double filtration, which belongs to the fields of environment-friendly water treatment technologies and membrane separation technologies. The membrane filter is particularly suitable for an immersed membrane bioreactor (MBR). The membrane filter with double filtration is characterized by consisting of a plurality of membrane filtering units, wherein a plurality of capillary membranes are wrapped and protected by virtue of a mesh filter sleeve. As each capillary membrane is provided with a protecting jacket, the problem that the root part of each capillary membrane is fragile is solved; due to being filtered by the mesh filter sleeve, fiber matters have no chance to contact and wind the capillary membranes; as the fiber matters outside membrane bundles are relatively easy to be removed though a mechanical method, the trouble of damaging the capillary membranes by the fiber matters does not need to be worried about; and as produced water is filtered through a filter cloth filter sleeve and the capillary membranes, the quality of the produced water is better ensured.

Description

technical field [0001] The invention belongs to the field of environmental protection water treatment technology and membrane separation technology, and particularly relates to a membrane filter for double filtration, including nanofiltration, ultrafiltration and microfiltration membrane filters. This kind of membrane filter is especially suitable for submerged membrane bioreactor (MBR), membrane enhanced bioreactor (MEBR) and membrane filtration. Background technique [0002] Hollow fiber membranes or capillary membranes in the known art generally constitute pressure or submerged membrane filters. For clarity, this patent application refers to the division of hollow fiber membranes, capillary membranes and tubular membranes in the US patent (7517421B2), and defines the outer diameters of hollow fiber membranes, capillary membranes and tubular membranes as 0.03-0.1mm; 0.2- 3mm and 4-50mm. The present invention relates to capillary membranes of 0.2-3.0 mm. In addition, nan...

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Problems solved by technology

[0006] The present invention aims to solve the technical problems that the roots of the submerged membrane filter are relatively fragile and the fibers in the sewage are piled up and entangled around the capillary membrane in the prior art, and reveals a membrane filter with double filtration

[0008] The beneficial effect of the membrane filter of the double filtration of the present invention is that each bundle of capillary membranes is provided with a protective cover, which solves the problem that the roots of the capillary membranes are fragile; because the mesh cloth filter cover filters the fibrous substances, these substances no longer have the opportunity to be separated from the membrane. The capillary membrane contacts and entangles; the fibrous material outside the membrane bundle is easier to remove by mechanical means without worrying about damage to the capillary membrane; the produced water is filtered through the filter cloth filter sleeve and the capillary membrane, and the quality of the produced water is more guaranteed

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