Plate type membrane module

Abstract

The invention discloses a plate type membrane module which comprises two oppositely arranged diaphragms and an inner support body arranged between the two diaphragms, wherein the inner support body comprises a first frame body and a first mesh body bridged at opposite inner sides of each side edge of the first frame body; the two diaphragms are connected with the first frame body in a sealing manner and are respectively located on both sides of the first mesh body; the plate type membrane module further comprises two outer support bodies respectively located on both sides of the inner support body; the outer support bodies comprise second frame bodies and second mesh bodies bridged at opposite inner sides of each side edge of the second frame bodies; the second frame bodies are connected with the first frame body in a fastening manner and enable the diaphragms to be located between the first mesh body and each of the second mesh bodies; a liquid outlet communicated with a cavity between the two diaphragms is formed in at least one side of the first frame body; clear liquid formed after a stock solution sequentially penetrates through the second mesh bodies and the diaphragms is converged in the cavity and is discharged from the liquid outlet.

Description

Technical field [0001] The present invention relates to the technical field of filtration, in particular to a plate membrane module. Background technique [0002] Plate membrane modules, hollow fiber membrane modules, and tubular membrane modules are commonly used filter elements. In China, hollow fiber membrane modules and plate membrane modules are commonly used. Hollow fiber membrane modules are prone to broken filaments under high filtration pressure, resulting in complex operation processes and higher costs, and the frequency of backwashing and chemical washing is much higher than that of plate membrane modules. Therefore, the hollow fiber membrane module The service life is generally not high, generally 2-3 years, while the plate membrane module can be maintained for 5-7 years. In addition, the sludge concentration range that the hollow fiber membrane module can handle is 4000-8000mg / L, and the sludge concentration range that the plate membrane module can handle can reach...

AI Technical Summary

Problems solved by technology

There are the following disadvantages: 1) The filtration pressure of the plate membrane module composed of plastic, filter paper and other materials is low, and backwashing cannot be performed; at the same time, due to the limitation of materials, the plate membrane module cannot be used in high temperature and strong acid and alkali corrosion environment ;2) Ceramic plate membrane modules have good chemical stability, acid and alkali resistance, and high mechanical strength, but the characteristics of ceramic materials provide a hotbed for scaling, low backwashing effect, and serious scaling, which has become the main factor affecting its life. Factors; 3) The characteristics of the ceramic material itself lead to the serious room temperature brittleness of the ceramic plate membrane module, which makes the plate membrane module have the characteristics of poor thermal shock resistance, non-machining, and non-welding connection.

Due to the weak adhesive force, the diaphragm and the porous structure often peel off each other, resulting in the loss of the filtration function of the plate membrane module, which seriously reduces product quality and increases production costs.

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