Improved hollow fiber nanofiltration membrane assembly

Abstract

The invention provides an improved hollow fiber nanofiltration membrane assembly, which comprises a membrane shell and a flow guide type filter membrane element arranged in the membrane shell, whereinthe flow guide type filter membrane element comprises membrane filament units arranged in a liquid channel and used for filtering, flow guide plates for improving fluid distribution, separation chambers and fixing layers arranged at the two ends of the membrane shell, poured with a resin and used for fixing the membrane filament units and the flow guide plates. According to the invention, by improving water flow distribution in the assembly, separation chambers enable water flow to be forcibly separated in the membrane element at the water inlet sside and the water outlet side of the membraneaseembly to reduce the obstruction of the membrane element to the water flow, reduce the membrane element outlet pressure drop, avoid the damage to the membrane element due to water flow impact, andeffectively improve the water flow impact resistance of the nanofiltration membrane assembly on the premise of ensuring that the hardware of the flow guide type hollow fiber nanofiltration membrane system is not changed, so that the operation efficiency of the hollow fiber nanofiltration membrane is improved, wherein the rejection rate is improved, the water production flux is improved, the pressure loss of the membrane assembly is reduced, and the service life of the membrane assembly is prolonged.

Description

technical field [0001] The invention relates to the technical field of membrane modules, in particular to an improved hollow fiber nanofiltration membrane module. Background technique [0002] In the diversion type hollow fiber nanofiltration membrane module, the water flow directly impacts the membrane element through the inlet of the membrane module, and the tightly packed membrane elements are prone to local short circuit and filtration dead angle due to uneven distribution of water flow, while the concentrated liquid concentrates from the membrane module Outflow from the outlet end, where the tightly packed membrane elements seriously hinder the passage of liquid, resulting in an increase in the pressure drop at the inlet and outlet of the membrane module; in addition, during the operation of the system, the water flow changes greatly or the surface velocity of the membrane element is forced to increase to increase the flux of product water At the same time, the membrane...

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Problems solved by technology

[0002] In the diversion type hollow fiber nanofiltration membrane module, the water flow directly impacts the membrane element through the inlet of the membrane module, and the tightly packed membrane elements are prone to local short circuit and filtration dead angle due to uneven distribution of water flow, while the concentrated liquid concentrates from the membrane module Outflow from the outlet end, where the tightly packed membrane elements seriously hinder the passage of liquid, resulting in an increase in the pressure drop at the inlet and outlet of the membrane module; in addition, during the operation of the system, the water flow changes greatly or the surface velocity of the membrane element is forced to increase to increase the flux of product water At the same time, the membrane elements are vulnerable to the strong impact and disturbance of the water flow, resulting in local damage or fracture, which affects the operation stability of the membrane system; it can be seen that there are still many deficiencies and deficiencies in the existing membrane elements, which are not really good designs. in need of improvement

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