Raw water separator for spiral membrane module, membrane module containing separator and reverse osmosis membrane device

Abstract

The invention relates to a raw water separator for a spiral membrane module, a membrane containing the separator and a reverse osmosis membrane device. The raw water separator is a net structure formed by intersecting warp wire rods and weft wire rods. The warp wire rods are parallel to the raw water flow direction of the membrane module. The weft wire rods are arranged in the direction perpendicular to the warp wire rods. A channel which is consistent with the raw water flow direction is formed between the warp wire rods and the weft wire rods and the spiral membrane. The weft wire rods of the raw water separator are perpendicular to the direction of the channel so as to obstruct raw water flowing along the channel. Thus, turbulent is generated, and concentration polarization of raw water and pollutant clogging are avoided. Through the raw water separator, the membrane module can be applied in higher TDS and COD high-salt complex wastewater treatment. By the utilization of the reverse osmosis membrane device, part of pretreatment facilities can be minimized or canceled during the application process, and the same salt rejection and product water recovery rate are realized. Therefore, project investment is greatly minimized and operating cost is reduced.

Description

technical field [0001] The invention relates to a raw water spacer for a spiral membrane module, a membrane module and a reverse osmosis device using the membrane module, belonging to the technical field of reverse osmosis and filtration. Background technique [0002] In the prior art, in the production processes of seawater desalination, ultrapure water, desalinated water, and reclaimed water reuse, the reverse osmosis membrane (RO membrane) and nanofiltration membrane (NF membrane) components used are mainly in the form of spiral Membrane elements are the main ones. [0003] In the process of using this spiral membrane module to produce various kinds of water, usually because the thickness of the raw water separator of the spiral membrane element is less than 1mm, which is relatively thin, the raw water flow channel formed is relatively narrow, and the turbid organic colloid is easy to deposit in the location The raw water separator in the raw water flow channel and the d...

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Problems solved by technology

[0005] In the spiral membrane module of the prior art, the accumulation of organic or inorganic pollutants on the surface of the membrane first comes from the arrangement of the separator. The raw water separator of the membrane module in the current technology is usually as attached Figure 7 As shown, the diameters of the warp and weft wires are the same, and they intersect to form a square grid structure, which is arranged at a certain angle with the edge of the film bag, so that the raw water forms a flow direction and the raw water separator does not form a through flow channel, so the two wires in the warp and weft The part of the angle formed will form the deposition of inorganic or organic pollutants, resulting in fouling of the membrane surface

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