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Preparation method of self-assembly nanofiltration separation membrane for high salinity and high ammonia nitrogen wastewater

A high ammonia nitrogen, nanofiltration membrane technology, applied in semi-permeable membrane separation, chemical instruments and methods, membrane technology and other directions, can solve problems such as membrane fouling

Inactive Publication Date: 2014-06-11
SHENYANG POLYTECHNIC UNIV
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  • Abstract
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  • Application Information

AI Technical Summary

Problems solved by technology

However, there are still many problems in the application of nanofiltration membrane separation technology, especially membrane fouling.

Method used

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  • Preparation method of self-assembly nanofiltration separation membrane for high salinity and high ammonia nitrogen wastewater

Examples

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Embodiment 1

[0019] A typical high-salinity waste liquid: trona mother liquor recovery nanofiltration membrane process:

[0020] Using acetone as the dispersant, and then using the polysulfone ultrafiltration membrane prepared by the L-S phase inversion method as the base membrane, the static layer-by-layer self-assembly technology was used to prepare polydiallyldimethylammonium chloride / polyethylene oxide in the sodium chloride system. Sodium styrene sulfonate multi-layer polyelectrolyte nanofiltration membrane, for desalination and recovery of ammonia nitrogen components, using PST surface modification additive at 50°C to modify the surface properties of nanofiltration membrane materials for 24 hours, and can be based on the ion The type, concentration, and number of self-assembled layers adjust the modification strength. In the process of treating trona to prepare and discharge waste liquid, the nanofiltration high-salinity lye wastewater desalination and solvent component recovery proc...

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Abstract

The invention discloses a preparation method of a self-assembly nanofiltration separation membrane for high salinity and high ammonia nitrogen wastewater, and the nanofiltration separation membrane is used for the treatment of high ammonia nitrogen and high salinity wastewater. Polysulfone ultrafiltration membrane is used as a basic membrane; static layer-by-layer self-assembly technique is employed; and a PST surface modifier of nanofiltration membrane material aiming at desalination of high salinity and high ammonia nitrogen wastewater and recycling of ammonia nitrogen components is developed; and poly diallyl dimethyl ammonium chloride (PDADMAC) / sodium polystyrene sulfonate (PSS) multilayer polyelectrolyte nanofiltration membrane is prepared. Aiming at the influences of species, concentration and self-assembly layer of ions on separation performance, charge property and hydrophilicity of the membrane, the surface properties of nanofiltration membrane are adjusted; and according to the retention rate of nanofiltration membrane on different ions in waste water under different operation conditions and change of membrane flux and recovery rate, targeted membrane material and technology for desalination of high salinity alkali wastewater and separation of ammonia nitrogen are developed.

Description

technical field [0001] The invention relates to a method for preparing an industrial wastewater separation membrane material, in particular to a method for preparing a self-assembled nanofiltration separation membrane for high-salt and high-ammonia-nitrogen wastewater treatment. Background technique [0002] At present, it is still impossible to apply biological methods to treat high-concentration ammonia nitrogen and high-salinity wastewater to meet the standards. However, the chemical oxidation method for deamination is very expensive and wastes resources. Deamination by chemical precipitation is not only costly, but also has a large amount of by-products, and there is no commodity market for by-products. The stripping method has disadvantages such as low efficiency, long time consumption, difficulty in collecting ammonia gas, and easy air pollution. Membrane deamination usually has problems such as short life of membrane materials, difficult maintenance, high cost of me...

Claims

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Application Information

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IPC IPC(8): B01D67/00B01D71/68B01D71/44B01D71/28B01D69/12
Inventor 张林楠刘琦洪维哲
Owner SHENYANG POLYTECHNIC UNIV
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