Chlorine-resistant anti-pollution nanofiltration membrane for soft water and preparation method thereof

An anti-pollution, nanofiltration membrane technology, applied in water/sewage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc. Pollution performance and other issues, to achieve the effect of chlorine resistance and anti-pollution performance improvement, excellent chlorine resistance and anti-pollution performance, and excellent hardness removal ability

Active Publication Date: 2020-08-11
WANHUA CHEM GRP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, nanofiltration membranes prepared by changing the surface charge properties of the polyamide layer will encounter many problems in practical use.
For example, since the surface of most colloidal particles present in natural water bodies is usually negatively charged, the surface of positively charged nanofiltration membranes will cause serious pollution problems due to the adsorption of colloidal particles
In addition, since municipal tap water pretreatment usually adds sterilizing agents such as sodium hypochlorite and chlorine dioxide, the raw water often contains a certain concentration of residual active chlorine, and the abundant amino groups on the surface o...

Method used

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  • Chlorine-resistant anti-pollution nanofiltration membrane for soft water and preparation method thereof
  • Chlorine-resistant anti-pollution nanofiltration membrane for soft water and preparation method thereof
  • Chlorine-resistant anti-pollution nanofiltration membrane for soft water and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0062] (1) Preparation of polysulfone-based membrane: 18wt% polysulfone and 1.0wt% copovidone VA64 were dissolved in N,N-dimethylformamide to prepare a casting solution, and then the casting solution was scraped on On a polyester non-woven fabric with a thickness of 150 μm, immersed in a 25°C water bath for 30 seconds to form a phase inversion film, take it out to obtain a polysulfone-based film;

[0063] (2) Preparation of polypiperazine amide layer: the polysulfone base membrane obtained in step (1) is fixed, and the prepared aqueous solution containing 1.5wt% PIP and 2.0wt% trisodium phosphate is poured on the surface of the base membrane, The basement membrane is completely immersed in the aqueous phase solution, immersed for 2min at room temperature, and the residual solution on the surface of the basement membrane is removed after pouring off the aqueous phase solution, and then the prepared Isopar G oil phase solution containing 0.15wt% TMC is poured on the membrane surf...

Embodiment 2

[0066] The main difference between this example and Example 1 is that the co-polyvidone VA64 concentration in the casting solution in the step (1) is 0.5wt%.

Embodiment 3

[0068] The main difference between this example and Example 1 is that the co-polyvidone VA64 concentration in the casting solution in the step (1) is 5.0 wt%.

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Abstract

The invention provides a chlorine-resistant anti-pollution nanofiltration membrane for soft water and a preparation method of the nanofiltration membrane. The nanofiltration membrane comprises a polysulfone base membrane, and the polysulfone base membrane is sequentially covered with a polypiperazine amide layer and a surface modification layer; wherein the surface modification layer is formed byreacting thiourea dioxide and polyvinyl alcohol on the surface of the polypiperazine amide layer. The nanofiltration membrane has the advantages of a traditional salt separation nanofiltration membrane and has excellent hardness removal capacity and chlorine resistance and anti-pollution performance, the chlorine resistance and anti-pollution performance of the modified nanofiltration membrane areremarkably improved, and the high calcium chloride rejection rate of the nanofiltration membrane can be maintained. The nanofiltration membrane prepared by the invention has a wide application prospect in the field of advanced treatment of municipal drinking water with hard water quality in a water source area or with underground water as a water source.

Description

technical field [0001] The invention belongs to the technical field of water treatment membranes, and in particular relates to a chlorine-resistant and pollution-resistant nanofiltration membrane for soft water and a preparation method thereof. Background technique [0002] Nanofiltration is a pressure-driven membrane separation process between reverse osmosis and ultrafiltration. The core of nanofiltration technology is nanofiltration membrane. The largest application field of nanofiltration membrane is the softening of drinking water and the removal of organic matter. Nanofiltration membranes can intercept microorganisms, bacteria and pathogens in water. Not only that, nanofiltration membranes can also effectively reduce water hardness, effectively remove chroma, heavy metals, and small molecule organic pollutants (natural organic matter, disinfection by-products, pesticides, endocrine disruptors, etc.) objects, personal protective equipment and medicines, etc.), thus gre...

Claims

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Application Information

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IPC IPC(8): B01D71/68B01D69/12B01D69/02B01D67/00B01D61/02C02F1/44
CPCB01D71/68B01D69/02B01D69/12B01D67/0013B01D61/027C02F1/442B01D2325/30
Inventor 孔新范琳阚红强赵永锋全晓赵伟国孙家宽
Owner WANHUA CHEM GRP CO LTD
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