Anti-pollution composite membrane, and making method and oil-water emulsion separation method thereof

A composite membrane, anti-pollution technology, applied in semi-permeable membrane separation, chemical instruments and methods, permeation/dialysis water/sewage treatment, etc., to achieve high anti-pollution performance, simple manufacturing process, and improve the effect of permeate water flux

Active Publication Date: 2017-07-14
SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, there is no research and application of composite membranes for the separation of oil-water emulsions with different charging properties. Correspondingly, in the preparation methods and application technologies of composite membranes, there is no research on the removal of different charging properties in oily wastewater. Corresponding pollution-resistant membrane separation materials for oil-water emulsions

Method used

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  • Anti-pollution composite membrane, and making method and oil-water emulsion separation method thereof
  • Anti-pollution composite membrane, and making method and oil-water emulsion separation method thereof

Examples

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preparation example Construction

[0035]The preparation method of the pollution-resistant composite membrane is also disclosed in the embodiment. Taking the hollow fiber sulfonated or aminated polymer-coated composite nanofiltration membrane as an example, it is prepared by the following steps: dissolving the sulfonated or aminated polymer in solvent, prepare a coating solution; then apply the coating solution to the inner surface of the nanofiltration base membrane to obtain a composite membrane; heat-treat the obtained composite membrane in an environment of 50-70°C for 5-10 hours, and dry Finally, a sulfonated or aminated polymer-coated composite nanofiltration membrane is obtained.

[0036] Wherein, the mass percent concentration of the sulfonated or aminated polymer in the coating solution is 0.01-10%, preferably 0.5-10%. The sulfonated polymer is selected from sulfonated polyether ether ketone, sulfonated polystyrene, sulfonated polyaniline, sulfonated polysulfone; or the aminated polymer is selected fro...

Embodiment 1

[0052] Dissolving sulfonated polyetheretherketone in methanol solution to prepare a solution with a sulfonated polymer concentration of 0.01%. Apply it to the PVDF flat base membrane (inner and outer diameters are 0.9mm and 1.4mm respectively) with a single coating, and treat the membrane for 6 hours in an environment of 65 degrees Celsius to obtain a composite membrane with an effective coating (that is, an effective separation layer) , the effective coating thickness of the sulfonated polyether ether ketone composite nanofiltration membrane is 0.01 μm, and the nanofiltration membrane is assembled into a hollow fiber membrane module and used as attached figure 1 The process shown is for degreasing.

[0053] The raw material liquid is oily wastewater, and sodium dodecylsulfonate is added to obtain stable emulsified oil. Here and in the following several examples, the synthetic emulsified oil used in the experiment is adopted, and the main component of the waste water itself i...

Embodiment 2

[0055] Dissolve sulfonated polyethersulfone in methanol solution to prepare a coating solution with a high molecular concentration of 5.0%, and coat it on the PES flat base film (the base film MWCO is 100000Da, the ratio of internal and external diameters is 0.9 / 1.3mm), 65 degrees The membrane was post-treated for 6 hours in the environment to obtain a composite membrane. The effective coating thickness of the sulfonated polyether ether ketone composite nanofiltration membrane was 1 μm. figure 1 Degreasing is carried out in the process shown.

[0056] The raw material liquid is oily wastewater, and sodium hexadecylsulfonate is added to obtain stable emulsified oil. During the operation, adjust the pressure pump and valve to make the pressure reach 6bar. The oil content in the permeated water cannot be detected, which meets the first-level discharge standard of the "Integrated Wastewater Discharge Standard" (GB8978-1996). During the operation of the device, the permeate water...

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Abstract

The invention relates to an anti-pollution composite membrane, and a making method and an oil-water emulsion separation method thereof, and discloses an anti-pollution composite membrane used for different charged oil-water emulsions and having corresponding charging performance, and a making method and an oil-water emulsion separation method thereof. The anti-pollution composite membrane comprises a base membrane and an effective separation layer coating the internal surface of the base membrane, the effective separation layer is a sulfonated polymer coating used for carrying out screening and charge repulsion on a negatively-charged oil-water emulsion or an aminated polymer coating used for carrying out screening and charge repulsion on a positively-charged oil-water emulsion, and the composite membrane has negatively or positively charging performance after undergoing treatment and adsorption in a surfactant solution containing anions or cations. The composite membrane can remove different charged emulsified oil and has very high anti-pollution performance, so the emulsified oil in water is effectively intercepted, the quality of outlet water is improved, and the treatment cost is low.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a pollution-resistant composite membrane material for removing oils with different charges in wastewater, and a preparation method and application of the material. Background technique [0002] Oily wastewater pollution may cause devastating damage to the ecosystem and also cause potential harm to human health. With the development of industry, the amount of oil extraction is increasing. However, due to the lag of development of various technologies and imperfect management, a large amount of oil enters the water body and causes pollution. The pollution of oily wastewater mainly affects drinking water resources and groundwater resources, endangers aquatic resources, endangers human health, pollutes the atmosphere, affects crop production, destroys natural landscapes, and may even cause safety problems due to the burning of coalesced oil products. In view of the polluti...

Claims

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Application Information

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IPC IPC(8): B01D71/06B01D69/12B01D69/02B01D67/00C02F1/44
CPCB01D67/0002B01D67/0088B01D69/02B01D69/12B01D71/06C02F1/44
Inventor 何涛金桐辉宋健峰赵宝龙赵书威殷勇窦鹏佳
Owner SHANGHAI ADVANCED RES INST CHINESE ACADEMY OF SCI
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