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Method and device for deeply treating wastewater by coupling PVDF/ZnO piezoelectric ultrafiltration membrane to advanced oxidation technology

An advanced oxidation technology and advanced treatment technology, which is applied in the field of PVDF/ZnO piezoelectric ultrafiltration membrane coupling advanced oxidation technology advanced treatment of wastewater, can solve the problems of increased conductivity, large influence, and limited application area, etc., to improve the service life of the membrane , Improve the quality of effluent water and reduce the effect of secondary pollution

Active Publication Date: 2018-02-27
KUNMING UNIV OF SCI & TECH
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Problems solved by technology

Due to the low cost, easy film formation and good filtration performance of polyvinylidene fluoride (PVDF), it has become the main film-forming material for ultrafiltration membranes. However, PVDF ultrafiltration membranes are used for advanced treatment of wastewater, and their hydrophilicity is poor. Microorganisms and Organic matter is easy to attach to the surface, causing irreversible membrane fouling, reducing the flux of the membrane, and making the effluent quality worse, which not only increases the cost, but also the effluent quality cannot meet the needs of people's lives; membrane fouling is the fundamental problem restricting its development
[0004] Membrane fouling is a common problem of PVDF ultrafiltration membranes. Ultrafiltration membrane fouling mainly includes adsorption pollution, clogging pollution, concentration polarization pollution, gel layer pollution, and comprehensive pollution. In the face of ultrafiltration membrane fouling, people try to improve water quality , backwash, change hydrophilicity, increase conductivity etc. to solve, as CN 106110902 A enhances the hydrophilicity of filter membrane by adding zinc oxide in PVDF filter membrane, also has antibacterial effect simultaneously, and this method has certain effect on membrane fouling It is improved, but it cannot prevent other pollutants from polluting the filter membrane.
[0005] Advanced oxidation technology is also a commonly used method in the advanced treatment of wastewater. In order to reduce secondary pollution, chlorine oxidation technology is gradually replaced by ozone oxidation technology. In order to improve the quality of effluent water, several advanced oxidation technologies are often used together for wastewater treatment. Advanced treatment, such as CN105314705A, uses ozone, ultraviolet radiation and photocatalysis to treat wastewater synergistically. Although this method has strong oxidation ability, these technologies are greatly affected by the quality of influent water. If there are many microorganisms and macromolecular organic substances in the wastewater, these technologies often cannot achieve Process requirements

Method used

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  • Method and device for deeply treating wastewater by coupling PVDF/ZnO piezoelectric ultrafiltration membrane to advanced oxidation technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] Example 1: The PVDF / ZnO piezoelectric ultrafiltration membrane is prepared by a conventional phase inversion method to obtain a PVDF / ZnO ultrafiltration membrane with a thickness of 500 μm. It is obtained by 8KV DC high-voltage polarization for 120 minutes under vacuum conditions at 40°C. The specific preparation Methods as below:

[0025] Add nano-ZnO to the NMP solvent, ultrasonic 1h, and magnetically stir for 1h, so that the nano-ZnO is evenly dispersed in the NMP solvent. At this time, PVDF powder is added to the NMP solvent mixed with nano-ZnO. The mass ratio of PVDF powder to nano-ZnO is 2:1, wherein the total mass of PVDF and nano-ZnO accounted for 15% of the total mass of the casting solution, mechanically stirred in a water bath at 30°C for 8 hours, and then stood in a vacuum environment for 12 hours for defoaming treatment to obtain the casting solution; The film scraping machine evenly distributes the casting solution on the glass plate to form a film, bakes ...

Embodiment 2

[0033] Example 2: The PVDF / ZnO piezoelectric ultrafiltration membrane is prepared by a conventional phase inversion method to obtain a PVDF / ZnO ultrafiltration membrane with a thickness of 750 μm. It is obtained by 15KV DC high-voltage polarization for 90 minutes under vacuum conditions at 50°C. The specific steps Referring to Example 1, during preparation, the mass ratio of PVDF powder to nano-ZnO was 1.5:1, wherein the total mass of PVDF and nano-ZnO accounted for 18% of the total mass of the casting liquid, the solvent was DMAc, and the extractant was absolute ethanol.

[0034] Utilize PVDF / ZnO piezoelectric ultrafiltration membrane coupled with advanced oxidation technology for advanced treatment of wastewater, pass the untreated wastewater and ozone through PVDF / ZnO piezoelectric ultrafiltration membrane, and the concentration of ozone introduced is 6g / (L h), PVDF / ZnO The piezoelectric ultrafiltration membrane is connected to an AC power supply to provide a transmembrane p...

Embodiment 3

[0041] Example 3: The PVDF / ZnO piezoelectric ultrafiltration membrane is prepared by a conventional phase inversion method to obtain a PVDF / ZnO ultrafiltration membrane with a thickness of 1000 μm. It is obtained by 20KV DC high-voltage polarization for 40 minutes under vacuum conditions at 45°C. The specific steps Referring to Example 1, during preparation, the mass ratio of PVDF powder to nano-ZnO is 3:1, wherein the total mass of PVDF and nano-ZnO accounts for 30% of the total mass of the casting liquid, the solvent is DMF, and the extractant is absolute ethanol.

[0042] Utilize PVDF / ZnO piezoelectric ultrafiltration membrane coupled with advanced oxidation technology for advanced treatment of wastewater, pass the untreated wastewater and ozone through PVDF / ZnO piezoelectric ultrafiltration membrane, the concentration of ozone introduced is 8g / (L h), PVDF / ZnO The piezoelectric ultrafiltration membrane is connected to an AC power supply to provide a transmembrane pressure in...

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Abstract

The invention discloses a method and a device for deeply treating wastewater by coupling a PVDF / ZnO piezoelectric ultrafiltration membrane to an advanced oxidation technology. Wastewater to be treatedand ozone pass through the PVDF / ZnO piezoelectric ultrafiltration membrane, the PVDF / ZnO piezoelectric ultrafiltration membrane is connected with an alternating current power supply to provide a transmembrane pressure in a vacuumizing form, and ultraviolet lamps which are arranged on the two sides of the PVDF / ZnO piezoelectric ultrafiltration membrane are turned on at the same time; the wastewater is subjected to the filter effect of the PVDF / ZnO piezoelectric ultrafiltration membrane, ozonation, ultraviolet radiation and the photocatalytic oxidation effect to be purified finally, and the PVDF / ZnO piezoelectric ultrafiltration membrane realizes a self-cleaning effect under the action of the alternating current power supply; the method solves the problems that the membrane filter technology cannot effectively remove small molecule pollutants, and an advanced oxidation technology cannot effectively oxidize large molecule pollutants, the two technologies are organically coupled to each other and are complementary in advantages, and the piezoelectric effect of the PVDF / ZnO piezoelectric ultrafiltration membrane is utilized at the same time, so that membrane pollution is effectively inhibited.

Description

technical field [0001] The invention belongs to the field of advanced water treatment, and in particular relates to a method and a device for advanced treatment of wastewater with a PVDF / ZnO piezoelectric ultrafiltration membrane coupled with an advanced oxidation technology. Background technique [0002] With the improvement of health awareness, people have higher and higher requirements for the safety and sanitation of drinking water. Coupled with the enhancement of environmental protection concepts, stricter sewage discharge standards, regardless of urban sewage treatment or water treatment, the requirements for the quality of discharged water Higher and higher. The traditional advanced treatment process of coagulation-sedimentation-disinfection can no longer meet the discharge requirements. Membrane separation technology has become an indispensable technology for advanced treatment of drinking water. Among them, ultrafiltration membrane technology is a membrane separatio...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/30
CPCC02F9/00C02F1/32C02F1/444C02F1/78C02F2101/30
Inventor 瞿广飞杜彩东任南琪解若松李晓芬高海均何艳华宁平
Owner KUNMING UNIV OF SCI & TECH
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