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

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...

AI Technical Summary

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

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