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Composite catalytic membrane, and photo-catalytic oxidation-membrane distillation multi-dimensional sewage disposal system and disposal method

A sewage treatment system, photocatalytic oxidation technology, applied in the directions of oxidized water/sewage treatment, light water/sewage treatment, water/sewage treatment, etc., can solve problems such as the inability to completely eliminate pollutants

Inactive Publication Date: 2020-11-20
INST OF PROCESS ENG CHINESE ACAD OF SCI
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  • Description
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Problems solved by technology

Among them, compared with other pressure-driven membrane separation technologies such as nanofiltration membranes, microfiltration membranes, and ultrafiltration membranes, membrane distillation technology can more effectively concentrate organic pollutants and inorganic ions and separate them from water, but it still cannot completely eliminate pollutants have certain limitations

Method used

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  • Composite catalytic membrane, and photo-catalytic oxidation-membrane distillation multi-dimensional sewage disposal system and disposal method

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preparation example Construction

[0073] The present invention also provides a kind of method for preparing above-mentioned composite catalytic membrane, and described preparation method specifically comprises the following steps:

[0074] (1) Preparation of superhydrophobic base film 6 by electrospinning method: dissolve PEO (polyethylene oxide) in deionized water, and stir at constant temperature to obtain transparent solution A; quickly stir hydrophobic film material and A solution at room temperature to obtain spun Silk liquid B; put the spinning liquid B into the syringe, set the operating parameters of the electrospinning, start spinning, and control the thickness of the PTFE super-hydrophobic membrane by the time of the electrospinning.

[0075] (2) Preparation of composite catalytic membrane by electrospinning method: dissolve photocatalyst powder, PEO and hydrophobic membrane material in a solvent in a certain proportion, stir to obtain spinning solution, and obtain superhydrophobic base membrane in st...

Embodiment 1

[0083] This embodiment provides a TiO 2 The preparation method of / PTFE composite catalytic membrane, described preparation method comprises the steps:

[0084] (1) Preparation of PTFE superhydrophobic base film by electrospinning method: Dissolve PEO (polyethylene oxide) in deionized water and stir at 20°C for 4 hours to obtain a transparent solution A; fix the mass ratio of PEO and PTFE to 1:10 , take the corresponding PTFE emulsion and A solution, stir rapidly at 20°C for 3 hours to obtain the spinning solution B; put the spinning solution B into a syringe, and prepare for spinning. The operating conditions of electrospinning are set as: voltage 20kV, drum speed 1000rpm, spinning solution B feeding speed is 0.5mL / h, and the thickness of the PTFE superhydrophobic membrane is controlled by the time of electrospinning;

[0085] (2) Preparation of TiO by electrospinning 2 / PTFE composite catalytic membrane: the mass ratio of fixed catalyst, PEO and PTFE is 0.2:1:10, and TiO 2...

Embodiment 2

[0087] This embodiment provides a C 3 N 4 The preparation method of / PVDF composite catalytic film, described preparation method comprises the steps:

[0088] (1) Preparation of PVDF superhydrophobic base film by electrospinning method: Dissolve PEO (polyethylene oxide) in deionized water and stir at 40°C for 3 hours to obtain a transparent solution A; fix the mass ratio of PEO and PVDF to 1:10 , take PVDF emulsion and A solution, stir rapidly at 40°C for 2 hours to obtain spinning solution B; put spinning solution B into a syringe, and prepare for spinning. Set the operating conditions of electrospinning as follows: voltage 10kV, drum speed 500rpm, spinning solution B feed rate 0.3mL / h, the thickness of the PTFE superhydrophobic membrane is controlled by the time of electrospinning;

[0089] (2) Preparation of C by electrospinning 3 N 4 / PVDF composite catalytic membrane: the mass ratio of fixed catalyst, PEO and PTFE is 0.3:1:10, and C 3 N 4 The photocatalyst powder, PE...

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Abstract

The invention provides preparation of a composite catalytic membrane, and a photo-catalytic oxidation-membrane distillation multi-dimensional sewage disposal system and disposal method. The compositecatalytic membrane comprises a hydrophobic basal membrane and photo-catalytic materials modifying the surface of the basal membrane. The multi-dimensional sewage disposal system comprises a feeding unit and a membrane distillation unit which are connected in sequence based on a sewage disposal process route; the membrane distillation unit comprises a membrane distillation device; the composite catalytic membrane is arranged inside the membrane distillation device in the direction perpendicular to the flow direction of sewage; a light source is arranged on the outer part of the membrane distillation device; and photocatalyst particles are added to sewage entering the membrane distillation device. Via light source irradiation, the processes of photo-catalytic oxidation and membrane distillation desalination are coupled in the same unit, and at the same time gas is introduced for enhancing mass transfer and reaction. Multi-dimensional catalytic oxidation is realized by a suspended state catalyst and an intramembrane fixed state catalyst, the effect of removing organic substances and microorganisms is enhanced, and membrane pollution is reduced.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and relates to a composite catalytic membrane, a membrane distillation sewage treatment system and a treatment method, in particular to a composite catalytic membrane, a photocatalytic oxidation-membrane distillation multidimensional sewage treatment system and a treatment method. Background technique [0002] With the wide application of reverse osmosis technology in the industrial field, the problem of reverse osmosis concentrated brine and high-salt wastewater has become increasingly prominent. For example, in some coal chemical companies, the company itself cannot absorb high-salt wastewater and stores it in evaporation ponds, which is harmful to the ecology. Environmental threats are high. High-salt wastewater desalination technologies mainly include thermal and membrane technologies. As a new thermal-membrane technology, membrane distillation has developed rapidly. It has the advan...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): D04H1/728D01D5/00B01J35/06C02F1/30C02F1/32C02F1/44C02F1/72C02F1/74C02F1/78
CPCD04H1/728D01D5/0084D01D5/003C02F1/30C02F1/32C02F1/725C02F1/727C02F1/74C02F1/78C02F1/447C02F2305/10B01J21/063B01J27/24B01J23/06B01J27/04B01J35/59Y02A20/131
Inventor 段锋李玉平曹宏斌
Owner INST OF PROCESS ENG CHINESE ACAD OF SCI
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