Electrochemical-membrane separation water treating device, treating method and application thereof

A technology of water treatment device and treatment method, which is applied in chemical instruments and methods, sterilization/microdynamic water/sewage treatment, water/sewage treatment, etc. Change the molecular structure, slow down membrane fouling, and improve the effect of effluent quality

Active Publication Date: 2017-12-12

RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI

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AI-Extracted Technical Summary

Problems solved by technology

However, there is still the problem of high energy consumption, and the existing method of combining electr...

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Method used

Comprehensive above-mentioned embodiment and comparative example can find out, the present invention is by electric field effect, electrochemical oxidation and electric buoyancy, with the film in membrane module as base film, forms a layer of new tool semi-permeable on it The filter cake layer is used as a new membrane structure to modify pollutants into membrane materials, thereby reducing membrane fouling and improving the water treatment performance of the device.

It can be seen that the membrane flux after membrane module pollution in CN 104787940A is significantly lower than that of Example 1, and its hydrophilicity is infer...

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Abstract

The invention provides an electrochemical-membrane separation water treating device, a treating method and an application thereof. The electrochemical-membrane separation water treating device comprises a reaction tank, wherein the reaction tank is internally provided with a membrane component; one side of the membrane component is provided with a sensing electrode and an anode plate from inside to outside in a manner of being parallel to the membrane component; the other side of the membrane component is provided with a cathode plate parallel to the membrane component; the anode plate and the cathode plate are connected with an external power supply; a water inlet is arranged at one side of a main body of the reaction tank; and a water outlet of the membrane component is arranged on the main body of the reaction tank and is connected with the membrane component. The electrochemical-membrane separation water treating device, the treating method and the application provided by the invention have the advantages that electric-field effect, electrochemical oxidation, electroflocculation and electroflotation are integrated, and by the action of electrooxidation and electroflocculation, the structure of pollutants is changed, the size of particles is adjusted, and a hydrophilic and porous filter cake layer is formed on the membrane surface, so that the pollution to the membrane is reduced; and the solid-liquid separation is carried out by membrane filtration, so that the quality of discharged water is further improved.

Application Domain

Water/sewage treatment bu osmosis/dialysisWater/sewage treatment using germicide/oligodynamic-process

Technology Topic

Electric fieldPollutant +8

Image

Examples

Experimental program(3)
Comparison scheme(7)
Effect test(1)

Example Embodiment

[0050] Example 1:

[0051] This embodiment provides an electrochemical-membrane separation water treatment device and a treatment method thereof. The device includes a reaction tank 5 in which a membrane module 4 is arranged, and one side of the membrane module 4 is parallel from the inside to the outside A sensing electrode 2 and an anode plate 1 are arranged on the membrane assembly 4, the other side of the membrane assembly 4 is arranged with a cathode plate 3 parallel to the membrane assembly 4, and the anode plate 1 and the cathode plate 3 are connected to an external power source 9;

[0052] A water inlet 6 is provided on one side of the main body of the reaction tank 5, and a water return port 7 is provided on the side opposite to the water inlet; the main body of the reactor 5 is provided with a membrane module water outlet 8. The membrane module water outlet 8 and the membrane module 4 Connected.

[0053] Wherein, the anode plate 1 is a titanium ruthenium electrode; the number of anode plates 1 is one.

[0054] The sensing electrode 2 is a sensing aluminum electrode; the number of sensing electrodes 2 is one.

[0055] The cathode plate 3 is an aluminum cathode; the number of the cathode plate 3 is one.

[0056] The membrane module 4 is a curtain flat membrane; the membrane element in the membrane module 4 is a microfiltration membrane.

[0057] The device is used to treat drinking water, the TOC content of the drinking water is 5ppm, the turbidity is 38NTU, and the processing capacity is 2500L·m -2 ·H -1.

[0058] The processing method is:

[0059] (a) Pass the water to be treated through the water inlet 6 of the reaction tank 5, start the electrochemical device, and adjust the current density to 5A/m 2 , The transmembrane pressure difference is 30kPa, the process of electric flocculation, electrochemical oxidation and electrolysis is carried out to form a filter cake layer on the surface of the membrane module 4;

[0060] (b) Start the power unit, perform membrane filtration treatment, and discharge the treated water body from the water outlet 8 of the membrane module.

[0061] In this embodiment, the membrane flux after pollution in step (a) is 1965L·m -2 ·H -1 , The contact angle is 67.75°, the apparent porosity of the filter cake layer is 16.73%, and the pore size of the filter cake layer is 10 nm.

[0062] The TOC content in the drinking water obtained after the treatment is 0-0.5ppm, the turbidity drops to 0NTU, and the pollutant separation efficiency is 98%.

Example Embodiment

[0063] Example 2:

[0064] This embodiment provides an electrochemical-membrane separation water treatment device and a treatment method thereof. The structure of the device is referred to embodiment 1. The difference is that the number of anode plates 1 is two, and the number of cathode plates 3 is Two, the membrane module 4 is a hollow fiber membrane; the membrane element in the membrane module 4 is an ultrafiltration membrane.

[0065] The device is used to treat industrial sewage, in which the TOC content is 450ppm, the turbidity is 60NTU, and the processing capacity is 3000L·m -2 ·H -1.

[0066] The processing method refers to Example 1, the difference is: in step (1), the current density is adjusted to 10A/m 2 , The transmembrane pressure difference is 35kPa.

[0067] In this embodiment, the membrane flux after pollution in step (a) is 2463L·m -2 ·H -1 , The contact angle is 64.22°, the apparent porosity of the filter cake layer is 14.77%, and the pore size of the filter cake layer is 13 nm.

[0068] The TOC content in the drinking water obtained after the treatment is 1 ppm, the turbidity is reduced to 0 NTU, and the pollutant separation efficiency is 97%.

Example Embodiment

[0069] Example 3:

[0070] This embodiment provides an electrochemical-membrane separation water treatment device and a treatment method thereof. Refer to Embodiment 1 for the structure of the device.

[0071] The device is used to treat industrial wastewater, in which the TOC content is 450ppm, the turbidity is 60NTU, and the processing capacity is 3500L·m -2 ·H -1.

[0072] The processing method refers to Example 1, the difference is: in step (1), the current density is adjusted to 15A/m 2 , The transmembrane pressure difference is 25kPa.

[0073] In this embodiment, the membrane flux after pollution in step (a) is 2990.75L·m -2 ·H -1 , The contact angle is 61.34°, the apparent porosity of the filter cake layer is 15.87%, and the pore size of the filter cake layer is 16 nm.

[0074] The drinking water obtained after treatment has a TOC content of 0.5 ppm, a turbidity reduced to 0 NTU, and a pollutant separation efficiency of 97%.

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PUM

Property	Measurement	Unit
Membrane flux	1780.0	l/h/m²
Aperture	5.0	nm
Aperture	20.0	nm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Mitigation of membrane fouling
Improve hydrophilicity

Electrochemical-membrane separation water treating device, treating method and application thereof

A technology of water treatment device and treatment method, which is applied in chemical instruments and methods, sterilization/microdynamic water/sewage treatment, water/sewage treatment, etc. Change the molecular structure, slow down membrane fouling, and improve the effect of effluent quality

AI-Extracted Technical Summary

Problems solved by technology

Method used

Abstract

Image

Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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