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Method for separating high-salt-containing concentrated water by light-assisted catalytic membrane for decoloration

A high-salt, light-assisted technology, which is applied in chemical instruments and methods, special compound water treatment, light water/sewage treatment, etc., can solve the difficulty of increasing engineering of equipment stability, increasing the cost of catalyst recycling, ozone Problems such as high investment cost and operating cost, achieve the effect of adding a secondary enhanced catalytic system, avoiding high investment cost and operating cost, and avoiding safety accidents

Inactive Publication Date: 2018-08-10
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The current membrane separation concentrated water treatment method, such as patent CN 101786689 A, membrane separation concentrated water enters the suspension type photocatalytic reaction system, and assists microwave at the same time, not for high salt concentrated water, the catalyst is in a suspended state, and the catalyst is used to increase recovery Cost, microwave assistance increases additional cost, and increases the noise of the operating environment; patent CN 104016511 A, photocatalytic ozone combined with advanced treatment of wastewater, membrane separation and recovery of catalyst, ozone investment cost and operating cost are high, and the stability of the equipment is increased by engineering Difficulty is also a factor that limits its wide application, and it is not aimed at the treatment of high brine content; patent CN 104773886 A titanium dioxide photocatalysis of organic matter in drinking water, ultrafiltration membrane recovery catalyst, nor for industrial wastewater; patent CN 105858981 A, membrane separation Concentrated salt water is separated into resources, and the photocatalytic device is connected to the fresh water port of the membrane concentration device to treat the fresh water and discharge it up to the standard, not to treat the concentrated water to improve the salt quality
[0005] In the search of existing technologies, light-assisted catalysis, adding oxidants, decolorization of high-salt concentrated water produced by membrane separation, and enhanced catalytic system treatment of the high-salt mother liquor produced to improve the quality of salt and the stability of the evaporation system The technology to achieve zero emission has not been reported

Method used

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  • Method for separating high-salt-containing concentrated water by light-assisted catalytic membrane for decoloration
  • Method for separating high-salt-containing concentrated water by light-assisted catalytic membrane for decoloration
  • Method for separating high-salt-containing concentrated water by light-assisted catalytic membrane for decoloration

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0051] According to attached figure 2 The process structure shown is implemented:

[0052] S1: Concentrated electrodialysis water in a petrochemical industry contains 7.2-10.5% sodium chloride by weight, chroma 410, and COD 3250. Take 300ml and add it to a 1000ml beaker.

[0053] Use isopropyl titanate to hydrolyze under the condition of 0.2mol / L nitric acid aqueous solution, the hydrolysis temperature is 60°C, the time is 8h, apply it on the FTO conductive glass, and then bake it at 500°C for 2h to obtain nc-TiO 2 / FTO. The thickness of the catalyst is 1.2 μm, the cut area is 6cm×5cm, and the nc-TiO 2 / FTO was put into the beaker, and the distance between the catalyst and the liquid surface was adjusted to be 2cm.

[0054] S2: Infuse air from below the catalyst, balance for 30 minutes, and add 0.5% sodium hypochlorite;

[0055] S3: A 500W xenon lamp is used as the light source, and the light spot shines vertically on the liquid surface of the catalyst from the top of the...

Embodiment 2

[0059] According to attached image 3 The process structure shown is implemented:

[0060] S1: Concentrated electrodialysis water in a petrochemical industry contains 7.2-10.5% sodium chloride by weight, chroma 410, and COD 3250. Take 300ml and add it to a 1000ml beaker.

[0061] Use isopropyl titanate to hydrolyze under the condition of 0.2mol / L nitric acid aqueous solution, the hydrolysis temperature is 60°C, the time is 8h, apply it on the FTO conductive glass, and then bake it at 500°C for 2h to prepare nc-TiO 2 / FTO. The thickness of the catalyst is 1.2 μm, the cut area is 6cm×5cm, and the nc-TiO 2 / FTO was put into the beaker, and the distance between the catalyst and the liquid surface was adjusted to be 2cm.

[0062] S2: Infuse air from below the catalyst, balance for 30 minutes, and add 0.5% hydrogen peroxide;

[0063] S3: A 500W xenon lamp is used as the light source, and the light spot shines vertically on the liquid surface of the catalyst from the top of the b...

Embodiment 3

[0067]According to attached Figure 4 The process structure shown is implemented:

[0068] Electrodialysis concentrated water in a petrochemical industry contains 7.2-10.5% sodium chloride by weight, 410 chroma, and 3250 COD. Take 300ml, add 300ml to a 500ml round bottom flask, heat with an electric furnace, distill under reduced pressure, and evaporate About 200ml of water was produced, a large amount of salt was precipitated, the heating was stopped, and the brine was separated by centrifugation to obtain 9.3g of sodium chloride. The salt was slightly yellow, and it was obvious that viscous organic matter remained in the salt.

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Abstract

The invention discloses a membrane separation concentrated-brine utilization technology, and in particular relates to a method for separating high-salt-containing concentrated water by a light-assisted catalytic membrane for decoloration and improving salt quality. The method adopts a fixed-bed catalyst, a plurality of oxidants are added, a processing membrane is used to separate the high-salt-containing concentrated water under light source excitation conditions, organic matter with a larger molecular structure is catalyzed the oxidized, and organic matter with a smaller molecular structure and no color or weak coloring ability is generated, so that chromaticity of the brine is reduced, and a part of COD is removed; and a mother liquor produced after the brine is separated is treated by adopting an enhancing catalytic system, so that quality of produced salt and stability of an evaporation system are improved, and zero emission is realized. The method provided by the invention has theadvantages that no new impurity oxidant is introduced, the problem of difficulty in catalyst recovery does not exist, the chromaticity of the obtained salt and the stability of the evaporation systemare ensured, and wastewater recycling and zero emission are truly realized.

Description

technical field [0001] The invention relates to membrane separation concentrated brine utilization technology, in particular to a method for photo-assisted catalytic membrane separation of high-salt concentrated water decolorization to improve the quality of salt separation, which belongs to the field of environmental protection, energy saving, resource recovery and utilization. Background technique [0002] The application of membrane separation technology in the field of environmental protection is becoming more and more common, especially for industries with large water consumption such as petrochemical, coal chemical, steel, printing and dyeing industries. Utilization efficiency, on the one hand, is to improve the efficiency of process water, and on the other hand, to improve the efficiency of secondary water use. Under such an environmental protection situation and the limitations of the industry's own characteristics, it is very common for membrane separation technology...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10
CPCC02F1/04C02F1/22C02F1/30C02F1/44C02F1/722C02F1/725C02F1/76C02F9/00C02F2305/023C02F2305/10
Inventor 李想吴雅琴杨波张高旗朱圆圆
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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