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Method for removing COD (chemical oxygen demand) from film separation strong brine by electro-catalytic treatment

A technology for electrocatalysis and membrane treatment, applied in chemical instruments and methods, chemical/physical processes, physical/chemical process catalysts, etc., to achieve the effects of reducing energy consumption, high catalytic activity, and increasing contact probability and time

Active Publication Date: 2019-05-07
HANGZHOU WATER TREATMENT TECH DEV CENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In this study, the electrocatalytic packed catalyst was generated in situ on the surface of activated carbon without high temperature treatment, and the technology of adding it to the electrocatalytic system to treat high-salt concentrated water separated by membrane has not been reported.

Method used

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  • Method for removing COD (chemical oxygen demand) from film separation strong brine by electro-catalytic treatment
  • Method for removing COD (chemical oxygen demand) from film separation strong brine by electro-catalytic treatment
  • Method for removing COD (chemical oxygen demand) from film separation strong brine by electro-catalytic treatment

Examples

Experimental program
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Effect test

Embodiment 1

[0043] Catalyst preparation, columnar activated carbon, diameter 2-4mm, length 5-7mm, specific surface area 790m2 / g, take 1kg columnar activated carbon and bake at 105°C for 8h, then cool to room temperature. Weigh 8g of potassium permanganate and add it to 1.2L of water, then add 1kg of pretreated activated carbon, after 2 hours of reaction, the solution becomes colorless, pour off the supernatant, add clear water to wash twice, dry at room temperature, and Drying at 80° C. for 8 hours to prepare an in-situ-generated manganese oxide activated carbon-carrier electrocatalyst, the weight ratio of manganese to the weight of activated carbon is 0.28%.

[0044] The three-dimensional electrocatalytic system is assembled. The anode is a titanium substrate ruthenium oxide coated electrode, and the cathode is a titanium plate. The area of ​​the cathode and anode electrodes is 6cm×10cm, and the effective area is about 50cm2. There are nine pairs of electrode plates, arranged in threes an...

Embodiment 2

[0047] Catalyst preparation, weigh 20g of potassium permanganate and add it to 1.2L of water, then add 1kg of pretreated activated carbon, after 5 hours of reaction, the solution becomes colorless, pour off the supernatant, add water to wash twice, and dry at room temperature Finally, it was dried at 80° C. for 8 hours to prepare an in-situ generated manganese oxide activated carbon-carrier electrocatalyst, and the weight ratio of manganese to the weight of activated carbon was 1.39%.

[0048] Other is with embodiment 1, and result COD is 470, and removal rate is about 57%, figure 1 Middle (c).

Embodiment 3

[0050] Catalyst preparation, weigh 40g potassium permanganate and add to 1.2L water, then add 1kg of pretreated activated carbon, after 10h of reaction, the solution becomes colorless, manganese oxide particles appear in the solution, pour the supernatant liquid, add After washing with clean water twice, drying at room temperature, and drying at 80°C for 8 hours, an in-situ-generated manganese oxide activated carbon-supported electrocatalyst was prepared, and the weight ratio of manganese to the weight of activated carbon was 2.78%.

[0051] Other is with embodiment 1, and result COD is 390, and removal efficiency is about 65%, figure 1 Middle (d).

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Abstract

The invention relates to a technology for removing COD (chemical oxygen demand) from film separation strong brine by electro-catalytic treatment. The technology comprises preparing a carrier catalyst,preparing a three-dimensional electro-catalytic system, and carrying out electro-catalytic treatment on film concentrating high-salinity brine, the method specifically comprises the following steps:(1) adding activated carbon which is simply pretreated into a certain amount of high-valence soluble manganese salt solution, after reaction for a certain time, washing and drying to prepare a manganese oxide in-situ loaded activated carbon electrocatalyst filler; (2) vertically arranging an electrode plate at the bottom of an electric catalysis tank, connecting a wire from the low end of the electrode plate, and adding the electrocatalysis carrier catalyst to form the three-dimensional electrocatalysis system; and (3) allowing the film separation strong brine to enter from the upper part anddischarge from the lower part, and adjusting process parameters such as operation current, voltage, residence time and the like to treat the wastewater. The method has the advantages that high-temperature treatment is not needed, the stability of the carrier is kept to the maximum extent, and the carrier has relatively high specific surface and electrocatalytic activity, is simple to operate and low in cost, and is expected to be applied to large-scale application.

Description

technical field [0001] The present invention relates to the technology of electrocatalytic treatment membrane separation concentrated brine to remove COD, specifically, it relates to an in-situ electrocatalyst and its electrocatalytic membrane separation method for high-salt concentrated water, which belongs to the technical field of environmental protection and water treatment . Background technique [0002] With the increasing pressure of environmental protection, resource utilization and zero-emission technologies have become increasingly urgent, especially in the chemical industry, which consumes a lot of water, the composition of wastewater is complex, and the pollution factors are highly toxic. If the discharge cannot meet the standards, it will have a relatively long-lasting impact on the environment. Therefore, this kind of wastewater is not only the focus of environmental protection supervision, but also a technical problem that environmental protection enterprises ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/467B01J23/34
CPCY02W10/37
Inventor 李想吴雅琴杨波张高旗
Owner HANGZHOU WATER TREATMENT TECH DEV CENT
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