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Device and method for activating molecular oxygen by electrocatalysis to treat persistent organic wastewater

An organic waste water, refractory technology, applied in the field of environmental technology and water treatment, can solve the problems of long treatment time of medium and high concentration organic waste water, limited concentration of strong oxidizing substances, lower reaction temperature and pressure, etc., to achieve compact equipment and easy control. , the effect of reducing requirements

Inactive Publication Date: 2012-04-04
ZHEJIANG GONGSHANG UNIVERSITY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

The main disadvantages of the current electrocatalytic oxidation method are: due to the limited concentration of strong oxidizing substances produced by the pure electrocatalytic process, the treatment time for medium and high concentration organic wastewater is long and the oxidation efficiency is low
However, wet oxidation has high requirements on equipment materials, which must be resistant to high temperature, high pressure, and corrosion, so the cost of equipment is high.
The wet electrocatalytic oxidation method combines wet oxidation and electrochemical oxidation methods, reduces the temperature and pressure of the reaction, and realizes the effective treatment of high-concentration refractory wastewater under mild conditions, but the wet electrocatalytic treatment device still needs to operate at 100-200°C To react, the energy consumption is relatively large, and the requirements for the material of the reactor are also high

Method used

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  • Device and method for activating molecular oxygen by electrocatalysis to treat persistent organic wastewater
  • Device and method for activating molecular oxygen by electrocatalysis to treat persistent organic wastewater
  • Device and method for activating molecular oxygen by electrocatalysis to treat persistent organic wastewater

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0022] Embodiment 1. Comparison of the removal effect of different organic matter

[0023] Reaction solution volume: 500ml

[0024] Reaction solution concentration: 1mM

[0025] Electrolyte concentration: 50mM Na 2 SO 4

[0026] Anode plate area: 48cm 2

[0027] Cathode plate area: 48cm 2

[0028] Oxygen pressure: 0.5MPa

[0029] Response time: 90min

[0030] Response current: 0.100A

[0031] The anode material is titanium-based lead dioxide, and the cathode material is activated carbon fiber felt modified by iron metal porphyrin. The specific surface area of ​​the activated carbon fiber felt is 1200m 2 / g.

[0032] Add organic waste water directly into the electrolysis reactor. The distance between the cathode and anode in the reactor is fixed. After adding the waste water, close the reaction box, feed oxygen, adjust the oxygen pressure, and pre-pressurize for 15 minutes to make the oxygen dissolve and reach saturation. Turn on the magnetic stirrer and the regulat...

Embodiment 2

[0037] Embodiment 2. For the comparison of different cathode materials

[0038] Reaction solution volume: 500ml

[0039] Reaction solution concentration: 8mM p-chlorophenol

[0040] Electrolyte concentration: 50mM Na 2 SO 4

[0041] Anode plate area: 48cm2

[0042] Cathode plate area: 48cm 2

[0043] Oxygen pressure: 0.5MPa

[0044] Response time: 90min

[0045] Response current: 0.100A

[0046] The anode material is titanium-based lead dioxide, and the cathode materials are activated carbon fiber felt modified by iron metal porphyrin and titanium-chromium-nickel alloy mesh.

[0047] Add high-concentration organic wastewater directly into the electrolysis reactor. The distance between the cathode and anode in the reactor is fixed. After adding wastewater, close the reaction box, feed oxygen, adjust the oxygen pressure, and pre-pressurize for 15 minutes to make the oxygen dissolve and reach saturation. Turn on the magnetic stirrer and the regulated DC power supply, ad...

Embodiment 3

[0052] Example 3. Comparison for different anode materials

[0053] Reaction solution volume: 500ml

[0054] Reaction solution concentration: 8mM p-chlorophenol

[0055] Electrolyte concentration: 50mM Na 2 SO 4

[0056] Anode plate area: 48cm 2

[0057] Cathode plate area: 48cm 2

[0058] Oxygen pressure: 0.5MPa

[0059] Response time: 90min

[0060] Response current: 0.100A

[0061] The anode materials are titanium-based lead dioxide and titanium-based ruthenium dioxide, and the cathode material is activated carbon fiber felt modified by iron metal porphyrin.

[0062] Add high-concentration organic wastewater directly into the electrolysis reactor. The distance between the cathode and anode in the reactor is fixed. After adding wastewater, close the reaction box, feed oxygen, adjust the oxygen pressure, and pre-pressurize for 15 minutes to make the oxygen dissolve and reach saturation. Turn on the magnetic stirrer and the regulated DC power supply, adjust the curr...

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Abstract

The invention provides a device for activating molecular oxygen by electrocatalysis to treat persistent organic wastewater, which comprises a reaction chamber, an electrolysis reactor and a magnetic stirrer, wherein a cathode and an anode are arranged in the electrolysis reactor, and the electrolysis reactor with magneton is arranged in the reaction chamber; the reaction chamber is provided with a sampling port, and the reaction chamber is externally connected with an oxygen supply device. The invention also provides a method for treating the persistent organic wastewater through electrocatalysis by using the device. The method comprises the following steps of: directly adding organic wastewater into the electrolysis reactor, wherein the pressure in the electrocatalysis reactor is 0.1-3 MPa, and the temperature is room temperature; introducing oxygen gas or air, and producing strongly oxidizing free radicals under the action of electrocatalysis to eliminate persistent organic matter in the wastewater. The invention has the characteristics of complete oxidation, high speed, high efficiency, no secondary pollution, simple device and easy operation; moreover, the treatment cost is greatly reduced by activating a large amount of oxygen gas existing in the air as strongly oxidizing matter.

Description

technical field [0001] The invention relates to a novel water treatment method and device for degrading high-concentration organic wastewater by using electrocatalysis to activate molecular oxygen, and belongs to the fields of environmental technology and water treatment technology. Background technique [0002] In recent years, with the rapid development of petrochemical, printing and dyeing, pharmaceutical, fine chemical and other industries, a large amount of highly toxic and refractory organic wastewater has been produced, which has brought difficulties to sewage treatment and caused great pressure on the environment. The Advanced Oxidation Process (AOPs) developed in the 1980s is characterized by the generation of hydroxyl radicals (OH) with strong oxidizing ability, which can quickly and completely degrade organic pollutants, and the process is flexible. Gaining importance. Electrochemical advanced oxidation process is a new type of advanced oxidation process, which h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/72C02F1/461
Inventor 丛燕青孙培德张轶王齐
Owner ZHEJIANG GONGSHANG UNIVERSITY
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