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Novel local acidic electro-Fenton water treatment device and method

An acidic and partial technology, applied in water/sewage treatment, water treatment parameter control, chemical instruments and methods, etc., can solve the problems of increasing wastewater treatment costs, increasing water treatment costs, etc., to reduce sludge production and facilitate comprehensive treatment Process, cost reduction effect

Inactive Publication Date: 2019-04-16
TSINGHUA UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Although the electro-fenton method has many advantages, it still needs to operate under acidic conditions (optimum pH=2.8-3.5), and the initial pH of most wastewater is neutral or weakly alkaline. Therefore, in the electro-fenton method During the treatment process, it is necessary to add a large amount of acid to the wastewater to adjust the pH of the system. After the treatment, it is also necessary to add alkali to adjust the effluent to neutral again. This process greatly increases the cost of wastewater treatment.
In addition, the cathodic reduction of the electro-Fenton process produces H 2 o 2 Requires aeration for oxygen, which also increases the cost of water treatment

Method used

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  • Novel local acidic electro-Fenton water treatment device and method
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  • Novel local acidic electro-Fenton water treatment device and method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0043] The simulated wastewater is 1L of 10mg / L rhodamine B (RhB) solution, using figure 1 The processing device; wherein:

[0044] Electrode diameter is 50mm;

[0045] The distance between the oxygen evolution electrode and the iron electrode is 2cm, and the current between the iron electrode and the graphite electrode is set to 5mA / cm 2;

[0046] Add 1mL H 2 o 2 solution, 20mM anhydrous sodium sulfate as electrolyte.

[0047] By changing the current density between the oxygen evolution electrode and the hydrogen evolution electrode, the influence of the current density on the degradation efficiency of the electro-Fenton system was investigated.

[0048] Such as figure 2 As shown, when the oxygen evolution electrode does not pass current, RhB degrades 66% after 1 hour of reaction; when the current density of the oxygen evolution electrode is 2.5mA / cm 2 , RhB was degraded by 92% after 1h of reaction; when the current density continued to increase to 5mA / cm 2 and 10mA / ...

Embodiment 2

[0051] The simulated wastewater is 1L of 10mg / L rhodamine B (RhB) solution, using figure 1 the device. in:

[0052] Electrode diameter is 50mm;

[0053] The current between the iron electrode and the graphite electrode was set at 5mA / cm 2 , the current density at the oxygen evolution anode and hydrogen evolution electrode is 5mA / cm 2 , add 1mL H 2 o 2 solution, 20mM anhydrous sodium sulfate as electrolyte.

[0054] By adjusting the plate distance between the oxygen evolution electrode and the iron electrode, the effect of the plate distance on the degradation efficiency of the electro-Fenton system was investigated.

[0055] Such as image 3 As shown, when the distance between the oxygen evolution electrode and the iron electrode is 3 cm, after 1 hour of reaction, the degradation efficiency of the electro-Fenton system to RhB is 80%; when the distance between the oxygen evolution electrode and the iron electrode is When it was reduced to 2cm, RhB was almost completely ...

Embodiment 3

[0058] The simulated wastewater is 1L of 10mg / L rhodamine B (RhB) solution, using figure 1 the device. in:

[0059] Electrode diameter is 50mm;

[0060] The current between the iron electrode and the graphite electrode was set at 5mA / cm 2 , the current density of the oxygen evolution anode electrode and the hydrogen evolution electrode is 5mA / cm 2 , The distance between the oxygen evolution electrode and the iron electrode is 2cm, and 20mM anhydrous sodium sulfate is used as the electrolyte.

[0061] By adding different concentrations of hydrogen peroxide, the influence of the concentration of hydrogen peroxide on the efficiency of electro-Fenton system to degrade wastewater was investigated.

[0062] Such as Figure 4 As shown, when the dosage of hydrogen peroxide is 0.5mL / L, the degradation efficiency of RhB is the fastest; when the dosage of hydrogen peroxide is increased to 1mL / L, the degradation efficiency of RhB is slightly decreased; continue to increase the dosage...

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Abstract

The invention relates to a novel local acidic electro-Fenton water treatment device and method. The device comprises an electro-Fenton reaction tank and a sedimentation tank connected with an outlet of the electro-Fenton reaction tank, wherein an oxygen evolution electrode, an iron electrode, a graphite electrode and a hydrogen evolution electrode are arranged in the electro-Fenton reaction tank from bottom to top. Accordingly, the oxygen evolution electrode is utilized for producing oxygen and protons to meet the acidic condition needed by electro-Fenton, a traditional electro-Fenton acidizing process is replaced. Compared with a traditional electro-Fenton technology, the method and device have the advantages that conventional acid and alkali adding and aeration process steps are omittedwhile organic pollutants are eliminated, the sludge output is reduced, and the water treatment cost is lowered, the treatment effect is flexible and controllable, and the treatment process is friendlyto environment, simpleness and effectiveness are achieve, combination with other treatment methods is easy, and the comprehensive management process is facilitated.

Description

technical field [0001] The invention belongs to the field of water treatment, and in particular relates to a local acidic electric Fenton water treatment device and method. Background technique [0002] Electro-Fenton technology (EF) is a new type of electrochemical advanced oxidation technology based on Fenton chemical reaction. The required reagents are used to generate hydroxyl radicals (·OH) with strong oxidizing properties, and the non-selective and strong oxidizing properties of ·OH are used to achieve the purpose of removing refractory organic pollutants. [0003] Compared with the traditional chemical Fenton method, the electro-Fenton method has many unique advantages: First, the electro-Fenton method can realize the in-situ production of H 2 o 2 and Fe 2+ , thereby effectively reducing the dosage of chemical reagents and reducing the processing cost; secondly, Fe 3+ can be effectively reduced to Fe 2+ , again with H 2 o 2 reaction, can reduce sludge productio...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F101/30
CPCC02F1/4672C02F1/52C02F1/722C02F2001/46133C02F2101/30C02F2201/4614C02F2209/08C02F2301/046C02F2303/06C02F2305/026
Inventor 王斌陈常斌吴俊学崔跃宗黄冬梅余刚
Owner TSINGHUA UNIV
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