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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  • Abstract
  • Description
  • Claims
  • Application Information

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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

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

Examples

Experimental program
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Example Embodiment

[0042] Example 1

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

[0044] The electrode diameter is 50mm;

[0045] The electrode plate 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 is degraded by 66% after 1 hour of reaction; when the current density of the oxygen evolution electrode is 2.5mA / cm 2 When the reaction time is 1h, RhB is degraded by 92%; when the current density continues to ...

Example Embodiment

[0050] Example 2

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

[0052] The electrode diameter is 50mm;

[0053] The current between the iron electrode and the graphite electrode is set to 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 electrode plate distance between the oxygen evolution electrode and the iron electrode, the influence of the electrode plate distance on the wastewater degradation efficiency of the electro-Fenton system was investigated.

[0055] Such as image 3 As shown, when the electrode plate spacing between the oxygen evolution electrode and the iron electrode is 3 cm, after 1 h of reaction, the RhB degradation efficiency of the electro-Fenton system is 80%; when the electrode plate spacing between the oxygen evolution electrode and the iron...

Example Embodiment

[0057] Example 3:

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

[0059] The electrode diameter is 50mm;

[0060] The current between the iron electrode and the graphite electrode is set to 5mA / cm 2 , The current density of oxygen evolution anode and hydrogen evolution electrode is 5mA / cm 2 , The electrode plate 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 wastewater degradation in the electric Fenton system 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 decreases slightly; continue to i...

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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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