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Preparation method and application of sludge-based gas diffusion particle electrode

A particle electrode and gas diffusion technology, applied in chemical instruments and methods, water/sludge/sewage treatment, water pollutants, etc., to achieve stable effects, alleviate deactivation, and long-lasting effects

Inactive Publication Date: 2020-05-01
EAST CHINA NORMAL UNIVERSITY
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] The object of the present invention is a sludge-based gas diffusion particle electrode preparation method and its application designed for the deficiencies of the prior art. Activated carbon prepared by sludge pyrolysis is used to make a gas diffusion particle electrode, which is arranged in series The method is applied to the three-dimensional electrochemical water treatment process, integrating aeration and electrocatalysis functions to achieve efficient and durable sewage treatment effects, reduce the short-circuit current and bypass current inside the reactor, and reduce the power consumption of the system, sludge-based gas Diffusion particle electrodes provide a new solution to the clogging and deactivation problem of particle electrodes in three-dimensional electrochemical reactors, and help to promote the application of three-dimensional electrochemical technology in the field of sewage treatment

Method used

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  • Preparation method and application of sludge-based gas diffusion particle electrode
  • Preparation method and application of sludge-based gas diffusion particle electrode
  • Preparation method and application of sludge-based gas diffusion particle electrode

Examples

Experimental program
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Effect test

Embodiment 1

[0026] See attached figure 1 , according to the following steps to prepare the sludge-based gas diffusion particle electrode:

[0027] 1. Mechanical dewatering of sludge

[0028] The mechanically dehydrated sludge was dried at a temperature of 105° C. to a moisture content of 5 wt%, and the dried sludge was pulverized by a pulverizer and sieved with 200 meshes to obtain sludge powder.

[0029] 2. Activation of sludge

[0030] Add 2% sodium carboxymethyl cellulose as binder and 15% polymethyl methacrylate as pore-forming agent to the sludge powder, stir and add sludge 30% by mass of 5 mol / L zinc chloride solution, activated for 18 h.

[0031] 3. Forming of raw sludge ring

[0032] Stir the activated sludge, knead it into a ball, weigh 6 g of sludge and place it in a silica gel mold, freeze at -20°C for 20 minutes, take out the molded sludge ring, and freeze-dry it after the outer diameter is stabilized to 2.0 cm 15h is the sludge raw material ring.

[0033] 4. Pyrolytic c...

Embodiment 2

[0038] See attached figure 2 , the carbonized sludge ring 5 prepared in Example 1 was used as sludge-based gas diffusion particle electrodes, and arranged in series on the plastic hose 8 to prepare electrode series with a spacing of 2.5 cm.

[0039] See attached image 3 , the place where the plastic hose 8 is connected to the carbonized sludge ring 5 is provided with several air outlet holes 9 .

[0040] refer to Figure 4 , the particle electrodes with a total mass of 36.8 g were vertically placed in a three-dimensional electrochemical reactor, connected by branch pipes to form two rows, one row of four strings, and each string had four carbonized sludge rings 5 ​​(particle electrodes), and the electrode strings were filled in A catalyst is used between the anode 2 and the cathode 3 connected to the DC stabilized voltage power supply 1 to perform electrocatalytic oxidation treatment on the rhodamine B dye wastewater 6 . The anode 2 of the three-dimensional electrochemica...

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Abstract

The invention discloses a preparation method and application of a sludge-based gas diffusion particle electrode. The method is characterized in that the method comprises the steps of: utilizing residual sludge of sewage treatment; doping an adhesive, a pore-forming agent and an activating agent; pyrolyzing and carbonizing the stirred sludge; and preparing a particle electrode subjected to electrocatalytic oxidation treatment, and arranging the particle electrode on plastic pipes in a stringed arrangement manner to prepare sludge-based gas diffusion particle electrode strings with the distanceof 2-3cm which is filled between a positive electrode plate and a negative electrode plate in a three-dimensional electrochemical reactor to serve as a catalyst, wherein aeration and electrocatalysisare integrated for electrocatalytic oxidation treatment of high-concentration organic wastewater and achieve the efficient and lasting sewage treatment effect. Compared with the prior art, the preparation method and application have the advantages of the high catalytic performance, effective alleviation of the inactivation of the particle electrode, the more stable effect and the longer service life, greatly enhance the gas-liquid-solid three-phase mass transfer effect in the particle electrode, further reduce the consumption of electric energy by the system, and implement an efficient and durable sewage treatment effect.

Description

technical field [0001] The invention relates to the technical field of electrochemical catalysts and applications, in particular to a method for preparing a sludge-based gas diffusion particle electrode and its application in three-dimensional electrochemistry. Background technique [0002] Three-dimensional electrochemical technology has the advantages of high degradation efficiency and low power consumption, and is very suitable for treating high-concentration refractory organic wastewater. The particle electrode filled between the negative and positive main plates is the core unit of the three-dimensional electrochemical reactor, and its performance directly determines the treatment effect of the three-dimensional electrochemical reactor on wastewater. Granular activated carbon is the most commonly used particle electrode at present, but with the extension of the reactor operating time, the catalytic degradation ability of the particle electrode to pollutants decreases si...

Claims

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Application Information

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IPC IPC(8): C02F1/467C02F1/72C02F101/38
CPCC02F1/4672C02F1/725C02F2101/308C02F2101/38
Inventor 徐娟陈晨
Owner EAST CHINA NORMAL UNIVERSITY
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