Preparation method and application of sludge-based gas diffusion particle electrode
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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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[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 eff
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[0025] Example 1
[0026] See attached figure 1 , Prepare the sludge-based gas diffusion particle electrode according to the following steps:
[0027] 1. Mechanical dewatering of sludge
[0028] The mechanically dewatered sludge is dried to a moisture content of 5wt% at a temperature of 105°C, and the dried sludge is crushed by a grinder and sieved with 200 meshes to obtain sludge powder.
[0029] 2. Activation of sludge
[0030] The sludge powder is mixed with 2% sodium carboxymethyl cellulose as a binder and 15% polymethyl methacrylate as a pore former. After mixing and mixing, the sludge is added. A 5 mol / L zinc chloride solution with a mass of 30% was activated for 18 h.
[0031] 3. Formation of sludge raw material ring
[0032] Stir the activated sludge, knead it into a dough, weigh 6 g of sludge and place it in a silica gel mold, freeze at -20°C for 20 minutes, take out the formed sludge ring, and freeze-dry it after the outer diameter stabilizes at 2.0 cm 15h is the sludge raw me...
Example Embodiment
[0037] Example 2
[0038] See attached figure 2 , The carbonized sludge ring 5 prepared in Example 1 is a sludge-based gas diffusion particle electrode, which is arranged in a series on the plastic hose 8 to prepare an electrode string with a pitch of 2.5 cm.
[0039] See attached image 3 There are a number of vent holes 9 where the plastic hose 8 is connected to the carbonized sludge ring 5.
[0040] Refer to Figure 4 , The particle electrode with a total mass of 36.8 g is placed vertically in the three-dimensional electrochemical reactor, connected by branch pipes into two rows, one row of four strings, each string of four carbonized sludge rings 5 (particle electrode), the electrode string is filled in A catalyst is connected between the anode 2 and the cathode 3 of the DC stabilized power supply 1, and the rhodamine B dye wastewater 6 is subjected to electrocatalytic oxidation treatment. The anode 2 of the three-dimensional electrochemical reactor adopts a ruthenium-iridium...
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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...
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