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Electrooxidation treatment technique for wastewater of chlorobenzene-containing compound

A treatment process and compound technology, applied in water/sewage treatment, water/sludge/sewage treatment, water pollutants, etc., can solve the problems of easy loss of granular particle electrodes, lack of catalytic effect of electrodes, lack of catalytic effect, etc. , to achieve significant market development prospects, low operating costs, and small equipment

Active Publication Date: 2007-09-19
ZHEJIANG UNIV OF TECH
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Limited by the heterogeneous reaction on the surface of the electrochemical electrode, active particle electrodes are filled between the cathode and anode electrodes to form a three-dimensional electrode, which can effectively increase the surface area of ​​the electrode and promote the reaction (Zhang Fang et al., Acta Chem. Sinica, 64(2006.3) 235~239) , but the designed graphite rod electrode lacks catalytic effect, and the filled granular particle electrode is easy to lose; Xie Maosong et al. proposed an electric-heterogeneous catalytic reaction process (ZL92106153.6) early, and used this technology to process beer Wastewater (ZL92106153.6), fertilizer plant wastewater (ZL00122912) and oilfield wastewater (ZL01138976.1), etc., the catalyst filled in essence acts as an active particle electrode, but the electrode described in the patent is titanium or graphite material, and the electrode catalytic effect is still Insufficient, an aeration system is installed at the bottom of the reaction tank to achieve the purpose of oxygenation and stirring

Method used

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  • Electrooxidation treatment technique for wastewater of chlorobenzene-containing compound
  • Electrooxidation treatment technique for wastewater of chlorobenzene-containing compound
  • Electrooxidation treatment technique for wastewater of chlorobenzene-containing compound

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0029] Example 1: Preparation of titanium-based composite metal lead oxide electrode modified by fluororesin

[0030] The fluororesin-modified titanium-based composite metal lead oxide electrode can be coated with Sn and Sb metal oxide films in the middle layer by thermal decomposition, with a content of 10 -5 mol / cm 3 order of magnitude; lead oxide active layer prepared by electrodeposition, α-PbO by alkali plating 2 , acid-plated β-PbO 2 , add fluorine resin emulsion when acid plating. Alkaline plating α-PbO 2 and acid plating β-PbO 2 For the process, refer to the literature ("Plating and Performance Research of Tubular Ceramic Lead Dioxide Anode", Ma Chun'an, etc., Fine Chemical Industry (Supplement), 1996; "Plating and Enhanced Life of Hydrophobic Lead Dioxide Electrode", Gan Yongping , Chemical World, 2002), the addition amount of fluororesin emulsion is 3.0mol / L.

Embodiment 2

[0031] Example 2: Mn-Sn-Sb / γ-Al 2 o 3 Preparation of Honeycomb Ceramic Active Catalytic Electrode

[0032] The Mn, Sn, and Sb active components of the regular active particle electrode can be prepared by impregnation, using soluble chloride or nitrate containing metal ions to impregnate γ-Al2 o 3 The carrier is left to stand for 3-4 hours, dried at 90° C. for 2-3 hours, and then calcined at 550° C. for 3-4 hours to obtain a finished electrode with regular active particles.

[0033] The γ-Al 2 o 3 The carrier is γ-Al 2 o 3 Honeycomb ceramic carrier, dimensions 47×47×47mm, number of holes 200-400 holes / inch 2 , wall thickness 0.15 ~ 0.3mm, opening area ratio ≥ 70%, specific surface area 60 ~ 100m 2 / g, the diameter of noble metal particles is 2-10nm, and the coating thickness is ≤3μm.

Embodiment 3

[0034] Embodiment 3: Wastewater treatment test containing chlorobenzene compounds

[0035] Wastewater containing chlorobenzene compounds:

[0036] (1) Wastewater containing chlorobenzene 200mg / L, pH neutral;

[0037] (2) Wastewater containing 200 mg / L of 1,2-dichlorobenzene, pH neutral;

[0038] (3) Wastewater containing 1,3-dichlorobenzene 200mg / L, pH neutral;

[0039] (4) Wastewater containing 1,4-dichlorobenzene 200mg / L, pH neutral;

[0040] (5) Wastewater containing 200 mg / L of 1,2,3-trichlorobenzene, with neutral pH.

[0041] Chlorobenzene compounds were determined by gas chromatography with an electron capture detector, the pH value was determined by a pH meter, and chloride ions were determined by a PXD-2 universal ion meter.

[0042] In an electrocatalytic reaction tank made of plexiglass, the composite catalytic electrode is set in the way of cathode and anode interlaced, the cathode has one anode, and the active honeycomb ceramic particle electrode is filled betw...

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Abstract

The present invention provides an electrochemical oxidation technique of waste water containing chlorobenzene compound, which is carried out in an electrocatalysis reaction tank, wherein a titanium-base bimetal lead oxide electrode modified by fluoro resin serves as the anode, a corrosion resistant plate serves as the cathode, an active beehive ceramic particle electrode is filled between the anode and the cathode, the waste water containing chlorobenzene compound serves as the electrolyte, a pulse direct current stabilized current power supply is adopted, thereby the chlorobenzene compound of the waste water is removed. The active beehive ceramic particle electrode is composed of Mn, Sn and Sb active component and a gamma-Al2O3 beehive ceramic carrier. The present invention has the advantages of compact equipment, excellent stability, low operating cost, easy operation and simple post treatment; besides, the present invention has a major market development prospect.

Description

(1) Technical field [0001] The invention relates to an electro-oxidation treatment process for wastewater containing chlorobenzene compounds. (2) Background technology [0002] Chlorobenzene pollutants include chlorobenzene, 1,2-dichlorobenzene, 1,3-dichlorobenzene, 1,4-dichlorobenzene and 1,2,4-trichlorobenzene, etc., which are the most concerned by countries all over the world. The organochlorine environmental pollutants have been included in the list of 129 priority pollutants by the U.S. Environmental Protection Agency, and included in the list of hazardous compounds by the European Union. Due to their wide use and stable chemical properties, most of these pollutants are difficult to degrade. They are common in the environment and have "three-effect" toxicity, which poses a great threat to the human body and the aquatic ecological environment. Practice has proved that chlorobenzene pollutants can easily penetrate the barriers of conventional water pollution control proj...

Claims

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Application Information

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IPC IPC(8): C02F1/461C02F1/58C02F101/36
Inventor 王家德陈建孟梅瑜刘臣亮
Owner ZHEJIANG UNIV OF TECH
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