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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AI-Extracted 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-heteroge...

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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.

Application Domain

Water contaminantsWater/sewage treatment

Technology Topic

Corrosion resistantCeramic particle +15

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Examples

Experimental program(3)

Example Embodiment

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

[0030] The fluororesin-modified titanium-based composite metal lead oxide electrode can be thermally decomposed to coat the intermediate layer of Sn and Sb metal oxide film with a content of 10 -5 mol/cm 3 Order of magnitude; lead oxide active layer prepared by electrodeposition, alkaline plating α-PbO 2 , Acid plating β-PbO 2 , Add fluororesin emulsion during acid plating. Alkaline plating α-PbO 2 And acid plating β-PbO 2 Refer to literature ("Plating and Performance Research of Tubular Ceramic Lead Dioxide Anode", Ma Chunan et al., Fine Chemicals (Supplement), 1996; "Research on Plating and Enhanced Life of Hydrophobic Lead Dioxide Electrode", Gan Yongping , Chemical World, 2002), the addition amount of fluororesin emulsion is 3.0mol/L.

Example Embodiment

[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 structured active particle electrode can be prepared by an impregnation method, and γ-Al is impregnated with soluble chloride or nitrate containing metal ions2 O 3 The carrier is allowed to stand for 3 to 4 hours, dried at 90°C for 2 to 3 hours, and then fired at 550°C for 3 to 4 hours to prepare a finished product with regular active particle electrodes.

[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 , The wall thickness is 0.15~0.3mm, the open area rate is ≥70%, the specific surface area is 60~100m 2 /g, the precious metal particle diameter is 2-10nm, and the coating thickness is ≤3μm.

Example Embodiment

[0034] Example 3: Wastewater treatment test of chlorobenzene compounds

[0035] Wastewater containing chlorobenzene compounds:

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

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

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

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

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

[0041] Chlorobenzene compounds are measured by gas chromatography with electron capture detector, pH value is measured by pH meter, and chloride ion is measured by PXD-2 universal ion meter.

[0042] In an electrocatalytic reaction tank made of organic glass, composite catalytic electrodes are arranged in a cathode-anode staggered manner. The cathode has multiple anodes. The active honeycomb ceramic particle electrode is filled between the cathode and the anode to form a three-dimensional electrocatalytic reactor. The distance between the two plates is 50mm, the bottom of which enters water, and the top of which exits. The power supply adopts pulsed DC power supply, with a DC voltage of 8V and a current density of 10mA/cm 2 Under electric field conditions, the chlorobenzene wastewater treatment was carried out, and the results are as follows:

[0043] Table 1: Treatment results of chlorobenzene wastewater

[0044]

[0045] Table 2: Treatment results of dichlorobenzene wastewater

[0046]

[0047] 0.5h

[0048] Table 3: Trichlorobenzene wastewater treatment results

[0049]

[0050] In summary, the electrocatalytic oxidation process of the present invention can effectively treat chlorobenzene wastewater. The electrocatalytic reaction tank made of organic glass is used, and the composite catalytic electrode is arranged in a cathode and anode staggered manner. The cathode has multiple anodes. The active honeycomb ceramic particle electrode is filled between the cathode and the anode to form a three-dimensional electrocatalytic reactor with anode and cathode plates. The spacing is 50mm, with water in the bottom and water out at the top. The power supply adopts pulsed DC power supply, with a DC voltage of 8V and a current density of 10mA/cm 2 Under electric field conditions, the electrocatalytic oxidation process of the present invention has a removal rate of 44.8-92.4% for chlorobenzene pollutants with a concentration of less than 200 mg/L.

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PUM

Property	Measurement	Unit
Wall thickness	0.15 ~ 0.3	mm
Specific surface area	60.0 ~ 100.0	m²/g
Diameter	2.0 ~ 10.0	nm
tensile		MPa
Particle size		Pa
strength	10

Description & Claims & Application Information

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Classification and recommendation of technical efficacy words

Good stability
Equipment is small

Electrooxidation treatment technique for wastewater of chlorobenzene-containing compound

AI-Extracted Technical Summary

Problems solved by technology

Abstract

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Examples

Example Embodiment

Example Embodiment

Example Embodiment

PUM

Description & Claims & Application Information

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