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Electrocatalytic reduction-oxidation reactor and method for pre-treating chlorobenzene waste water using same

An oxidation reactor and electrocatalysis technology, applied in chemical instruments and methods, electrochemical water/sewage treatment, water/sludge/sewage treatment, etc., to avoid secondary pollution, realize industrial automation, and low operation and maintenance costs Effect

Active Publication Date: 2015-07-22
NANJING UNIV +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Combining electrocatalytic reduction and electrocatalytic oxidation to pretreat chlorobenzene wastewater has not been reported yet

Method used

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  • Electrocatalytic reduction-oxidation reactor and method for pre-treating chlorobenzene waste water using same

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Effect test

Embodiment 1

[0026] The electrocatalytic reduction-oxidation reactor that the present invention adopts is as shown in Figure 1, is made up of five closed containers, comprises cathode plate 1, anode plate 2, cation exchange membrane 3, cathode chamber 4, anode chamber 5, exhaust port 6. Cathode chamber water inlet 7, water inlet pipe 8, pump, anode chamber water outlet 9, cathode chamber water outlet 10, cathode chamber water outlet pipe 11, buffer tank 12, anode chamber water inlet pipe 13 and anode chamber water inlet 14; Each closed container includes a cathode chamber 4 and an anode chamber 5, and the cathode chamber 4 and the anode chamber 5 are separated by sequentially pasted cathode plate 1, anode plate 2 and cation exchange membrane 3, and the space near the cathode plate 1 is the cathode Chamber 4, the space near the anode plate 2 is the anode chamber 5; the exhaust port 6 is arranged at the top of the cathode chamber 4 and the anode chamber 5; the water inlet 7 of the cathode cha...

Embodiment 2

[0029] Adopted electrocatalytic reduction-oxidation reactor and embodiment are the same as example 1, and the waste water source is the same as example 1, and the difference is that the control current density is 15mA / cm 2, the residence time is 3h, the cathode plate 1 uses a titanium plate, and the anode plate 2 uses a titanium electrode coated with iridium oxide. The pH of the wastewater is adjusted to 2 before treatment. After treatment, the COD of chlorobenzene wastewater was less than 500mg / L, the concentration of chlorobenzene was less than 1.5mg / L, the relative inhibition rate of acute toxicity of luminescent bacteria was 6.2%, and the B / C of wastewater increased to 0.41. The treated tail water is discharged directly or further treated.

Embodiment 3

[0031] Adopted electrocatalytic reduction-oxidation reactor and embodiment are the same as example 1, and the waste water source is the same as example 1, and the difference is that the control current density is 20mA / cm 2 , the residence time is 2h, the cathode plate 1 uses a titanium plate loaded with ruthenium oxide, the anode plate 2 uses a titanium electrode coated with iridium oxide, and the pH of the wastewater is not adjusted before treatment. After treatment, the COD of chlorobenzene wastewater was less than 540mg / L, the concentration of chlorobenzene was less than 2.0mg / L, the relative inhibition rate of acute toxicity of luminescent bacteria was 7.1%, and the B / C of wastewater increased to 0.39. The treated tail water is discharged directly or further treated.

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Abstract

The invention discloses an electrocatalytic reduction-oxidation reactor and a method for pre-treating chlorobenzene waste water using the same. The chlorobenzene waste water is led into a cathode chamber of the electrocatalytic reduction-oxidation reactor; the whole reactor is filled with the chlorobenzene waste water; electrocatalytic treatment is carried out; the waste water is subjected to a reduction reaction in the cathode chamber; the waste water after treatment in the cathode chamber is led into an anode chamber through a reduction water discharging collection system; and the obtained waste water is subjected to an oxidation reaction. The electric current densities of an anode plate and a cathode plate are 5-25mA / cm2; the residence time of the waste water in both the cathode chamber and the anode chamber is 2-5h, and the distance between the cathode chamber and the anode chamber is 1mm. According to the invention, metal reduction is replaced by electrocatalytic reduction, so that problems that a metal is prone to be passivated and the mass-transfer efficiency is low are overcome; other advanced oxidation technology, such as Fenton oxidation is replaced by electrocatalytic oxidation, so that problems that the treatment efficiency is low and the added amount of chemical reagents is large are avoided; and the concentration of the chlorobenzene waste water is effectively decreased, toxicity of waste water is reduced, and biodegradability of the waste water is improved.

Description

technical field [0001] The invention relates to an electrocatalytic device and a wastewater pretreatment method, in particular to an electrocatalytic reduction-oxidation device and a method for pretreating chlorobenzene wastewater using the same. Background technique [0002] Chlorobenzene is an important organic intermediate, which is widely found in wastewater discharged from industries such as dyestuffs, pharmaceuticals, pesticides, leather, steel, and textile printing and dyeing. Higher concentrations of chlorobenzene are often detected in natural water bodies. Chlorobenzene has a strong smell, can irritate the respiratory tract, skin and mucous membrane tissue, can accumulate in the human body, damage the liver, kidney, immune system and nervous system, and has obvious "three-caused effects". Because chlorobenzene is highly toxic and difficult to biodegrade, the U.S. Environmental Protection Agency (US EPA) defines chlorobenzene as a persistent toxic compound, and many ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/46C02F101/36
Inventor 李爱民王柏俊宋海欧王长明姚志建孙亮李强
Owner NANJING UNIV
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