An electrochemical oxidation-assisted Fenton oxidation method for the treatment of aldehyde chemical industry wastewater

A technology for chemical wastewater and Fenton oxidation, applied in chemical instruments and methods, special compound water treatment, water/sewage treatment, etc., to reduce the dosage, improve the utilization rate of iron ions, and improve the efficiency of Fenton oxidation.

Active Publication Date: 2022-02-01
NANJING UNIV OF SCI & TECH
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Problems solved by technology

[0006] Aiming at the problem in the prior art that Fenton oxidation is limited by the pH of sewage to be treated, the present invention provides an electrochemical oxidation-assisted Fenton oxidation method for the treatment of aldehyde chemical wastewater. In chemical wastewater containing aldehyde, the conditions Control enables Fenton oxidation to proceed under a wide range of pH conditions and maintain high Fenton oxidation reactivity

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  • An electrochemical oxidation-assisted Fenton oxidation method for the treatment of aldehyde chemical industry wastewater
  • An electrochemical oxidation-assisted Fenton oxidation method for the treatment of aldehyde chemical industry wastewater
  • An electrochemical oxidation-assisted Fenton oxidation method for the treatment of aldehyde chemical industry wastewater

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Embodiment 1

[0052] In this embodiment, the wastewater to be treated is self-prepared simulated wastewater, and a 500 mg / L glyoxal solution is prepared, and 500 mL is taken as the treated wastewater, and 50 mg / L pyrazole and 0.05 mol of anhydrous sodium sulfate are added. Among them, pyrazole is a refractory target pollutant.

[0053] This embodiment adopts the coupled process of "electrochemical oxidation + Fenton oxidation". Prepare five copies of the same simulated wastewater above, adjust the pH of the wastewater to 6.5, and perform electrochemical assisted oxidation for 0.5, 1, 2, 3, and 4 hours respectively. The electrode material in the electrochemical assisted oxidation unit is a plate electrode, and the anode material is It is a ruthenium dioxide-coated plate electrode, and the cathode material is a stainless steel plate electrode. At this stage, the control current density is 3.5~6.5mA / cm 2 , Constant current treatment of wastewater, turn off the power. Then, the tail water af...

Embodiment 2

[0058] The wastewater treatment of this embodiment continues to use simulated wastewater, prepare five parts of 500mL 50mg / L pyrazole solutions, add different amounts of oxalic acid (see its dosage and Fe 2+ ratio), stir to dissolve, add FeSO 4 ·7H 2 O, add H after about 5 minutes until the ferrous ions are completely dissolved and complexed 2 o 2 , so that simulated wastewater COD and H 2 o 2 The mass ratio is 1:0.8, iron (II) and H 2 o 2 The molar ratio is about 1:10. Fe in wastewater a 2+ with C 2 h 2 o 4 The molar ratio is about 1:0.25 (Fe 2+ The molar ratio to carboxyl group is about 1:0.5), Fe in wastewater b 2+ with C 2 h 2 o 4 The molar ratio is about 1:0.5 (Fe 2+ The molar ratio to the carboxyl group is about 1:1), Fe in the wastewater c 2+ with C 2 h 2 o 4 The molar ratio is about 1:1 (Fe 2+ The molar ratio to carboxyl group is about 1:2), Fe in wastewater d 2+ with C 2 h 2 o 4 The molar ratio is about 1:1.5 (Fe 2+ The molar ratio to carboxy...

Embodiment 3

[0063] In this example, the quality of the industrial tail water to be treated is the tail water discharged during the production process of a chemical fiber enterprise, the COD content is 6000-8000 mg / L, and the COD contributed by aldehyde organic molecules is 55%-60%, and the pH value of the wastewater is 9-10, the main pollutants are acetaldehyde, triethylene glycol, PTA, EG and other pollutants, and also include pyrrole, indole, pyrazole, and other refractory nitrogen-containing heterocyclic compounds.

[0064] This embodiment adopts the coupled process of "electrochemical oxidation + Fenton oxidation".

[0065] In this embodiment, the electrode material in the electrochemical assisted oxidation unit is a plate electrode, the anode material is a ruthenium dioxide coated plate electrode, and the cathode material is a stainless steel plate electrode. At this stage, the control current density is 3.5~6.5mA / cm 2 , The wastewater is treated with a constant flow, the pH value o...

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Abstract

The invention discloses an electrochemical oxidation-assisted Fenton oxidation method for the treatment of aldehyde chemical industry wastewater, which comprises the following steps: S1 is aimed at aldehyde chemical industry wastewater, first using electrochemical oxidation to produce complexing agent; S2 in step S1 After adding ferrous ion to the system, the complexing agent is complexed with ferrous ion to form a ferrous ion complex; S3 adds hydrogen peroxide to the system after step S2, so that the ferrous ion complex and peroxide Hydrogen is degraded by Fenton oxidation. Utilize the small molecular organic acids with complexing ability generated in situ by degrading aldehyde pollutants in the electrochemical oxidation treatment. Such small molecular organic acids are difficult to continue to degrade but can be complexed with ferrous ions in situ to form ferrous ion complexes. By using it to participate in the subsequent Fenton oxidation reaction, the Fenton reaction can be carried out not only under acidic conditions, but also under neutral / alkaline conditions.

Description

technical field [0001] The invention belongs to the field of sewage treatment technology, and more specifically relates to an electrochemical oxidation-assisted Fenton oxidation method for the treatment of aldehyde chemical industry wastewater. Background technique [0002] In the past few decades, with the development of industry, industrial wastewater has become one of the major types of water pollution in our country. The widespread pollution of various inorganic and organic substances has caused serious problems worldwide, from petrochemicals, paints, pesticides, Production wastewater from industries such as coal conversion contains high concentrations of pollutants such as nitrogen-containing and oxygen-containing heterocyclic compounds. NHCs and OHCs are harmful and refractory toxic and harmful substances, and it is difficult to treat them. The wastewater treatment process produced by the production of NHCs and OHCs fine chemicals generally adopts pretreatment processe...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F101/34
CPCC02F1/4672C02F1/722C02F2101/34C02F2305/026C02F2305/023
Inventor 韩卫清朱全琪李维魏卡佳沈锦优孙秀云刘晓东李健生
Owner NANJING UNIV OF SCI & TECH
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