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Dye wastewater treatment method by coupling ozone oxidation with electrocatalytic reduction

A technology of dye wastewater and ozone oxidation, which is applied in the direction of oxidized water/sewage treatment, energy wastewater treatment, water/sewage treatment, etc., can solve the problems of AOX by-products, AOX concentration rise, etc., and achieve stable water quality and mild reaction conditions , The effect of simple process

Active Publication Date: 2022-05-27
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, although the advanced oxidation process can broadly remove conventional pollutants in wastewater, when treating refractory wastewater containing high concentrations of halogen ions (≥500 mg / L), the halogen ions in the wastewater will interact with the advanced oxidation process. The generated active free radicals react, transform into halogen free radicals, and then react with organic matter to form organic halogenated by-products, resulting in an increase in the concentration of AOX in wastewater. However, it is difficult to effectively control the newly formed AOX by-products in the oxidation process by the advanced oxidation process. and remove

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  • Dye wastewater treatment method by coupling ozone oxidation with electrocatalytic reduction
  • Dye wastewater treatment method by coupling ozone oxidation with electrocatalytic reduction
  • Dye wastewater treatment method by coupling ozone oxidation with electrocatalytic reduction

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Embodiment 1

[0049] Ozone oxidation coupled electrocatalytic reduction dye wastewater treatment method, comprising the following steps:

[0050] From a dye wastewater treatment plant in a chemical park, take 500 mL has passed A 2 Dye wastewater treated by the / O process, that is, primary treatment wastewater, the COD concentration in the primary treatment wastewater is 594 mg / L, the TOC concentration is 162 mg / L, and the AOX content is 8.1 mg / L, Cl - 、Br - Concentrations were 3380 mg / L and 165 mg / L, respectively, and the pH was 8.6.

[0051] At room temperature, add 0.5 g / L MnO to the primary treatment wastewater x / GAC catalyst, and then through the 100 mesh sieve hole of the quartz aeration head to the primary treatment of wastewater into the ozone, ozone concentration of 40 mg / L, ozone flow of 0.5 L / min, treatment time of 1.5 h, to obtain secondary treatment of wastewater; with concentrated sulfuric acid to adjust the pH of secondary treatment of wastewater to 3.0; and then electrocatal...

Embodiment 2

[0053] Ozone oxidation coupled electrocatalytic reduction dye wastewater treatment method, comprising the following steps:

[0054] From a dye wastewater treatment plant in a chemical park, take 500 mL has passed A 2Dye wastewater treated by the / O process, that is, primary treatment wastewater, the COD concentration in the primary treatment wastewater is 594 mg / L, the TOC concentration is 162 mg / L, and the AOX content is 8.1 mg / L, Cl - 、Br - Concentrations were 3380 mg / L and 165 mg / L, respectively, and the pH was 8.6.

[0055] At room temperature, add 1.0 g / L MnO to the primary treatment wastewater x / GAC catalyst, and then through the 100 mesh sieve hole of the quartz aeration head to the primary treatment of wastewater into the ozone, ozone concentration of 40 mg / L, ozone flow of 0.5 L / min, treatment time of 1.5 h, to obtain secondary treatment of wastewater; with concentrated sulfuric acid to adjust the pH of secondary treatment of wastewater to 3.0; and then electrocataly...

Embodiment 3

[0057] Ozone oxidation coupled electrocatalytic reduction dye wastewater treatment method, comprising the following steps:

[0058] From a dye wastewater treatment plant in a chemical park, take 500 mL has passed A 2 Dye wastewater treated by the / O process, that is, primary treatment wastewater, the COD concentration in the primary treatment wastewater is 594 mg / L, the TOC concentration is 162 mg / L, and the AOX content is 8.1 mg / L, Cl - 、Br - Concentrations were 3380 mg / L and 165 mg / L, respectively, and the pH was 8.6.

[0059] At room temperature, 1.5 g / L MnO is added to the primary treatment wastewater x / GAC catalyst, and then through the 100 mesh sieve hole of the quartz aeration head to the primary treatment of wastewater into the ozone, ozone concentration of 40 mg / L, ozone flow of 0.5 L / min, treatment time of 1.5 h, to obtain secondary treatment of wastewater; with concentrated sulfuric acid to adjust the pH of secondary treatment of wastewater to 3.0; and then electro...

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Abstract

The invention discloses a dye wastewater treatment method by coupling ozonation with electrocatalytic reduction, and belongs to the field of dye wastewater treatment.The method comprises the following steps that dye wastewater is subjected to A2 / O process treatment, and primary treatment wastewater is obtained; adding a catalyst MnOx / GAC into the primary treated wastewater, introducing ozone, and carrying out ozone catalytic oxidation treatment to obtain secondary treated wastewater; carrying out electrocatalytic reduction treatment on the secondary treatment wastewater; a working electrode for electrocatalytic reduction treatment is a Pd / gamma-MnO2 / Ni foam composite electrode, the electrode is prepared by taking foamed nickel as a matrix, forming a gamma-MnO2 intermediate layer on the surface of the foamed nickel through a hydrothermal reaction and then chemically depositing Pd nanoparticles. According to the invention, the ozone catalytic oxidation treatment and the electrocatalytic reduction technology are coupled, so that the synergistic removal of conventional pollutants and organic halides in the dye wastewater can be realized, the effluent quality is ensured to be stable and reach the standard, and the method has a wide application prospect.

Description

Technical field [0001] The present invention belongs to the field of dye wastewater treatment, in particular, the present invention relates to an ozone oxidation coupled electrocatalytic reduction dye wastewater treatment method. Background [0002] Dye production wastewater in the high concentration of organic pollutants, large molecular weight, high salt content, large color, simple biological treatment process on the wastewater COD and color removal effect is generally not good, often require advanced oxidation process for further treatment. The advanced oxidation process mainly uses the hydroxyl radicals, ozone and other strong oxidants generated in the system to oxidize or mineralize organic pollutants into harmless substances, which has the advantages of fast reaction speed and thorough degradation of pollutants, and is more and more widely used in the deep treatment process of refractory wastewater. [0003] Due to the use of a large number of halogenated phenol, haloanili...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/461C02F1/78C02F101/30C02F101/36
CPCC02F1/725C02F1/78C02F1/4676C02F1/46109C02F2001/46133C02F2101/308C02F2101/36Y02W10/37
Inventor 陈吕军徐冉云迟彤彤李菲菲田金平
Owner TSINGHUA UNIV
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