Method for degrading nitrobenzene waste water by polyphase electrocatalytic oxidation-Fenton coupling process and reactor thereof

A catalytic oxidation, nitrobenzene technology, applied in chemical instruments and methods, oxidized water/sewage treatment, water/sewage multi-stage treatment, etc. problems, to achieve the effect of ensuring compliance with emission standards

Active Publication Date: 2010-09-22
广东华凯明信科技有限公司
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  • Application Information

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Problems solved by technology

However, studies have shown that if any oxidation method is used alone to treat nitrobenzene wastewater, the

Method used

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  • Method for degrading nitrobenzene waste water by polyphase electrocatalytic oxidation-Fenton coupling process and reactor thereof
  • Method for degrading nitrobenzene waste water by polyphase electrocatalytic oxidation-Fenton coupling process and reactor thereof
  • Method for degrading nitrobenzene waste water by polyphase electrocatalytic oxidation-Fenton coupling process and reactor thereof

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Example Embodiment

[0037] Implementation example 1

[0038] In terms of weight percentages, 98% of the electrode particles accounted for activated carbon and iron filings as the matrix, with 0.01% platinum oxide, 0.02% palladium oxide, 0.1% nickel oxide, 0.2% cobalt oxide, 0.3% Zinc oxides, 0.37% copper oxides and 1% manganese dioxide are solid catalysts, and activated carbon or / and iron filings and solid catalysts are fully mixed into particles with a particle size of 4-6mm. Electrodes are used as electrodes; cathode electrode plates Use graphite, anode electrode plate uses RuO 2 -IrO 2 -TiO 2 / Ti, as the feed electrode, the initial pH of nitrobenzene wastewater is 3, the distance between the plates is 6cm, the cell voltage is 30V, Fe 2+ The dosage is 1.0g / L (add 6 times), and the aeration amount is 0.8m 3 Under the condition of COD 18000mg / L and nitrobenzene content of 1300mg / L nitrobenzene wastewater treated for 90 minutes, the removal rates of COD and nitrobenzene were 93.1% and 96.5%, respectiv...

Example Embodiment

[0040] Implementation example 2

[0041] In terms of weight percentages, activated carbon and iron filings accounting for 94% of the electrode particles are used as the matrix, 0.01% platinum oxide, 0.02% palladium oxide, 0.2% nickel oxide, 0.3% cobalt oxide, 0.47% Zinc oxide, 1% copper oxide and 4% manganese dioxide are solid catalysts, and the active carbon or / and iron filings and solid catalyst are fully mixed to form particles with a particle size of 4-6mm. The electrode is the working electrode; cathode electrode The plate is made of graphite, and the anode electrode plate is made of RuO 2 -IrO 2 -TiO 2 / Ti, as the feed electrode, the initial pH of nitrobenzene wastewater is 2, the electrode plate spacing is 4cm, the cell voltage is 20V, Fe 2+ The dosage is 0.8g / L (addition in 4 times), and the aeration amount is 0.6m 3 The rosin production wastewater with a COD of 3440mg / L was treated for 90 minutes under the condition of / h, and the removal rate of COD was 82.5%.

Example Embodiment

[0042] Implementation example 3

[0043] In terms of weight percentage, the iron filings accounting for 96% of the electrode particles are used as the matrix, with 0.01% platinum oxide, 0.02% palladium oxide, 0.2% nickel oxide, 0.3% cobalt oxide, and 0.47% zinc oxide. Oxide, 1% copper oxide and 2% manganese dioxide are solid catalysts, and the active carbon or / and iron filings and solid catalyst are fully mixed to form a particle electrode with a particle size of 4-6mm as the working electrode; activated carbon or / Fully mix iron filings and solid catalyst into particles with a particle size of 4-6mm. The electrode is the working electrode; the cathode electrode plate is graphite, and the anode electrode plate is RuO. 2 -IrO 2 -TiO 2 / Ti, as the feed electrode, as the feed electrode, the initial pH is 4, the distance between the plates is 8cm, the cell voltage is 40V, Fe 2+ Dosing amount is 1.2g / L (addition in 5 times), aeration amount is 1.0m 3 Under the condition of COD 273000mg...

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Abstract

The invention belongs to the technical field of treatment of high concentration organic waste water, and particularly relates to a method for degrading nitrobenzene waste water by a polyphase electrocatalytic oxidation process. The invention solves the problems of high cost and long time consumption in the traditional nitrobenzene waste water methods, low efficiency and high energy consumption in the electrolytic process, high oxidant consumption, high cost and the like in the Fenton process in the prior art for treating high concentration nitrobenzene water waste. The invention mainly adopts the catalytic oxidation action of transition metal catalysts in the electric field, and combines the Fenton process, thereby effectively degrading the high concentration nitrobenzene waste water. The method comprises the following steps that: (1) heterocatalytic reagents (solid catalysts) and particle electrodes, mainly including active carbon, and transition metal oxides and salts, are used for avoiding economic loss and secondary pollution to the environment, which are caused by catalyst loss in heterocatalytic oxidation; (2) under the condition of low pH value of the waste water in cooperation with Fe2+ with strong reducibility, a coupling reactor composed of an electrolysis field and oxidation reaction is used for generating chain reaction for generating an OH hydroxyl free radical, and the OH hydroxyl free radical can carrying out nonselective oxidization on organic substances, thereby finally oxidizing organic pollutants into carbon dioxide and water; (3) by using electric energy as an excitation energy and using cheap air as raw material, nitrobenzene substances in waste water are efficiently degraded under the coupling action of the polyphase electrocatalytic oxidation process and the Fenton process; (4) and the reactor is composed of a direct current regulated power supply, a feed electrode and an electrolytic bath.

Description

Technical field: [0001] The invention belongs to the technical field of nitrobenzene wastewater treatment, and specifically relates to a process method for advanced oxidation degradation of nitrobenzene wastewater, which adopts the synergistic effect of multiphase electrocatalytic oxidation technology and Fenton method. Background technique [0002] Nitrobenzene wastewater contains a large amount of nitrobenzene, nitroaniline, o-nitrotoluene, o-nitromethanol and other substances. These nitrobenzene derivatives have extremely high stability in water and are generally considered difficult to biodegrade It is not even biodegradable. With the development of pharmaceutical, chemical, dyestuff and other industries, there are more and more high-concentration refractory nitrobenzene wastewater, and their treatment has become a major difficulty in wastewater treatment. This type of wastewater has poor treatment effect with traditional treatment techniques, which has become a difficul...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F1/72
Inventor 肖凯军王新银玉容熊璞周显宏
Owner 广东华凯明信科技有限公司
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