Method and device for stripping, oxidizing and degrading high-concentration nitrobenzene-containing wastewater

A nitrobenzene wastewater, oxidative degradation technology, applied in chemical instruments and methods, water pollutants, water/sewage multi-stage treatment, etc., can solve the problem of high cost of high-concentration nitrobenzene wastewater, and improve the efficiency of ozone oxidation. , the effect of reducing the amount of production, and saving the processing cost

Active Publication Date: 2015-06-24
ZHONGBEI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0006] In order to solve the problem of high cost of treating wastewater containing high-concentration nitrobenzene by the advanced ozone oxidation...

Method used

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  • Method and device for stripping, oxidizing and degrading high-concentration nitrobenzene-containing wastewater
  • Method and device for stripping, oxidizing and degrading high-concentration nitrobenzene-containing wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0029] Example 1: Utilization figure 1 The process shown is to treat wastewater containing nitrobenzene. The concentration of nitrobenzene in the wastewater is 600mg / L, and the pH is 6.8. The speed of the supergravity reactor is 700 rpm. The gas-liquid ratio of fresh air and wastewater in the supergravity equipment in the blow-off stage is 200 L / m 3 When the concentration of nitrobenzene in wastewater is reduced to 80 mg / L, the treatment time can be shortened by 80% compared with traditional stripping equipment, and the stripping efficiency will be significantly reduced afterwards. At this time, advanced ozone oxidation technology is used for advanced treatment, and H is added to the blown off wastewater 2 O 2 , Making H in the mixed liquid of the supergravity reactor 2 O 2 The concentration is 0.1 mmol / L, the ozone concentration is 10 mg / L, and the liquid-gas ratio of wastewater to ozone is 0.5 L / m 3 , The cyclic treatment is 15 min, the nitrobenzene content in the wastewate...

Embodiment 2

[0030] Example 2: Utilization figure 1 The process shown is to treat wastewater containing nitrobenzene. The concentration of nitrobenzene in the wastewater is 1000 mg / L, and the pH is 7.1. The speed of the high gravity reactor is 500 rpm. The gas-liquid ratio of fresh air and wastewater in the supergravity equipment in the blow-off stage is 400 L / m 3 When the concentration of nitrobenzene in wastewater is reduced to 100 mg / L, the treatment time can be shortened by 80% compared with traditional stripping equipment, and the stripping efficiency will be significantly reduced afterwards. Advanced ozone oxidation technology is used for advanced treatment, and H is added to the waste water after blowing off 2 O 2 , Making H in the mixed liquid of the supergravity reactor 2 O 2 The concentration is 1.0 mmol / L, the ozone concentration is 15 mg / L, and the liquid-gas ratio of wastewater to ozone is 1.0 L / m 3 , Cyclic treatment for 15 minutes, the content of nitrobenzene in the wastewa...

Embodiment 3

[0031] Example 3: Utilization figure 1 The process shown is to treat wastewater containing nitrobenzene. The concentration of nitrobenzene in the wastewater is 1500mg / L, and the pH is 6.8. The speed of the supergravity reactor is 300 rpm. The gas-liquid ratio of fresh air and wastewater in the supergravity equipment in the blow-off stage is 500 L / m 3 When the concentration of nitrobenzene in wastewater is reduced to 90 mg / L, the treatment time can be shortened by 80% compared with traditional stripping equipment, and the stripping efficiency will be significantly reduced afterwards. Advanced ozone oxidation technology is used for advanced treatment, and H is added to the waste water after blowing off 2 O 2 , Making H in the mixed liquid of the supergravity reactor 2 O 2 The concentration is 2.9 mmol / L, the ozone concentration is 30 mg / L, and the liquid-gas ratio of wastewater to ozone is 2.0 L / m 3 , Cyclic treatment for 15 minutes, the content of nitrobenzene in the wastewate...

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Abstract

The invention belongs to the technical field of high-concentration nitrobenzene-containing wastewater treatment and provides a method and a device for stripping, oxidizing and degrading a high-concentration nitrobenzene-containing wastewater for solving the high cost problem of the high-concentration nitrobenzene-containing wastewater treatment through the ozone advanced oxidation process. The method comprises the steps of contacting the high-concentration nitrobenzene-containing wastewater with fresh air in a supergravity device to finish a stripping mass transfer process; sending the wastewater into a liquid storage groove after finishing mass transfer process and mixing with hydrogen peroxide, performing contact reaction with an ozone gas in a supergravity device, and degrading the residual organic matter in the wastewater under the synergistic effect of ozone and H2O2. By adopting the method, the ozone oxidation efficiency is increased, the processing time is shortened, the pollutant content in the wastewater is reduced through a blow-off method and the oxidation reaction is performed, the water quality change of the wastewater is furthest reduced, the intermediate product production is reduced, the ozone and the hydroxyl radical depleting substance production is reduced, the ozone oxidation efficiency is increased by 65-75%, the processing time is shortened by 80%, the ozone use amount is reduced by 70% and the processing cost is saved by about 50%.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment containing high-concentration nitrobenzene, and in particular relates to a method and device for blowing off, oxidizing and degrading wastewater containing high-concentration nitrobenzene. Background technique [0002] Explosive industrial wastewater often contains high concentrations of volatile and biologically toxic nitrobenzene compounds, which have strong carcinogenic and mutagenic properties. If they are discharged directly without treatment, they will cause serious harm to the human body and the environment. [0003] Air blowing is generally installed at the bottom of the water treatment with an aeration device. The air sent by the fan is dispersed into tiny bubbles, forming a gas-liquid two-phase in the main body of the wastewater, and the volatile organic compounds in the wastewater are transferred from the liquid phase to the gas phase. , leaving the main body of the liquid ...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F101/38
Inventor 刘有智焦纬洲张巧玲祁贵生袁志国高璟罗莹栗秀萍申红艳郭亮
Owner ZHONGBEI UNIV
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