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A method and device for treating high-concentration nitrobenzene-containing wastewater by stripping-micro-electrolysis-fenton oxidation

A nitrobenzene wastewater, high-concentration technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. and other problems, to achieve the effect of reducing the cost of water treatment, improving the oxidation efficiency and shortening the reaction time.

Active Publication Date: 2017-04-12
ZHONGBEI UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] For high-concentration nitrobenzene wastewater, there is a problem of poor treatment efficiency by using stripping method, micro-electrolysis method or Fenton method alone.
During the degradation of organic compounds, intermediate products such as small molecular acids and alcohols will compete with target pollutants and react with hydroxyl radicals, which will significantly reduce the oxidation treatment effect
When the content of organic matter is high, more intermediate products will be generated, the quality of wastewater will become worse, and the oxidation effect will be significantly reduced

Method used

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  • A method and device for treating high-concentration nitrobenzene-containing wastewater by stripping-micro-electrolysis-fenton oxidation

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] Example 1: Using figure 1 The flow shown is for the treatment of wastewater containing nitrobenzene. The concentration of nitrobenzene in the water sample was 600mg / L, the pH value was 2.5, and the biochemical coefficient was only 0.1. The inner diameter of the supergravity reactor packing is 40 mm, the outer diameter is 75 mm, and the rotation speed is 1200 rpm. During the stripping process, the waste water flow rate is 25 L / h, and the gas-liquid ratio of fresh air and waste water in the supergravity equipment is 0.8 m 3 / L, the mass transfer rate of nitrobenzene from the liquid phase to the gas phase is increased by 2 times compared with the traditional method. When the concentration of nitrobenzene in the wastewater is 100 mg / L, the stripping time is reduced by 50% compared with conventional air stripping. At this time, micro-electrolysis is used to treat 2.0 L of wastewater, and the pH is adjusted to 3 with dilute hydrochloric acid. The amount of powder added is ...

Embodiment 2

[0051] Example 2: Using figure 1 The procedure shown treats a water sample containing nitrobenzene at a concentration of 800 mg / L. The inner diameter of the supergravity reactor packing is 30 mm, the outer diameter is 60 mm, and the rotation speed is 900 rpm. During the stripping process, the waste water flow rate is 35 L / h, and the gas-liquid ratio of fresh air and waste water in the supergravity equipment is 0.4 m 3 / L, the mass transfer rate of nitrobenzene from the liquid phase to the gas phase is increased by 2 times compared with the traditional method. When the concentration of nitrobenzene in the wastewater is 100 mg / L, the stripping time is reduced by 60% compared with conventional air stripping. At this time, the wastewater is passed into the micro-electrolyzer, and the pH value is adjusted to 2.0 with dilute sulfuric acid. Take 2L of water sample, and use micro-electrolysis to pretreat the wastewater. The amount of iron powder added is 10g / L, the mass ratio of iro...

Embodiment 3

[0052] Example 3: Using figure 1 The procedure shown treats a water sample containing nitrobenzene at a concentration of 900 mg / L. The inner diameter of the supergravity reactor packing is 0.6 m, the outer diameter is 1.4 m, and the rotation speed is 300 rpm. During the stripping process, the waste water flow rate is 25 L / h, and the gas-liquid ratio of fresh air and waste water in the supergravity equipment is 0.6 m 3 / L, the mass transfer rate of nitrobenzene from the liquid phase to the gas phase is 1.5 times higher than that of the traditional method. When the concentration of nitrobenzene in the wastewater is 80 mg / L, the stripping time is reduced by 60% compared with conventional air stripping. At this time, micro-electrolysis is used to pretreat 1.5L of wastewater, and dilute sulfuric acid is used to adjust the pH to 2.5. The amount of iron powder added is 30g / L, the mass ratio of iron to carbon Fe:C=1:1, the reaction time is 15 min, and the stirring speed of the stirr...

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Abstract

The invention provides a method and device for treating high-concentration nitrobenzene-containing waste water by using air-stripping-microelectrolysis-fenton oxidation method, belongs to the technical field of high-concentration nitrobenzene-containing waste water treatment, and aims to solve the problems that the fenton method is high in treatment cost and toxic intermediate products are easy to produce to cause secondary pollution, and the nitrobenzene contaminants cannot be mineralized into inorganic small molecular materials through a single micro electrolysis method. According to the method, air-stripping mass transferring between the high-concentration nitrobenzene-containing waste water and the air can be completed in a hypergravity device, after air stripping is finished, the waste water is introduced into a ferric-carbon microelectrolysis tank with a stirring device for microelectrolysis reduction reaction, then hydrogen peroxide is added into the microelectrolysis tank, ferrous ions in the waste water and the hydrogen peroxide form a fenton reagent, hydroxyl free radicals with a high oxidizing property can be generated, and finally organic matters in the waste water can be oxidized and degraded. The process is simple, the function of each technology is maximized, so that the purpose of using waste to treat waste is achieved, the treatment cost is reduced to the largest extent, the treatment efficiency is improved by 20%, the reaction time is shortened by 25%, and the treatment cost is greatly reduced.

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 treating wastewater containing high-concentration nitrobenzene by stripping-micro-electrolysis-Fenton oxidation. Background technique [0002] Nitrobenzene (NB) is an important chemical raw material widely used in petrochemical, fuel, material and coking industries. However, its chemical properties are stable, it is not easy to be biodegraded, and it has strong carcinogenic and mutagenic properties. It has been listed as a priority pollutant by many countries. [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 phas...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06
Inventor 焦纬洲刘有智高璟栗秀萍罗莹申红艳祁贵生袁志国张巧玲郭亮
Owner ZHONGBEI UNIV
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