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Method and device for treating nitrobenzene wastewater through ultrasonic wave/iron-carbon micro-electrolysis-Fenton oxidation method

A technology of nitrobenzene wastewater and iron-carbon micro-electrolysis, applied in water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problems of reduced treatment efficiency, weakened anode reaction, low efficiency, etc. Achieve the effect of increasing reaction rate, reducing H2O2, and removing easy passivation

Pending Publication Date: 2016-08-24
ZHONGBEI UNIV
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  • Abstract
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Problems solved by technology

[0009] The present invention solves the low efficiency of single ultrasonic treatment of organic pollutants in waste water in the prior art and the direct treatment of waste water by the traditional iron-carbon micro-electrolysis-Fenton method. The problem of greatly reducing the treatment efficiency and weakening the anode reaction provides a method and device for treating nitrobenzene wastewater by ultrasonic / iron-carbon micro-electrolysis-Fenton oxidation

Method used

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  • Method and device for treating nitrobenzene wastewater through ultrasonic wave/iron-carbon micro-electrolysis-Fenton oxidation method

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Example 1: Using figure 1 The flow chart of the device shown is for the treatment of wastewater containing nitrobenzene. The concentration of nitrobenzene in the water sample is 350 mg / L, and the pH value is 2. Inject 2 cubic meters of nitrobenzene wastewater into the micro-electrolyzer, the concentration of scrap iron is 10g / L, the mass ratio of iron to carbon is 1:1, the ultrasonic output power is 6kW, and the flow rate of cooling water circulating inside and outside the jacket is 45L / h , reacted for 40 min, 90% of nitrobenzene was reduced to aniline, the reaction rate was 8 times higher than that of the traditional iron-carbon micro-electrolysis method, and the free Fe in the wastewater 2+ Concentration increased by 6.8 times. At this time, inject the wastewater in the micro-electrolyzer into the stirred reaction tank, and add H at the same time 2 o 2 The concentration is 0.025mol / L, the stirring rate of the agitator is 200 rpm, and after 25 minutes of reaction, ...

Embodiment 2

[0033] Example 2: Using figure 1 The flow chart of the device shown is for the treatment of wastewater containing nitrobenzene. The concentration of nitrobenzene in the water sample is 500 mg / L, and the pH value is 3. Inject 2 cubic meters of nitrobenzene wastewater into the micro-electrolyzer, the concentration of scrap iron is 30 g / L, the mass ratio of iron to carbon is 3:1, the ultrasonic output power is 8kW, and the flow rate of cooling water circulating inside and outside the jacket is 25 L / h, reacted for 40 min, 96% of nitrobenzene was reduced to aniline, the reaction rate increased by 10 times compared with the traditional iron-carbon micro-electrolysis method, and the free Fe in the wastewater 2+ Concentration increased by 8 times. At this time, inject the wastewater in the micro-electrolyzer into the stirred reaction tank, and add H at the same time 2 o 2 The concentration is 0.04mol / L, the stirring rate of the agitator is 300 rpm, and the mineralization rate of ...

Embodiment 3

[0034] Example 3: Using figure 1 The flow chart of the device shown is for the treatment of wastewater containing nitrobenzene. The concentration of nitrobenzene in the water sample is 300mg / L, and the pH value is 4. Inject 2 cubic meters of nitrobenzene wastewater into the micro-electrolyzer, the concentration of scrap iron is 20 g / L, the mass ratio of iron to carbon is 1:3, the ultrasonic output power is 4kW, and the flow rate of cooling water circulating inside and outside the jacket is 25 L / h, reaction 35 min, 95% of nitrobenzene is reduced to aniline, the reaction rate is 6 times higher than the traditional iron-carbon micro-electrolysis method, and the free Fe in the wastewater 2+ Concentration increased by 5 times. At this time, inject the wastewater in the micro-electrolyzer into the stirred reaction tank, and add H at the same time 2 o 2 The concentration is 0.01mol / L, the stirring speed of the stirrer is 100 rpm, and after 30 minutes of reaction, the mineralizat...

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Abstract

The invention belongs to the technical field of treatment of nitrobenzene wastewater, and particularly relates to a method and device for treating nitrobenzene wastewater through an ultrasonic wave / iron-carbon micro-electrolysis-Fenton oxidation method. The problems in the prior art that efficiency is low when organic pollutant in wastewater is treated only through ultrasonic waves, when a traditional iron-carbon micro-electrolysis-Fenton method is directly used for treating wastewater, along with delay of treating time, due to passivation of iron-carbon micro-electrolysis filler, the treating efficiency is greatly lowered, and anodic reaction is weakened are solved. The method comprises the steps that nitrobenzene wastewater is treated through ultrasonic waves and iron-carbon micro-electrolysis, and nitrobenzene difficult to degrade is reduced to be aniline easy to degrade; after micro-electrolysis is finished, wastewater is placed into a stirring reaction pool, H2O2 is added into wastewater to be combined with Fe2+ in wastewater to form a Fenton reagent, and wastewater is further oxidized and degraded. The reaction speed of iron-carbon micro-electrolysis is improved by 6-10 times on the whole, the concentration of free Fe2+ in wastewater is improved by 5-8 times, and H2O2 needed by the follow-up Fenton oxidization method is greatly reduced.

Description

technical field [0001] The invention belongs to the technical field of treating nitrobenzene wastewater, and in particular relates to a method and device for treating nitrobenzene wastewater by ultrasonic / iron-carbon micro-electrolysis-Fenton oxidation, which adopts ultrasonic technology, iron-carbon micro-electrolysis and Fenton oxidation The method works together to treat nitrobenzene wastewater. Background technique [0002] In recent years, iron-carbon micro-electrolysis is often combined with Fenton oxidation to treat wastewater, especially nitrobenzene wastewater. During the iron-carbon micro-electrolysis reaction, iron as the anode loses electrons and releases Fe 2+ In wastewater (as shown in Equation 1), H + Absorb electrons on the cathode carbon to generate strong reducing agent nascent hydrogen [H] (as shown in formula 2) to reduce and degrade organic pollutants. Iron-carbon micro-electrolysis is a reduction method, which can only destroy the complex organic mac...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/08C02F101/38
CPCC02F9/00C02F1/36C02F1/46104C02F1/722C02F2101/38
Inventor 焦纬洲余丽胜刘有智栗秀萍祁贵生袁志国张巧玲高璟罗莹申红艳
Owner ZHONGBEI UNIV
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