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Method for degrading aminobenzene or/and nitrobenzene in waste water by electrolytic process

A nitrobenzene, electrolysis technology, applied in chemical instruments and methods, water/sewage treatment, water/sludge/sewage treatment, etc., can solve the problems of difficulty in ensuring stable compliance, high price, and low removal rate.

Inactive Publication Date: 2008-05-21
NANJING UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

At present, the methods for this kind of wastewater treatment are mainly physical methods such as adsorption, extraction, steam stripping, chemical oxidation, micro-electrolysis, biological treatment, etc., all of which have defects of one kind or another - either expensive, or removal rate Not high, or difficult to ensure stable compliance

Method used

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  • Method for degrading aminobenzene or/and nitrobenzene in waste water by electrolytic process
  • Method for degrading aminobenzene or/and nitrobenzene in waste water by electrolytic process

Examples

Experimental program
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Effect test

Embodiment 1

[0022] M type dye wastewater, aniline concentration 210mg / l, nitrobenzene concentration 240mg / l, salt content 15g / l, chroma 3500 times. Get waste water 500ml and place in electrolyzer anode chamber 5, as figure 2 shown. Get 500ml of 0.5% NaOH solution and place it in the cathode chamber 6 of the electrolyzer, and circulate with circulation pump 8 respectively. The material of 1 is titanium base coated with ruthenium (produced by Future Water Chemical Co., Ltd., Xinxiang City, Henan Province), the material of cathode 3 is stainless steel, the specification is 0.2×0.4m, and the circulating liquid flow rate of anode chamber 5 and cathode chamber 6 is 20L / h , the wastewater in the anode chamber 5 is controlled by the electric heater 10 at a temperature of 60° C., pH=4, under a DC electric field voltage of 3 V, and a cycle time of 3 hours. After the shutdown, sampling and analysis are performed. After treatment, the removal rate of aniline in the wastewater was 97.5%, the remova...

Embodiment 2

[0024] K-type dye wastewater, aniline concentration 175mg / l, nitrobenzene concentration 199mg / l, salt content 10g / l, chroma 4000 times. Get waste water 500ml and place in electrolyzer anode chamber 5, as figure 2 shown. Get 500ml of 4% NaOH solution and place it in the cathode chamber 6 of the electrolyzer without pump circulation. The cation exchange membrane 9 is a polyethylene heterogeneous cation exchange membrane (the 3362BW type produced by Shanghai Shanghua Water Treatment Material Co., Ltd.), and the material of the anode 1 Coating iridium on a titanium base (produced by Future Water Chemical Co., Ltd., Xinxiang City, Henan Province), the material of the cathode 3 is stainless steel, the specification is 0.2×0.4m, and the temperature of the waste water in the anode chamber 5 is controlled by a heater 10 to be 40° C., pH=6 , under the DC field voltage of 4V, the cycle time is 3h. Sampling analysis after shutdown, after treatment, the removal rate of aniline in the wa...

Embodiment 3

[0026] Nitrobenzene production wastewater, aniline concentration 340mg / l, nitrobenzene concentration 284mg / l. Get waste water 500ml and place in the electrolyzer 4 that has stirrer 2, as figure 1 As shown, the material of the anode 1 is titanium-based coated lead dioxide (Henan Xinxiang City Future Water Chemical Co., Ltd.), the material of the cathode 3 is graphite (Nantong Carbon Factory), and the temperature of the wastewater in the electrolytic cell is controlled by a heater to normal temperature (25°C), DC electric field voltage 10V, electrolysis time 3h. Sampling and analysis after shutdown showed that the removal rate of aniline in the treated wastewater was 95.4%, 83.2% of nitrobenzene, 85.2% of TOC, and 75% of chroma.

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Abstract

The invention is a method for degrading aniline or / and nitrobenzene in waste water by electrolysis process, adopting an electrobath with a dividing cation exchange membrane in the middle, adding the waste water containing aniline or / and nitrobenzene and salts into an anode chamber, adding thin NaOH solution into an cathode chamber, circulating by circulating pump, separately, where the anode material is Ti-base coated ruthenium or Ti-base coated lead dioxide, and the cathode material is stainless steel or graphite, electrolyzing by DC, and oxidizing and degrading and removing aniline or / and nitrobenzene, and besides, cations dissociated from the salts in the waste water pass through the cation exchange membrane into the cathode chamber under the action of the DC electric field and combine with OH groups to produce hydroxides, thus able to recover alkali solution and desalt the waste water so as to benefit follow-up biochemical processing units. And after the solutions in the anode and cathode chambers are circulated for a period of time, it samples them, and as the concentrations of the aniline or / and nitrobenzene in the solution in the anode chamber decrease to the required values, it stops operating and discharges the solutions.

Description

technical field [0001] The invention relates to a wastewater treatment method, in particular to an aniline or nitrobenzene wastewater treatment method. Background technique [0002] In the production process of fine chemical industry and light industry, various kinds of aniline and nitrobenzene wastewater are often produced, which are difficult to biodegrade. At present, the methods for this kind of wastewater treatment are mainly physical methods such as adsorption, extraction, steam stripping, chemical oxidation, micro-electrolysis, biological treatment, etc., all of which have defects of one kind or another - either expensive, or removal rate Not high, or difficult to ensure stable compliance. Contents of the invention [0003] The object of the present invention is to provide an electrochemical treatment method for aniline or nitrobenzene wastewater, which degrades aniline and nitrobenzene through the electrode reaction and catalytic oxidation in the anode chamber. ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/461C02F1/58
Inventor 赵玉明康娟龚点图
Owner NANJING UNIV
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