Method for removing aniline from industrial high salt-containing aniline wastewater

A technology of aniline wastewater and high salt content, applied in chemical instruments and methods, water pollutants, multi-stage water/sewage treatment, etc. Wide range of effects with significant economic benefits and low treatment costs

Inactive Publication Date: 2013-02-20
BINZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption method is not effective for the treatment of high-concentration aniline wastewater, and it is difficult to recover aniline after adsorption, the desorption liquid is not easy to reuse, and the regeneration of the adsorbent is difficult, resulting in high aniline treat

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0017] The method for removing aniline from industrial high-salt aniline wastewater, the steps of the method are:

[0018] a. The aniline wastewater is treated by solvent extraction under the effect of salting out. In the static mixed reactor at atmospheric pressure, the wastewater, sodium chloride solution and nitrobenzene as the extraction solvent are mixed to control the pH value of the wastewater to 10, and the wastewater The volume ratio of sodium chloride and nitrobenzene is 2: 1, and the amount of sodium chloride is 1% of the waste water weight. It is injected into the tubular static mixing reactor through the raw material pump. Benzene and aniline wastewater are fully mixed, then enter the storage tank, and the organic phase is reused after stratification in the storage tank;

[0019] b. The water phase after stratification in the storage tank, that is, the raffinate, is subjected to aerobic-anaerobic microbial oxidation combined process treatment, under the conditions...

Embodiment 2

[0021] The method for removing aniline from industrial high-salt aniline wastewater is characterized in that the steps of the method are:

[0022] a. The aniline wastewater is treated by the solvent extraction method under the action of salting out. In the static mixed reactor at normal pressure, the wastewater, sodium chloride solution and nitrobenzene as the extraction solvent are mixed to control the pH value of the wastewater to 13, and the wastewater The volume ratio of sodium chloride and nitrobenzene is 3: 1, and the consumption of sodium chloride is 10% of waste water weight, is injected into tubular static mixing reactor through feed pump, at 20 ℃ of temperature, residence time 5min, makes extraction solvent nitric acid Benzene and aniline wastewater are fully mixed, then enter the storage tank, and the organic phase is reused after stratification in the storage tank;

[0023] b. The water phase after stratification in the storage tank, that is, the raffinate, is subj...

Embodiment 3

[0025] The method for removing aniline from industrial high-salt aniline wastewater is characterized in that the steps of the method are:

[0026] a. The aniline wastewater is treated by solvent extraction under the effect of salting out. In the static mixed reactor at normal pressure, the wastewater, sodium chloride solution and nitrobenzene as the extraction solvent are mixed to control the pH value of the wastewater to 12. The volume ratio of sodium chloride and nitrobenzene is 2.5: 1, and the consumption of sodium chloride is 5% of waste water weight, is injected into tubular static mixing reactor through raw material pump, at 25 ℃ of temperature, residence time 4min, makes extraction solvent nitrobenzene Benzene and aniline wastewater are fully mixed, then enter the storage tank, and the organic phase is reused after stratification in the storage tank;

[0027] b. The water phase after stratification in the storage tank, that is, the raffinate, is subjected to aerobic-ana...

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PUM

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Abstract

The invention provides a method for removing aniline from industrial high salt-containing aniline wastewater. The method comprises the steps of processing aniline wastewater via a solvent extraction method under the action of a salting-out effect; mixing the wastewater, sodium chloride and nitrobenzene used as an extracting solvent in an atmospheric static mixing reactor; pumping the mixture to a tubular static mixing reactor via a raw material pump to make the extracting solvent nitrobenzene mixed with the aniline wastewater thoroughly; processing the raffinate with an aerobic-anaerobic microbial oxidation combined process; passing the raffinate through the anaerobic tank to perform anaerobic degradation treatment; and passing the anaerobic treated wastewater into the aerobic tank to perform aerobic degradation treatment. With the method for removing aniline from industrial aniline wastewater, aniline can be separated out from the industrial aniline wastewater effectively; the extracted and separated aniline and the extracting agent can be reused without separation; the separating process generates no pollutions; energy consumption of the separation is low; and processing cost of the separation is low. The method can be used for the aniline wastewater generated by industries of dye, agriculture, medicine, military industry, chemical industry, etc.

Description

technical field [0001] The invention provides a treatment method for industrial aniline wastewater, in particular a method for removing aniline from industrial high-salt aniline wastewater to realize resource utilization of the wastewater. Background technique [0002] Aniline is an important organic chemical raw material and chemical product. There are more than 300 kinds of chemical products and intermediates produced from it. It is produced in MDI (diphenylmethane diisocyanate), dyes, pigments, medicines, pesticides, explosives, Rubber additives and other industries have a wide range of applications. Aniline wastewater has high concentration (aniline content is about 4%), high toxicity, dark color, high salt content (16%), poor biodegradability, COD index reaches 40000mg / L, and the treatment efficiency of traditional physical and chemical methods is very low. Dangerous organic industrial wastewater that is difficult to treat. The direct discharge of this wastewater will c...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F3/30C02F1/26C02F101/38
Inventor 李长海李跃金杨仲年刘学文
Owner BINZHOU UNIV
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