Dephenolization method for phenol-containing wastewater by extraction

A technology for phenol wastewater and extraction, which is applied in chemical instruments and methods, extraction water/sewage treatment, water pollutants, etc. The effect of significant removal rate and difficulty reduction

Active Publication Date: 2017-06-20
CHINA UNIV OF MINING & TECH (BEIJING) +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the distribution coefficient of methyl isobutyl ketone to polyphenols is not high, such as the distribution coefficient of p-resorcinol is about 18, and the distribution coefficient of p-phloroglucinol is about 5, which makes it difficult to further improve the removal of wastewater. Phenol rate

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0023] A method for extracting and removing phenols from wastewater containing phenols, comprising the following steps: using cyclohexanone as an extractant at a temperature of 30° C. Perform three-stage countercurrent extraction to obtain an extract phase and a raffinate phase. Among them, the pH value of the phenolic wastewater is 6.5, and the volume ratio of the extractant to the phenolic wastewater is 1:6.

[0024] The raffinate phase was detected, and the residual concentration of unit phenols was 85mg / L, the residual concentration of polyphenols was 180mg / L, and the concentration of total phenols was 265mg / L. The calculation shows that the removal rate of unit phenols is 98.5%, the removal rate of polyphenols is 96.0%, and the removal rate of total phenols is 97.4%.

Embodiment 2

[0026] A method for extracting and removing phenols from wastewater containing phenols, comprising the following steps: using cyclohexanone as an extractant at a temperature of 25° C. Perform three-stage countercurrent extraction to obtain an extract phase and a raffinate phase. Among them, the pH value of the phenolic wastewater is 7, and the volume ratio of the extractant to the phenolic wastewater is 1:7.

[0027] The raffinate phase was detected, and the residual concentration of unit phenols was 130mg / L, the residual concentration of polyphenols was 350mg / L, and the concentration of total phenols was 480mg / L. The calculation shows that the removal rate of unit phenols is 98.4%, the removal rate of polyphenols is 96.2%, and the removal rate of total phenols is 97.2%.

Embodiment 3

[0029] A method for extracting and removing phenols from wastewater containing phenols, comprising the following steps: using cyclohexanone as an extractant at a temperature of 25° C. Perform three-stage countercurrent extraction to obtain an extract phase and a raffinate phase. Among them, the pH value of the phenolic wastewater is 6, and the volume ratio of the extractant to the phenolic wastewater is 1:5.

[0030] The raffinate phase was detected, and the residual concentration of unit phenol was 75mg / L, the residual concentration of polyphenol was 130mg / L, and the concentration of total phenol was 205mg / L. The calculation shows that the removal rate of unit phenols is 98.4%, the removal rate of polyphenols is 96.3%, and the removal rate of total phenols is 97.5%.

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Abstract

The invention provides a dephenolization method for phenol-containing wastewater by extraction. The dephenolization method comprises the following step: subjecting the phenol-containing wastewater to multistage countercurrent extraction with an extractant at 20 to 35 DEG C so as to obtain an extraction phase and a raffinate phase, wherein the extractant is cyclic ketone, and the pH value of the phenol-containing wastewater is 6 to 7. The dephenolization method by extraction provided by the invention has the following advantages: the removal rate of phenol in the phenol-containing wastewater can reach 96.5% or above, and more phenols can be recycled; meanwhile, the removal rate of polyphenol in phenols is significant; the concentration of residual phenol in wastewater is greatly reduced, thereby facilitating subsequent biochemical treatment; the quality of biochemical effluent is improved; the difficulty of reusing treatment of the wastewater is greatly reduced; and the change to operating conditions of equipment is small, thereby facilitating rapid application to the process of dephenolization by extraction.

Description

technical field [0001] The invention belongs to the technical field of wastewater treatment, and in particular relates to a method for extracting and dephenolizing wastewater containing phenol. Background technique [0002] Phenols are oxygen-containing derivatives of aromatic hydrocarbons. They are highly toxic and difficult to degrade. Direct discharge will cause serious pollution to water bodies. Phenol-containing wastewater mainly comes from the production processes of coal chemical industry, petrochemical industry, dyestuffs, organic pesticides, etc., especially coal chemical industry, which not only has a large amount of wastewater, but also has high phenol content. At home and abroad, the treatment of phenol-containing wastewater is very important, and a lot of research has been done, but the extraction method is mainly used in industry. [0003] Extraction dephenolization includes physical extraction and complex extraction. There are many kinds of extractants availa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/26C02F9/10C02F101/34
CPCC02F1/04C02F1/26C02F9/00C02F2101/345
Inventor 蔡卫滨王玉军陈猛钱建兵施龙生朱慎林
Owner CHINA UNIV OF MINING & TECH (BEIJING)
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