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A method for multistage static mixing, clarification, extraction and dephenolation of phenolic wastewater

A technology of static mixing and static mixer, applied in chemical instruments and methods, extraction water/sewage treatment, water/sewage treatment, etc. The effect of large processing capacity, stable and reliable equipment operation, and high stage efficiency

Active Publication Date: 2016-08-24
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the extraction unit of phenol-containing wastewater in industrial coal chemical industry is usually carried out in the extraction tower. The commonly used extraction towers are packed extraction tower and rotary disk extraction tower. Both of them have serious back-mixing between stages, low stage efficiency, and separation interface. Difficult to control and other issues

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  • A method for multistage static mixing, clarification, extraction and dephenolation of phenolic wastewater

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Experimental program
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Effect test

Embodiment 1

[0025] According to the method of the present invention, the phenol-containing wastewater of coal chemical industry is treated, and methyl isobutyl ketone is used as the dephenol extraction agent, and the static mixer and the clarification tank are used to replace the extraction tower, and the phenol-containing wastewater after deacidification and deamination is processed in the static mixer and the clarifier. The extraction is completed in the clarification tank, and then the extract phase and raffinate phase enter the phenol tower and the water tower respectively for solvent recovery.

[0026] Coal chemical industry phenolic wastewater, total phenol content 12700mg / L, polyphenol 4250mg / L, COD content 34852mg / L, countercurrent extraction with dephenol extraction agent methyl isobutyl ketone in the combination of static mixer and clarifier, extraction grade The number of stages is 8, the volume ratio of dephenol extractant to phenol-containing wastewater is 1:3, the extraction ...

Embodiment 2

[0029] According to the method of the present invention, the phenol-containing wastewater of coal chemical industry is treated, and methyl isobutyl ketone is used as the dephenol-removing extractant, and the combination of a static mixer and a clarifier is used to replace the extraction tower, and the phenol-containing wastewater after deacidification and deamination is placed in the static mixer. After that, the extraction phase and the raffinate phase enter the phenol tower and the water tower respectively for solvent recovery. Specific process such as figure 1 Shown: the number of extraction stages is 5 (that is, the combination of 5 static mixers and clarifiers), 1 is the static mixer of the first combination, 2 is the clarifier of the first combination, and 3 is deacidification and deacidification The phenol-containing wastewater after ammonia, 4 is the extraction phase, 5 is the wastewater after dephenolization, and 6 is the dephenol extraction agent from the solvent sto...

Embodiment 3

[0033] According to the method of the present invention, the phenol-containing wastewater of coal chemical industry is treated, and methyl isobutyl ketone is used as the dephenol-removing extractant, and the combination of a static mixer and a clarifier is used to replace the extraction tower, and the phenol-containing wastewater after deacidification and deamination is placed in the static mixer. After that, the extraction phase and the raffinate phase enter the phenol tower and the water tower respectively for solvent recovery.

[0034]Coal chemical industry phenolic wastewater, total phenol content 12700mg / L, polyphenol 4250mg / L, COD content 34852mg / L, countercurrent extraction with dephenol extraction agent methyl isobutyl ketone in the combination of static mixer and clarifier, extraction grade The number of stages is 8, the volume ratio of dephenol extractant to phenol-containing wastewater is 1:10, the extraction temperature is 50°C, and the pH value is 5. The extraction...

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Abstract

The invention discloses a method for multistage static mixing, clarification, extraction, and dephenolization of phenol-containing wastewater. The method is specifically as follows: arrange 2 to 8 groups of static mixers and clarification tank combinations according to the waste water direction; the extract phase in the upper part of the clarification tank flows into the static mixer of the previous combination continuously, and the raffinate phase in the lower part of the clarification tank, that is, the waste water, continuously flows into the lower part. In a combination of static mixers; the first set of static mixers enters the wastewater just after deacidification and deamination, and the extract phase on the upper part of the clarification tank enters the phenol column for solvent recovery; the last set of static mixers adds fresh dephenol extractant to clarify The raffinate phase in the lower part of the tank enters the water tower for solvent stripping and recovery. The method of the invention has clear extraction stages, better effect, and reduces the occupied area of ​​the mixing process.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a method for multistage static mixing, clarification, extraction, and dephenolization of phenol-containing wastewater. Background technique [0002] High-concentration phenolic ammonia-containing wastewater from coal chemical industry usually contains ammonia nitrogen, sulfide, dust, coal tar, unit phenol, polyphenol and other organic pollutants. The content of phenolic substances can reach 2000-25000mg / L, among which, the content of unit phenols is 1000-9000mg / L, the content of polyphenols is 1000-16000mg / L, and the COD value is 15000-65000mg / L. When treating this kind of phenolic wastewater, the method of extraction is usually adopted. Most of the phenolic substances enter the extraction phase, and the crude phenolic products and extractant are obtained through rectification and separation. The content of phenolic substances remaining in the raffinate phase Very low...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F1/26C02F1/04C02F1/58
Inventor 陈赟王卓张鹏羽
Owner SOUTH CHINA UNIV OF TECH