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Efficient dephenolization method of wastewater containing oil and solid suspend matter

A waste water and dephenolization technology, which is applied in chemical instruments and methods, water pollutants, water/sewage treatment, etc., can solve the problems of extractant loss, increase energy consumption of extractant recovery, fouling and other problems, achieve stability improvement, Improve the extraction effect and the effect of effluent water quality

Inactive Publication Date: 2018-06-22
CCTEG CHINA COAL RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

In the field of coal chemical industry, such as coal pressurized fixed bed gasification, coal pyrolysis, coal liquefaction and tar processing process, the waste water contains oil and has a high concentration of suspended solids. At present, the extraction of phenolic waste water in the industrial field is often carried out in extraction towers and centrifuges. , there will be more serious fouling problems, which will affect the normal operation of the extraction tower and centrifuge. At the same time, the oil and solid suspended matter in the wastewater will seriously affect the mass transfer between the extraction agent and the wastewater, and cause the separation of the two phases after extraction to be unclear and entrained. , resulting in the loss of extractant and increasing the energy consumption of extractant recovery

Method used

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  • Efficient dephenolization method of wastewater containing oil and solid suspend matter

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0040] Example 1, Extraction and dephenolization of phenol-containing wastewater after coal pyrolysis deacidification and deamination

[0041] according to figure 1 The process flow chart shown in the process extracts and removes phenols from coal chemical industry wastewater containing phenols. The specific steps are as follows:

[0042] The coal pyrolysis high-concentration phenol-containing wastewater used has been deacidified, deaminated and deoiled in advance, 32t / h, the total phenol content is 10750mg / L, the polyphenol content is 5820mg / L, the COD value is 52000mg / L, and the pH value is 8.0 , the temperature is 52°C.

[0043] 1) Pretreatment - synchronous degreasing and solid removal:

[0044] Mix the wastewater to be treated with the extract phase obtained from the top of the extraction tower in the mixing tank, add 0.08% polyferric sulfate (PFS) of the wastewater quality as a coagulant and mix for 3 minutes; then add flocculant polyacrylamide (PAM) per ton of wastewa...

Embodiment 2

[0053] Example 2, Extraction and dephenolization of phenol-containing wastewater after coal pyrolysis deacidification and deamination

[0054] Used waste water to be treated is identical with embodiment 1;

[0055] According to the step of embodiment 1, only the quality of coagulant used in step 1) is replaced by 0.08% of waste water quality to 0.05% of waste water quality, and the quality of flocculant is replaced by 4 grams to 3 grams, and mixture enters clarifier and leaves standstill The residence time for precipitation was replaced from 6 hours to 8 hours.

[0056] After detection and analysis, the total phenol content of wastewater after dephenolization is 292mg / L, the content of polyphenols is 245mg / L, and the COD is 2996mg / L.

Embodiment 3

[0057] Example 3, Extraction and dephenolization of phenol-containing wastewater after coal pyrolysis deacidification and deamination

[0058] Used waste water to be treated is identical with embodiment 1;

[0059] According to the step of embodiment 2, only step 2) the flow rate of extractant is replaced by 16t / h by 8t / h; Step 3) the number of theoretical plates in the phenol tower is replaced by 15 to 22, step 4) in the water tower The number of theoretical boards is changed from 8 to 12.

[0060] After detection and analysis, the total phenol content of wastewater after dephenolization is 186mg / L, the content of polyphenols is 128mg / L, and the COD is 1956mg / L.

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Abstract

The invention discloses an efficient dephenolization method of wastewater containing oil and solid suspend matter. The method comprises the steps of 1, mixing wastewater containing phenol with coagulant and flocculant, and standing and settling to obtain an oil phase at the upper portion, an aqueous phase at the lower portion and a bottom precipitate; 2, making the aqueous phase obtained in step 1in countercurrent contact with extraction agent from top to bottom for extraction, obtaining an extraction phase and a raffinate phase after extraction is completed, and mixing the extraction phase with the wastewater containing phenol obtained in step 1; 3, conducting rectification on the oil phase obtained in step 1, and obtaining the recycled extraction agent and a crude phenol product; 4, conducting steam stripping on the raffinate phase to obtain dephenolization wastewater and a mixture which is composed of the recycled extraction agent and the wastewater; standing and layering the mixture which is composed of the recycled extraction agent and the wastewater to obtain the recycled extraction agent. By means of the efficient dephenolization method, the extracting effect and the effluent water quality can be obviously improved.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and in particular relates to an efficient dephenolization method for wastewater containing oil and solid suspended matter. Background technique [0002] Phenolic substances in wastewater are toxic to organisms and inhibit the growth of microorganisms, resulting in unstable and efficient operation of biochemical systems. However, as chemicals, phenols can be recycled. At present, the commonly used method for phenol-containing industrial wastewater is to remove phenolic substances by solvent extraction to improve the biodegradability of wastewater. Using the principle of similar compatibility, most of the phenolic substances enter the extraction phase and obtain crude phenolic products through rectification separation. The extractant is recycled, and the extractant left in the raffinate phase is stripped and recycled by the solvent stripper. In the field of coal chemical industry, such as coal ...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F101/34
CPCC02F1/048C02F1/26C02F1/5245C02F1/5281C02F1/56C02F9/00C02F2001/007C02F2101/345C02F2209/08C02F2209/10
Inventor 陈贵锋高明龙王吉坤付楚芮董卫果王亚强贾媛杜松段锋田陆峰何俊郑陈晨
Owner CCTEG CHINA COAL RES INST