Method for treating waste water in coal chemical industry

A technology for coal chemical wastewater and treatment method, applied in the direction of extraction water/sewage treatment, etc., can solve the problems of low biodegradability of wastewater and weak extraction effect, achieve low energy consumption for solvent recovery, and ensure discharge or reuse and recovery. Efficient effect

Inactive Publication Date: 2012-09-12
QINGDAO UNIV OF SCI & TECH +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although these extractants have a good extraction effect on phenols, they have weak extraction effects on petroleum hydrocarbons and tar pollutants, so the biodegradability of treated wastewater is still low.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] A set of coal gasification wastewater treatment plant with a treatment capacity of 40 tons / hour of wastewater, the total phenol content is 6600mg / L, the oil content is 900mg / L, pH 7.0, COD 27000mg / L. Using the method of the present invention, methyl pentenone is selected as the extraction agent, and the extraction equipment is a packed extraction tower. Pump waste water and extractant into the extraction tower from the top and bottom of the extraction tower respectively, carry out countercurrent extraction to obtain the solvent phase and the raffinate water phase, and then recover the solvent and crude phenol from the solvent phase by rectification, and extract the raffinate water The residual extraction solvent is recovered by distillation. The recovered extractant is recycled. The extraction temperature is 50°C, the extraction pH is 7.0, the volume ratio of extractant to phenol-containing wastewater is 1:6, and the extraction stages are about 4.

[0022] The total p...

Embodiment 2

[0025] A set of coal gasification wastewater treatment device with a treatment capacity of 80 tons / hour of wastewater, the total phenol content is 5400mg / L, pH 6.0, COD 22000mg / L, using the method of the present invention, the extraction agent is methyl pentenone, and the extraction The equipment is a four-stage mixing clarifier in series. The waste water and the extractant are respectively added from the first stage and the last stage mixing clarifier to obtain the solvent phase and the raffinate water phase, and then the solvent phase is rectified to recover the solvent and crude phenol, and the raffinate water phase is obtained by distillation method to recover the residual extraction solvent. The recovered extractant is recycled. The extraction temperature is 55°C, the extraction pH is 8.0, the volume ratio of the extractant to the phenol-containing wastewater is 1:5, and the extraction stages are 5 stages.

[0026] The total phenol content in the treated wastewater is a...

Embodiment 3

[0029] A set of coal gasification wastewater treatment device with a processing capacity of 300 tons / hour of wastewater, the total phenol content is 7600mg / L, pH 6.5, COD 19000mg / L, using the method of the present invention, the extraction agent is methyl pentenone, and the extraction The equipment is an extraction tower. Pump waste water and extractant into the extraction tower from the top and bottom of the extraction tower respectively, carry out countercurrent extraction to obtain the solvent phase and the raffinate water phase, and then recover the solvent and crude phenol from the solvent phase by rectification, and extract the raffinate water The residual extraction solvent is recovered by distillation. The recovered extractant is recycled. The extraction temperature is 45°C, the extraction pH is 6.5, the volume ratio of extractant to phenol-containing wastewater is 1:4, and the extraction stages are 4.

[0030] The total phenol content in the treated wastewater is ab...

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PUM

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Abstract

The invention relates to a method for treating waste water in coal chemical industry. The method comprises the following steps of: extracting and dephenolizing the waste water which contains phenol, tars, petroleum hydrocarbons and chemical oxygen demand (COD) and is subjected to gasification, coking, destructive distillation, liquefaction and the like in the coal chemical industry and methyl amylene ketone serving as an extracting agent in an extraction tower or a mixed clarificator. By the method, most of pollutants of the tars and the petroleum hydrocarbons can be removed simultaneously, the pollution load of the waste water is reduced, the load of a subsequent biochemical section can be relieved, and the discharge of the waste water can reach the standard or the waste water can be recycled.

Description

[0001] technical field [0002] The invention relates to the extraction and dephenolation of phenol-containing wastewater produced in coal chemical processes such as gasification, coking, dry distillation, and liquefaction, while removing most of the tar and petroleum hydrocarbon pollutants, reducing the pollution load of wastewater, and finally realizing Standardized treatment of such wastewater. It belongs to the field of waste water treatment. [0003] Background technique [0004] The phenol-containing wastewater produced in the coal chemical industry has a large pollution load, and the pollutants such as phenols, petroleum hydrocarbons, and tars are difficult to biodegrade, so this type of wastewater is a difficult problem for environmental protection. On the other hand, phenols and other pollutants are also important chemical raw materials. Therefore, efficient removal and recovery of phenols and other pollutants in coal chemical industry wastewater is an effectiv...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/26
Inventor 盖恒军姜成旭刘永健王立夫谷力彬王季秋
Owner QINGDAO UNIV OF SCI & TECH
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