Separation treatment method for waste water in coal tar machining process

A technology for separation, treatment and processing of wastewater, applied in heating water/sewage treatment, multi-stage water/sewage treatment, extraction water/sewage treatment, etc. Achieving the effect of good treatment effect and cost reduction

Inactive Publication Date: 2012-09-19
SOUTH CHINA UNIV OF TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this patent, the pH value of the wastewater needs to be lowered first and then increased. During the process, sulfuric acid and sodium hydroxide are added twice, and desulfurizer and flocculant are also added. What is obtained is sodium phenolate. The treatment process is unreasonable. The cost is high, the extraction ratio is high, and the extraction agent used is also limited

Method used

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  • Separation treatment method for waste water in coal tar machining process
  • Separation treatment method for waste water in coal tar machining process

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] like figure 1 As shown, first drain the centrifuge through the oil separation tank to separate free oil, then enter the low-concentration drainage tank to mix with low-concentration wastewater, and add dielectric to it according to the amount of 500ml 10% (wt.) polyaluminum chloride per ton of wastewater Coagulant-like coagulant for demulsification, sent to oil-water separator to remove oil, and then enters waste water mixing tank to mix with distillation and drainage water. The mixed waste water is filtered to further remove oily substances, and enters settling tank to settle to remove sediment to obtain oil-removing waste water, of which Mainly containing 0.4% ammonia, 0.8% total phenols, 0.2% sulfide total phenols and other organic matter, COD is 40000 mg L -1 ;

[0029] The above degreasing wastewater enters the sewage stripping tower, the temperature of the tower kettle is 140°C, the pressure of the tower kettle is 0.45MPa, the temperature of the tower top is 40°C...

Embodiment 2

[0034] First, drain the centrifuge and separate the free oil through the oil separation tank, then enter the low-concentration drainage tank to mix with low-concentration wastewater, and add a dielectric coagulant to it according to the amount of 500ml 10% (wt.) polyaluminum sulfate per ton of wastewater. Demulsification, send oil to water separator to remove oil, and then enter waste water mixing tank to mix with distillation and drainage water. The mixed waste water is filtered to further remove oily substances, and then enters sedimentation tank to settle to remove sediment to obtain degreasing waste water, which mainly contains 0.4% Ammonia, 0.8% total phenol, 0.2% sulfide total phenol and other organic matter, COD is 40000 mg·L -1 ;

[0035] The above degreasing wastewater enters the sewage stripping tower, the temperature of the tower kettle is 165°C, the pressure of the tower kettle is 0.65MPa, the temperature of the tower top is 80°C, the pressure of the tower top is 0...

Embodiment 3

[0040] First drain the centrifuge and separate the free oil through the oil separation tank, then enter the low-concentration drainage tank to mix with low-concentration wastewater, and add a dielectric coagulant to it according to the amount of 500ml 10% (wt.) polyaluminum chloride per ton of wastewater Carry out demulsification, send the oil-water separator to remove oil, and then enter the waste water mixing tank to mix with distillation and drainage water. The mixed waste water is filtered to further remove oily substances, and enter the settling tank to settle to remove sediment to obtain oil-removing waste water, which mainly contains 0.4 % ammonia, 0.8% total phenols, 0.2% sulfide total phenols and other organic matter, COD is 40000 mg L -1 ;

[0041] The above deoiled wastewater enters the sewage stripping tower, the temperature of the tower bottom is 155°C, the pressure of the tower bottom is 0.56MPa, the temperature of the tower top is 60°C, the pressure of the tower...

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Abstract

The invention discloses a separation treatment method for waste water in a coal tar machining process. The separation treatment method mainly comprises the following steps of: at first, pre-treating the waste water in the coal tar machining process to remove free oil and emulsified oil, and then entering a waste mixing groove; secondly, further removing oil matter by filtering and entering a subside for removing depositions through settling, so as to obtain oil-removed waste water; removing hydrogen sulfide and amine after the oil-removed waste water enters a sewage steam stripping tower, and extracting after acid-removed and amine-removed waste water enters an extraction tower; recovering crude carbolic acid and an extracting agent after an extract phase enters a phenol tower; separating the extracting agent from water after a residual extract phase enters a water tower; and processing after the water enters a follow-up biochemical system. The separation treatment method provided by the invention firstly removes acid and anime of the waste water, provides a good acid-alkali condition for follow-up solvent extraction and dephenolization, and has no need of adding a great amount of the acid and alkali in a treatment process. Meanwhile, byproducts, such as the crude carbolic acid, the anime, the hydrogen sulfide and the like, can be recovered. The water quality of the treated waste water can meet the water inlet requirements of the normal biochemical treatment.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and relates to a recovery and separation treatment method of coal tar processing wastewater, in particular to a separation treatment method of coal tar processing wastewater. Background technique [0002] Coal tar itself contains various phenolic substances. When processed into various distillate products, a large amount of waste water will be produced, which contains a large amount of organic pollutants such as ammonia, phenol, oil, etc., and the concentration is high and it is difficult to directly degrade. The wastewater generated during coal tar processing mainly includes centrifuge drainage, distillation drainage and low-concentration wastewater produced by the combination of sodium carbonate and sodium sulfate. Among them, the ammonia concentration in the centrifuge drainage and distillation drainage is high, and the centrifuge drainage also contains free oil. Low-concentration wastewater...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/10C02F1/26C02F1/04
Inventor 陈赟钱宇李秀喜章莉娟
Owner SOUTH CHINA UNIV OF TECH
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