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Treatment method for coal gasification wastewater containing phenol and ammonia

A technology for coal gasification wastewater and treatment methods, applied in chemical instruments and methods, water/sewage multi-stage treatment, extraction water/sewage treatment, etc., can solve the problems of easy loss of phenol, low extraction efficiency, high pH value, etc., and achieve reduction Subsequent treatment of pollution load, reduction of extraction operation costs, and the effect of reducing energy consumption

Inactive Publication Date: 2011-11-16
ZHONGKAI UNIV OF AGRI & ENG
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] There are outstanding shortcomings in the existing coal gasification wastewater treatment process: 1. The pH value of some devices is too high during extraction, resulting in low extraction efficiency
The above methods all consider removing acid gas and ammonia first, then extracting and removing phenol, and then recovering the extraction solvent. There are problems that a large amount of refrigerant is required for cooling before the above extraction, the extraction temperature is high, and the process of stripping phenol is easy. Disadvantages such as loss, ammonia is easily polluted by phenol, etc.

Method used

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  • Treatment method for coal gasification wastewater containing phenol and ammonia
  • Treatment method for coal gasification wastewater containing phenol and ammonia

Examples

Experimental program
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Effect test

Embodiment 1

[0028] The phenol content of coal gasification sewage unit is 4000mg·L -1 , the content of polyphenols is 2000mg·L -1 , total ammonia 14.21g·L -1 , CO 2 4.18g·L -1 , the pH value is 10.1, the water temperature is 68°C, and the flow rate is 80 tons / hour. The process shown in Figure 1 is used for processing. into CO 2 The flow rate is 2800 kg / h, and the pH value is adjusted to 7.68. The extraction tower is a packed extraction tower, the extraction agent is diisopropyl ether, the extraction temperature is 39°C, and the volume ratio of solvent to sewage is 1:9. The theoretical plate of the sewage stripping tower is 57, the cold and hot feed ratio is 1:4, the temperature at the top of the tower is 45°C, the pressure at the top of the tower is 0.57MPa, the temperature at the bottom of the tower is 156°C, the pressure at the bottom of the tower is 0.61MPa, and the temperature of the side line is 140.0 °C, pressure 0.58MPa. The operating pressure of the first stage partial cond...

Embodiment 2

[0030] The phenol content of coal gasification sewage unit is 4050mg·L -1 , the content of polyphenols is 1800mg·L -1 , total ammonia 13.8g·L -1 , CO 2 4.01g·L -1 , the pH value is 9.8, the water temperature is 69°C, and the flow rate is 60 tons / hour, and the process is processed as shown in Figure 1. into CO 2 The flow rate is 2180 kg / h, and the pH value is adjusted to 7.56. The sewage stripping tower has 55 theoretical plates, the ratio of cold and hot feed is 1:4.0, the temperature at the top of the tower is 44.1°C, the pressure at the top of the tower is 0.57MPa, the temperature at the bottom of the tower is 159.7°C, the pressure at the bottom of the tower is 0.62MPa, and the temperature of the side stream is 149.0°C , pressure 0.49MPa. The operating pressure of the first stage partial condenser is 0.46MPa, the operating temperature is 144°C, the operating pressure of the second stage partial condenser is 0.36MPa, the operating temperature is 85.6°C, and the operatin...

Embodiment 3

[0032] The phenol content of coal gasification sewage unit is 3880mg·L -1 , the content of polyphenols is 1570mg·L -1 , total ammonia 16.4g·L -1 , CO 2 4.3g·L -1 ,, the pH value is 10.8, the water temperature is 68°C, the flow rate is 40 tons / hour, and the process is processed as shown in Figure 1. into CO 2 The flow rate is 1500 kg / h, and the pH value is adjusted to 7.48. Sewage stripper has 55 theoretical plates, the ratio of cold and hot feed is 1:4.0, the temperature at the top of the tower is 46.3°C, the pressure at the top of the tower is 0.55MPa, the temperature at the bottom of the tower is 158.9°C, the pressure at the bottom of the tower is 0.58MPa, and the temperature of the side stream is 143.0°C , pressure 0.47MPa. The operating pressure of the three-stage partial condenser is 0.45MPa, the operating temperature is 142°C, the operating pressure of the second partial condenser is 0.35MPa, the operating temperature is 88.2°C, and the operating pressure of the th...

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Abstract

The invention discloses a treatment method for coal gasification wastewater containing phenol and ammonia, which comprises the following steps: 1, introducing CO2 to regulate the pH value of the waste water; 2, extracting and removing phenol; 3, pressurizing and stripping to remove acidic gases and ammonia; 4, concentrating ammonia; and 5, recovering solvent. In the invention, the drawbacks of stripping phenol loss, pollution of phenol to ammonia product, high extraction temperature and the like of a process in which extraction is performed after stripping by cooling raw material waste water to 30 to 60 DEG C first, absorbing CO2 to regulating the pH value of the waste water to 7 to 8 and advancing a phenol extracting and removing process. Meanwhile, the treatment method has the advantages that: the system can be modified to an optimal extraction environment easily; heating is required once; carbon dioxide can be recovered and recycled; and the like. The coal gasification wastewater purified by the method meets the requirements of subsequent biological treatment completely.

Description

technical field [0001] The invention relates to a method for treating coal gasification wastewater containing phenol and ammonia, in particular to a method for treating coal gasification wastewater by first removing phenol and then removing acid and ammonia. Background technique [0002] In the process of coal coking and coal gasification, a large amount of coal gasification wastewater will be produced. The composition of these wastewaters is complex, and the pollutants include ammonia, carbon dioxide, unit phenols, polyphenols, fatty acids, and a small amount of hydrogen sulfide. Ammonia, phenol and other substances contained in the water quality have high biological toxicity. Therefore, before the wastewater is reused or discharged, it is necessary to remove and recover phenol, ammonia, acid gas and other substances, and perform regeneration treatment and other operations. [0003] The existing coal gasification wastewater treatment process has outstanding shortcomings: 1...

Claims

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Application Information

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IPC IPC(8): C02F9/10C02F1/26
Inventor 冯大春鲁红
Owner ZHONGKAI UNIV OF AGRI & ENG
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