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A system and method for zero-discharge treatment of coal chemical wastewater with electrolytic oxidation and salt separation and crystallization

A technology of electrolytic oxidation and coal chemical industry, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc., can solve problems such as difficult to obtain industrial-grade crystallization and salt separation, and save Manual inspection link, the effect of close connection

Active Publication Date: 2022-05-24
中海油山西能源投资有限责任公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In the practice of coal gasification wastewater zero-discharge treatment projects that have been put into operation, the biochemical treatment, reuse treatment, and membrane concentration processes of gasification wastewater are relatively mature and stable, but the evaporation and crystallization products at the end can basically only be miscellaneous salts, which are difficult to produce. Obtain industrial-grade crystallization and salt separation, and there are many problems in the operation process

Method used

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  • A system and method for zero-discharge treatment of coal chemical wastewater with electrolytic oxidation and salt separation and crystallization
  • A system and method for zero-discharge treatment of coal chemical wastewater with electrolytic oxidation and salt separation and crystallization
  • A system and method for zero-discharge treatment of coal chemical wastewater with electrolytic oxidation and salt separation and crystallization

Examples

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Effect test

Embodiment 1

[0070] The treatment system provided by the specific embodiment is used to carry out zero-discharge treatment of coal chemical sewage, and the method includes:

[0071] (I) Coal chemical wastewater passes through the reuse unit and the pre-concentration device in turn to obtain reverse osmosis concentrate;

[0072] (II) The reverse osmosis concentrated water is oxidized by an electrolytic oxidation device to obtain electrolytic oxidation product water;

[0073] (III) After the electrolytic oxidation product water is discharged, it passes through the nanofiltration device and the nanofiltration product water reverse osmosis device in turn to obtain concentrated water that can be used for salt separation and crystallization. Among them, the electrolytic oxidation product water is subjected to nanofiltration to obtain nanofiltration concentrated water and nanofiltration product water, the nanofiltration concentrated water is subjected to thermal freezing and crystallization to pr...

Embodiment 2

[0077] The difference between this example and Example 1 is that the electrolysis time of the electrolytic oxidation device in step (II) is 2h, the electrolysis current is 703A, and the remaining steps are the same as those of Example 1.

[0078] Measured COD in electrolytic oxidation product water Cr Content and NH 3 -N content is shown in Table 1.

Embodiment 3

[0080] The difference between this example and Example 1 is that the electrolysis time of the electrolytic oxidation device in step (II) is 4h, the electrolysis current is 600A, and the remaining steps are the same as those in Example 1.

[0081] Measured COD in electrolytic oxidation product water Cr Content and NH 3 -N content is shown in Table 1.

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Abstract

The invention provides a system and method for zero-discharge treatment of coal chemical industry sewage with electrolytic oxidation and salt separation and crystallization. The system includes a sequentially connected recycling unit and a membrane concentration unit; wherein, the membrane concentration unit includes sequential A pre-concentration device, an electrolytic oxidation device, a nanofiltration device and a nanofiltration product water reverse osmosis device are connected secondaryly; the electrolytic oxidation device includes an electrode with a working voltage of 4.3V. On the one hand, the present invention installs an electrolytic oxidation device in the middle of the membrane concentration unit, electrolytically oxidizes the concentrated water entering the nanofiltration device of the salt separation crystallization unit, and obtains electrolytic oxidation product water for salt separation by adjusting appropriate electrolytic oxidation working parameters , providing the water quality basis for the subsequent salt division. On the other hand, the present invention provides a whole set of zero discharge system for coal chemical industry sewage, which adjusts each unit in the existing sewage treatment system from the perspective of the whole process for coal chemical sewage with poor water quality, and properly handles each unit. Pollution-like impact factors make the connection between the upstream and downstream units closer.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and relates to a system and method for zero-discharge and salt-separation treatment of sewage, in particular to a system and method for zero-discharge treatment and salt-separation crystallization of coal chemical sewage with electrolytic oxidation. Background technique [0002] In the modern coal gasification process, coal gasification wastewater is one of the most difficult wastewaters to treat. After this kind of wastewater is recovered by phenol and ammonia, it still contains oil, high ammonia nitrogen, high phenol, high COD, complex pollution components, poor biodegradability, biological Features such as high toxicity. [0003] CN103382072A provides a treatment method for coal gasification wastewater, the treatment method comprising sequentially pre-processing and biochemically treating the coal gasification wastewater to be treated, wherein the treatment method further includes performing ad...

Claims

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Application Information

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IPC IPC(8): C02F9/14C02F101/16
Inventor 张文博李耀武刘彦强刘侃许贵彦安文忠李耀智乔英存贾兴国王浩飞汤中文王京立方长传
Owner 中海油山西能源投资有限责任公司
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