Method for treating coal gasification wastewater

A technology of coal gasification wastewater and treatment methods, applied in the direction of oxidized water/sewage treatment, chemical instruments and methods, multi-stage water/sewage treatment, etc., can solve the problem of pollutants not being removed more effectively, failing to meet environmental protection requirements, organic pollution Complexity and other problems, to achieve the effect of improving biodegradability, short oxidation time, and improving biodegradability

Active Publication Date: 2014-05-07
CHINA PETROLEUM & CHEM CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, this method only achieves a certain treatment effect on COD, ammonia nitrogen, and chroma, and does not effectively remove other pollutants in wastewater, especially for complex organic pollutants in coal gasification wastewater, which are difficult to degrade and have high salt content. Effective solutions can no longer meet the current environmental protection requirements

Method used

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  • Method for treating coal gasification wastewater
  • Method for treating coal gasification wastewater
  • Method for treating coal gasification wastewater

Examples

Experimental program
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Effect test

Embodiment 1

[0032] Adopt the method of the present invention to attach figure 1A combined process flow for the treatment of a certain coal gasification wastewater. The wastewater quality is as follows: pH is 7.3, COD is 961 mg / L, ammonia nitrogen is 141.49 mg / L, Ca2+ is 426.23 mg / L, Mg2+ is 12.52 mg / L, the total salt content is 1525.92 mg / L, and the B / C ratio is : 0.27. The wastewater treatment volume is 1000L, and the main test device configuration, operating conditions and treatment effects of each treatment unit are shown in Table 1.

[0033] Table 1 Main processing unit composition and processing effect of Embodiment 1

[0034]

[0035] The treated effluent water quality: COD is 40mg / L, ammonia nitrogen is 3.91mg / L, Ca 2+ 6.33mg / L, Mg 2+ The total salt content is 0.98mg / L, the total salt content is 25mg / L, and the recovered water volume is 937L.

Embodiment 2

[0037] Adopt the method of the present invention to attach figure 1 A combined process flow for the treatment of a certain coal gasification wastewater. The wastewater quality is as follows: pH is 7.6, COD is 3326mg / L, ammonia nitrogen is 208.19 mg / L, Ca 2+ 369.83mg / L, Mg 2+ The total salt content was 12.14mg / L, the total salt content was 1553.6 mg / L, and the B / C was 0.21.

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Abstract

The invention discloses a method for treating coal gasification wastewater. The method comprises steps of: (1) lime softening by first adding lime milk to the coal gasification wastewater to conduct chemical precipitation on calcium salt and magnesium salt with the lime milk, standing the precipitation and filtering an supernatant; (2) ozone oxidation by sending the wastewater filtered in the step (1) into an ozone oxidation device for treatment; (3) MBBR treatment by sending the wastewater subjected to ozone oxidation into an MBBR for treatment; (4) coarse filtration; (5) continuous membrane filtration or ultrafiltration; (6) reverse osmosis; and (7) multi-effect evaporation by conducting multi-effect evaporation on the concentrate obtained by reverse osmosis treatment, and further crystallizing the concentrate obtained by multi-effect evaporation. The method of the invention can effectively remove the main pollutants such as COD, ammonia nitrogen and chroma in coal gasification wastewater, can also greatly reduce the salt content of the wastewater, ensure the efficient and long-term running of the double membranes, and achieve zero discharge of coal gasification wastewater.

Description

technical field [0001] The invention relates to the field of wastewater treatment, in particular to a treatment method for coal gasification wastewater. Background technique [0002] Coal is the main fossil energy in my country. In recent years, the coal gasification industry has developed rapidly. However, coal gasification is a highly polluting industry with long operation period, complex process, many pollution production links, and most of them are toxic and harmful. Water resources and water environment issues have become the bottleneck restricting the development of the coal gasification industry. Seeking wastewater treatment processes with better treatment effects, stronger process stability, and lower operating costs to achieve the goal of zero discharge of wastewater has become a key issue for the development of the coal gasification industry. urgent demands. The relevant national policies also clearly require the promotion of waste water recycling in key industri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/14C02F1/44C02F1/78
Inventor 许莹李宝忠郭宏山张蕾陈中涛朱卫李建涛
Owner CHINA PETROLEUM & CHEM CORP
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