Method for deeply treating and recycling coal gasification wastewater by preposed oxidization combined with microwaves

An oxidation treatment and advanced treatment technology, applied in chemical instruments and methods, water/sewage multi-stage treatment, water/sludge/sewage treatment, etc. , the large amount of waste water from coal-to-gas production, etc.

Active Publication Date: 2014-08-13
CHINA NAT OFFSHORE OIL CORP +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, after the above treatment, the COD, cyanide and ammonia nitrogen indicators in the discharged wastewater are still difficult to meet the standards.
The final effluent COD is about 450mg / L, which is far from meeting the requirements for discharge or reuse, and advanced treatment is required. However, the coal gasification wastewater has a large amount of water, large fluctuations in water quality, and unstable treatment effects. Compared with other advanced treatment technologies, the biological method has advantages It has the advantages of large wastewater treatment volume, wide treatment range, and relatively low operating costs. However, it is extremely difficult to continue to use biochemical treatment because the effluent B / C of traditional coal gasification wastewater treatment is less than 0.1 (usually greater than 0.3 is biochemical).

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  • Method for deeply treating and recycling coal gasification wastewater by preposed oxidization combined with microwaves

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Effect test

Embodiment 1

[0049] The coal-gas wastewater after a certain biochemical process is treated by a method of pre-oxidation combined with microwave advanced treatment and reuse of coal-gas wastewater of the present invention. The COD of the biochemical coal gasification wastewater is 500mg / L, and the pH is 8.01. First, carry out primary acidification reaction treatment, add sulfuric acid to adjust the pH to 3.0, and react for 15 minutes. At this time, the COD of the acidified coal gasification wastewater is 350mg / L; L was catalyzed for 5 minutes, and the pH was 2.9; after primary catalysis, 350 mg / L of hydrogen peroxide was added to the wastewater after the hydrogen peroxide to wastewater ratio of 1:1, and the reaction was 80 minutes, and the pH was 2.9; the wastewater after primary oxidation Carry out flocculation reaction, add sodium hydroxide to adjust the pH of the wastewater to 9, and react for 15 minutes. At this time, the COD of the coal-gas wastewater after flocculation is 210mg / L; En...

Embodiment 2

[0051] The coal-gas wastewater after a certain biochemical process is treated by a method of the present invention which combines pre-oxidation and microwave advanced treatment of coal-gas wastewater and reuses it. The COD of the biochemical coal gasification wastewater is 450mg / L, and the pH is 8.50. First, carry out primary acidification reaction treatment, add sulfuric acid to adjust the pH to 3.3, and react for 15 minutes. At this time, the COD of the coal-gas wastewater after acidification is 320mg / L; L was catalyzed for 5 minutes, and the pH was 3.1; after primary catalysis, 320 mg / L of hydrogen peroxide was added to the wastewater after the hydrogen peroxide to wastewater ratio of 1:1, and the reaction was 80 minutes, and the pH was 3.1; the wastewater after primary oxidation Carry out flocculation reaction, add sodium hydroxide to adjust the pH of the wastewater to 8.5, and react for 10 minutes. At this time, the COD of the coal-gas wastewater after flocculation is 180...

Embodiment 3

[0053] The coal-gas wastewater after a certain biochemical process is treated by a method of the present invention which combines pre-oxidation and microwave advanced treatment of coal-gas wastewater and reuses it. The COD of the biochemical coal gasification wastewater is 550mg / L, and the pH is 8.20. First, carry out primary acidification reaction treatment, add sulfuric acid to adjust the pH to 2.5, and react for 15 minutes. At this time, the COD of the coal-gas wastewater after acidification is 400mg / L; L was catalyzed for 10 minutes, and the pH was 2.4; after primary catalysis, 600 mg / L of hydrogen peroxide was added to the wastewater after the hydrogen peroxide to wastewater ratio of 1.5:1, and the reaction was 100 minutes, and the pH was 2.4; the wastewater after primary oxidation Carry out flocculation reaction, add sodium hydroxide to adjust the pH of the wastewater to 9, and react for 15 minutes. At this time, the COD of the coal-gas wastewater after flocculation is 1...

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Abstract

The invention relates to a method for deeply treating and recycling coal gasification wastewater by preposed oxidization combined with microwaves. The method is characterized by comprising the following steps: acidification, catalyzation, oxidization, microwave treatment, flocculation, precipitation of coal gasification wastewater and the like. The method is characterized by comprising the following specific steps: firstly, pre-oxidizing by using an oxidant; after ring-opening and chain scission of organic matters, carrying out microwave catalytic oxidization; fully combining hydrogen peroxide oxidization and microwave catalytic oxidization to exert the maximum advantage of oxidizing reaction; treating the organic matters which are not appropriately treated in place in two stages; gradually degrading macromolecular organic matters; finally, fully decomposing degradation-resistant organic matters to satisfy the recycling demand of the coal gasification wastewater.

Description

technical field [0001] The invention belongs to the field of wastewater treatment, and relates to a method for advanced oxidation and microwave advanced treatment of coal gasification wastewater and reuse, and the treated effluent reaches the standard of zero discharge. Background technique [0002] The coal-to-gas industry is a water-intensive industry, and the annual national coal-to-gas wastewater discharge is about 285 million tons. Coal-to-gas wastewater is wastewater formed during high-temperature dry distillation of coal, gas purification, and chemical product refining. The water quality varies with the composition of raw coal and the coking process. It is a typical refractory organic wastewater. Its components are complex and highly toxic, and its excessive discharge can pose great harm to humans, aquatic products, and crops. [0003] At present, coal gasification wastewater is generally pretreated first, and then undergoes secondary treatment such as A / O and biolog...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/08
Inventor 霍莹付连超张莹郑贝贝杨勇
Owner CHINA NAT OFFSHORE OIL CORP
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