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

A technology of oxidation treatment and advanced treatment, applied in chemical instruments and methods, multi-stage water/sewage treatment, water/sludge/sewage treatment, etc. big problem

Active Publication Date: 2014-01-08
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).

Method used

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

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Experimental program
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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. COD500mg / L, pH: 8.01 of biochemical coal gasification wastewater. First, carry out primary acidification reaction treatment, add sulfuric acid to adjust pH: 3.0, and react for 15 minutes. At this time, the COD of the coal-gas wastewater after acidification is 350 mg / L; the effluent after primary acidification is added with 50 mg / L of ferrous sulfate Catalyzed reaction, reaction for 5 minutes, pH: 2.9; waste water after primary catalysis was added hydrogen peroxide 350 mg / L according to the ratio of hydrogen peroxide to waste water 1:1, and reacted for 80 minutes, pH: 2.9; waste water after primary oxidation was flocculated Reaction, add sodium hydroxide to adjust the pH of the wastewater: 9, react for 15 minutes, at this time, the COD of the coal gas wastewater after floc...

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. COD450mg / L, pH: 8.50 of biochemical coal gasification wastewater. Firstly, carry out primary acidification reaction treatment, add sulfuric acid to adjust pH: 3.3, and react for 15 minutes. At this time, the COD of coal gasification wastewater after acidification is 320mg / L; the effluent after primary acidification is added with ferrous sulfate 45mg / L Catalyzed reaction, reaction for 5 minutes, pH: 3.1; waste water after primary catalysis was added hydrogen peroxide 320mg / L according to the ratio of hydrogen peroxide to waste water 1:1, reaction for 80 minutes, pH: 3.1; waste water after primary oxidation was flocculated Reaction, add sodium hydroxide to adjust the pH of the wastewater: 8.5, react for 10 minutes, at this time, the COD of the coal-gas wastewater afte...

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. COD550mg / L, pH: 8.20 of biochemical coal gasification wastewater. First, carry out primary acidification reaction treatment, add sulfuric acid to adjust pH: 2.5, and react for 15 minutes. At this time, the COD of the coal-gas wastewater after acidification is 400mg / L; the effluent after primary acidification is added with 50mg / L of ferrous sulfate Catalyzed reaction, reaction for 10 minutes, pH: 2.4; waste water after primary catalysis was added hydrogen peroxide 600 mg / L according to the ratio of hydrogen peroxide to waste water 1.5:1, and reaction for 100 minutes, pH: 2.4; waste water after primary oxidation was flocculated Reaction, add sodium hydroxide to adjust the pH of the wastewater: 9, react for 15 minutes, at this time, the COD of the coal-gas wastewater a...

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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 Applications(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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