Comprehensive treatment method for coal-to-ethylene wastewater

A comprehensive treatment and sewage technology, applied in the direction of water/sewage multi-stage treatment, water/sludge/sewage treatment, chemical instruments and methods, etc., can solve the unfeasible problems of coal chemical sewage, reduce the scale of treatment and reduce investment , Improve the effect of processing efficiency

Active Publication Date: 2018-09-21
CHINA PETROLEUM & CHEM CORP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0008] The intermittent SBR process adopted in this patent to realize short-cut nitrification and denitrification is feasible for treating small-flow landfill leachate, but it is not feasible for treating large-volume coal chemical sewage

Method used

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  • Comprehensive treatment method for coal-to-ethylene wastewater

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Effect test

Embodiment 1

[0061] Taking a 600,000-ton / a coal-to-ethylene plant as an example, the gas production capacity of its coal gasification unit is 500,000 m 3 / h coal gasification unit as an example, assuming that there is no water loss during the washing process, the desalinated water volume of the washing tower is 500m 3 / h, the sewage discharge is 500m 3 / h. In the discharged sewage, the conductivity is 3500μS / cm, the total hardness is 900mg / L, the COD is 500mg / L, and the ammonia nitrogen is 300mg / L. The displacement of MTO section is 60m 3 / h, COD400mg / L. Since the MTO sewage contains oil, electro-adsorption treatment cannot be carried out, only biochemical treatment can be carried out.

[0062] The first step is flocculation and sedimentation. to 500m 3 Add 1.5ppm polyacrylamide to the sewage of the coal gasification section per hour, fully mix and react with suspended solids such as fly ash in the sewage through the pipeline mixer, and then enter the sedimentation tank through the d...

Embodiment 2

[0076] Taking a 600,000-ton / a coal-to-ethylene plant as an example, the gas production capacity of its coal gasification unit is 500,000 m 3 / h coal gasification unit as an example, assuming that there is no water loss during the washing process, the desalinated water volume of the washing tower is 500m 3 / h, the sewage discharge is 500m 3 / h. In the discharged sewage, the conductivity is 3500μS / cm, the total hardness is 900mg / L, the COD is 500mg / L, and the ammonia nitrogen is 300mg / L. The displacement of MTO section is 60m 3 / h, COD400mg / L. Since the MTO sewage contains oil, electro-adsorption treatment cannot be carried out, only biochemical treatment can be carried out.

[0077] The first step is flocculation and sedimentation. to 500m 3 Add 2ppm polyacrylamide to the sewage of the coal gasification section per hour, fully mix and react with suspended solids such as fly ash in the sewage through the pipeline mixer, and then enter the sedimentation tank through the div...

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Abstract

The invention belongs to the field of sewage treatment and relates to a method for comprehensive treatment on sewage produced through preparation of ethene from coal. The method comprises adding polyacrylamide into coal gasification section sewage, carrying out flocculation deposition, carrying out cartridge filtration through a filter, carrying out electro-adsorption desalination, mixing the electro-adsorbed concentrated water and MTO sewage mixed water, carrying out shortcut nitrification-denitrification treatment, carrying out nitrogen blowing to remove oxygen, carrying out anaerobic ammonia oxidation, carrying out sludge-water separation and carrying out carbonization and nitration. The method has a low operation cost. The treated product water has low COD content and does not contain ammonia nitrogen and nitrite ions. The method does not produce secondary pollution in the whole process.

Description

technical field [0001] The invention belongs to the field of sewage treatment, and in particular relates to a comprehensive treatment method for coal-to-ethylene sewage. Background technique [0002] Coal-to-ethylene is an important branch of coal chemical industry. Coal-water slurry pressurized gasification technology is used to prepare crude synthesis gas. After partial sulfur-resistant conversion and low-temperature methanol washing and purification, refined synthesis gas that meets the requirements of methanol synthesis is obtained, and then passed through methanol synthesis unit. Crude methanol was obtained. The crude methanol goes through a stabilizing tower to remove light components and dissolved gases to obtain MTO-grade methanol. When necessary, the crude methanol can be rectified to obtain refined methanol products. MTO-grade methanol goes through a methanol-to-olefins unit to produce ethylene and propylene, which are then polymerized to produce synthetic polyeth...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/14
Inventor 潘咸峰邹宗海李波黄斌王建娜
Owner CHINA PETROLEUM & CHEM CORP
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