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Method for harmlessly treating high-salt wastewater by using fly ash as additive

A technology for harmless treatment of high-salt wastewater, applied in combustion methods, incinerators, lighting and heating equipment, etc. Effect

Inactive Publication Date: 2018-09-25
泫龙(北京)环保科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, fly ash is mainly used in construction, building materials, water conservancy, etc., and the utilization level is low

Method used

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  • Method for harmlessly treating high-salt wastewater by using fly ash as additive

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0018] Put 800 Kg of high-salt wastewater (COD content 9000 mg / L) in the chemical fertilizer industry in an electric furnace, and after heating up to 1350 °C with the electric furnace at 15 °C / min, insert the spray gun into the molten pool to blow oxygen, and the pressure of the oxygen blowing is 1.3 MPa , carry out the oxygen-enriched combustion of organic matter in waste salt, and add 2.2 times of fly ash into the molten pool. X and SO X The flue gas of toxic substances such as flue gas is purified and discharged into the atmosphere. After the melting and combustion treatment, the COD content of the product salt is 30mg / L, and the content of sodium silicate and sodium aluminate exceeds 95%, and the heavy metal elements are basically not leached. At the same time The harmless and resourceful utilization of high-salt wastewater and fly ash has been realized.

Embodiment 2

[0020] Put 700 Kg of high-salt wastewater (COD content 7000 mg / L) in the pesticide industry in an electric furnace, and after heating up to 1400 °C with the electric furnace at 10 °C / min, insert the spray gun into the molten pool to blow oxygen, and the oxygen blowing pressure is 1.5 MPa , carry out the oxygen-enriched combustion of organic matter in the waste salt, and add 1.2 times of fly ash into the molten pool. X and SO X The flue gas of toxic substances such as flue gas is purified and discharged into the atmosphere. After the melting and combustion treatment, the COD content of the product salt is 15mg / L, and the content of sodium silicate and sodium aluminate exceeds 95%, and the heavy metal elements are basically not leached. The harmless and resourceful utilization of high-salt wastewater and fly ash has been realized.

Embodiment 3

[0022] Put 500 Kg of high-salt wastewater (COD content 12,000 mg / L) in the chemical fertilizer industry into an electric furnace, and after heating up to 1050°C with the electric furnace at 10°C / min, insert the spray gun into the molten pool to blow in oxygen, and the oxygen blowing pressure is 3.5 MPa , carry out oxygen-enriched combustion of organic matter in waste salt, and add 3.5 times of fly ash into the molten pool. X and SO X The flue gas of toxic substances such as flue gas is purified and discharged into the atmosphere. After the melting and combustion treatment, the COD content of the product salt is 50mg / L, and the content of potassium silicate and potassium aluminate exceeds 95%, and the heavy metal elements are basically not leached. The harmless and resourceful utilization of high-salt wastewater and fly ash has been realized.

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Abstract

The invention relates to a method for harmlessly treating high-salt wastewater by using fly ash as an additive, and belongs to the field of harmless treatment of dangerous waste and environment protection and the industries of coal chemical industries, fertilizer industries, agricultural chemicals industries and pharmaceutical industries. The invention provides a novel approach of harmlessly treating the high-salt wastewater by using the fly ash as the additive. The high-salt wastewater is placed in an electric stove to heat materials, a certain amount of the fly ash is added to the materialsafter the materials are in a melted state, oxidation gas is added to a melting pool through a jetting gun to perform oxygen enriched combustion of organic pollutants and the like to achieve oriented conversion of sodium salt and potassium salt in harmlessly treated organic pollutants and the like in the high-salt waste water, and purifying processing is conducted on generated fumes enriched with harmful substances such as HCL, NOX, SOX and the like to finally achieve the harmless treatment of the high-salt wastewater of the coal chemical industries, the fertilizer industries, the agriculturalchemicals industries and the pharmaceutical industries. The process of the method is simple to operate and has better industrial application prospect.

Description

[0001] A method for harmlessly treating high-salt wastewater by using fly ash as an additive. technical field [0002] The invention relates to a method for harmlessly treating high-salt wastewater by using fly ash as an additive, belonging to the field of harmless treatment of hazardous waste and environmental protection. The industries it belongs to are coal chemical industry, chemical fertilizer industry, pesticide industry and pharmaceutical industry. Background technique [0003] Usually hypersaline wastewater refers to wastewater containing organic matter and at least a mass fraction of total dissolved solids (TDS) greater than 3.5%. Because in this type of wastewater, in addition to organic pollutants, it also contains a large amount of soluble inorganic salts, such as Cl - 、Na + , SO 4 2- , Ca 2+ etc. This kind of wastewater is generally the limit of biochemical treatment. At present, the treatment methods of high-salt wastewater mainly include biochemical trea...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): F23G7/04
CPCF23G7/04F23G2202/20F23G2209/101Y02E20/34
Inventor 朱海涛
Owner 泫龙(北京)环保科技有限公司
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