Method and system for deeply treating coking wastewater to decarbonize, decolor and remove cyanide

A technology for advanced treatment and coking wastewater, which is applied in special compound water treatment, oxidized water/sewage treatment, water/sewage treatment, etc. It can solve the problems of high concentration of effluent pollutants, low efficiency of advanced treatment of coking wastewater, and failure to meet discharge standards and other problems, to achieve the effect of high reaction efficiency, reduced infrastructure investment, and less mud production

Active Publication Date: 2017-05-31
CISDI ENG CO LTD
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In view of the above-mentioned shortcomings of the prior art, the purpose of the present invention is to provide a method and system for advanced treatment of coking wastewater, decarbonization, decolorization and decyanation, which is used to solve the problem of low efficiency of advanced treatment of coking wastewater and effluent pollution in the prior art. High concentration of pollutants, failure to meet emission standards, etc.

Method used

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  • Method and system for deeply treating coking wastewater to decarbonize, decolor and remove cyanide

Examples

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Effect test

Embodiment 1

[0054] First, the coking plant effluent (that is, coking wastewater, selected from the biochemical effluent of a coking plant, COD: 290mg / L, cyanide 10mg / L, chromaticity 600 times) is raised to the Fenton fluidized bed, and ferrous sulfate is added 1500mg / L (in the mixed aqueous solution containing ferrous sulfate, the mass concentration of ferrous sulfate is 25%, the mass concentration of sulfuric acid is 3%, and the balance is water), and carry out according to the ratio that hydrogen peroxide addition is 150mg / L In conversion, add the corresponding amount of hydrogen peroxide to the Fenton fluidized bed, add the mixed aqueous solution containing ferrous sulfate, the pH of the solution is 3.3, and the effective reaction time is 20 minutes; after the Fenton reaction, the effluent enters the flocculation sedimentation tank, and hydrogenation and oxidation Adjust the pH value of the reaction solution to 10 with sodium aqueous solution, add PAM 20mg / L, react for 10 minutes, and ...

Embodiment 2

[0056] The coking wastewater (selected from the biochemical effluent of a coking plant, COD: 240mg / L, cyanide 8.6mg / L, color 550 times) was raised to the Fenton fluidized bed, and ferrous sulfate 1000mg / L (containing sulfuric acid In the mixed aqueous solution of ferrous iron, the mass concentration of ferrous sulfate is 22%, the mass concentration of sulfuric acid is 1.5%, and the balance is water), and convert according to the ratio that the hydrogen peroxide addition is 200mg / L, add the corresponding amount Hydrogen peroxide was added to the Fenton fluidized bed. After adding the mixed aqueous solution containing ferrous sulfate, the pH value of the solution was 4.0, and the effective reaction time was 30 minutes. value to 11, add PAM 15mg / L, reaction time 15 minutes, sedimentation 30 minutes; flocculation precipitation effluent enters the sodium hypochlorite oxidation tank, the mass ratio of sodium hypochlorite dosage to cyanide in wastewater is 30:1 (sodium hypochlorite do...

Embodiment 3

[0058] The coking wastewater (selected from the biochemical effluent of a coking plant, COD: 150mg / L, cyanide 5.9mg / L, color 450 times) was raised to the Fenton fluidized bed, and ferrous sulfate 1300mg / L (containing sulfuric acid In the mixed aqueous solution of ferrous iron, the mass concentration of ferrous sulfate is 24%, the mass concentration of sulfuric acid is 2%, and the balance is water), and convert according to the ratio that the hydrogen peroxide addition is 300mg / L, add corresponding amount Hydrogen peroxide was added to the Fenton fluidized bed. After adding the mixed aqueous solution containing ferrous sulfate, the pH value of the solution was 3.4, and the effective reaction time was 30 minutes. value to 12, add PAM dosage 30mg / L, react for 15 minutes, and settle for 30 minutes; the flocculated sedimentation water enters the sodium hypochlorite reaction tank, and the mass ratio of sodium hypochlorite dosage to cyanide in wastewater is 25:1 (sodium hypochlorite d...

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Abstract

The invention provides a method and system for deeply treating coking wastewater to decarbonize, decolor and remove cyanide. The method comprises the following steps: 1) introducing the coking wastewater into a Fenton fluidized bed, and adding a mixed solution of ferrous sulfate, sulfuric acid and water into a solution; 2) adding hydrogen peroxide into the solution of the Fenton fluidized bed and sufficiently reacting; 3) leading out a reaction solution in the Fenton fluidized bed, adjusting the pH (Potential of Hydrogen) value of the reaction solution, adding a flocculating agent, and after precipitating, taking supernatant; 4) mixing the supernatant with sodium hypochlorite, and carrying out an oxidization reaction; and 5) adjusting the pH of the reaction solution, and carrying out adsorption treatment by active carbon to obtain a deeply treated water body. According to the method and the system, the Fenton fluidized bed, flocculation and sedimentation, sodium hypochlorite oxidization, and active carbon filtering and adsorption are effectively combined; the Fenton fluidized bed and the flocculation and sedimentation are carried out, residual cyanide in output water mainly exists in a CN<-> form, the oxidization efficiency of the sodium hypochlorite is higher, and the cyanide can be removed; and the adsorption effect of the active carbon is combined, so that the water concentration of the output water is lower.

Description

technical field [0001] The invention relates to the field of advanced treatment of refractory wastewater, in particular to a method and system for advanced treatment of coking wastewater for decarburization, decolorization and decyanation. Background technique [0002] Coking wastewater is wastewater produced during the production of coke, gas, tar and coking products by coking plants in the iron and steel industry and city gas plants. It has complex components and heavy color, and contains many organic and inorganic pollutants, cyanide, thiocyanate , phenolic compounds, polycyclic aromatic hydrocarbons (PAHs), nitrogen-containing heterocyclic compounds, oxygen-containing or sulfur-containing heterocyclic compounds, and long-chain aliphatic compounds. [0003] Coking wastewater treatment generally adopts the treatment process of pretreatment→biochemical treatment→advanced treatment. Among them, the pretreatment mainly removes oil, ammonia nitrogen and phenols in the wastewa...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04C02F101/18
CPCC02F1/283C02F1/54C02F1/56C02F1/66C02F1/72C02F1/722C02F9/00C02F2101/18C02F2305/026
Inventor 赵二华姜剑邱利祥袁玉婷严浩
Owner CISDI ENG CO LTD
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