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Boron-containing polysilic aluminum ferric sulfate composite flocculant

A composite flocculant, silicic acid and sulfuric acid technology, applied in the direction of flocculation/sedimentation water/sewage treatment, etc., can solve the problems of high effluent COD and low dosage

Inactive Publication Date: 2007-11-28
UNIV OF SCI & TECH BEIJING +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Aiming at the problem of high effluent COD of coking wastewater after biochemical treatment, a new type of flocculant is prepared, so that the flocculation effect of coking wastewater can meet the requirements of national discharge standards under a single operation link with a small dosage

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0015] The molar ratio of boron-containing polymeric aluminum ferric silicate sulfate (PFASSB) is Fe / Si=0.4, Si / (Al+Fe)=0.7, B / Si=0.28. The preparation method of the flocculant is as follows:

[0016] Weigh a certain amount of sodium silicate, add distilled water to make a 2% solution, adjust its PH with sulfuric acid and sodium hydroxide, make the activated PH value 2, polymerize at room temperature for 20 minutes; then add iron sulfate, aluminum sulfate, Sodium tetraborate, stir evenly in a stirrer and let it stand for 1 day after activation to obtain PFASSB flocculant.

Embodiment 2

[0018] The molar ratio of boron-containing polymeric aluminum ferric silicate sulfate (PFASSB) is Fe / Si=0.5, Si / (Al+Fe)=0.8, B / Si=0.3, and the preparation method of the flocculant is as follows:

[0019] Weigh a certain amount of sodium silicate, add distilled water to make a 2.5% solution, adjust its PH with sulfuric acid and sodium hydroxide, make the activation PH value 3, polymerize at room temperature for 30 minutes; then add iron sulfate, aluminum sulfate, Sodium tetraborate, stir evenly in a stirrer and let it stand for 1 day after activation to obtain PFASSB flocculant.

Embodiment 3

[0021] The molar ratio of boron-containing polymeric aluminum ferric silicate sulfate (PFASSB) is Fe / Si=0.6, Si / (Al+Fe)=0.9, B / Si=0.35, and the preparation method of the flocculant is as follows:

[0022] Weigh a certain amount of sodium silicate, add distilled water to make a 3% solution, adjust its PH with sulfuric acid and sodium hydroxide, make the activation PH value 2.5, polymerize at room temperature for 40 minutes; then add iron sulfate, aluminum sulfate, Sodium tetraborate, stir it in a mixer and let it stand for 2 days after activation to obtain PFASSB flocculant.

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Abstract

The present invention is composite flocculant of boron-containing aluminum iron silicosulfate polymer for treating coking waste water, and belongs to the field of environment protecting engineering technology. The boron-containing aluminum iron silicosulfate polymer has the molar ratio Fe / Si of 0.4-0.6, Si / (Al+Fe) of 0.7-0.9, and B / Si of 0.25-0.35. The composite flocculant is compounded through the following steps: compounding 2-3 wt% concentration distilled water solution of sodium silicate, regulating pH value with sulfuric acid and sodium hydroxide to 2-3, and polymerizing at room temperature for 20-40 min; and adding ferric sulfate, aluminum sulfate and sodium tetraborate in certain molar ratio and through stirring, and standing to activate for 1-2 days. Treating waste water with the composite flocculant has low flocculant throwing amount of 9-11 mg / l and no need of regulating the pH value of the waste water, and the treated water has suspended matter less than 70mg / l and COD concentration lower than 150mg / l.

Description

Technical field: [0001] The invention belongs to the field of environmental protection engineering, and relates to a boron-containing polysilicate aluminum iron sulfate composite flocculant, which is particularly suitable for treating coking wastewater. Background technique: [0002] At present, in wastewater treatment, commonly used inorganic polymer flocculants such as polyaluminum chloride (PAC) and polyferric sulfate (PFS) have their own advantages in the flocculation process. However, the use of these agents to treat industrial wastewater containing complex pollutants is not only a large amount, which is not economical and practical, but also the treatment effect is not good, and various indicators of the wastewater are difficult to meet the standards. [0003] In recent years, it has become a hot spot to develop and apply various composite coagulants, such as the research on the treatment effect of polysilicate ferric sulfate coking wastewater. [1] Add PFSS400mg / L directly ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52
Inventor 李素芹周静
Owner UNIV OF SCI & TECH BEIJING
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