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Method for performing decoloration treatment on printing and dyeing wastewater by compounding magnesia powder and aluminum polychlorid

A technology of polyaluminum chloride and magnesium oxide powder, which is applied in textile industry wastewater treatment, chemical instruments and methods, water/sewage multi-stage treatment, etc.

Inactive Publication Date: 2012-09-19
RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The main research on magnesium salt decolorization is based on magnesium chloride and magnesium sulfate, but there are few reports on the use of solid magnesium oxide powder for decolorization of alkaline printing and dyeing wastewater

Method used

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Examples

Experimental program
Comparison scheme
Effect test

example 1

[0013] For printing and dyeing wastewater with a pH of 12 and a concentration of 0.1g / L. When only magnesium oxide powder is added for adsorption, its settling performance is limited. When the dosage is 2.5g / L, the removal rate is about 80%; when the dosage increases to 10g / L, the removal rate reaches 98%. When only polyaluminum chloride is added and the maximum dosage is 350mg / L, the removal rate is only 60%. If the method of the present invention is adopted, after adding 2.5g / L magnesium oxide powder for adsorption and then adding 15mg / L polyaluminum chloride for flocculation, the removal rate can reach 100%.

example 2

[0015] For the printing and dyeing wastewater with a pH of 10 and 13 and a concentration of 0.1g / L, if only 2.5g / L of magnesium oxide powder is added, the removal rates are 50% and 67%, respectively. If the method of the present invention is adopted, 2.5g / L of magnesium oxide powder is added for adsorption and then 15mg / L of polyaluminium chloride is added for flocculation, and the removal rates of dyes with two pHs are 98% and 90% respectively.

example 3

[0017] For printing and dyeing wastewater with a pH of 12 and a concentration range of 0.2-2g / L. If only 2.5g / L magnesium oxide powder is added, the removal rates of printing and dyeing wastewater with a concentration of 0.2 and 0.4g / L are 47% and 10%, respectively, and there is almost no removal effect when the concentration of printing and dyeing wastewater is higher. If the method of the present invention is adopted, after adding 2.5g / L of magnesium oxide powder for adsorption and then adding 15mg / L of polyaluminium chloride for flocculation, the printing and dyeing wastewater with a concentration range of 0.2-2g / L can maintain more than 80% removal effect.

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PUM

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Abstract

The invention relates to a method for performing decoloration treatment on printing and dyeing wastewater by compounding magnesia powder and aluminum polychlorid and belongs to the technical field of wastewater treatment. According to the method, magnesia powder is fed for adsorption, and then aluminum polychlorid is fed for flocculation, and the method is used for treating the printing and dyeing wastewater of which pH value is greater than 10. The synergistic effect of the magnesia powder and the aluminum polychlorid is effectively exerted by compounding the magnesia powder and the aluminum polychlorid, and the method has the advantages of small feeding amount, good decoloration effect, and low treatment cost, and can be directly applied to decoloration treatment of alkaline high-concentration printing and dyeing wastewater.

Description

technical field [0001] The invention relates to a printing and dyeing wastewater treatment method for decolorization by using magnesium oxide powder compounded with polyaluminum chloride. The method first adds magnesium oxide powder for adsorption and then adds polyaluminum chloride for flocculation, and is used for printing and dyeing wastewater with a pH greater than 10. The invention belongs to the technical field of wastewater treatment. Background technique [0002] With the continuous acceleration of the industrialization process, dyes have been more and more widely used in fields such as textiles, printing, leather manufacturing, and food processing. Correspondingly, the quantity and types of printing and dyeing wastewater produced are increasing rapidly, and the pollution of water bodies is also becoming more and more serious, threatening human safety and health. [0003] Due to its process characteristics, printing and dyeing wastewater is usually alkaline wastewa...

Claims

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Application Information

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IPC IPC(8): C02F9/04C02F103/30
Inventor 栾兆坤倪帆彭先佳贾智萍何劲松
Owner RES CENT FOR ECO ENVIRONMENTAL SCI THE CHINESE ACAD OF SCI
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