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A treatment method for printing and dyeing wastewater combining adsorption-flocculation-membrane separation

A technology for printing and dyeing wastewater and a treatment method, which is applied in the field of printing and dyeing wastewater treatment, can solve the problems of easy cracking of ceramic filter membranes, poor mechanical damage resistance, complicated preparation procedures, etc., and achieves convenient post-treatment, reduced treatment costs, and good solubility. Effect

Active Publication Date: 2021-11-05
浙江海印数码科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the preparation process of this method is more complicated, the cycle is long, and the prepared ceramic filter membrane is easier to crack and has poor resistance to mechanical damage.

Method used

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  • A treatment method for printing and dyeing wastewater combining adsorption-flocculation-membrane separation
  • A treatment method for printing and dyeing wastewater combining adsorption-flocculation-membrane separation

Examples

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Effect test

Embodiment 1

[0030] A method for treating printing and dyeing wastewater combined with adsorption-flocculation-membrane separation, comprising the following steps:

[0031] (1) Add 10g of 3-chloro-2-hydroxypropyltrimethylammonium chloride to deionized water to prepare a modified solution, mix 0.008g of chitosan and deionized water and stir at 50°C until the solid dissolves , prepare the chitosan aqueous solution, and mix it with the modified solution evenly, then add ammonia water to adjust the pH of the solution to 10-12, reflux at 100°C for 3 hours, cool to room temperature after the reaction, filter, and dry the solid , to prepare quaternized chitosan;

[0032] (2) Sodium alginate and deionized water are mixed and stirred at 40° C. until the solid dissolves to obtain a sodium alginate solution with a mass concentration of 3%, which is added to a calcium chloride solution with a mass concentration of 5%. The mass ratio of sodium alginate to calcium chloride is 2:0.3, keep stirring and r...

Embodiment 2

[0038] A method for treating printing and dyeing wastewater combined with adsorption-flocculation-membrane separation, comprising the following steps:

[0039] (1) Add 10g of 3-chloro-2-hydroxypropyltrimethylammonium chloride to deionized water to prepare a modified solution, mix 0.015g of chitosan and deionized water and stir at 50°C until the solid dissolves , prepare the chitosan aqueous solution, and mix it with the modified solution evenly, add ammonia water to adjust the pH of the solution to 10-12, reflux at 150°C for 3 hours, cool to room temperature after the reaction, filter, and dry the solid , to prepare quaternized chitosan;

[0040] (2) Sodium alginate and deionized water are mixed and stirred at 40° C. until the solid dissolves to obtain a sodium alginate solution with a mass concentration of 3%, which is added to a calcium chloride solution with a mass concentration of 5%. The mass ratio of sodium alginate to calcium chloride is 2:0.6, keep stirring and reacti...

Embodiment 3

[0046] A method for treating printing and dyeing wastewater combined with adsorption-flocculation-membrane separation, comprising the following steps:

[0047] (1) Add 10g of 3-chloro-2-hydroxypropyltrimethylammonium chloride to deionized water to prepare a modified solution, mix 0.01g of chitosan and deionized water and stir at 50°C until the solid dissolves , prepare the chitosan aqueous solution, and mix it with the modified solution evenly, then add ammonia water to adjust the pH of the solution to 10-12, reflux at 110°C for 3 hours, cool to room temperature after the reaction, filter, and dry the solid , to prepare quaternized chitosan;

[0048] (2) Sodium alginate and deionized water are mixed and stirred at 40° C. until the solid dissolves to obtain a sodium alginate solution with a mass concentration of 3%, which is added to a calcium chloride solution with a mass concentration of 5%. The mass ratio of sodium alginate to calcium chloride is 2:0.4, keep stirring and re...

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Abstract

The invention provides a treatment method of printing and dyeing wastewater combined with adsorption-flocculation-membrane separation, comprising the following steps: firstly prepare quaternized chitosan and sodium alginate microspheres respectively, add the two into deionized water, and then Glutaraldehyde solution was added dropwise for cross-linking reaction to prepare a composite flocculant; the zirconia filter membrane was prepared by sol-gel method, and then it was silanized, and then a layer of yttrium-doped titanium oxide was prepared on its surface. Composite nanofiltration membrane is formed; the printing and dyeing wastewater is firstly treated with activated carbon adsorption, then the prepared composite flocculant is added to the treated wastewater for precipitation treatment, and finally the nanofiltration membrane is used to perform nanofiltration treatment on the supernatant after flocculation treatment. The final wastewater meets the discharge requirements. The method adopts the combined method of adsorption-flocculation-membrane separation to treat the printing and dyeing wastewater, the removal rate of pollutants is high, the pollution of the membrane is small during the treatment process, and the nanofiltration membrane prepared by the invention has excellent mechanical properties.

Description

Technical field: [0001] The invention relates to the field of printing and dyeing wastewater treatment, in particular to a treatment method for printing and dyeing wastewater combining adsorption-flocculation-membrane separation. Background technique: [0002] Due to the increase of population and the rapid development of economy, the water consumption continues to increase, resulting in a serious shortage of water resources. The contradiction between supply and demand of water resources is becoming more and more prominent. The shortage of water resources has become one of the most prominent social problems in all countries in the world. my country's water environment pollution is also becoming more and more serious, and the shortage of water quality-based water resources caused by water pollution is gradually becoming normal. In the field of sewage, industrial wastewater accounts for more than half. Among various industrial industries, the total discharge of printing wastew...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/04C02F103/30
CPCC02F1/283C02F1/442C02F1/5263C02F9/00C02F2103/30
Inventor 宋水友宋丽娜
Owner 浙江海印数码科技有限公司
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