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Textile printing and dyeing wastewater decolorizing flocculant and preparation method thereof

A decolorizing flocculant, textile printing and dyeing technology, applied in textile industry wastewater treatment, chemical instruments and methods, flocculation/sedimentation water/sewage treatment, etc., can solve problems such as difficulty in meeting environmental protection requirements, high monomer toxicity, and poor stability. To achieve the effect of strong adaptability of raw water, large molecular weight and fast sedimentation speed

Inactive Publication Date: 2020-03-24
安徽子延科技有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used organic polymer flocculants include polyacrylamide, acrylic acid-maleic anhydride copolymer, dicyandiamide-formaldehyde polymer, etc., which can neutralize the negative charge in the dye molecule to destabilize it, and form flocs to precipitate from water Separation, dicyandiamide-formaldehyde polymer is a high-efficiency organic polymer decolorization flocculant, but the disadvantages of the product such as whitening and stickiness at low temperature and poor stability limit its application, and the residual monomer is highly toxic, which makes it difficult to meet environmental protection requirements

Method used

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  • Textile printing and dyeing wastewater decolorizing flocculant and preparation method thereof

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0030] A preparation method of textile printing and dyeing wastewater decolorization flocculant, specifically as follows:

[0031] Add ferrous sulfate, potassium aluminum sulfate, magnesium sulfate, and calcium chloride to deionized water in turn, and stir to form a homogeneous solution. The molar mass ratio of ferrous sulfate, potassium aluminum sulfate, magnesium sulfate, and calcium chloride is 5:2: 1:1, use citric acid to adjust the pH of the system to 4-5, then add the above organic components, grafted modified chitosan, modified zeolite powder, polyacrylamide, stir at 700r / min for 1.5h, drop Hydrogen peroxide, so that the generated Fe 3+ with the remaining Fe 2+ The molar mass ratio is 1:1, and it can be sealed and cooked for 24 hours.

[0032] The organic components were prepared as follows:

[0033] Mix dicyandiamine, 25% formaldehyde aqueous solution and ammonium chloride in an ice bath under nitrogen protection. The molar mass ratio of dicyandiamine to melamine is...

Embodiment 2

[0039] A preparation method of textile printing and dyeing wastewater decolorization flocculant, specifically as follows:

[0040] Add ferrous sulfate, aluminum potassium sulfate, magnesium sulfate, and calcium chloride to deionized water in turn, and stir to form a homogeneous solution. The molar mass ratio of ferrous sulfate, aluminum potassium sulfate, magnesium sulfate, and calcium chloride is 6:1: 1:1, use citric acid to adjust the pH of the system to 4-5, then add the above organic components, grafted modified chitosan, modified zeolite powder, polyacrylamide, stir at 600r / min for 2h, drop over Oxidation of hydrogen, resulting in Fe 3+ with the remaining Fe 2+ The molar mass ratio is 1:1, and it can be sealed and cooked for 20 hours.

[0041] The organic components were prepared as follows:

[0042] Mix dicyandiamine, 20% formaldehyde aqueous solution and ammonium chloride in an ice bath under nitrogen protection. The molar mass ratio of dicyandiamine to melamine is 6...

Embodiment 3

[0048] A preparation method of textile printing and dyeing wastewater decolorization flocculant, specifically as follows:

[0049] Add ferrous sulfate, aluminum potassium sulfate, magnesium sulfate, and calcium chloride to deionized water in turn, and stir to form a homogeneous solution. The molar mass ratio of ferrous sulfate, aluminum potassium sulfate, magnesium sulfate, and calcium chloride is 4:3: 1:1, use citric acid to adjust the pH of the system to 4-5, then add the above organic components, grafted modified chitosan, modified zeolite powder, polyacrylamide, stir at 800r / min for 1h, drop over Oxidation of hydrogen, resulting in Fe 3+ with the remaining Fe 2+ The molar mass ratio is 1:1, and it can be sealed and cooked for 25 hours.

[0050] The organic components were prepared as follows:

[0051] Mix dicyandiamine, 25% formaldehyde aqueous solution and ammonium chloride in an ice bath under nitrogen protection. The molar mass ratio of dicyandiamine to melamine is 6...

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Abstract

Relating to the technical field of sewage treatment, the invention provides a textile printing and dyeing wastewater decolorizing flocculant and a preparation method thereof. The preparation method ofthe decolorizing flocculant includes: sequentially adding a plurality of inorganic components into deionized water; performing stirring to form a homogeneous solution, adjusting the pH value of the system by citric acid, then adding an organic component, graft modified chitosan, modified zeolite powder and polyacrylamide, performing stirring for a period of time, then adding hydrogen peroxide dropwise, and conducting standing sealing curing. The decolorizing flocculant disclosed by the invention has good adsorption decolorizing performance on different reactive dyes, has a decolorizing rate up to 90% or above, and can be used for decolorizing treatment on textile printing and dyeing wastewater.

Description

technical field [0001] The invention relates to the technical field of sewage treatment, in particular to a decolorizing flocculant for textile printing and dyeing wastewater and a preparation method thereof. Background technique [0002] The textile printing and dyeing industry is a large discharge of industrial wastewater. The discharged wastewater is characterized by deep color, high chemical oxygen demand (COD), poor biodegradability, and large discharge. The main difficulty in treating this type of wastewater is decolorization. Currently, the commonly used flocculation The decolorization effect of water-soluble dyes such as reactive dyes, acidic fuels and direct fuels is poor, and it is difficult to meet the actual environmental treatment requirements. [0003] There are many kinds of wastewater decolorization methods commonly used, such as biological method, flocculation sedimentation method, oxidation method, etc. Among them, flocculation sedimentation method has the ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/52C02F1/56C02F103/30
CPCC02F1/5236C02F1/56C02F2103/30
Inventor 黄彦子
Owner 安徽子延科技有限公司
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