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Printing and dyeing wastewater treatment method based on synergistic effect of anion flocculant and cation flocculant

A printing and dyeing wastewater and synergistic technology, which is applied in the direction of flocculation/sedimentation water/sewage treatment, textile industry wastewater treatment, etc.

Inactive Publication Date: 2014-12-03
JIANGXI NORMAL UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] (1) PDMDAAC flocculants in Documents 1, 2, and 3 are all formed by the combination of quaternary ammonium salt cations in its structure and dye anions through ionic bonds The corresponding color lake can produce a certain degree of decolorization effect on printing and dyeing wastewater, but its color lake structure combined by anion and cation bonds will still be partially dissociated in water, so that the space for further improvement of its decolorization effect is limited
[0005] (2) In Documents 2 and 3, polyaluminum chloride and polyferric chloride were used in combination with PDMDAAC flocculant, which further improved its effect on printing and dyeing wastewater. However, whether it is polyaluminum chloride or polyferric chloride, side effects such as hydrolysis or dissociation may occur during use, resulting in the formation of corresponding metal retention in the water, which may cause new water quality. "Secondary Pollution"
[0006] (3) Documents 1, 2, and 3 did not involve the more critical issue of the settling rate of flocculation and sedimentation particles, so it is impossible to judge its practical application Efficiency of action, so the reference value of its relative application performance is limited

Method used

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  • Printing and dyeing wastewater treatment method based on synergistic effect of anion flocculant and cation flocculant
  • Printing and dyeing wastewater treatment method based on synergistic effect of anion flocculant and cation flocculant

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0026] The first step is to use the composite dyeing wastewater provided by textile enterprises [color is reddish brown, COD Cr The value is 950 mg / kg] as the object of decolorization treatment, measure 200 mL and add it to a 250 mL beaker, add hydrophobic dodecyl-containing PDMDAAC modification with an aqueous solution concentration of 10 mg / L~200 mg / L The non-volatile flocculant is S-PDMDAAC [intrinsic viscosity is 3.00 dL / g, and the molar content of hydrophobic structural unit is 2 / 98], after fully stirring for 1 minute, let it stand for 20 minutes to form a large number of tiny flocculation sediment particles;

[0027] The second step is to add high relative molecular weight (about 35 million) sodium polyacrylate (PASS) with a concentration of 1 mg / L~100 mg / L in the aqueous solution to "secondary aggregate" the formed tiny flocculation sediment particles into larger Precipitating particles, shortening their settling time;

[0028] The third step is to measure the absorb...

Embodiment 2

[0033] The first step is to use the composite dyeing wastewater provided by textile enterprises [color is reddish brown, COD Cr The value is 950 mg / kg] as the object of decolorization treatment, measure 200 mL and add it to a 250 mL beaker, add hydrophobic dodecyl-containing PDMDAAC modification with an aqueous solution concentration of 10 mg / L~200 mg / L The permanent flocculant is S-PDMDAAC [intrinsic viscosity is 2.20 dL / g, and the molar content of hydrophobic structural unit is 98 / 2]. After fully stirring for 1 min, let it stand for 20 min to form a large number of tiny flocculation sediment particles;

[0034] The second step is to add high relative molecular weight (about 35 million) sodium polyacrylate (PASS) with a concentration of 1 mg / L~100 mg / L in the aqueous solution to "secondary aggregate" the formed tiny flocculation sediment particles into larger Precipitating particles, shortening their settling time;

[0035] The third step is to measure the absorbance of th...

Embodiment 3

[0041] The first step is to use the composite dyeing wastewater provided by textile enterprises [color is reddish brown, COD Cr The value is 950 mg / kg] as the object of decolorization treatment, measure 200 mL and add it to a 250 mL beaker, add hydrophobic tetradecyl-containing PDMDAAC modification with an aqueous solution concentration of 10 mg / L~200 mg / L The non-toxic flocculant is S-PDMDAAC [intrinsic viscosity is 2.51 dL / g, and the molar content of hydrophobic structural unit is 2 / 98], after fully stirring for 1 minute, let it stand for 20 minutes to form a large number of tiny flocculation sediment particles;

[0042] The second step is to add high relative molecular weight (about 35 million) sodium polyacrylate (PASS) with a concentration of 1 mg / L~100 mg / L in the aqueous solution to "secondary aggregate" the formed tiny flocculation sediment particles into larger Precipitating particles, shortening their settling time;

[0043] The third step is to measure the absorb...

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Abstract

The invention relates to a printing and dyeing wastewater treatment method based on the synergistic effect of an anion flocculant and a cation flocculant. According to the printing and dyeing wastewater treatment method, novel PDMDAAC modified flocculants respectively containing hydrophobic long-chain alkyl groups such as dodecyl, tetradecyl and hexadecyl are selected, the quaternary ammonium salt cation in the structure of the PDMDAAC modified flocculants and an anionic dye can form a lake, the hydrophobic long chain alkyl groups can be used for further preventing the lake from eroding and dissociating by moisture and thus the structure of the lake is stabilized and meanwhile, after the previously added cationic S-PDMDAAC flocculant and the anionic dye form tiny flocculated lake particles, an appropriate amount of anionic sodium polyacrylate PASS is further added to carry out'secondary aggregation' on the formed tiny flocculated lake particles to form larger sedimentated particles and thus the sedimentation time is shorted, the purification effect of the printing and dyeing wastewater can be enhanced and the purification efficiency is improved.

Description

technical field [0001] The invention relates to a treatment method for printing and dyeing wastewater, in particular to a treatment method for printing and dyeing wastewater based on the synergistic effect of anion and cation flocculants. Background technique [0002] The textile industry is a traditional pillar industry of my country's national economy and an important livelihood industry, as well as an industry with obvious international competitive advantages. In order to meet people's needs for different colors of textile fabrics, it is necessary to dye them; but when dyeing, especially when dyeing deep and thick colors, due to the insufficient dyeing rate, some dyes cannot be fixed on the fabric, resulting in raw materials The waste of waste, which in turn led to the production of a large amount of colored wastewater, the chroma COD value is generally 8000 ~ 40000 mg / kg, and the COD value of some concentrated wastewater even exceeds 50000 mg / kg, the discharge of these ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56C02F103/30
Inventor 余义开王涛王炜章子柔徐亮张莹张露
Owner JIANGXI NORMAL UNIV
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