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Sodium alginate extraction method from reactive dye printing waste water

A technology for sodium alginate and printing wastewater, which is applied in the field of extracting sodium alginate, can solve the problems of increasing the burden of printing wastewater treatment, achieve significant social benefits, reduce the burden, and realize the effects of recycling

Inactive Publication Date: 2009-03-11
WUHAN TEXTILE UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The presence of these sodium alginates greatly increases the burden of printing wastewater treatment

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0021] Take 100 milliliters of spare water (the spare water comes from reactive dye printing sewage with sodium alginate as paste in a printing factory), adjust the pH value to 1 or 2 with dilute hydrochloric acid with a concentration of 5% or 10%, and produce sediment. The solution is filtered, and the filtrate is treated according to conventional sewage treatment methods. Rinse the filtered solid with a small amount of water, and filter off the washing water. While stirring, add the washed solid matter into 100 ml of sodium hypochlorite solution with 1% or 2% available chlorine content and 2% or 5% sodium carbonate solution, adjust the pH value of the solution to 7.5, and continue stirring for 30 minutes . A certain amount of 90, 92% ethanol solution was added to the solution, and a white precipitate was precipitated; after filtering and drying, 0.25 g of sodium alginate was obtained.

Embodiment 2

[0023] Take 100 milliliters of spare water (the spare water comes from a printing factory with sodium alginate as paste for reactive dye printing wastewater), add 5% dilute hydrochloric acid to adjust the pH to 6 or 7, and then add a certain amount of 10% chlorine Calcium solution, resulting in precipitates. The solution is filtered, and the filtrate is treated according to the conventional sewage treatment method, and the filtered solid is rinsed with a small amount of water, and the washing water is filtered off; then the washed solid is added to 100 ml of water, and the concentration is 10% dilute 20 ml of hydrochloric acid, treat for 20, 30 or 50 minutes, then filter the solution, filter out the solid matter, rinse with a small amount of water again, filter out the washing water, and add the washed solid matter to the available chlorine content of 2% or 3% while stirring. % sodium hypochlorite solution and 5% or 10% sodium carbonate solution to adjust the pH of the solutio...

Embodiment 3

[0025] Take 100 milliliters of spare water (the spare water comes from the reactive dye printing sewage with sodium alginate as paste in a printing factory), add dilute hydrochloric acid with a concentration of 2% to adjust the pH to 6 or 7, and then add a certain amount of chlorine with a concentration of 10%. Calcium solution, resulting in precipitates. The solution is filtered, and the filtrate is treated according to the conventional sewage treatment method. Rinse the filtered solid with a small amount of water, and filter off the washing water. The washed solids are then added to 100 milliliters of 10%, 15% or 20% sodium chloride solution to form a brown flocculent gel. After filtration and drying, 0.23 g of sodium alginate was obtained.

[0026] The sodium alginate recovered in the present invention can be reused to configure printing paste.

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Abstract

The invention discloses a method for extracting sodium alginate from printing wastewater of a reactive dye, which is characterized in that the method comprises the following steps: wastewater to be utilized is subjected to fine filtration to obtain a spare water body; a dilute hydrochloric acid is added in the spare water body, and the pH value is adjusted to be between 1 and 7; in the step, the spare water body directly produces a precipitate after the dilute hydrochloric acid is added, or the spare water body produces the precipitate when calcium chloride is added after the dilute hydrochloric acid is added; and the further related treatment is performed to the obtained precipitate to obtain solid sodium alginate. The method for extracting the sodium alginate from the printing wastewater of the reactive dye can recover the sodium alginate from the printing wastewater, effectively reduce the burden of sewage treatment of enterprises, can also better realize the cyclic utilization of resources, and has remarkable social benefit, ecological benefit and economical benefit.

Description

technical field [0001] The invention relates to a method for extracting sodium alginate from reactive dye printing wastewater. Background technique [0002] Textile printing requires paste as a carrier. Commonly used pastes include starch, modified starch, carboxymethyl cellulose, sodium alginate, etc. Sodium alginate is the main printing paste, especially the reactive dye printing of cotton fabrics. The role of the printing paste is to carry the dye as a carrier for transfer to the fabric, and it cannot be combined with the dye and washed off easily. In the chemical structure of sodium alginate, the hydroxyl groups contained are all sub-hydroxyl groups, and the binding ability to dyes is very low. In addition, sodium alginate is anionic and has a repulsive effect on anionic reactive dyes. Therefore, it is basically impossible to bond with reactive dyes, so it is a more suitable paste for reactive dyes. [0003] Cotton fabric reactive dye printing accounts for a large p...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C08B37/04
Inventor 朱平隋淑英张传杰张健
Owner WUHAN TEXTILE UNIV
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