Protein flocculant for treating printing and dyeing wastewater

A printing and dyeing wastewater and protein technology, which is applied in the field of polymer chemicals and its application, can solve the problems of less protein research, increased environmental burden, and underutilization, etc., to achieve increased environmental burden, reduced secondary pollution, and low cost. Effect

Inactive Publication Date: 2011-07-06
中国中化股份有限公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The by-products of animal husbandry or agricultural product processing, such as animal hair, feathers, hoof shells or soybean meal, are rich in protein, but they are not fully utilized at present and are disposed of in large quantities, which not only increases the environmental burden but also wastes resources
Although people have begun to devote themselves to the research and development of protein applications, such as extracting keratin or amino acids from animal hair, etc., which are mainly used in food, feed, cosmetics, medical care, packaging materials, etc., the application is not widespread
However, there are few studies on the decolorization and flocculation of protein in printing and dyeing wastewater.
The first issue of "Printing and Dyeing Auxiliaries" in 2008 "Research on the Decolorization of Modified Chicken Feather Keratin Decolorant K-D Used in Printing and Dyeing Wastewater" is limited to the physical modification of chicken feather keratin, the dosage is large and the decolorization is poor
So far, there is no report that chemically modified protein flocculants can be used to treat dye wastewater

Method used

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  • Protein flocculant for treating printing and dyeing wastewater
  • Protein flocculant for treating printing and dyeing wastewater
  • Protein flocculant for treating printing and dyeing wastewater

Examples

Experimental program
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Effect test

Synthetic example

[0040] The raw material for preparing water-soluble protein in the synthesis example is commercially available animal protein powder with a protein content of 80%. The water-soluble protein is prepared by alkaline hydrolysis, and the preparation method is as follows:

[0041] Add 1 part by weight of animal protein powder, 3.3 parts by weight of deionized water and 0.1 part by weight of ammonia water (weight concentration 20%) into the autoclave. The temperature was raised slowly under stirring, and the temperature rose to 140° C. in about 1 hour. Keep this temperature to carry out the hydrolysis reaction for 2 hours, and the reaction ends. Cool down and filter and wash the filter residue, combine the filtrate and washing liquid to obtain a hydrolyzed protein solution. The filter residue was weighed after drying, and the protein hydrolysis rate was calculated according to the following formula:

[0042] Hydrolysis rate (%) = [(m 0 -m 1 ) / (80%*m 0 )]*100%

[0043] In the ...

Embodiment 1

[0046] Add 100 grams of hydrolyzed protein solution into a four-necked glass reaction flask with a stirrer and a thermometer, start stirring and add 30 grams (0.37 moles) of formaldehyde solution (37% content), 23 grams (0.38 moles) of urea, and an aqueous solution of sodium carbonate to adjust the reaction System pH≈9. The temperature was raised to 60° C., and the reaction was kept for 5 hours. Sampling analysis After the formaldehyde reaction is complete, the material is cooled and discharged to obtain a yellow viscous liquid.

Embodiment 2

[0048] The reaction device is the same as above. Add 150 grams of hydrolyzed protein solution, 8.4 grams (0.1 mole) of dicyandiamide, and 8.1 grams (0.1 mole) of 37% formaldehyde solution. First use sodium carbonate aqueous solution to adjust pH ≈ 9, and react at 60°C; after 3 hours, use hydrochloric acid to adjust pH = 4-5, continue to react for 4 hours, and analyze until all formaldehyde reacts, then cool and discharge to obtain a yellow viscous liquid .

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Abstract

The invention discloses a protein flocculant for treating printing and dyeing wastewater. The protein flocculant for treating the printing and dyeing wastewater is prepared from various animal protein powders originating from cheap waste animal pelts, hoofs, animal fur powders and bean pulps aiming at different groups in a protein molecule and a chemical modifier for reaction. The invention simultaneously provides a protein flocculant compound. The invention provides a simple and practicable method; and by utilizing the method, various dye waste waters discharged in printing and dyeing plants and dye production plants can be effectively treated, and the product cost is cheap.

Description

technical field [0001] The invention belongs to the field of macromolecular chemicals and applications thereof, and in particular relates to a protein flocculant for treating printing and dyeing wastewater. Background technique [0002] Printing and dyeing wastewater has complex components, large discharge volume, and serious environmental pollution. How to effectively treat printing and dyeing wastewater is an important issue related to industrial development. The most difficult to treat in printing and dyeing wastewater is the -SO 3 The dye wastewater with hydrophilic groups such as H, -COOH, -OH, etc., its structure is mainly aromatic hydrocarbons and heterocyclic compounds, which are highly toxic, high in chroma, and difficult to biodegrade and decolorize. At present, the methods used to treat printing and dyeing wastewater include oxidation, flocculation and biological treatment. The cost is high and the effect is poor when treated by oxidation. The agents used in fl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/56
Inventor 刘冬雪鲁琴吴玉春贾俊付洪娥姚齐
Owner 中国中化股份有限公司
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