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Method for treating trivalent chromium in printing and dyeing wastewater by utilizing rabbit hair keratin adsorbent

A technology for printing and dyeing wastewater and keratin, which is applied in the direction of adsorption of water/sewage treatment, water/sewage treatment, chemical instruments and methods, etc., can solve problems affecting popularization and application, lack of adsorbents, etc., achieve reasonable design, reduce pollution, The effect of easy operation

Inactive Publication Date: 2014-01-08
KUNSHAN WANFENG GARMENT
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The adsorption method has been developed in recent years and is considered to be one of the best treatment methods. However, the lack of adsorbents with excellent performance and low price has affected its promotion and application.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0012] A method for extracting rabbit hair keratin, comprising the steps of:

[0013] A method for treating trivalent chromium in printing and dyeing wastewater by using a rabbit hair keratin adsorbent, comprising the steps of:

[0014] First, take 1 spare rabbit hair keratin adsorbent and wash it with water until the pH is 7.5;

[0015] Second, put the rabbit hair keratin adsorbent in the previous step in the adsorption tower and mix it with printing and dyeing wastewater. Before the adsorption tower is penetrated, the adsorption time is 3 hours, and the removal rate of trivalent chromium is more than 95.2%. The mass concentration of valent chromium is below 5mg / L, the adsorption tower is penetrated for 6.5 hours, and the adsorption temperature is 30°C;

[0016] The 3rd, desorption treatment, put the rabbit hair keratin adsorbent after adsorption into the sulfuric acid solution of 4.0mol / L, desorption temperature is 90 ℃, desorption time is 5h, filter the rabbit hair keratin...

Embodiment 2

[0018] A method for treating trivalent chromium in printing and dyeing wastewater by using a rabbit hair keratin adsorbent, comprising the steps of:

[0019] First, take 2 spare rabbit hair keratin adsorbents and wash them with water until the pH is 6;

[0020] Second, the rabbit hair keratin adsorbent in the previous step is placed in the adsorption tower and mixed with printing and dyeing wastewater. Before the adsorption tower is penetrated, the adsorption time is 2 hours, and the removal rate of trivalent chromium is over 95.2%. The mass concentration of valent chromium is below 5mg / L, the adsorption tower is penetrated for 6 hours, and the adsorption temperature is 28°C;

[0021] The 3rd, desorption treatment, put the rabbit hair keratin adsorbent after adsorption into the sulfuric acid solution of 3.0mol / L, desorption temperature is 80 ℃, desorption time is 4h, filter the rabbit hair keratin adsorbent after desorption, and then Wash with water until the pH value is 7. ...

Embodiment 3

[0023] A method for treating trivalent chromium in printing and dyeing wastewater by using a rabbit hair keratin adsorbent, comprising the steps of:

[0024] First, take 3 spare rabbit hair keratin adsorbents and wash them with water until the pH is 4.5;

[0025] Second, put the rabbit hair keratin adsorbent in the previous step in the adsorption tower and mix it with the printing and dyeing wastewater. Before the adsorption tower is penetrated, the adsorption time is 1h, and the removal rate of trivalent chromium is over 95.2%. The mass concentration of valent chromium is below 5mg / L, the adsorption tower is penetrated for 5.5 hours, and the adsorption temperature is 25°C;

[0026] The 3rd, desorption treatment, put the rabbit hair keratin adsorbent after the adsorption into the sulfuric acid solution of 1.5mol / L, the desorption temperature is 70 ℃, the desorption time is 3h, filter the rabbit hair keratin adsorbent after desorption, and then Wash with water until the pH val...

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PUM

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Abstract

The invention relates to a method for treating trivalent chromium in printing and dyeing wastewater by utilizing a rabbit hair keratin adsorbent. The method comprises the following steps: firstly, washing 1-3 parts by weight of standby rabbit hair keratin adsorbent with clear water until the pH is 4.5-7.5; secondly, placing and mixing the rabbit hair keratin adsorbent with printing and dyeing wastewater in an adsorption tower at the adsorption temperature of 25-30 DEG C for adsorption time of 1-3 hours; thirdly, placing the adsorbed rabbit hair keratin adsorbent into a 1.5-4.0mol / L sulfuric acid solution for desorbing at the desorbing temperature of 70-90 DEG C for desorbing time of 3-5 hours, then washing with clear water until the pH is up to 6-8. The method has the beneficial effects of pointing out a place for rural excessive rabbit hair and reducing the environmental pollution caused by the rabbit hair; the keratin material in the rabbit hair is modified into an adsorbent, the absorbent is used for treating the trivalent chromium-containing printing and dyeing wastewater, so as to provide a new technology for treating the current printing and dyeing wastewater, and the method has the advantages of being energy-saving, environment-friendly, simple in technology and simple and convenient to operate.

Description

technical field [0001] The invention belongs to the technical field of sewage treatment, and in particular relates to a method for treating trivalent chromium in printing and dyeing wastewater by using a rabbit hair keratin adsorbent. Background technique [0002] my country is a big textile country. At present, the daily discharge of printing and dyeing wastewater has reached 3 to 4 million tons. The printing and dyeing wastewater is not only complex in composition but also high in pollutant concentration. It contains a large amount of inorganic substances and salt. A large amount of trivalent chromium contained in printing and dyeing wastewater has had a serious impact on the ecological environment and human health. How to treat printing and dyeing wastewater and get rid of trivalent chromium has become a research hotspot at home and abroad, and it is also a problem that must be solved for the textile industry to take the road of sustainable development. [0003] At presen...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/28C02F1/62C02F103/30
Inventor 姚建平
Owner KUNSHAN WANFENG GARMENT
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