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Processing method used for multiple recycling of fur dyeing effluent

A treatment method, a technology for dyeing waste liquid, applied in water/sewage multi-stage treatment, chemical instruments and methods, water/sludge/sewage treatment, etc., can solve the unbearable operating cost of excess sludge, COD and chroma removal The rate is not high, the effluent can not meet the discharge standard and other problems

Inactive Publication Date: 2014-02-19
ZHEJIANG ZHONGHUI FUR & LEATHER +3
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Commonly used biological treatment methods mainly include activated sludge method and biofilm method. Both activated sludge method and biofilm method have the same problem, that is, the removal rate of COD and chroma is not high, and the effluent treated by the system cannot meet the specified discharge. Standards, and more importantly, the treatment of excess sludge and high operating costs are unaffordable

Method used

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  • Processing method used for multiple recycling of fur dyeing effluent
  • Processing method used for multiple recycling of fur dyeing effluent
  • Processing method used for multiple recycling of fur dyeing effluent

Examples

Experimental program
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Effect test

Embodiment 1

[0025] 1. Dyeing dark brown dyeing wastewater for recycling

[0026] (1) After the new dye solution is dyed dark brown, take 2000 liters of wastewater, pH=3.5-4.0, chroma 2000 times, chromium content 40mg / L. Add 1.6 kg of lime (0.08% of the wastewater volume), adjust the pH=9.0-10.0, add 2.6 liters of dicyandiamide-formaldehyde polymer decolorizer solution with a concentration of 10wt% (0.13% of the wastewater volume), and add a concentration of 0.1 10 liters of wt% flocculant PAM solution (0.5% of the waste water), stir evenly, let it stand for 2 hours, pump it into the plate and frame filter press with a non-blocking sewage pipeline pump, and control the pressure of the plate and frame filter press to 18KG, The filter cloth density is 15 microns. The filtered sludge is separated, and the filtrate is used for dyeing and recycled. The chroma of the filtrate is about 200, the decolorization rate is 90%; the chromium content is 1.45mg / L, and the chromium removal rate is 96%. ...

Embodiment 2

[0052] 1. Dyeing light brown dyeing wastewater for recycling

[0053] (1) After the new dye solution is dyed light brown, take 1500 liters of wastewater, the chroma is 750, the chromium content is 39.19mg / L, and the pH=3.5-4.2. Add 1.2 kg of lime (0.08% of the wastewater volume), adjust the pH=9.0-10.0, add 3 liters of dicyandiamide-formaldehyde polymer decolorizer solution with a concentration of 10wt% (0.2% of the wastewater volume), and add a concentration of 0.1 8 liters of wt% flocculant PAM solution (0.53% of the waste water), stir evenly, let it stand for 2 hours, pump it into the plate and frame filter press with a non-blocking sewage pipeline pump, and control the pressure of the plate and frame filter press to 18KG, The filter cloth density is 15 microns. The filtered sludge is separated, and the filtrate is used for dyeing and recycled. The color of the filtrate is about 70 times, and the decolorization rate is over 90%.

[0054] It is dyed light brown with the f...

Embodiment 3

[0078] 1. Recycling of mixed dyeing wastewater dyed light brown and dark brown

[0079] (1) After the new dyeing solution is dyed light brown and dark brown, mix the two kinds of wastewater according to the volume ratio of 1:1, take 2000 liters of wastewater, the chroma is 1800 times, pH=3.5-4.2, and the chromium content is 60.07mg / L . Add 1.625 kg of lime (0.08% of the wastewater volume), adjust the pH=9.0-10.0, add 6 liters of dicyandiamide-formaldehyde polymer decolorizing agent solution with a concentration of 10wt% (0.3% of the wastewater volume), and the concentration is 0.1wt % flocculant PAM solution 6.5 liters (0.33% of the waste water), stir evenly, let it stand for 2 hours, pump it into the plate and frame filter press with a non-clogged sewage pipeline pump, control the pressure of the plate and frame filter press to 18KG, filter The cloth density is 15 microns. The filtered sludge is separated, and the filtrate is used for dyeing and recycled. The chroma of the...

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Abstract

The invention discloses a processing method used for multiple recycling of fur dyeing effluent. The processing method comprises following steps: the fur dyeing effluent is collected; an alkaline material is added; the mixture is stirred, and pH value of the mixture is adjusted to 8.5 to 10.5; a decolorant solution is added, the mixed material is stirred; flocculating agent PAM is added, and the obtained material is stirred, is allowed to stand, and is delivered to a plate-and-frame filter press for microfiltration; and an obtained clear filtrate is recycled. The fur dyeing effluent processed via the processing method is capable of meeting with recycling standards, and can be recycled for 2 to 3 times. After drying, fur color is pure, pure is fluffy and flexible, is light and natural, equipment is simple, processing cost is low, and processing procedures are convenient to control.

Description

technical field [0001] The invention relates to a treatment method for multiple recycling of fur dyeing waste liquid. Background technique [0002] Fur has a rich coat. In order to prevent wool fibers from tangling during processing, the water consumption in the fur dyeing process is extremely large, generally 20 times the quality of fur. Since a wide variety of chemicals are added to the fur dyeing process, including difficult-to-degrade dyes, wetting agents, color-fixing agents and other additives, a considerable part of these chemicals cannot be absorbed by fur, but are directly discharged into wastewater, so The composition of fur dyeing wastewater is very complex. In addition, when the fur is dyed, a large amount of Cr is adsorbed on the fur coat and the skin plate. 3+ Salt (because the fur is chrome-tanned or chrome-retanned before dyeing), these Cr 3+ Salt will be free in dyeing wastewater. Therefore, fur dyeing wastewater has become dyeing wastewater with its own...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F9/04
Inventor 程凤侠王学川张晓镭马建标魏天全
Owner ZHEJIANG ZHONGHUI FUR & LEATHER
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