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An electrodialysis membrane recovery process for acidic wastewater in viscose spinning

An acid wastewater, electrodialysis membrane technology, applied in water pollutants, natural water treatment, water/sewage treatment, etc., can solve problems such as consumption of alkaline substances, waste of resources, inability to effectively achieve acid recovery, etc. The effect of consumption and reduction of salt emissions

Active Publication Date: 2020-12-25
YIBIN GRACE GROUP CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0007] The present invention aims to solve the problem in the prior art that a large amount of alkaline substances need to be consumed to treat low-concentration acidic wastewater through acid-base neutralization, and the excluded salt substances form a waste of resources and cannot effectively realize acid recovery. question

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] An electrodialysis membrane recovery process for acidic waste water in viscose spinning, comprising the following process steps:

[0037] A. Pretreatment of low-concentration acidic wastewater

[0038] Pretreatment of low-concentration acidic wastewater;

[0039] B. Acid bath pretreatment after spinning

[0040] Pretreatment of the acid bath after spinning;

[0041] C. Set up the electrodialysis membrane module

[0042] Use H + / Na + The ion-exchange membrane is a positive membrane, and the anion-exchange membrane is a negative membrane. A plurality of positive membranes and negative membranes are staggered and fixed to form an electrodialysis membrane module, and a liquid channel is formed between adjacent positive membranes and negative membranes; the electrodialysis membrane The two ends of the component are respectively provided with a cathode and an anode;

[0043]D. After spinning, the acid bath enters the electrodialysis membrane module

[0044] The liquid...

Embodiment 2

[0050] On the basis of embodiment 1:

[0051] Preferably, in steps A and B, the pretreatment of the low-concentration acidic wastewater and the post-spinning acid bath specifically includes: filtering through micropores so that the suspended solids content is less than 10 mg / L.

[0052] Preferably, in step C, the membrane spacing of the electrodialysis membrane module is 0.2 mm, the size of the membrane is 400*800 cm, and the distance between the anode and the cathode is 30 cm.

[0053] Preferably, in step D, the low-concentration acidic wastewater contains sulfuric acid 15g / L, sodium sulfate 30g / L, zinc sulfate 1g / L; the acid bath after spinning contains sulfuric acid 115g / L, sodium sulfate 230g / L, zinc sulfate 5g / L.

[0054] Preferably or further, in step D, the flow rate ratio between the raw material liquid and the receiving liquid is 1:1.

[0055] Preferably, in step E, the voltage in the electric field is 70V, and the current is 100A.

[0056] Preferably, in step F, ...

Embodiment 3

[0059] On the basis of embodiment 1:

[0060] Preferably, in steps A and B, the pretreatment of the low-concentration acidic wastewater and the post-spinning acid bath specifically includes: filtering through micropores so that the suspended solids content is less than 10 mg / L.

[0061] Preferably, in step C, the membrane spacing of the electrodialysis membrane module is 1.0 mm, the size of the membrane is 400*800 cm, and the distance between the anode and the cathode is 50 cm.

[0062] Preferably, in step D, the low-concentration acidic wastewater contains sulfuric acid 25g / L, sodium sulfate 50g / L, zinc sulfate 8g / L; the acid bath after spinning contains sulfuric acid 120g / L, sodium sulfate 350g / L, zinc sulfate 12g / L.

[0063] Preferably or further, in step D, the flow rate ratio between the raw material liquid and the receiving liquid is 8:1.

[0064] Preferably, in step E, the voltage in the electric field is 120V, and the current is 400A.

[0065] Preferably, in step F...

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Abstract

The invention relates to an electrodialysis membrane recovery process for acid wastewater in viscose fiber spinning, and belongs to the technical field of electrodialysis membrane recovery. The process comprises steps of: pretreatment of low-concentration acid wastewater, pretreatment of an acid bath after spinning, arrangement of electrodialysis membrane components, entrance of electrodialysis membrane components to the acid bath after spinning, ion transfer, and acid bath reuse. Acid wastewater in viscose fiber spinning is treated through the specific electrodialysis membrane recovery process, sulfuric acid and zinc sulfate in the low-concentration of acid wastewater is effectively recovered, the acid bath after spinning achieves the requirements of the acid bath before spinning and is reused, and consumption of alkaline substances and discharge of salt substances are reduced.

Description

technical field [0001] The invention relates to an electrodialysis membrane recovery process, more specifically, the invention relates to an electrodialysis membrane recovery process for acidic wastewater in viscose fiber spinning, and belongs to the technical field of electrodialysis membrane recovery. Background technique [0002] Low-concentration acidic wastewater is the low-concentration acidic wastewater formed during the viscose fiber spinning process, when the deacidified water washes the filaments during the spinning and drawing process of the filaments. The low-concentration acidic wastewater includes short filament plasticized water, long Silk deacid water. The above-mentioned low-concentration acidic wastewater contains sulfuric acid, sodium sulfate and zinc sulfate. [0003] For the treatment of low-concentration acidic wastewater, the acidic wastewater is mainly neutralized by the addition of alkaline substances to form environmentally friendly salts for disch...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C02F9/06C02F103/34
CPCC02F1/00C02F1/4693C02F9/00C02F2101/101C02F2101/20C02F2103/34C02F2201/002C02F2201/46
Inventor 冯涛邓传东易家祥陈昌明刘爱兵尚薇段美科伏天兵
Owner YIBIN GRACE GROUP CO LTD
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