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Method for concentrating wastewater containing hydrochloric acid by two-stage electrodialysis

A technology of one-stage electrodialysis and electrodialysis, which is applied in the field of two-stage electrodialysis to concentrate hydrochloric acid-containing wastewater, can solve the problems of no electrodialysis desalination solution treatment, etc., and achieve the effect of less alkali consumption and low salt concentration

Inactive Publication Date: 2018-11-13
HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, there is no further treatment method for this type of electrodialysis desalination solution

Method used

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  • Method for concentrating wastewater containing hydrochloric acid by two-stage electrodialysis
  • Method for concentrating wastewater containing hydrochloric acid by two-stage electrodialysis

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0028] The hydrochloric acid-containing wastewater from a company in Shanghai was subjected to two-stage electrodialysis concentration, wherein the concentration of hydrochloric acid was 0.78%, and the content of impurity amino acids was 1%. The arrangement of the electrodialysis membrane stack used is: anode - anode chamber - [cation exchange membrane - concentration chamber - anion exchange membrane - desalination chamber] n - cation exchange membrane - cathode compartment - cathode, where n is 5. The cathode is connected to the negative pole of the power supply, and the anode is connected to the positive pole of the power supply. The cation exchange membrane in the membrane stack of the electrodialysis device used is CJMC-5 produced by Hefei Kejia Polymer Material Technology Co., Ltd., and the anion exchange membrane is the acid-blocking anion exchange membrane CJMA- produced by Hefei Kejia Polymer Material Technology Co., Ltd. 6. The limited area of ​​single sheet film is...

Embodiment 2

[0032] The hydrochloric acid-containing wastewater from a company in Shanghai was subjected to two-stage electrodialysis concentration, wherein the concentration of hydrochloric acid was 0.78%, and the content of impurity amino acids was about 1%. The arrangement of the electrodialysis membrane stack used is: anode - anode chamber - [cation exchange membrane - concentration chamber - anion exchange membrane - desalination chamber] n - cation exchange membrane - cathode compartment - cathode, where n is 5. The cation exchange membrane in the membrane stack of the electrodialysis device used is CJMC-5 produced by Hefei Kejia Polymer Material Technology Co., Ltd., and the anion membrane is the acid-blocking anion exchange membrane CJMA-6 produced by Hefei Kejia Polymer Material Technology Co., Ltd. , the finite area of ​​the sheet film is 189cm 2 .

[0033] The electrolytic solution added in the anode chamber and the cathode chamber is 0.15mol / L sulfuric acid solution during th...

Embodiment 3

[0036] The hydrochloric acid-containing wastewater from a company in Shanghai was subjected to two-stage electrodialysis concentration, in which the concentration of hydrochloric acid was 1.14%, and the content of impurity amino acids was about 1%. The arrangement of the electrodialysis membrane stack used is: anode - anode chamber - [cation exchange membrane - concentration chamber - anion exchange membrane - desalination chamber] n - cation exchange membrane - cathode compartment - cathode, where n is 5. The cation exchange membrane in the membrane stack of the electrodialysis device used is CJMC-5 produced by Hefei Kejia Polymer Material Technology Co., Ltd., and the anion membrane is the acid-blocking anion exchange membrane CJMA-6 produced by Hefei Kejia Polymer Material Technology Co., Ltd. , the finite area of ​​the sheet film is 189cm 2 .

[0037]The electrolytic solution added in the anode chamber and the cathode chamber is 0.15mol / L sulfuric acid solution during th...

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Abstract

The invention discloses a method for concentrating wastewater containing hydrochloric acid by two-stage electrodialysis. The method includes that first a waste liquid containing about 1% hydrochloricacid is concentrated by first-stage electrodialysis, the concentration of the hydrochloric acid in the concentrated liquid can reach 3% or more, and the hydrochloric acid can be directly reused; the concentration of the hydrochloric acid in a desalinated solution can be reduced to less than 0.2%; then the desalinated solution of the first-stage electrodialysis can be further desalinated and concentrated by second-stage electrodialysis to reduce the concentration of the hydrochloric acid to less than 0.05%, meanwhile the concentration of the hydrochloric acid in the concentrated solution can reach more than 1%, and the concentrated liquid is returned to the first-stage electrodialysis as a concentration chamber initial solution for recycling. The method is simple in operation, economical and environmentally friendly. The low concentration hydrochloric acid in the waste liquid can be directly concentrated and reused, and the concentration of the hydrochloric acid in the desalinated solution is very low, and the desalinated solution can be discharged by simply adding a small amount of alkali for neutralization, so that treatment of the wastewater containing the low-concentration hydrochloric acid can be achieved.

Description

technical field [0001] The invention relates to a method for concentrating hydrochloric acid-containing wastewater by two-stage electrodialysis, and belongs to the technical field of industrial wastewater treatment. Background technique [0002] The hydrochloric acid-containing wastewater brought about by the extensive use of hydrochloric acid in the industrial production process has had a serious impact on the environment, especially water resources and soil, and has become one of the current environmental protection problems that need to be solved urgently. Among them, in the food production process, it is often necessary to use a certain concentration of hydrochloric acid (generally greater than 3%) to acidify the material to prepare corresponding amino acids or other products. During this process, a large amount of waste hydrochloric acid solution is also produced, and its concentration is generally around 1%. The conventional treatment method is mainly to discharge aft...

Claims

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Application Information

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IPC IPC(8): C02F9/06C02F101/12
CPCC02F1/4693C02F1/66C02F2101/12
Inventor 汪耀明颜海洋王晓林李为李传润吴亮徐铜文张勤
Owner HEFEI CHEMJOY POLYMER MATERIALS CO LTD
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