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Device and method for cooperatively treating pickling waste liquid and electroplating sludge by using electrodialysis technology

A technology of electroplating sludge and pickling waste liquid, which is applied in the field of electrochemistry, can solve the problems of low treatment efficiency, waste of resources and energy, and low efficiency of heavy metal removal or utilization, and achieve the effect of reducing energy input

Pending Publication Date: 2019-10-18
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] Due to their own characteristics, electroplating sludge and pickling waste liquid have been included in the national list of hazardous wastes. The current disposal method for hazardous wastes is to entrust qualified units to carry out harmless treatment. The existing treatment technologies all have low treatment efficiency, Resource and energy waste and other issues make many hazardous waste disposal companies urgently need new technologies for hazardous waste disposal, and can recover valuable substances and energy during the treatment process
[0005] Nowadays, for the co-processing of electroplating sludge and pickling waste liquid, most of them are directly mixed, and the purpose of recycling ferrite is achieved by controlling the mixing ratio and adding some additives, although this method has achieved For the purpose of waste treatment, but the removal or utilization efficiency of other heavy metals is not high, and the requirements for the type of sludge are relatively high

Method used

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  • Device and method for cooperatively treating pickling waste liquid and electroplating sludge by using electrodialysis technology

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Step 1. Device installation;

[0038] The electrodialysis device is assembled according to the schematic diagram of the device. After the assembly is completed, the treated pickling waste liquid is added to the anode area, and the treated mud-water mixture with a mud-to-water volume ratio of 1:9 is added to the cathode area. Electrodes are installed and titanium wires are used. Connection, the external circuit is connected to a DC power supply.

[0039] Step 2. The device operates at 0.5V;

[0040] Start the electrodialysis device according to step 1. Under the action of direct current, the hydrogen ions in the pickling waste liquid in the anode area enter the cathode area through the proton exchange membrane, and react with the electroplating sludge to promote the dissolution of heavy metals in the electroplating sludge. The pH value of the waste washing liquid increased from 0.12 to 1.3.

[0041] Step 3. Metal Removal and Recovery

[0042] After the device runs for...

Embodiment 2

[0044] Step 1. Device installation;

[0045] According to the schematic diagram of the device, the electrodialysis device is assembled. After the assembly is completed, the treated pickling waste liquid is added to the anode area, and the treated mud-water mixture (ie, electroplating sludge and water) with a mud-water volume ratio of 1:9 is added to the cathode area. Electrodes are installed and connected with titanium wires, and the external circuit is connected with a DC power supply.

[0046] Step 2. The device operates at 1.2V;

[0047] Start the electrodialysis device according to step 1. Under the action of direct current, the hydrogen ions in the pickling waste liquid in the anode area enter the cathode area through the proton exchange membrane, and react with the electroplating sludge to promote the dissolution of heavy metals in the electroplating sludge. The pH value of the waste washing liquid increased from 0.12 to 1.54.

[0048] Step 3. Metal Removal and Recover...

Embodiment 3

[0051] Step 1. Device installation;

[0052] According to the schematic diagram of the device, the electrodialysis device is assembled. After the assembly is completed, the treated pickling waste liquid is added to the anode area, and the treated mud-water mixture (ie, electroplating sludge and water) with a mud-water volume ratio of 1:9 is added to the cathode area. Electrodes are installed and connected with titanium wires, and the external circuit is connected with a DC power supply.

[0053] Step 2. The device operates under 2.1V;

[0054] Start the electrodialysis device according to step 1. Under the action of direct current, the hydrogen ions in the pickling waste liquid in the anode area enter the cathode area through the proton exchange membrane, and react with the electroplating sludge to promote the dissolution of heavy metals in the electroplating sludge. The pH value of the waste washing liquid increased from 0.12 to 1.91.

[0055] Step 3. Metal removal and reco...

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Abstract

The invention discloses a device and method for cooperatively treating pickling waste liquid and electroplating sludge by using an electrodialysis technology. The device comprises an anode region, a cathode region and a proton exchange membrane arranged between the anode region and the cathode region, wherein an anode electrode is arranged in the anode region; the anode electrode is connected witha positive electrode of a power supply; the cathode region is internally provided with a cathode electrode; and the cathode electrode is connected with a negative electrode of the power supply. The method for cooperatively treating the pickling waste liquid and the electroplating sludge by using the electrode electrodialysis technology comprises the steps that the pickling waste liquid is added into the anode region, the electroplating sludge and water are added into the cathode region to form electroplating sludge water, the power supply is turned on and the device is started, and under theaction of a direct current, hydrogen ions in the pickling waste liquid in the anode region enter the cathode region through the proton exchange membrane to react with the electroplating sludge so as to promote the dissolution of heavy metals in the electroplating sludge. The purpose of treating waste by waste is achieved, and the device and method conform to the concept of sustainable development.

Description

technical field [0001] The invention relates to the technical field of electrochemistry, in particular to a device and method for co-processing pickling waste liquid and electroplating sludge by using electrodialysis technology. Background technique [0002] Electrodialysis technology (ED) was discovered by German scientists Morse and Pierce in 1903. Pauli improved his device in 1924. In 1950, Juda developed a membrane with good selectivity, making electrodialysis technology enter the practical stage. Electrodialysis mainly uses the directional migration of charged ions in the solution under the action of a direct current electric field, and the ions selectively pass through the ion exchange membrane, thereby realizing the separation or enrichment of ions. This technology is widely used in desalination and industrial wastewater treatment due to its simple operation and no pollution. The treatment of industrial wastewater mainly focuses on the treatment of wastewater contain...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): C02F1/469C02F11/15C02F103/16
CPCC02F1/4693C02F11/15C02F2103/16
Inventor 沈博文胡勤海王忠东应文婷
Owner ZHEJIANG UNIV
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