Method for removing and recovering heavy metal in sludge through electrolytic method

A heavy metal and electrolysis technology, applied in the field of solid waste resource utilization, can solve problems such as low electrolysis efficiency, inability to fully utilize current efficiency, insufficient contact between electrodes and sludge, etc., to achieve high power utilization and environmental protection Value and economic benefits, the effect of reducing ion migration distance

Inactive Publication Date: 2016-08-24
ZHEJIANG UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Due to the advantages of simple operation, stable operation, and not easy to cause secondary pollution, the electrochemical method has attracted much attention. However, traditional electrochemical treatment devices either place the waste between t

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Step 1. Adjust the moisture content of the sludge to 90%, and stir;

[0021] Take 2L of dewatered sludge from Hangzhou Qige Sewage Treatment Plant and put it in a container, add ultrapure water according to the calculated ratio, adjust the moisture content of the sludge to 90%, and stir it with a booster electric mixer at a speed of 250r / min for 10min to make the sludge mix well with water;

[0022] Step 2. Assembling the electrolysis device;

[0023] The cathode and anode are separated by an electrodialysis cationic membrane, and the sludge treated in step 1 is poured into the anode area of ​​the electrolysis device, and the cathode area is filled with 1 L of 0.05 mol / L Nacl solution. Install the stirrer and anode plate in the center of the anode area, and connect the power supply;

[0024] Step 3. Stirring electrolysis;

[0025] After installing the electrolysis device according to step 2, stir with a booster electric mixer at a speed of 200r / min, turn on the power...

Embodiment 2

[0030] Step 1. Adjust the moisture content of the sludge to 90%, and stir;

[0031] Take 2L of dewatered sludge from Hangzhou Qige Sewage Treatment Plant and put it in a container, add ultrapure water according to the calculated ratio, adjust the moisture content of the sludge to 90%, and stir it with a booster electric mixer at a speed of 250r / min for 10min to make the sludge mix well with water;

[0032] Step 2. Add a complexing agent to analyze pure ammonia water at a volume ratio of 0.12, and stir for pretreatment;

[0033] In the sludge treated in step 1, press V 氨水 / V 污泥 Add analytically pure ammonia water at a ratio of 0.12, and slowly stir for 24 hours at a speed of 100 r / min with an intensified electric mixer.

[0034] Step 3. Assemble the electrolysis device;

[0035] The anode and cathode are separated by electrodialysis cationic membrane, and then the sludge after the pretreatment in step 2 is poured into the anode area of ​​the electrolysis device, and the cat...

Embodiment 3

[0042] Step 1. Adjust the moisture content of the sludge to 90%, and stir;

[0043] Take 2L of dewatered sludge from Hangzhou Qige Sewage Treatment Plant and put it in a container, add ultrapure water according to the calculated ratio, adjust the moisture content of the sludge to 90%, and stir it with a booster electric mixer at a speed of 250r / min for 10min to make the sludge mix well with water;

[0044] Step 2. Add analytically pure ethylenediamine at a volume ratio of 0.06, and stir for pretreatment;

[0045] In the sludge treated in step 1, press V 乙二胺 / V 含水污泥 Add analytically pure ethylenediamine at a ratio of 0.06, and slowly stir for 24 hours at a speed of 100 r / min with an intensified electric mixer.

[0046] Step 3. Assemble the electrolysis device;

[0047] Separate the cathode and anode by electrodialysis cationic membrane, pour the sludge after the pretreatment in step 2 into the anode area of ​​the electrolysis device, and fill the cathode area with 1 L of 0....

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PUM

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Abstract

The invention discloses a method for removing and recovering heavy metal in sludge through an electrolytic method. The method includes the steps that the water content of the sludge is adjusted to 90%, then the sludge is stirred; a chemical agent is selectively added, stirred and pretreated; an electrolyzer is assembled and stirs the sludge for electrolysis; the heavy metal is recovered finally. The sludge is directly put in an anode region, the sludge is directly acidized with H+ generated through water electrolysis through an anode, acid does not need to be added additionally, secondary pollution is reduced, and the removal rate of the heavy metal is increased. In addition, the sludge is directly put in the anode region, an electrode can make full contact with the sludge, the current efficiency is fully used, and the electrolysis efficiency is high. The action of electrochemical reaction of a cathode and anode is used well, the membrane exchange area between the sludge and electrolyte is increased, the ionic migration distance is reduced, the heavy metal removal rate is high, the electric energy use ratio is large, the problem of heavy metal recovery is improved, the dual purposes of reducing pollution and recovering resources can be achieved, and environment value and economic benefits are achieved.

Description

technical field [0001] The invention belongs to the field of resource utilization of solid waste, and in particular relates to a method for removing and recovering heavy metals in sludge by electrolysis. Background technique [0002] The data show that the Zn content in the sludge produced by my country's urban sewage treatment plants can reach 783.4-3096.3mg / kg (dry weight), Cu can reach 131.2-394.5mg / kg (dry weight), in addition, it also contains some other heavy metals, such as Cd, Cr, Hg, Ni, Pb, etc. The existence of these heavy metals not only seriously affects the subsequent safe disposal of sludge, but also causes a great waste of metal resources. Taking Zn as an example, according to the 2010 urban sludge output of 30 million tons (80% water content), the Zn content is calculated as 1500mg / kg (dry weight), and the Zn content in it reaches 9000 tons. According to the Shanghai Futures Exchange Zn The recent quotation is 15,000 yuan / ton, and the economic value is 135 m...

Claims

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Application Information

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IPC IPC(8): C02F11/00C02F101/20
CPCC02F11/006C02F2101/20
Inventor 胡勤海裴冬冬萧晨霞唐剑昭徐俊鹏
Owner ZHEJIANG UNIV
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