Electrochemical method for dechlorination and heavy metal removal for incineration fly ash water washing liquid

A technology for incinerating fly ash and heavy metals, applied in the field of water treatment, can solve the problems of forward osmosis membrane and draw liquid performance constraints, and achieve the effects of controllable reaction rate, energy saving, and small footprint

Inactive Publication Date: 2020-06-12
UNIV OF SCI & TECH BEIJING
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Theoretically, forward osmosis is the most ideal technical means, but the performance of forward osmosis membrane and draw liquid restricts the practical application

Method used

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  • Electrochemical method for dechlorination and heavy metal removal for incineration fly ash water washing liquid
  • Electrochemical method for dechlorination and heavy metal removal for incineration fly ash water washing liquid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039]The total effective volume of the reactor is 49ml, and the effective volumes of the cathode chamber and the anode chamber are both 24.5ml. Both the cathode and the anode are titanium-plated rhodium oxide inert electrodes, and a constant current of 0.2A is fed to both ends of the electrolytic cell for a residence time of 3h. Cl in the washing liquid of incineration fly ash after pretreatment - The initial concentration is 31.13g / L, the content of seven heavy metals Zn, Pb, Cu, Mn, As, Cr, and Cd is 15.82mg / L, and the Cl in the washing solution in the anode chamber at the end of electrolysis - Concentration is 2.18g / L, reactor Cl - The removal rate reaches 93.00%, the heavy metal content is 6.37mg / L, and the heavy metal removal rate reaches 60%; the concentration of lye produced in the cathode chamber is 12.82g / L; Cl 2 The absorption rate is over 90%.

Embodiment 2

[0041] The reactor is the same as in Example 1, and a constant current of 0.2A is passed into the electrolytic cell, and the residence time is 3.5h. Cl in the washing liquid of incineration fly ash after pretreatment - The initial concentration is 31.13g / L, the content of seven heavy metals Zn, Pb, Cu, Mn, As, Cr, and Cd is 15.82mg / L, and the Cl in the washing solution in the anode chamber at the end of electrolysis - Concentration is 2.08g / L, reactor Cl - The removal rate reaches 93.32%, the heavy metal content is 5.96mg / L, and the heavy metal removal rate reaches 62.30%; the concentration of lye produced in the cathode chamber is 13.86g / L; Cl 2 The absorption rate is over 90%.

Embodiment 3

[0043] The reactor is the same as in Example 1, and a constant current of 0.2A is passed into the electrolytic cell for a residence time of 4h. Cl in the washing liquid of incineration fly ash after pretreatment - The initial concentration is 31.13g / L, and the seven heavy metal contents of Zn, Pb, Cu, Mn, As, Cr, and Cd are 15.82mg / L. At the end of electrolysis, Cl in the washing solution in the anode chamber - Concentration is 2.02g / L, reactor Cl - The removal rate reaches 93.51%, the heavy metal content is 5.62mg / L, and the heavy metal removal rate reaches 64.50%; the concentration of lye produced in the cathode chamber is 14.92g / L; Cl 2 The absorption rate is over 90%.

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Abstract

The invention provides an electrochemical method for dechlorination and heavy metal removal for incineration fly ash water washing liquid, and belongs to the technical field of water treatment. A device used in the method comprises an electrolytic cell, a cathode electrode plate, an anode electrode plate, a gas absorption bottle, a gas bag and the like. In the method, pretreated incineration fly ash water washing liquid enters an anode chamber, Cl <-> in the water washing liquid generates chlorine at an anode under the action of an electric field, and heavy metal ions are removed through an electro-deposition reaction at a cathode. The method is simple in dechlorination and heavy metal removal operation, small in occupied area and high in treatment efficiency, the generated chlorine and hydrogen can be further recycled, and secondary pollution is avoided.

Description

technical field [0001] The invention relates to the technical field of water treatment, in particular to an electrochemical method for dechlorinating and removing heavy metals from incinerated fly ash washing liquid. Background technique [0002] Domestic waste incineration technology has been widely promoted in my country in recent years due to its obvious advantages in reduction, stabilization and resource utilization. However, because the fly ash produced during the incineration process contains a certain amount of heavy metals, soluble salts and dioxin and other pollutants, so the treatment and disposal of incineration fly ash has gradually become a research point. At present, water washing is the most commonly used treatment method at home and abroad, which can remove a large amount of soluble chlorine in fly ash, so as to improve the stabilization effect of subsequent treatment processes on fly ash, and make fly ash be better utilized as a resource. However, the washin...

Claims

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Application Information

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IPC IPC(8): C02F1/469C02F101/22C02F101/20C02F101/12
CPCC02F1/4693C02F2101/12C02F2101/20C02F2101/22
Inventor 汪群慧邹德志高明吴川福王晓娜
Owner UNIV OF SCI & TECH BEIJING
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