Electrokinetic remediation enhancing device and method using same to remove heavy metal in sludge

A technology of electric repair and strengthening device, which is applied in the field of secondary resource recovery and environmental engineering, can solve the problem of low removal rate of heavy metals, and achieve the effect of improving the electric repair rate

Active Publication Date: 2017-06-30
有研资源环境技术研究院(北京)有限公司
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Problems solved by technology

[0004] Aiming at the problem of low removal rate of heavy metals in sludge with low permeability, fine particle size and complex components, the purpose

Method used

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  • Electrokinetic remediation enhancing device and method using same to remove heavy metal in sludge

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Embodiment 1

[0030] (1) Sludge pretreatment: Take 400g of smelting wastewater sludge from the wet sludge sample by nine grid method. The main metal content in the smelting wastewater sludge is Cu 5.01%, Ni 0.61%, Pb 0.68%, Cr 0.028%, Ca 8.56%.

[0031] (2) Pretreat the sludge with sulfuric acid with a concentration of 2mol / L. The pretreatment method is to stir with a magnetic stirrer for 0.5h at a speed of 250 / min. The water content of the pretreated sludge is 80%, and the initial pH value is 6.

[0032] (3) Loading into the electrolytic cell: layer the pretreated sludge in (1) into the rectangular box in the middle of the electric restoration electrolytic cell, press evenly, and put activated carbon into the cathode side of the electrolytic cell.

[0033] (4) Inject distilled water into the cathodic electrolytic cell and the anode electrolytic cell, and replace the distilled water with the electrolyte after standing for 24 hours until osmotic equilibrium, the catholyte and the anolyte ar...

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Abstract

The invention discloses an electrokinetic remediation enhancing device and a method using same to remove heavy metal in sludge. The electrokinetic remediation enhancing device comprises an electrokinetic remediation system and a pH (potential of hydrogen) control system, wherein the electrokinetic remediation system comprises an electrokinetic remediation electrolytic bath, a cathode electrolytic cell and an anode electrolytic cell; the cathode electrolytic cell and the anode electrolytic cell are positioned at two ends of the electrokinetic remediation electrolytic bath; an ion enhancing transfer cell and activated carbon are arranged in the electrokinetic remediation electrolytic bath. The method using the electrokinetic remediation enhancing device to remove the heavy metal in the sludge comprises the following steps of (1) sludge pretreatment: pretreating a wet sludge sample by 0.5 to 3mol/L of sulfuric acid, so as to obtain the sludge with the water content of 70 to 85%; (2) putting the pretreated sludge into the ion enhancing transfer cell of the electrokinetic remediation electrolytic bath layer by layer; (3) energizing for 3 to 10 days under the condition of potential gradient of 0.5 to 2V/cm, and controlling the pH (potential of hydrogen) value of a catholyte to 2 to 4. The electrokinetic remediation enhancing device and the method have the advantages that the problem of difficulty in transfer of metal ions in the sludge is solved, and the electrokinetic remediation rate of the heavy metal in the sludge is improved.

Description

technical field [0001] The invention relates to an electric repair strengthening device and a method for removing heavy metals in sludge by using the device, belonging to the technical fields of secondary resource recovery and environmental engineering. Background technique [0002] With the rapid development of metallurgy, chemical industry, mining, electronics and foundry industries and the promulgation of the "Water Ten Rules", the treatment of domestic sewage and industrial wastewater has been increasing, and the problem of heavy metal contaminated sludge produced by water treatment has become increasingly serious. If this sludge is not disposed of properly, it will not only endanger the environment and human survival, but also lose valuable resources. Therefore, scientific and reasonable treatment is required, and it is very important to realize the resource utilization of sludge at the same time. Electric remediation refers to the process in which low direct current i...

Claims

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Application Information

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IPC IPC(8): C02F11/00
CPCC02F11/00C02F11/002C02F11/004C02F11/006C02F2101/20
Inventor 徐政胡艳平黄松涛杨丽梅纪仲光李岩王巍
Owner 有研资源环境技术研究院(北京)有限公司
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