Mercury-contaminated soil ex-situ restoration device

Abstract

The invention relates to a mercury-contaminated soil ex-situ restoration device. A two-wing stirrer is arranged in the center of a slurry electrolysis cell. An anode plate and a cathode plate are arranged in the slurry electrolysis cell. Corresponding conducting plates are arranged on the two side edges of the slurry electrolysis cell. Insulation plates are arranged at the positions closely attached to the lower ends of the two conducting plates correspondingly. A slurry inlet pipe is arranged at the positions closely attached to one side or two sides of the slurry electrolysis cell. A compressed air pipe and a sludge pipe are arranged at the bottom of the slurry electrolysis cell. A mercurous chloride outlet is formed in the center of the bottom of the slurry electrolysis cell. A method comprises the steps that slurry is added into the slurry electrolysis cell to be stirred, a power source is started, compressed air is introduced, mercury in slurry is dissolved in an electrolyte, thetreated slurry is discharged from the side face of the cell bottom in a sludge form, and mercurous chloride produced through electrolysis is discharged and recovered through the cell bottom. The mercury-contaminated soil ex-situ restoration device has the beneficial effects that the mercury-contaminated soil ex-situ restoration device has the advantages of being high in production efficiency, lowin secondary pollution, high in mercury recovery value, low in cost and the like, especially the compressed air suspension electrolysis technology is adopted, and the production efficiency and mercuryrecovery rate are greatly improved.

Description

technical field [0001] The invention relates to the technical field of remediation of heavy metal-contaminated soil, in particular to a device for ex-situ remediation of mercury-contaminated soil. Background technique [0002] Soil heavy metal pollution has the characteristics of concealment, long-term and irreversibility. It directly or indirectly pollutes groundwater and air, endangers crops and organisms, and even endangers human health and life. Therefore, repairing heavy metal-contaminated soil and restoring the original function of soil has always been It is a hot research task at home and abroad. In recent years, with the promulgation and implementation of my country's "Ten Soil Articles", soil remediation has become a hot spot that everyone pays attention to. Among them, the main type of soil pollution is heavy metal pollution. , the country gradually strengthens the control of mercury pollution. Therefore, the research on the remediation technology of mercury-contai...

AI Technical Summary

Problems solved by technology

Solidification / stabilization technology and equipment can effectively reduce the activity of heavy metals in the soil and control the migration of mercury in polluted areas. However, since the solidification and stabilization technology treats the pollutants in the whole process, the pollutants still remain in the soil, and its environmental risk still exists in the repair cycle of the soil leaching technology. Short, high efficiency, but limited by soil type and chemicals, its applicability is poor, and there is secondary pollution

Electric restoration techniques are only suitable for low permeability soil types and require high energy consumption

Phytoremediation technology is affected by its biomass, and the repair effect is limited

Thermal desorption technology is a widely used technology at present, its main limiting factor is the high repair cost, and the generated tail gas needs further treatment

[0004] To sum up, all kinds of ex-situ remediation devices have certain limitations, and the society urgently needs the emergence of feasible heavy metal-contaminated soil remediation devices.

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