An electric remediation and flipping device for heavy metal polluted soil

Abstract

A heavy metal contaminated soil (sludge and solid waste) repairing device is composed of an insulating treatment box, a steel supporting system, a COMBOPO detachable replacing type composite cathode, an alkaline CAMP bag with a controller, an inertia platy anode, a direct current power source, an electric transmission system and the like. After the device is conveyed to a contaminated site, the contaminated soil and a heavy metal activating agent are evenly mixed and transferred into the insulating treatment box; a power source is powered on, and then heavy metal in the soil can be repelled to a COMBOPO cathode material; the repaired soil is placed to the original position, meanwhile, the cathode material enriched with the heavy metal is replaced and conveyed to a smelting plant for heavy metal recycling, and accordingly permanent repairing on the heavy metal contaminated soil is achieved. By utilization of the device, 65%-95% of various kinds of heavy metals can be removed at the same time within 24-96 hours, and the device is suitable for repairing heavy metal (radioactivity and organic pollutants) contaminated soil (or waste slag, or the sludge or waste water), and can also be used for enriching and extracting of rarity, rare earth, scattered and noble metal lean ores.

Description

technical field [0001] The invention relates to the field of remediation of heavy metal-contaminated soil, in particular to an electric remediation device for permanently remediating heavy metal-contaminated soil; it can be applied to remediation of heavy metal / radioactive contaminated soil and / or silt; it can be used for heavy metal and / or organic pollutants and / or solid waste treatment of radioactive elements; can be used for enrichment and extraction of rare and / or precious metal lean ore; can be used for VOCs, SVOCs, POPs, PAHs and PCBs in soil and / or sludge and / or solid waste Low-temperature desorption and repair of organic pollutants such as; it can also be used for the treatment of industrial and mining wastewater containing pollutants. Background technique [0002] The so-called "permanent restoration" is to extract heavy metals from media such as contaminated soil (including silt and other solid waste). Theoretically speaking, heavy metal extraction methods include...

AI Technical Summary

Problems solved by technology

[0028] (1) All previous "in situ" restoration devices are experimental devices, rather than large-scale equipment that can be used in actual restoration projects

[0029] (2) Due to the use of relatively fragile materials such as filter paper, ion exchange membranes, molecular sieves, glass filter plates and porous ceramic plates, they are generally only used in laboratories, not suitable for actual engineering

[0030] (3) Laboratory equipment such as high-speed centrifuges are required to separate heavy metals, which is extremely costly and also not suitable for actual engineering

[0031] (4) Some patented technologies do not propose a solution to specifically deal with the alkaline zone. In actual use, heavy metals will encounter pH ≥ 9 within the space range of 1 / 3~2 / 3 of the total length of the treatment box from the cathode. The "alkaline band", the formation of hydroxide precipitates, which prevent heavy metals from migrating out of the soil system and eventually lead to remediation failure

[0032] (5) Other metals such as iron filings used in the anode area will enter the soil due to electrolytic reaction and migrate to the cathode during the restoration process, and the iron hydroxide precipitate formed when encountering the alkaline zone will lead to heavy metals such as Pb, Cd, and Hg Co-precipitation affects the removal efficiency of heavy metals

[0033] (6) When graphite is used as an electrode, if the thickness is thin, it will be easily broken; if the thickness is large, the weight of the equipment will be greatly increased

However, metal electrodes will be strongly corroded under high temperature (≥90°C or higher), extreme acid or alkali, and high current conditions, and frequent replacement of electrodes will lead to a sharp increase in soil remediation costs

[0034] (7) If the power supply system of wind energy and solar energy is adopted, for large-scale restoration projects, it is necessary to configure a high-power power station, which is not suitable for commercial operation

[0035] (8) If a large amount of special electrolyte or working fluid pool is required, the structure of the repair equipment will become complicated and the volume will also become larger

[0036] (9) During "in-situ electric repair", the loss of electric power and electrode fluid is very large

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