Device and method for repairing heavy metal polluted field soil through microwave-assisted chemical washing

Abstract

The invention discloses a device and a method for repairing heavy metal polluted field soil through microwave-assisted chemical washing. The device comprises a washing agent storage tank, a high-speed stirring soil and water mixing device, a first lifting pump, a transmission type microwave reinforcement reaction integration system, a settling pool, a mud and water separation system, a washing liquid recovery tank, a second lifting pump and a washing liquid purification regeneration device. Polluted soil, after in-situ crushing and screening, and a washing agent are added in the high-speed mixing device for uniform mixing; then, the transmission type microwave reaction integration system is opened for microwave washing; heavy metal can be removed from the soil in a short time under a microwave effect, and is conveyed along with a conveying belt; mud and water mixed liquid, after the reaction, is directly poured into the settling pool; supernatant in the settling pool directly enters the washing liquid recovery tank; settled mud passes through the mud and water separation system; separated liquid enters the washing liquid recovery tank; and the soil is filled back after being repaired. The recovered washing liquid is filtered, purified, regenerated and recycled.

Description

technical field [0001] The invention relates to the field of soil restoration devices and methods in environmental protection, in particular to a device and method for repairing heavy metal-contaminated soil by microwave-assisted chemical leaching. Background technique [0002] With the continuous expansion of industrial production scale and the further advancement of industrial structure adjustment, a large number of industrial enterprises have been shut down and transferred, bankrupted or relocated, and the remaining heavy metal polluted sites have been redeveloped and utilized as urban construction land. The use of chemical fertilizers and pesticides containing heavy metals, sewage irrigation, and agricultural sludge has continuously expanded the area of ​​heavy metal soil pollution, and soil heavy metal pollution has become one of the global environmental problems that have attracted much attention. [0003] Soil heavy metal pollution has the characteristics of long-term...

AI Technical Summary

Problems solved by technology

And it is predicted that this device can achieve efficient removal of heavy metals in polluted soil, but there is no case of implementation of this device

Because the device is designed with two stirring and mixing devices, the energy consumption is high; and the intermittent operation of the microwave washing device is required, the degree of automation is low, and it is difficult to realize the large-scale application of restoration projects

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