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

A chemical leaching, microwave-assisted technology, applied in the restoration of polluted soil and other directions, can solve the problems of difficult to achieve large-scale application of restoration projects, high energy consumption, low degree of automation, etc., reducing raw material and labor input, shortening restoration cycle, improve the effect of repair efficiency

Active Publication Date: 2015-12-23
NANJING UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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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,

Method used

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

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Embodiment

[0031]The device for repairing heavy metal-contaminated soil by microwave-assisted chemical leaching consists of a leaching agent storage tank 1, a high-speed stirring soil-water mixing device 2, a first lifting pump 31, and a transmission type microwave enhanced reaction integrated system 4 (including a transmission shaft 41 and a conveyor belt 42 , and a microwave reaction unit box 43, a microwave reaction cover 44, a microwave power source 45), a settling tank 5, a mud-water separation system 6, a eluent recovery tank 7, a second lifting pump 32 and an eluent purification and regeneration device 8; Among them, the eluent storage tank 1 is connected in turn with the high-speed stirring soil-water mixing device 2, the first lift pump 31, the transmission type microwave enhanced reaction integrated system 4, and the sedimentation tank 5, and the sedimentation tank 5 is connected with the mud-water separation system 6, eluent The recovery tank 7 is connected respectively, and th...

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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...

Claims

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Application Information

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IPC IPC(8): B09C1/00B09C1/02B09C1/08
CPCB09C1/00B09C1/02B09C1/08
Inventor 郭红岩张庆泉刘志超艾弗逊吴海锁季荣尹颖王水
Owner NANJING UNIV
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