Ultrasonically assisted leaching device and method for restoring soil polluted by heavy metal

A polluted soil, ultrasonic-assisted technology, applied in the restoration of polluted soil and other directions, can solve the problems of unfavorable leaching technology, temperature increase of soil system, etc., and achieve the effect of reasonable processing method, simple device structure, and bright industrial application prospects.

Inactive Publication Date: 2015-08-26
JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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  • Application Information

AI Technical Summary

Problems solved by technology

Studies have shown that the acoustic cavitation effect of ultrasonic waves on soil can destroy the soil structure and release heavy metal components, which is beneficial to improve the removal effect of heavy metal leaching; but at the same time, it will cause the temperature of the soil system to rise, which is not conducive to leaching. implementation of technology

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  • Ultrasonically assisted leaching device and method for restoring soil polluted by heavy metal

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Experimental program
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Effect test

Embodiment 1

[0037] figure 1 It is a schematic diagram of an ultrasonic-assisted leaching device for repairing heavy metal-contaminated soil according to the present invention, and the device includes: a rinsing repair tank 1, a mixer 2, a stirring paddle 3, an ultrasonic emission controller 4, an ultrasonic emission device 5, and a temperature sensor 6. Constant temperature water bath 7, temperature controller 8, pH sensor 9, pH display 10, acid storage tank 11, first peristaltic pump 12, alkali storage tank 13, second peristaltic pump 14, eluent storage tank 15, second Three peristaltic pumps 16, mud pumps 17 and solid-liquid separation device 18;

[0038] Wherein, the acid storage tank 11, the alkali storage tank 13, and the eluent storage tank 15 communicate with the leaching repair tank 1 through the first peristaltic pump 12, the second peristaltic pump 14, and the third peristaltic pump 16 respectively;

[0039] The ultrasonic emitting device 5 is placed inside the rinsing repair t...

Embodiment 2

[0045] Utilize above-mentioned device to repair the method for heavy metal polluted soil, it comprises the steps:

[0046] (a) The heavy metal contaminated soil is placed in the rinsing repair tank 1, and the acid or lye in the acid storage tank 11 or the alkali storage tank 13 is added to the leaching tank 1 through the first peristaltic pump 12 and the second peristaltic pump (14). Wash and repair the tank 1, start the mixer 2, and keep the stirring paddle 3 stirring continuously, so that the pH of the soil in the tank is uniform and constant;

[0047] (b) open temperature controller 8, keep the constant temperature in constant temperature water bath box 7;

[0048] (c) Add the eluent in the eluent storage tank 15 into the eluent repair tank 1 through the third peristaltic pump 16, turn on the ultrasonic emission controller 4, and stir the stirring paddle 2 continuously to make the eluent in the eluent repair tank 1 The soil and the eluent are fully mixed to ensure that the...

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Abstract

The invention discloses an ultrasonically assisted leaching device for restoring soil polluted by heavy metal. An acid storage trough, an alkaline storage trough and a leacheate storage trough are respectively communicated with a leaching restoring tank through a first peristaltic pump, a second peristaltic pump and a third peristaltic pump. An ultrasonic transmitting device is arranged in the leaching restoring tank and controlled by an ultrasonic transmitting controller arranged at the outer part of the leaching restoring tank. A pH sensor is arranged in the leaching restoring tank, and the pH sensor is communicated with a pH display arranged at the outer part of the leaching restoring tank. A stirring paddle is arranged in the leaching restoring tank, the rotating speed of the stirring paddle is controlled by a stirrer, and the work of the ultrasonic transmitting device and the pH sensor is not affected by the rotating of the stirring paddle. A thermostable water bath box is arranged at the bottom and the outer wall of the leaching restoring tank, a temperature sensor is arranged in the thermostable water bath box, and the temperature sensor is controlled by a temperature controller at the outer part of the thermostable water bath box. The bottom of the leaching restoring tank is communicated with a solid-liquid separating device through a mud pump. The invention further discloses a method of utilizing the device to restore soil polluted by heavy metal.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to an ultrasonic-assisted leaching device and method for repairing heavy metal-contaminated soil. Background technique [0002] Soil is the foundation of food and clothing for human beings to survive. With the development of society and industry, the soil environment is being seriously polluted, including heavy metal pollution, organic pollution and other pollution. In 2014, the "National Soil Pollution Survey Bulletin" jointly issued by the Ministry of Environmental Protection and the Ministry of Land and Resources showed that the overall situation of my country's soil environment is not optimistic, and some areas have serious soil pollution, the most serious being heavy metal pollution, followed by organic pollution. Heavy metals are hidden, accumulated, regional, long-term, non-degradable, and easily cause groundwater pollution in soil, which serious...

Claims

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Application Information

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IPC IPC(8): B09C1/02
Inventor 吴海锁李冰王水丁亮曲常胜王栋郭红岩朱迟江野立
Owner JIANGSU PROVINCIAL ACAD OF ENVIRONMENTAL SCI
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