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A combined leaching and electric repair method for heavy metal-contaminated soil

A technology of contaminated soil and joint remediation, which is applied in the restoration of contaminated soil and other directions, can solve problems such as affecting the remediation effect, and achieve the effect of reducing the amount of use, strengthening the effect of leaching and remediation, and reducing the risk of leaching.

Active Publication Date: 2017-09-15
江苏省环境工程技术有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the current electric repair technology has the problem that the change of pH value seriously affects the repair effect.

Method used

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  • A combined leaching and electric repair method for heavy metal-contaminated soil

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Depend on figure 1 It can be seen that the electric combined restoration device for washing heavy metal contaminated soil of the present invention comprises the following: a washing system and an electric restoration system;

[0037] The leaching system includes a leaching liquid storage tank 1, a first peristaltic pump 2, a mixer 3, an acid storage tank 4, a second peristaltic pump 5, an alkali storage tank 6, a third peristaltic pump 7 and a contaminated soil storage tank 8 Wherein, eluent storage tank 1, acid storage tank 4, alkali storage tank 6 communicate with contaminated soil storage tank 8 through first peristaltic pump 2, second peristaltic pump 5 and third peristaltic pump 7 respectively; A mixer 3 is arranged inside the tank 8;

[0038]The electrokinetic restoration system includes an anode electrode 10, a cathode electrode 11, an anolyte storage tank 12, a fourth peristaltic pump 13, a stirring device 14, an anode chamber 15, a cathode chamber 16, an elect...

Embodiment 2

[0041] Utilize the device of embodiment 1 to carry out the method for the leaching electric combined repair of heavy metal polluted soil, this method comprises the steps:

[0042] (a) The heavy metal contaminated soil is placed in the contaminated soil storage tank 8, and the acid solution or alkali solution in the acid storage tank 4 or the alkali storage tank 6 is added to the contaminated soil storage tank by the second peristaltic pump 5 or the third peristaltic pump 7 respectively. In the tank 8, the mixer 3 is turned on for continuous stirring, so that the pH of the soil in the contaminated soil storage tank 8 is uniform;

[0043] (b) Add the eluent in the eluent storage tank 1 to the contaminated soil storage tank 8 through the first peristaltic pump 2, keep the mixer 3 for continuous stirring, and fully mix the soil in the contaminated soil storage tank 8 with the eluent Evenly, to ensure that the heavy metal components fully react with the eluent to form complexes and...

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Abstract

The invention discloses a combined leaching electric restoration device and method for heavy metal polluted soil. The device includes a leaching system and an electric restoration system; The storage tank is connected to the contaminated soil storage tank through the first, second and third peristaltic pumps respectively; the contaminated soil storage tank is provided with a mixer; The cathode chamber; the anode chamber and the cathode chamber are respectively provided with a stirring device; the cathode of the DC power supply is connected to the cathode electrode placed in the cathode chamber, and the anode of the DC power supply is connected to the anode electrode placed in the anode chamber; the anolyte storage tank passes through the fourth and The fifth peristaltic pump is connected with the anode chamber to form a loop; the catholyte storage tank is connected with the cathode chamber through the sixth and seventh peristaltic pumps to form a loop; the bottom of the contaminated soil storage tank in the leaching system is connected to the electric restoration chamber through the mud pump connected.

Description

technical field [0001] The invention belongs to the technical field of environmental protection, and in particular relates to a combined leaching electric repair device and method for heavy metal polluted 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 concealed, accumulated, regional, long-term, non-degradable, and cause groundwater pollution in soil, which seriously threatens h...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/02
Inventor 王水丁亮曲常胜王栋李冰吴海锁朱迟江野立孙一宁
Owner 江苏省环境工程技术有限公司
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