Device and method for removing heavy metals in soil

Abstract

The invention discloses a device for removing heavy metals in soil. The device comprises a capillary through drainage belt buried at the bottom of a contaminated soil layer, a water collecting pipe which is communicated with the capillary through drainage belt, a heavy metal adsorption device connected with the outlet of the water collecting pipe, and a peristaltic pump connected with the water outlet of the heavy metal adsorption device, wherein the peristaltic pump is used for sending eluents back to the contaminated soil layer through a water inlet pipe, the capillary through drainage belt is provided with multiple capillary aqueducts which are arranged at intervals and have big insides and small outsides, and the capillary aqueducts are communicated with the water collecting pipe. A method for removing the heavy metals in the soil comprises the following steps: arranging the capillary through drainage belt at the bottom of heavy metal contaminated soil, rapidly discharging the eluents by the capillary through drainage belt, then discharging water of the eluents containing the heavy metals and reusing in the soil after being subjected to adsorption treatment, leaching the soil again, repeating and recycling for several times and then discharging the eluents. The device and the method for removing the heavy metals in the soil realize rapid separation of the eluents and the soil, improve the removal efficiency of the heavy metals and have a high drainage rate, high efficiency and low probability of blockage.

Description

technical field [0001] The invention relates to the field of environmental protection, in particular to a device and method for removing heavy metals in soil. Background technique [0002] In recent years, with the rapid economic development, more and more land in our country has been polluted by heavy metals. According to statistics, more than 12% of the cultivated land in our country has been seriously polluted by heavy metals, which poses a serious threat to the lives and health of the people. Therefore, it is urgent to remediate and treat soil contaminated by heavy metals. Chemical leaching is an efficient method for the remediation of heavy metal-contaminated soil. This method uses chemical eluent to transfer the heavy metals adsorbed in the solid phase of the soil to the eluate, and then further recycles the eluate rich in heavy metals, so as to achieve the purpose of repairing the soil. The key of this method is how to strengthen the mass transfer process between e...

AI Technical Summary

Problems solved by technology

For in-situ leaching, the mixing of the eluent and the soil is not sufficient, and the traditional drainage method has a slow drainage rate and is easy to clog, often unable to effectively discharge the eluent

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