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Integrated device and method for heavy metal contaminated soil remediation and eluent recycling

A technology for polluted soil and heavy metals, applied in the restoration of polluted soil, etc., can solve the problems of non-reuse of the lotion, secondary pollution, low efficiency of circulating leaching, etc., to increase the electrode surface area, small footprint, improve The effect of electrolysis efficiency

Active Publication Date: 2016-08-17
石家庄源美工程咨询有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, in this method, heavy metals are contained in the lotion after each wash. Due to the continuous accumulation of heavy metal concentration in the circulating lotion, repeated washing with the circulating solution has no obvious effect on reducing the residual heavy metals in the soil. Low, the final lotion cannot be reused due to the excessive concentration of heavy metals, and if the waste liquid is not treated, it will cause secondary pollution

Method used

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  • Integrated device and method for heavy metal contaminated soil remediation and eluent recycling
  • Integrated device and method for heavy metal contaminated soil remediation and eluent recycling
  • Integrated device and method for heavy metal contaminated soil remediation and eluent recycling

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0039] Example 1 An integrated device for remediation of heavy metal-contaminated soil and recycling of eluent

[0040] Such as figure 1 As shown, this embodiment is an integrated device for remediation of heavy metal-contaminated soil and eluent recycling, which includes a leaching tower 1, a sedimentation tank 2, a water pump 3, and an electrochemical reactor 4 that are sequentially connected in a ring through communication pipes. , a circulation pump 5, a first liquid storage tank 6, and a second liquid storage tank 7 is arranged outside the electrochemical reactor 4.

[0041] Such as figure 2 As shown, the washing tower 1 includes a first liquid inlet 17 , a nozzle 11 , a baffle 15 , a first gauze layer 13 , a second gauze layer 18 , a pebble layer 12 , heavy metal contaminated soil 14 , and a funnel 16 . The top of the leaching tower 1 is provided with a first liquid inlet 17 connected to the first liquid storage tank 6 through a connecting pipe, and a plurality of spr...

Embodiment 2

[0050] Example 2 A method for remediation of heavy metal-contaminated soil and recycling of eluent

[0051] This embodiment is a method for remediation of heavy metal-contaminated soil and recycling of eluent, which is realized by relying on the integrated device described in Embodiment 1, and is carried out according to the following sequence of steps:

[0052] ①In the leaching tower, the heavy metal contaminated soil is leached by EDTA solution with a pH of 3 and a concentration of 0.01mol / L. The liquid-solid ratio in the leaching tower is 20, and liquid A is obtained at the bottom of the tower;

[0053] ② After liquid A was settled in the sedimentation tank for 10 minutes, the upper layer obtained liquid B;

[0054] ③Liquid B is pumped into the electrochemical reactor filled with 0.01mol / L sodium sulfate solution, and the valve of the second liquid storage tank is opened to flow into Fe 2+ with H 2 o 2 The molar ratio of Fenton's reagent is 1:2, the flow rate of Fenton's...

Embodiment 3-6

[0058] Embodiment 3-6 Method for remediation of heavy metal contaminated soil and recycling of eluent

[0059] Embodiments 3-6 are respectively a method for remediation of heavy metal-contaminated soil and recycling of eluent, and the device used is the same as in Example 1. In each embodiment, the method for remediation of heavy metal-contaminated soil and recycling of eluent, heavy metal pollution The soil is similar to that of Example 2, except that the difference is shown in Table 1, which is that the relevant control parameters in the restoration process are different.

[0060] Table 1 The corresponding control parameters in the method of heavy metal contaminated soil remediation and eluent recycling

[0061]

[0062] As can be seen from the above table, after the treatment of heavy metal-contaminated soil in Examples 3-6, the removal rate of heavy metals is high, the efficiency of repair is high, and the number of leaching times is small. Secondary pollution, and the...

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Abstract

The invention provides an integrated device for heavy metal contaminated soil remediation and leacheate recycling. The integrated device comprises a leaching tower, a sedimentation basin, a water suction pump, an electrochemical reactor, a circulating pump and a liquid reservoir, all of which are orderly connected into a loop through communicated pipes; the device is capable of effectively removing heavy metals in soil; the leacheate can be recycled after electrochemical treatment; the device is high in remediation efficiency, low in running cost, simple in structure, high in applicability, free of noise and small in floor area. The invention also discloses a corresponding method which comprises the steps of soil leaching, sedimentation and electrochemical treatment, all of which circularly circulate; the method is capable of effectively removing heavy metals in soil and few in leaching times; the leacheate is high in circulating leaching efficiency after electrochemical treatment; secondary pollution is avoided, and aftertreatment of the leacheate is avoided, so that the treatment cost is reduced; the method is simple and the process of the method is easy to control. The integrated device and the method are applicable to remediation of heavy metal contaminated soil and leacheate recycling.

Description

technical field [0001] The invention belongs to the field of remediation of heavy metal-contaminated soil, and relates to a device and method for soil remediation and eluent recycling, in particular to an integrated device and method for heavy metal-contaminated soil remediation and eluent recycling. Background technique [0002] With the development of society, the heavy metal pollution in the environment has become more and more serious due to the developed industrial and agricultural production activities. Due to the concealment, refractory and irreversibility of heavy metals, not only large areas of soil cannot be used, but also endanger human life and health through the food chain relationship, and directly affect the function and structure of the soil ecosystem, and ultimately affect biological threats to ecological security. Therefore, the remediation and treatment of heavy metal-contaminated soil has become an urgent environmental problem to be solved. [0003] The...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/00B09C1/02B09C1/08
Inventor 袁峰多丽娜
Owner 石家庄源美工程咨询有限公司
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