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A kind of soil purification method of heavy metal pollution

A soil purification and heavy metal technology, which is applied in the field of soil purification of heavy metal pollution, can solve the problems of poor purification ability and single soil purification effect, and achieve the effect of strong infiltration ability, reasonable cost and reduced heavy metal content

Active Publication Date: 2022-08-05
陕西天时科邦建设工程有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] The purpose of the present invention is to provide a method for purifying soil polluted by heavy metals, which solves the problem of single soil purification effect and poor purification ability in the prior art

Method used

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Examples

Experimental program
Comparison scheme
Effect test

preparation example Construction

[0028] The preparation method of soil improvement filler is as follows:

[0029] In step 2.1, sponge iron, titanium dioxide, potassium permanganate and water are mixed, and then a condensation reflux reaction is carried out to obtain a reaction solution;

[0030] The reflux reaction temperature is 150-180°C, and the reflux reaction time is 2-4h;

[0031] The mass ratio of sponge iron, titanium dioxide, potassium permanganate and water is 15:5:1-2:100-200;

[0032] In step 2.2, the reaction solution obtained after step 2.1 is mixed with sawdust and modifier, and the pH of the reaction solution is adjusted to 8.0-9.5 by using ferric hydroxide solution, and then it is placed in a polyethylene tetrafluoroethylene lining. In the reaction kettle, hydrothermal reaction is carried out, and after the reaction is completed, the reaction solution is washed to neutrality with deionized water and dried to obtain soil improvement filler;

[0033] The mass ratio of reaction liquid, sawdust...

Embodiment 1

[0043] A soil purification method polluted by heavy metals of the present invention is specifically implemented according to the following steps:

[0044] Step 1, adding an acid solution to the soil contaminated by heavy metals, carrying out acidification treatment, and then naturally drying to obtain acidified soil;

[0045] The acid solution is a hydrochloric acid solution;

[0046] The acidification treatment time is 5;

[0047] The mass ratio of soil to acid solution is 100:1;

[0048] Step 2, adding soil improvement filler, deionized water, and dithiocarbamate to the acidified soil, and stirring for 1-2 hours to obtain a mixed solution;

[0049] The mass ratio of soil improvement filler, deionized water and dithiocarbamate is 10:80-200:5;

[0050] The preparation method of soil improvement filler is as follows:

[0051] In step 2.1, sponge iron, titanium dioxide, potassium permanganate and water are mixed, and then a condensation reflux reaction is carried out to obta...

Embodiment 2

[0064]A soil purification method polluted by heavy metals of the present invention is specifically implemented according to the following steps:

[0065] Step 1, adding an acid solution to the soil contaminated by heavy metals, carrying out acidification treatment, and then naturally drying to obtain acidified soil;

[0066] The acid solution is a hydrochloric acid solution or a nitric acid solution;

[0067] The acidification treatment time is 8h;

[0068] The mass ratio of soil to acid solution is 100:1.5;

[0069] Step 2, adding soil improvement filler, deionized water, and dithiocarbamate to the acidified soil, and stirring for 1 hour to obtain a mixed solution;

[0070] The mass ratio of soil improvement filler, deionized water and dithiocarbamate is 10:80-200:5;

[0071] The preparation method of soil improvement filler is as follows:

[0072] In step 2.1, sponge iron, titanium dioxide, potassium permanganate and water are mixed, and then a condensation reflux reacti...

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Abstract

The invention discloses a method for purifying soil polluted by heavy metals, which comprises the following steps: first, adding an acid solution to the soil polluted by heavy metals, performing acidification treatment, and drying to obtain acidified soil; adding soil improvement filler to the acidified soil , deionized water, dithiocarbamate, and stirring to obtain a mixed solution; finally, adding sodium carbonate solution and nitrate lime solution to the mixed solution for solidification treatment, the soil purification can be completed. The invention provides a soil purification method with strong infiltration capacity, purification capacity, long life and reasonable cost; after purification, the heavy metal content in the soil is significantly reduced, and the purification process does not generate solid waste and secondary pollution; This method has broad applicability and operability.

Description

technical field [0001] The invention belongs to the technical field of soil purification, and in particular relates to a soil purification method contaminated by heavy metals. Background technique [0002] Soil not only provides mechanical support for plant growth, but also provides fertility elements such as water, fertilizer, air, and heat for plant growth and development. In recent years, due to the rapid growth of population and the rapid development of industry, solid waste has been continuously stacked and dumped on the soil surface, harmful waste water has been continuously infiltrating into the soil, exhaust gas from automobiles, harmful gases and floating dust in the atmosphere have been continuously falling into the soil with rainwater. The improvement of the level of agricultural chemistry has caused a large number of chemical fertilizers and pesticides to be scattered into the environment, resulting in more and more opportunities for soil pollution, and the degre...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): B09C1/08B09C1/00C09K17/40
CPCB09C1/08B09C1/00C09K17/40
Inventor 付扬裴峰
Owner 陕西天时科邦建设工程有限公司
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