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Method for repairing lead-cadmium contaminated soil

A technology of polluted soil and restoration method, applied in the field of polluted soil treatment, can solve problems such as human health and soil environmental hazards, and achieve the effects of low cost, low investment and convenient operation

Inactive Publication Date: 2015-09-30
CHANGZHOU UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Lead and cadmium pollution not only inhibit the degradation of organic matter in soil, soil respiratory metabolism, soil ammonification and nitrification, but more seriously, lead and cadmium can also be transformed into more toxic metal-organic compounds, which are harmful to human health, The soil environment poses greater harm

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0024] The contaminated soil of a lead and cadmium enterprise in Changzhou City, Jiangsu Province was analyzed to have a soil pollution depth of 1.5 meters, and it is planned to be repaired in two steps. Apply domestic waste after aerobic composting on the polluted soil, the application thickness is 0.05 meters, plow the polluted soil to be repaired, the depth of each plowing is 0.8 meters, and apply the method of promoting sweet potato to lead in the process of plowing. Soil active agent for cadmium absorption and accumulation, five different kinds of sweet potatoes collected were planted in the plowed soil, sweet potatoes and their leaf stems were harvested when the sweet potatoes were mature, and the root, stem and leaf parts of sweet potatoes were analyzed experimentally. For the content of lead and cadmium, calculate the average content of lead and cadmium in each sweet potato, and arrange them in descending order according to the average content of lead and cadmium, and s...

Embodiment 2

[0026] The experiment was carried out at the experimental site of Changzhou University. The contaminated soil of the experiment was taken from the contaminated site of a lead and cadmium enterprise in Changzhou City. The size of the experimental site was 2 meters × 2 meters × 0.6 meters. Garbage, the application thickness is 0.05 meters, the application of soil active agent to promote the absorption and accumulation of lead and cadmium in potatoes, plant five different kinds of potatoes collected, harvest when the potatoes are mature, and analyze the roots, stems and leaves of potatoes The content of lead and cadmium in the medium, calculate the average value of lead and cadmium in each kind of potato, arrange according to the order of the average value from large to small, screen out the top three potato varieties with excessive absorption and accumulation, and then plant in polluted soil to screen out The top three potato varieties for lead and cadmium absorption and accumula...

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Abstract

The invention relates to a method for repairing lead-cadmium contaminated soil. Household garbage obtained after aerobic composting treatment is applied to the contaminated soil to be repaired, and the contaminated soil to be repaired is ploughed; in the ploughing process, a soil active agent promoting sweet potatoes and potatoes to absorb and accumulate lead and cadmium is applied, and different kinds of sweet potatoes are planted; the content of the lead and cadmium in root blocks, stems and leaves of the sweet potatoes and the potatoes is harvested and analyzed, and the variety of the sweet potatoes and the potatoes which excessively absorb and accumulate the lead and cadmium is screened out; through screening, the variety of the sweet potatoes and the potatoes which excessively absorb and accumulate the lead and cadmium in an optimum manner and the soil active agent are obtained, the contaminated soil is repaired, the harvested sweet potatoes and potatoes serve as industrial raw materials, and meanwhile, the problems of treatment and disposal of the household garbage generated in the urban development process are partly solved.

Description

technical field [0001] The invention relates to the technical field of treatment of polluted soil, in particular to a method for repairing lead and cadmium polluted soil. Background technique [0002] In recent years, with the upgrading of the industrial structure and the acceleration of urbanization, almost all large and medium-sized cities in my country are facing the problem of closing and relocating a large number of polluting enterprises, resulting in a large number of leftover and abandoned industrial sites in the city. Among the sites left by the relocation Many of them have serious heavy metal lead and cadmium pollution. Lead and cadmium pollution not only inhibit the degradation of organic matter in soil, soil respiratory metabolism, soil ammonification and nitrification, but more seriously, lead and cadmium can also be transformed into more toxic metal-organic compounds, which are harmful to human health, The soil environment poses greater hazards. [0003] At pre...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 王莉万玉山
Owner CHANGZHOU UNIV