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Technique for reducing content of cadmium and lead in soil

A lead content and soil technology, which is applied in the field of heavy metal-contaminated soil treatment, can solve problems such as restricting sustainable development and problems of excess sludge treatment and disposal, and achieves the effects of low cost, convenient operation and low investment.

Inactive Publication Date: 2014-07-09
CHANGZHOU UNIV
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Problems solved by technology

[0003] At the same time, due to the rapid development of my country's economy, the amount of sewage discharge continues to expand, and the government's environmental protection efforts are also continuously strengthened. The treatment and disposal of excess sludge produced by sewage treatment plants has become increasingly difficult, which has become a constraint for the sustainable development of the entire sewage treatment industry. Bottleneck problem

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0025] A chemical pollution site next to Zhongwu Avenue in Changzhou City, Jiangsu Province was analyzed to have a soil pollution depth of 2 meters, and plans to repair it in three stages. Apply the dehydrated residual sludge near the domestic sewage treatment plant on the polluted site with a thickness of 0.05 meters. Plow the polluted site to be repaired. The depth of each plow is 0.7 meters. Amaranth is a soil accelerator for cadmium and lead absorption and accumulation. Nine different species of amaranth collected in southern Jiangsu are planted in the soil after plowing. When the amaranth grows to 0.2 meters, the mature leaves of the lower part and part of the upper part of the amaranth are harvested. Stems: Experimentally analyze the cadmium content in the stems and leaves of amaranth, calculate the average cadmium content of each kind of amaranth, arrange them in descending order according to the average cadmium content, and screen out the top three amaranths that absorb...

Embodiment 2

[0027] The experiment was carried out at the experimental site of Changzhou University. The contaminated soil of the experiment was taken from the chemical pollution site next to Zhongwu Avenue. The size of the experimental site was 3 meters × 2 meters × 0.5 meters. The dehydrated residual sludge from the domestic sewage treatment plant was used on the site , the application thickness is 0.05 meters, and the soil accelerator that promotes the absorption and accumulation of cadmium and lead by amaranth is applied, and nine different kinds of amaranth collected in southern Jiangsu are planted. When the amaranth grows to 0.2 meters, the lower mature leaves and Part of the upper stem, the sum of cadmium and lead content in the stems and leaves of amaranth was analyzed experimentally, and the average value of the sum of cadmium and lead content in each amaranth was calculated, and the average value was arranged in order from large to small, and the super The top three amaranth varie...

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Abstract

The invention relates to a technique for reducing the content of cadmium and lead in soil. Dewatered residual sludge of a domestic sewage treatment plant is applied to a to-be-repaired pollution site, the to-be-repaired pollution site is turned over, a soil promoter for promoting cadmium and lead absorption and accumulation of edible amaranth is applied in the turn-over process, different types of edible amaranth are planted, the edible amaranth is reaped, and the content of cadmium and lead in stems and leaves of the edible amaranth is analyzed so as to screen out the edible amaranth with excessive absorption and maximal accumulation on cadmium and lead. The edible amaranth with excessive absorption and maximal accumulation on cadmium and lead and the promoter are obtained in a screening manner and are used for repairing the polluted industrial site, the repaired industrial site can be used as a construction land, a land for greening and a part of non-edible farmland, and meanwhile, the problems of treatment and disposal of the residual sludge generated by the sewage treatment plant are partially solved.

Description

technical field [0001] The invention relates to the technical field of treatment of heavy metal polluted soil, in particular to a technology for reducing the content of cadmium and lead in 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 cadmium and lead pollution. Cadmium and lead pollution not only inhibit the degradation of organic matter in soil, soil respiratory metabolism, soil ammonification and nitrification, but more seriously, cadmium and lead can also be transformed into more toxic metal-organic compounds, which are harmful to human health. , The soil environment will cause gr...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 万玉山黄利李定龙杨彦
Owner CHANGZHOU UNIV
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