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Comprehensive repair method of heavy metal contaminated soil and application

A technology for polluted soil and remediation methods, applied in the field of environmental pollution control and new energy, can solve the problems of crop products with no obvious economic value, single heavy metal species, and low biomass of heavy metal hyperaccumulation plants, so as to avoid re-pollution and avoid The effect of secondary pollution and reduction of use

Inactive Publication Date: 2015-02-04
TSINGHUA UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0005] In order to solve the problems in the prior art that the biomass of heavy metal hyperaccumulating plants is low, the types of heavy metals absorbed are single, and crop products have no obvious economic value, the present invention provides a comprehensive restoration method for heavy metal-contaminated soil. The method is a method of comprehensive treatment of heavy metal polluted soil through energy crop planting and biofuel production ( figure 1 ), the technical scheme adopted is as follows:

Method used

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  • Comprehensive repair method of heavy metal contaminated soil and application
  • Comprehensive repair method of heavy metal contaminated soil and application

Examples

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Effect test

Embodiment 1

[0034] Example 1 Cadmium Polluted Soil Sweet Sorghum Pot Experiment

[0035] The ability of sweet sorghum to absorb heavy metal cadmium was investigated by pot planting method in Haikou City, Hainan Province. Two sweet sorghum varieties, Nengfei and Kaoli, were selected for the experiment, and the content of heavy metal cadmium in the soil was set at 6 mg / kg. There were two treatments in this experiment, and each treatment was repeated nine times.

[0036] The potting soil configuration method is as follows:

[0037] Take soil from normal farmland, pass it through a 5mm sieve, sieve out stones, grass roots, underground pests and other sundries, add about 15% of water to pile it up, and cover it with plastic cloth for 5-7 days to kill diseases, insects and sundries in the soil. Grass, spare. After 5-7 days, dry the soil in the sun and mix well to make the moisture and texture consistent. Fill the uniform soil according to 100 kg per pot. Weigh the heavy metal cadmium requi...

Embodiment 2

[0043]Example 2 Sweet sorghum planting experiment in cadmium-contaminated soil in field plots

[0044] In this example, the inventors designed six treatments of planting experiments with soil mix in the test field block, with three repetitions for each treatment. The area of ​​the unit plot is 300cm×40cm, and the experimental soil of the plot is covered with plastic sheets to avoid the loss of heavy metal elements in the soil due to irrigation. The Cd concentrations in the six treatments were 0, 3, 6, 12, 24, 48 mg / kg respectively. Three sweet sorghum varieties, M12, M64 and M94, were planted on demand in each plot. The planting period was 90 days, and the plant height was measured at the expiration of the planting period.

[0045] After the planting period expired, the plants were collected separately, and the roots, stems and leaves of the sample plants were separated, and the soil and dirt on the surface were washed away with tap water, then fully rinsed with deionized wa...

Embodiment 3

[0049] Example 3 Field experiment on the ability of sweet sorghum to absorb heavy metal pollutants in soil

[0050] In Hainan Province, farmlands polluted to varying degrees were selected as experimental fields, one of which was land polluted with high concentrations of cadmium (cadmium content was 15 times higher than the standard for soil environmental quality grade III), with an area of ​​0.5 mu; the other was land polluted with low concentrations of cadmium (The cadmium content is 6 times higher than the soil environmental quality level II standard), with an area of ​​0.5 mu. One season of sweet sorghum was planted on two plots of land respectively, and the contents of various heavy metals in the stalks, leaves and ears of sweet sorghum were measured after harvest. At the same time, the same variety of sweet sorghum was also planted in uncontaminated land as a blank control. The results are shown in Tables 3 and 4 below.

[0051] Table 3. Experimental results of absorpti...

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Abstract

The invention discloses a comprehensive repair method of heavy metal contaminated soil and application, and belongs to the technical field of environmental pollution control and new energy. The method provided by the invention comprises the following steps: cultivating sorgos on the heavy metal contaminated soil to absorb heavy metals via the sorgos, harvesting the sorgos after the sorgos are ripe, crushing the sorgo straws, performing solid fermentation, distilling to recycle ethanol in the fermentation product after fermentation, primarily drying the distillation residues, combined firing the distillation residues with crop roots and leaves, and recycling and treating the heavy metals in the ash. The method provided by the invention has the advantages of high crop biomass and high heavy metal absorption efficiency, meanwhile, the produced straws can be used for fermenting to produce biofuel, such secondary pollutants as biogas slurry and biogas residue can not be produced after fermentation, thus the environmental benefits are good; ears of sorghum can be used for producing a culture medium or used as a feed, thus having huge social benefit and economic benefit and being suitable for industrial promotion.

Description

technical field [0001] The invention relates to a comprehensive restoration method and application of heavy metal-contaminated soil, in particular to a restoration method for heavy metal-cadmium-contaminated soil, which belongs to the technical fields of environmental pollution control and new energy. Background technique [0002] Due to pollution caused by mining, metallurgy, chemical industry and other industries, the cultivated land area polluted by heavy metals in my country has reached 20 million hectares, accounting for 1 / 6 of the total cultivated land area in the country. Among them, cadmium pollution is the most serious, and the prevention and control situation is very severe. showing an increasing trend. Compared with other major heavy metal pollutants, cadmium is more easily adsorbed by crops. Because of its strong biological toxicity, it causes serious food safety hazards. Cadmium pollution sources are mainly lead-zinc mines, non-ferrous metal smelting, electropl...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): B09C1/00
Inventor 李十中李纪红范桂芳李光明
Owner TSINGHUA UNIV
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